Dr. William C. Danchi Profile

Dr. William C. Danchi

Senior Astrophysicist at NASA Goddard Space Flight Ctr

SPIE Involvement:

Author

Publications (54)

Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

MATISSE, the VLTI mid-infrared imaging spectro-interferometer at the time of the first published astrophysical results

Stéphane Lagarde, Anthony Meilland, Bruno Lopez, Romain Petrov, Fatmé Allouche, Alexis Matter, Jean-Charles Augereau, Phillippe Berio, Felix Bettonvil, Roy van Boekel, Paul Bristow, Pierre Cruzalèbes, William Danchi, Andreas Glindemann, Massinissa Hadjara, Mathias Henninger, Michiel Hogerheijde, Walter Jaffe, James Leftley, Michael Lehmitz, Florentin Millour, Claudia Paladini, Eric Pantin, Miguel Riquelme, Thomas Rivinius, Sylvie Robbe-Dubois, Markus Schoeller, Jozsef Varga, Gerd Weigelt, Julien Woillez, Gérard Zins

Proceedings Volume 12183, 121830A (2022) https://doi.org/10.1117/12.2630164

KEYWORDS: Stars, Mid-IR, Spectral resolution, Telescopes, Visibility, Sensors, Observatories, Atmospheric optics, Astatine, Planets

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Proceedings Article | 13 December 2020 Paper

Paper

Review and scientific prospects of high-contrast optical stellar interferometry

D. Defrère, O. Absil, J.-P. Berger, W. C. Danchi, C. Dandumont, F. Eisenhauer, S. Ertel, T. Gardner, A. Glauser, P. Hinz, M. Ireland, J. Kammerer, S. Kraus, L. Labadie, S. Lacour, R. Laugier, J. Loicq, G. Martin, F. Martinache, M. A. Martinod, B. Mennesson, J. Monnier, B. Norris, M. Nowak, J. U. Pott, S. Quanz, E. Serabyn, J. Stone, P. Tuthill, J. Woillez

Proceedings Volume 11446, 114461J (2020) https://doi.org/10.1117/12.2561505

KEYWORDS: Stellar interferometry, Interferometry, Nulling interferometry, Data acquisition, Stars, Adaptive optics, Integrated optics, Calibration, Large telescopes

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Proceedings Article | 12 July 2019 Open Access

Open Access

Paper

European and US technologies enable CETUS: an ultraviolet space telescope concept

Tony Hull, Sara Heap, Bill Danchi, Bob Woodruff, Steve Kendrick, Lloyd Purves

Proceedings Volume 11180, 1118075 (2019) https://doi.org/10.1117/12.2536176

KEYWORDS: Galactic astronomy, Spectrographs, Ultraviolet radiation, Space telescopes, Telescopes, Spectroscopy, Stars, Cameras, Astronomical imaging, Mirrors

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SPIE Journal Paper | 3 May 2019 Open Access

Open Access

Optical design for CETUS: a wide-field 1.5-m aperture UV payload being studied for a NASA probe class mission study

Robert Woodruff, William Danchi, Sara Heap, Tony Hull, Stephen Kendrick, Lloyd Purves, Michael Rhee, Eric Mentzell, Brian Fleming, Marty Valente, James Burge, Ben Lewis, Kelly Dodson, Greg Mehle, Matt Tomic

JATIS, Vol. 5, Issue 02, 024006, (May 2019) https://doi.org/10.1117/12.10.1117/1.JATIS.5.2.024006

KEYWORDS: Mirrors, Content addressable memory, Molybdenum, Sensors, Image quality, Optical design, Spectrographs, Optical alignment, Spectral resolution, Silicon

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Proceedings Article | 24 July 2018 Presentation + Paper

Presentation + Paper

The HOSTS survey for exo-zodiacal dust: preliminary results and future prospects

S. Ertel, G. Kennedy, D. Defrère, P. Hinz, A. Shannon, B. Mennesson, W. C. Danchi, C. Gelino, J. M. Hill, W. Hoffman, G. Rieke, E. Spalding, J. Stone, A. Vaz, A. Weinberger, P. Willems, O. Absil, P. Arbo, V. Bailey, C. Beichman, G. Bryden, E. Downey, O. Durney, S. Esposito, A. Gaspar, P. Grenz, C. Haniff, J. Leisenring, L. Marion, T. McMahon, R. Millan-Gabet, M. Montoya, K. Morzinski, E. Pinna, J. Power, A. Puglisi, A. Roberge, E. Serabyn, A. Skemer, K. Stapelfeldt, K. Y. L. Su, V. Vaitheeswaran, M. Wyatt

Proceedings Volume 10698, 106981V (2018) https://doi.org/10.1117/12.2313685

KEYWORDS: Stars, Planets, Calibration, Statistical analysis, Exoplanets, Space telescopes, Nulling interferometry, Astronomy, Telescopes, Interferometry

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The presence of large amounts of dust in the habitable zones of nearby stars is a significant obstacle for future exo-Earth imaging missions. We executed the HOSTS (Hunt for Observable Signatures of Terrestrial Systems) survey to determine the typical amount of such exozodiacal dust around a sample of nearby main sequence stars. The majority of the data have been analyzed and we present here an update of our ongoing work. Nulling interferometry in N band was used to suppress the bright stellar light and to detect faint, extended circumstellar dust emission. We present an overview of the latest results from our ongoing work. We find seven new N band excesses in addition to the high confidence confirmation of three that were previously known. We find the first detections around Sun-like stars and around stars without previously known circumstellar dust. Our overall detection rate is 23%. The inferred occurrence rate is comparable for early type and Sun-like stars, but decreases from 71^{+11 -20}% for stars with previously detected mid- to far-infrared excess to 11^{+9 -4}% for stars without such excess, confirming earlier results at high confidence. For completed observations on individual stars, our sensitivity is five to ten times better than previous results. Assuming a lognormal luminosity function of the dust, we find upper limits on the median dust level around all stars without previously known mid to far infrared excess of 11.5 zodis at 95% confidence level. The corresponding upper limit for Sun-like stars is 16 zodis. An LBTI vetted target list of Sun-like stars for exo-Earth imaging would have a corresponding limit of 7.5 zodis. We provide important new insights into the occurrence rate and typical levels of habitable zone dust around main sequence stars. Exploiting the full range of capabilities of the LBTI provides a critical opportunity for the detailed characterization of a sample of exozodiacal dust disks to understand the origin, distribution, and properties of the dust.

Proceedings Article | 9 July 2018 Paper

Paper

Hi-5: a potential high-contrast thermal near-infrared imager for the VLTI

D. Defrère, M. Ireland, O. Absil, J.-P. Berger, W. Danchi, S. Ertel, A. Gallenne, F. Hénault, P. Hinz, E. Huby, S. Kraus, L. Labadie, J.-B. Le Bouquin, G. Martin, A. Matter, B. Mennesson, A. Mérand, S. Minardi, J. Monnier, B. Norris, G. Orban de Xivry, E. Pedretti, J.-U. Pott, M. Reggiani, E. Serabyn, J. Surdej, K. R. W. Tristram, J. Woillez

Proceedings Volume 10701, 107010U (2018) https://doi.org/10.1117/12.2313700

KEYWORDS: Planets, Interferometry, Stars, Exoplanets, Imaging systems, Interferometers, L band, Mid-IR, Integrated optics, Astrophysics

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Proceedings Article | 6 July 2018 Paper

Paper

UV capabilities of the CETUS multi-object spectrometer (MOS) and NUV/FUV camera

Stephen Kendrick, Robert Woodruff, Tony Hull, Sara Heap, Alexander Kutyrev, William Danchi, Lloyd Purves

Proceedings Volume 10699, 1069939 (2018) https://doi.org/10.1117/12.2314114

KEYWORDS: Cameras, Galactic astronomy, Ultraviolet radiation, Optical filters, Charge-coupled devices, CCD image sensors, Carbon nanotubes, Astronomical spectrometers

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Proceedings Article | 5 September 2017 Paper

Paper

Optical design for CETUS: a wide-field 1.5m aperture UV payload being studied for a NASA probe class mission study

Robert Woodruff, Tony Hull, Sara Heap, William Danchi, Stephen Kendrick, Lloyd Purves

Proceedings Volume 10401, 104011P (2017) https://doi.org/10.1117/12.2286680

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Proceedings Article | 5 September 2017 Presentation + Paper

Presentation + Paper

Multiplexing in astrophysics with a UV multi-object spectrometer on CETUS, a probe-class mission study

Stephen Kendrick, Robert Woodruff, Tony Hull, Sara Heap, Alexander Kutyrev, William Danchi, Lloyd Purves

Proceedings Volume 10401, 1040111 (2017) https://doi.org/10.1117/12.2286681

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Proceedings Article | 5 September 2017 Presentation + Paper

Presentation + Paper

The NASA probe-class mission concept, CETUS (Cosmic Evolution Through Ultraviolet Spectroscopy)

Sara Heap, William Danchi, James Burge, Kelly Dodson, Anthony Hull, Steven Kendrick, Stephan McCandliss, Gregory Mehle, Lloyd Purves, David Sheikh, Martin Valente, Robert Woodruff

Proceedings Volume 10398, 103980U (2017) https://doi.org/10.1117/12.2274202

KEYWORDS: Space telescopes, Telescopes, Ultraviolet radiation, Spectrographs, Imaging spectroscopy, Ultraviolet telescopes, Astronomical imaging, Cameras, Optical instrument design, UV-Vis spectroscopy

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Proceedings Article | 8 August 2016 Paper

Paper

Enabling the direct detection of earth-sized exoplanets with the LBTI HOSTS project: a progress report

W. Danchi, V. Bailey, G. Bryden, D. Defrère, S. Ertel, C. Haniff, P. Hinz, G. Kennedy, B. Mennesson, R. Millan-Gabet, G. Rieke, A. Roberge, E. Serabyn, A. Skemer, K. Stapelfeldt, A. Weinberger, M. Wyatt, A. Vaz

Proceedings Volume 9907, 990713 (2016) https://doi.org/10.1117/12.2233397

KEYWORDS: Exoplanets, Stars, Telescopes, Interferometers, Mid-IR, Nulling interferometry, Planets, Solar system, Space telescopes, Coronagraphy

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NASA has funded a project called the Hunt for Observable Signatures of Terrestrial Systems (HOSTS) to survey nearby solar type stars to determine the amount of warm zodiacal dust in their habitable zones. The goal is not only to determine the luminosity distribution function but also to know which individual stars have the least amount of zodiacal dust. It is important to have this information for future missions that directly image exoplanets as this dust is the main source of astrophysical noise for them. The HOSTS project utilizes the Large Binocular Telescope Interferometer (LBTI), which consists of two 8.4-m apertures separated by a 14.4-m baseline on Mt. Graham, Arizona. The LBTI operates in a nulling mode in the mid-infrared spectral window (8-13 μm), in which light from the two telescopes is coherently combined with a 180 degree phase shift between them, producing a dark fringe at the location of the target star. In doing so the starlight is greatly reduced, increasing the contrast, analogous to a coronagraph operating at shorter wavelengths. The LBTI is a unique instrument, having only three warm reflections before the starlight reaches cold mirrors, giving it the best photometric sensitivity of any interferometer operating in the mid-infrared. It also has a superb Adaptive Optics (AO) system giving it Strehl ratios greater than 98% at 10 μm. In 2014 into early 2015 LBTI was undergoing commissioning. The HOSTS project team passed its Operational Readiness Review (ORR) in April 2015. The team recently published papers on the target sample, modeling of the nulled disk images, and initial results such as the detection of warm dust around η Corvi. Recently a paper was published on the data pipeline and on-sky performance. An additional paper is in preparation on β Leo. We will discuss the scientific and programmatic context for the LBTI project, and we will report recent progress, new results, and plans for the science verification phase that started in February 2016, and for the survey.

Proceedings Article | 4 August 2016 Paper

Paper

An overview of the mid-infrared spectro-interferometer MATISSE: science, concept, and current status

A. Matter, B. Lopez, P. Antonelli, M. Lehmitz, F. Bettonvil, U. Beckmann, S. Lagarde, W. Jaffe, R. Petrov, P. Berio, F. Millour, S. Robbe-Dubois, A. Glindemann, P. Bristow, M. Schoeller, T. Lanz, T. Henning, G. Weigelt, M. Heininger, S. Morel, P. Cruzalebes, K. Meisenheimer, R. Hofferbert, S. Wolf, Y. Bresson, T. Agocs, F. Allouche, J.-C. Augereau, G. Avila, C. Bailet, J. Behrend, G. van Belle, J.-P. Berger, R. van Boekel, P. Bourget, R. Brast, J.-M. Clausse, C. Connot, R. Conzelmann, G. Csepany, W. Danchi, M. Delbo, C. Dominik, A. van Duin, E. Elswijk, Y. Fantei, G. Finger, A. Gabasch, F. Gonté, U. Graser, F. Guitton, S. Guniat, M. De Haan, P. Haguenauer, H. Hanenburg, K.-H. Hofmann, M. Hogerheijde, R. ter Horst, J. Hron, C Hummel, J. Isderda, D. Ives, G. Jakob, A. Jasko, P. Jolley, S. Kiraly, J. Kragt, T. Kroener, G. Kroes, S. Kuindersma, L. Labadie, W. Laun, C. Leinert, J.-L. Lizon, C. Lucuix, A. Marcotto, F. Martinache, G. Martinot-Lagarde, N. Mauclert, L. Mehrgan, A. Meilland, M. Mellein, S. Menardi, A. Merand, U. Neumann, E. Nussbaum, S. Ottogalli, R. Palsa, J. Panduro, E. Pantin, I. Percheron, T. Phan Duc, J.-U. Pott, E. Pozna, R. Roelfsema, G. Rupprecht, D. Schertl, C. Schmidt, M. Schuil, A. Spang, J. Stegmeier, N. Tromp, F. Vakili, M. Vannier, K. Wagner, L. Venema, J. Woillez

Proceedings Volume 9907, 99070A (2016) https://doi.org/10.1117/12.2233052

KEYWORDS: Mid-IR, Interferometry, Telescopes, Signal detection, Sensors, Stars, Spectral resolution, Fourier transforms, L band, Cameras

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Proceedings Article | 4 August 2016 Paper

Paper

Simultaneous water vapor and dry air optical path length measurements and compensation with the large binocular telescope interferometer

D. Defrère, P. Hinz, E. Downey, M. Böhm, W. Danchi, O. Durney, S. Ertel, J. Hill, W. Hoffmann, B. Mennesson, R. Millan-Gabet, M. Montoya, J.-U. Pott, A. Skemer, E. Spalding, J. Stone, A. Vaz

Proceedings Volume 9907, 99071G (2016) https://doi.org/10.1117/12.2233884

KEYWORDS: Water, Optical testing, Interferometers, Infrared radiation, Telescopes, Interferometry, Phase measurement, K band, Nulling interferometry, Sensors

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Proceedings Article | 4 August 2016 Paper

Paper

Making high-accuracy null depth measurements for the LBTI exozodi survey

Bertrand Mennesson, Denis Defrère, Matthias Nowak, Philip Hinz, Rafael Millan-Gabet, Olivier Absil, Vanessa Bailey, Geoffrey Bryden, William Danchi, Grant Kennedy, Lindsay Marion, Aki Roberge, Eugene Serabyn, Andy Skemer, Karl Stapelfeldt, Alycia Weinberger, Mark Wyatt

Proceedings Volume 9907, 99070X (2016) https://doi.org/10.1117/12.2231839

KEYWORDS: Interferometry, Mid-IR, Stars, Calibration, Visibility, Telescopes, Sensors, Astronomy, Signal detection, Error analysis

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Proceedings Article | 4 August 2016 Paper

Paper

Overview of LBTI: a multipurpose facility for high spatial resolution observations

P. Hinz, D. Defrère, A. Skemer, V. Bailey, J. Stone, E. Spalding, A. Vaz, E. Pinna, A. Puglisi, S. Esposito, M. Montoya, E. Downey, J. Leisenring, O. Durney, W. Hoffmann, J. Hill, R. Millan-Gabet, B. Mennesson, W. Danchi, K. Morzinski, P. Grenz, M. Skrutskie, S. Ertel

Proceedings Volume 9907, 990704 (2016) https://doi.org/10.1117/12.2233795

KEYWORDS: Nulling interferometry, Cameras, Spatial resolution, Adaptive optics, Telescopes, Interferometers, Mirrors, Stars, Sensors, Focus stacking software

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Proceedings Article | 24 July 2014 Paper

Paper

The LBTI hunt for observable signatures of terrestrial systems (HOSTS) survey: a key NASA science program on the road to exoplanet imaging missions

W. Danchi, V. Bailey, G. Bryden, D. Defrère, C. Haniff, P. Hinz, G. Kennedy, B. Mennesson, R. Millan-Gabet, G. Rieke, A. Roberge, E. Serabyn, A. Skemer, K. Stapelfeldt, A. Weinberger, M. Wyatt

Proceedings Volume 9146, 914607 (2014) https://doi.org/10.1117/12.2056681

KEYWORDS: Stars, Space telescopes, Planets, Solar system, Telescopes, Interferometers, Nulling interferometry, Imaging systems, Exoplanets, Sun

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Proceedings Article | 24 July 2014 Paper

Paper

Co-phasing the Large Binocular Telescope: status and performance of LBTI/PHASECam

D. Defrère, P. Hinz, E. Downey, D. Ashby, V. Bailey, G. Brusa , J. Christou, W. Danchi, P. Grenz, J. Hill, W. Hoffmann, J. Leisenring, J. Lozi, T. McMahon, B. Mennesson, R. Millan-Gabet, M. Montoya, K. Powell, A. Skemer, V. Vaitheeswaran, A. Vaz, C. Veillet

Proceedings Volume 9146, 914609 (2014) https://doi.org/10.1117/12.2057178

KEYWORDS: Telescopes, Mirrors, Phase measurement, Interferometry, Nulling interferometry, Sensors, Space telescopes, Interferometers, Infrared imaging, Exoplanets

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Proceedings Article | 24 July 2014 Paper

Paper

HD 139614: the interferometric case for a group-Ib pre-transitional young disk

Lucas Labadie, Alexis Matter, Alexander Kreplin, Bruno Lopez, Sebastian Wolf, Gerd Weigelt, Steve Ertel, Jean-Philippe Berger, Jorg-Uwe Pott, William Danchi

Proceedings Volume 9146, 91462T (2014) https://doi.org/10.1117/12.2055353

KEYWORDS: Visibility, Stars, Surface conduction electron emitter displays, Mid-IR, Interferometry, Data modeling, Radiative transfer, Silicates, Calibration, Infrared radiation

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Proceedings Article | 24 July 2014 Paper

Paper

MATISSE status report and science forecast

B. Lopez, S. Lagarde, W. Jaffe, R. Petrov, M. Schöller, P. Antonelli, U. Beckman, Ph. Bério, F. Bettonvil, U. Graser, F. Millour, S. Robbe-Dubois, L. Venema, S. Wolf, P. Bristow, A. Glindemann, J.-C. Gonzalez, Th. Lanz, T. Henning, G. Weigelt, T. Agócs, J.-C. Augereau, G. Ávila, C. Bailet, J. Behrend, J.-P. Berger, Roy von Boekel, S. Bonhomme, P. Bourget, R. Brast, Y. Bresson, J. Clausse, O. Chesneau, G. Csépány, C. Connot, A. Crida, W. Danchi, M. Delbo , F. Delplancke, C. Dominik, M. Dugué, E. Elswijk, Y. Fanteï, G. Finger, A. Gabasch, P. Girard, V. Girault, P. Gitton, A. Glazenborg, F. Gonté, F. Guitton, S. Guniat, M. De Haan, P. Haguenauer, H. Hanenburg, M. Heininger, K.-H. Hofmann, M. Hogerheijde, R. ter Horst, J. Hron, Y. Hughes, D. Ives, G. Jakob, A. Jaskó, P. Jolley, J. Kragt, R. Köhler, T. Kroener, G. Kroes, L. Labadie, W. Laun, M. Lehmitz, Ch. Leinert, J. Lizon, Ch. Lucuix, A. Marcotto, F. Martinache, A. Matter, G. Martinot-Lagarde, N. Mauclert, L. Mehrgan, A. Meilland, M. Mellein, S. Ménardi, J. Menut, K. Meisenheimer, S. Morel, L. Mosoni, R. Navarro, U. Neumann, E. Nussbaum, S. Ottogalli, R. Palsa, J. Panduro, E. Pantin, I. Percheron, T. Phan Duc, J.-U. Pott, Eszter Pozna, F. Przygodda, A. Richichi, F. Rigal, G. Rupprecht, D. Schertl, J. Stegmeier, L. Thiam, N. Tromp, M. Vannier, F. Vakili, G. van Belle, K. Wagner, J. Woillez

Proceedings Volume 9146, 91460M (2014) https://doi.org/10.1117/12.2056419

KEYWORDS: Interferometry, Sensors, Mid-IR, Stars, Telescopes, Visibility, Planets, Spectral resolution, Photometry, Fourier transforms

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Proceedings Article | 12 September 2012 Paper

Paper

Parasitic interference in classical and nulling stellar interferometry

A. Matter, D. Defrère, W. Danchi, B. Lopez, S. Lagarde, R. Petrov, M. Vannier

Proceedings Volume 8445, 84453J (2012) https://doi.org/10.1117/12.926456

KEYWORDS: Interferometers, Nulling interferometry, Signal to noise ratio, Interferometry, Planets, Telescopes, Contamination, Phase shifts, Stars, Stellar interferometry

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Proceedings Article | 22 July 2010 Paper

Paper

The Fourier-Kelvin Stellar Interferometer (FKSI) - infrared detection and characterization of exozodiacal dust to super-earths: a progress report

W. Danchi, R. Barry

Proceedings Volume 7734, 77340M (2010) https://doi.org/10.1117/12.858129

KEYWORDS: Space telescopes, Telescopes, Stars, James Webb Space Telescope, Exoplanets, Sensors, Interferometers, Infrared radiation, Infrared telescopes, Thermography

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Proceedings Article | 28 July 2008 Paper

Paper

First science with the Keck Interferometer Nuller: high spatial resolution N-band observations of the recurrent nova RS Ophiuchi

R. Barry, W. Danchi, W. Traub, M. Kuchner, J. Wisniewski, R. Akeson, M. Colavita, M. Greenhouse, C. Koresko, B. Mennesson, E. Serabyn, J. Sokoloski

Proceedings Volume 7013, 70130Q (2008) https://doi.org/10.1117/12.787085

KEYWORDS: Stars, Remote sensing, Nulling interferometry, Interferometers, Calibration, Data modeling, Radon, Spatial resolution, Silicates, Fringe analysis

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Proceedings Article | 28 July 2008 Paper

Paper

The Fourier-Kelvin Stellar Interferometer (FKSI): a review, progress report, and update

W. Danchi, R. Barry, P. Lawson, W. Traub, S. Unwin

Proceedings Volume 7013, 70132Q (2008) https://doi.org/10.1117/12.790649

KEYWORDS: Planets, Stars, Interferometers, Exoplanets, Nulling interferometry, Space telescopes, Telescopes, Infrared radiation, Sensors, James Webb Space Telescope

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Proceedings Article | 28 July 2008 Paper

Paper

MATISSE: perspective of imaging in the mid-infrared at the VLTI

B. Lopez, P. Antonelli, S. Wolf, S. Lagarde, W. Jaffe, R. Navarro, U. Graser, R. Petrov, G. Weigelt, Y. Bresson, K. Hofmann, U. Beckman, T. Henning, W. Laun, Ch. Leinert, S. Kraus, S. Robbe-Dubois, F. Vakili, A. Richichi, P. Abraham, J.-C. Augereau, J. Behrend, Ph. Berio, N. Berruyer, O. Chesneau, J. Clausse, C. Connot, K. Demyk, W. Danchi, M. Dugué, G. Finger, S. Flament, A. Glazenborg, H. Hannenburg, M. Heininger, Y. Hugues, J. Hron, S. Jankov, F. Kerschbaum, G. Kroes, H. Linz, J.-L. Lizon, Ph. Mathias, R. Mathar, A. Matter, J. Menut, K. Meisenheimer, F. Millour, N. Nardetto, U. Neumann, E. Nussbaum, A. Niedzielski, L. Mosoni, J. Olofsson, Y. Rabbia, T. Ratzka, F. Rigal, A. Roussel, D. Schertl, F.-X. Schmider, B. Stecklum, E. Thiebaut, M. Vannier, B. Valat, K. Wagner, L. B. F. M. Waters

Proceedings Volume 7013, 70132B (2008) https://doi.org/10.1117/12.789412

KEYWORDS: Mid-IR, Planets, Stars, Interferometry, Spectral resolution, Spectroscopy, Mirrors, Telescopes, Sensors, Observatories

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Proceedings Article | 28 July 2008 Paper

Paper

Terrestrial Planet Finder Interferometer: 2007-2008 progress and plans

P. Lawson, O. Lay, S. Martin, R. Peters, R. Gappinger, A. Ksendzov, D. Scharf, A. Booth, C. Beichman, E. Serabyn, K. Johnston, W. Danchi

Proceedings Volume 7013, 70132N (2008) https://doi.org/10.1117/12.786822

KEYWORDS: Nulling interferometry, Planets, Mid-IR, Robots, Interferometers, Stars, Spatial filters, Interferometry, Space operations, Signal detection

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Proceedings Article | 19 September 2007 Paper

Paper

Terrestrial planet finder interferometer: 2006-2007 progress and plans

P. Lawson, O. Lay, S. Martin, C. Beichman, K. Johnston, W. Danchi, R. Gappinger, S. Hunyadi, A. Ksendzov, B. Mennesson, R. Peters, D. Scharf, E. Serabyn, S. Unwin

Proceedings Volume 6693, 669308 (2007) https://doi.org/10.1117/12.734914

KEYWORDS: Planets, Nulling interferometry, Interferometers, Stars, Mid-IR, Spatial resolution, Interferometry, Space operations, Robots, Astrophysics

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Proceedings Article | 6 July 2006 Paper

Paper

The Fourier-Kelvin Stellar Interferometer: a low-complexity low-cost space mission for high-resolution astronomy and direct exoplanet detection

R. Barry, W. Danchi, L. Deming, L. Richardson, M. Kuchner, S. Seager, B. Frey, A. Martino, K. Lee, M. Zuray, J. Rajagopal, T. Hyde, R. Millan-Gabete, J. Monnier, R. Allen, W. Traub

Proceedings Volume 6265, 62651L (2006) https://doi.org/10.1117/12.672437

KEYWORDS: Sensors, Planets, Wavefronts, Interferometers, Control systems, Beam splitters, Space operations, Actuators, Astronomy, Signal detection

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Proceedings Article | 28 June 2006 Paper

Paper

Scientific rationale for exoplanet characterization from 3-8 microns: the FKSI mission

W. Danchi, R. Barry, D. Deming, M. Kuchner, J. Monnier, L. Mundy, J. Rajagopal, J. Richardson, S. Seager, W. Traub

Proceedings Volume 6268, 626820 (2006) https://doi.org/10.1117/12.672817

KEYWORDS: Planets, Exoplanets, Interferometers, Stars, Solar system, Jupiter, Clouds, Infrared radiation, Space telescopes, Signal to noise ratio

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Proceedings Article | 27 June 2006 Paper

Paper

MATISSE: perspective of imaging in the mid-infrared at the VLTI

B. Lopez, S. Wolf, S. Lagarde, P. Abraham, P. Antonelli, J. Augereau, U. Beckman, J. Behrend, N. Berruyer, Y. Bresson, O. Chesneau, J. Clausse, C. Connot, K. Demyk, W. Danchi, M. Dugué, S. Flament, A. Glazenborg, U. Graser, T. Henning, K. Hofmann, M. Heininger, Y. Hugues, W. Jaffe, S. Jankov, S. Kraus, W. Laun, Ch. Leinert, H. Linz, Ph. Mathias, K. Meisenheimer, A. Matter, J. Menut, F. Millour, U. Neumann, E. Nussbaum, A. Niedzielski, L. Mosonic, R. Petrov, T. Ratzka, S. Robbe-Dubois, A. Roussel, D. Schertl, F.-X. Schmider, B. Stecklum, E. Thiebaut, F. Vakili, K. Wagner, L. B. F. M. Waters, G. Weigelt

Proceedings Volume 6268, 62680Z (2006) https://doi.org/10.1117/12.671636

KEYWORDS: Mid-IR, Planets, Stars, Spectral resolution, Interferometry, Spectroscopy, Signal to noise ratio, Visibility, Spatial resolution, Sensors

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Proceedings Article | 13 June 2006 Paper

Paper

The Fourier-Kelvin Stellar Interferometer (FKSI) nulling testbed II: closed-loop path length metrology and control subsystem

B. Frey, R. Barry, W. Danchi, T. Hyde, K. Lee, A. Martino, M. Zuray

Proceedings Volume 6265, 62651N (2006) https://doi.org/10.1117/12.672467

KEYWORDS: Interferometers, Control systems, Sensors, Actuators, Metrology, Eye, Turbulence, Motion measurement, Detection and tracking algorithms, Signal detection

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Proceedings Article | 15 September 2005 Paper

Paper

The Fourier-Kelvin Stellar Interferometer (FKSI): a progress report and preliminary results from our nulling testbed

R. Barry, W. Danchi, V. Chambers, J. Rajagopal, L. Richardson, A. Martino, D. Deming, M. Kuchner, R. Linfield, R. Millan-Gabet, L. Lee, J. Monnier, L. Mundy, C. Noecker, S. Seager, D. Wallace, R. Allen, W. Traub, H. Ford

Proceedings Volume 5905, 59050Z (2005) https://doi.org/10.1117/12.627827

KEYWORDS: Beam splitters, Planets, Interferometers, Sensors, Stars, Wavefronts, Visibility, Nulling interferometry, Mirrors, Polarization

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Proceedings Article | 20 October 2004 Paper

Paper

The Stellar Imager (SI): a revolutionary large-baseline imaging interferometer at the Sun-Earth L2 point

Kenneth Carpenter, Carolus Schrijver, Ronald Allen, Alexander Brown, David Chenette, William Danchi, Margarita Karovska, Steven Kilston, Richard Lyon, Joe Marzouk, Lisa Mazzuca, Rud Moe, Frederick Walter, Neil Murphy

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.550572

KEYWORDS: Stars, Magnetism, Imaging systems, Sun, Solar processes, Ultraviolet radiation, Spatial resolution, Interferometry, Interferometers, Control systems

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Proceedings Article | 20 October 2004 Paper

Paper

The Fourier-Kelvin Stellar Interferometer: a practical interferometer for the detection and characterization of extrasolar giant planets

William Danchi, Ronald Allen, Dominic Benford, Drake Deming, Daniel Gezari, Marc Kuchner, David Leisawitz, Roger Linfield, Rafael Millan-Gabet, John Monnier, Lee Mundy, Charley Noecker, Jayadev Rajagopal, L. Richardson, Stephen Rinehart, Sara Seager, Wesley Traub, Debra Wallace

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.552077

KEYWORDS: Planets, Telescopes, Optical instrument design, Interferometers, Space telescopes, Stars, Nulling interferometry, Sensors, Cameras, Space operations

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Proceedings Article | 20 October 2004 Paper

Paper

Adaptive optics and aperture masking: a comparison

Jayadev Rajagopal, Richard Barry, Bruno Lopez, William Danchi, John Monnier, Peter Tuthill, Charles Townes

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.552170

KEYWORDS: Adaptive optics, Stars, Point spread functions, Calibration, Telescopes, Deconvolution, Space telescopes, Infrared imaging, Mirrors, Keck Observatory

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Proceedings Article | 16 September 2004 Paper

Paper

Requirements formulation and dynamic jitter analysis on Fourier-Kelvin stellar interferometer

T. Tupper Hyde, Kuo-Chia Liu, Carl Blaurock, Jeff Bolognese, Joseph Howard, William Danchi

Proceedings Volume 5497, (2004) https://doi.org/10.1117/12.552186

KEYWORDS: Optical isolators, Systems modeling, Integrated modeling, Sensors, Space operations, Geometrical optics, Interferometers, Nulling interferometry, Motion models, Wavefronts

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Proceedings Article | 24 February 2003 Paper

Paper

The Stellar Imager (SI) mission concept

Kenneth Carpenter, Carolus Schrijver, Richard Lyon, Lee Mundy, Ronald Allen, J. Thomas Armstrong, William Danchi, Margarita Karovska, Joseph Marzouk, Lisa Mazzuca, David Mozurkewich, Susan Neff, Thomas Pauls, Jayadev Rajagopal, Gregory Solyar, Xiaolei Zhang

Proceedings Volume 4854, (2003) https://doi.org/10.1117/12.459776

KEYWORDS: Stars, Magnetism, Imaging systems, Interferometers, Mirrors, Space telescopes, Interferometry, Planets, Image resolution, Ultraviolet radiation

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Proceedings Article | 21 February 2003 Paper

Paper

Stardust in stellar births, deaths, and binaries

Peter Tuthill, John Monnier, William Danchi

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.458188

KEYWORDS: Stars, Interferometry, Telescopes, Imaging systems, Binary data, Interfaces, Astronomy, Image processing, Spatial resolution, Image resolution

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Proceedings Article | 21 February 2003 Paper

Paper

Aperture synthesis using multiple facilities: Keck aperture masking and the IOTA interferometer

John Monnier, Rafael Millan-Gabet, Peter Tuthill, Wesley Traub, Nathaniel Carleton, Vincent Coude du Foresto, William Danchi, Marc Lacasse, Sebastien Morel, Guy Perrin, Irene Porro

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.459694

KEYWORDS: Visibility, Interferometers, Calibration, Image restoration, Synthetic apertures, Microelectromechanical systems, Stars, Interferometry, Astronomical imaging, Astronomy

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Proceedings Article | 21 February 2003 Paper

Paper

Status and progress on the upgraded infrared spatial interferometer

William Danchi, Charles Townes, Walter Fitelson, David Hale, John Monnier, Samuel Tevosjan, Jonathon Weiner

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.459774

KEYWORDS: Telescopes, Stars, Mid-IR, Visibility, Space telescopes, Interferometry, Interferometers, Signal detection, Sensors, Infrared radiation

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Proceedings Article | 21 February 2003 Paper

Paper

Recent science results from the two-telescope IOTA

Rafael Millan-Gabet, Ettore Pedretti, John Monnier, Wesley Traub, F. Peter Schloerb, Nathaniel Carleton, Sam Ragland, Marc Lacasse, William Danchi, Peter Tuthill, Guy Perrin, Vincent Coude du Foresto

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.459687

KEYWORDS: Visibility, Stars, Data modeling, Calibration, Content addressable memory, Infrared radiation, Atmospheric modeling, X-rays, Carbon, Interferometers

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Proceedings Article | 28 July 2000 Paper

Paper

Scientific motivation and technology requirements for the SPIRIT and SPECS far-infrared/submillimeter space interferometers

David Leisawitz, William Danchi, Michael DiPirro, Lee Feinberg, Daniel Gezari, Mike Hagopian, William Langer, John Mather, Samuel Moseley, Michael Shao, Robert Silverberg, Johannes Staguhn, Mark Swain, Harold Yorke, Xiaolei Zhang

Proceedings Volume 4013, (2000) https://doi.org/10.1117/12.393957

KEYWORDS: Space telescopes, Galactic astronomy, Interferometers, Telescopes, Mirrors, Spatial resolution, Stars, Interferometry, Sensors, Far infrared

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Proceedings Article | 5 July 2000 Paper

Paper

Combining high spectral and spatial resolution in the mid-infrared

John Monnier, William Danchi, David Hale, Peter Tuthill, Charles Townes

Proceedings Volume 4006, (2000) https://doi.org/10.1117/12.390255

KEYWORDS: Signal to noise ratio, Heterodyning, Optical filters, Telescopes, Bandpass filters, Calibration, Sensors, Electronic filtering, Mid-IR, Infrared radiation

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Proceedings Article | 5 July 2000 Paper

Paper

Space-based interferometric telescopes for the far infrared

Michael Shao, William Danchi, Michael DiPirro, Mark Dragovan, Lee Feinberg, Mike Hagopian, William Langer, Charles Lawrence, Peter Lawson, David Leisawitz, John Mather, Samuel Moseley, Mark Swain, Harold Yorke, Xiaolei Zhang

Proceedings Volume 4006, (2000) https://doi.org/10.1117/12.390278

KEYWORDS: Sensors, Mirrors, Space telescopes, Interferometers, Telescopes, Stars, Cryogenics, Interferometry, Infrared telescopes, Far infrared

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Proceedings Article | 5 July 2000 Paper

Paper

Aperture masking interferometry on the Keck I Telescope: new results from the diffraction limit

Peter Tuthill, John Monnier, William Danchi

Proceedings Volume 4006, (2000) https://doi.org/10.1117/12.390244

KEYWORDS: Stars, Space telescopes, Telescopes, Interferometry, Visibility, Mirrors, Ions, Diffraction, Astronomy, Spatial resolution

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Proceedings Article | 21 August 1998 Paper

Paper

Long-wavelength infrared camera (LWIRC): a 10 micron camera for the Keck telescope

Edward Wishnow, William Danchi, Peter Tuthill, Ronald Wurtz, J. Jernigan, John Arens

Proceedings Volume 3354, (1998) https://doi.org/10.1117/12.317285

KEYWORDS: Cameras, Telescopes, Optical filters, Space telescopes, Staring arrays, Digital signal processing, Electronics, Liquids, Helium, Long wavelength infrared

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Proceedings Article | 24 July 1998 Paper

Paper

Near-infrared guiding and tip-tilt correction for the UC Berkeley Infrared Spatial Interferometer

Everett Lipman, Manfred Bester, William Danchi, Charles Townes

Proceedings Volume 3350, (1998) https://doi.org/10.1117/12.317160

KEYWORDS: Telescopes, Stars, Infrared radiation, Sensors, Cameras, Infrared telescopes, Imaging systems, Signal detection, Mirrors, Interferometers

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Proceedings Article | 24 July 1998 Paper

Paper

Michelson interferometry with Keck I

Peter Tuthill, John Monnier, William Danchi, Christopher Haniff

Proceedings Volume 3350, (1998) https://doi.org/10.1117/12.317120

KEYWORDS: Stars, Telescopes, Visibility, Interferometry, Space telescopes, Calibration, Data modeling, Signal to noise ratio, Infrared imaging, Infrared radiation

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Proceedings Article | 24 July 1998 Open Access

Open Access

Paper

Infrared Spatial Interferometer

Charles Townes, Manfred Bester, William Danchi, David Hale, John Monnier, Everett Lipman, Peter Tuthill, Mark Johnson, Donald Walters

Proceedings Volume 3350, (1998) https://doi.org/10.1117/12.317159

KEYWORDS: Stars, Telescopes, Visibility, Interferometry, Spatial frequencies, Infrared radiation, Heterodyning, Interferometers, Visible radiation, Space telescopes

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Proceedings Article | 9 June 1994 Paper

Paper

Analysis of visibility data from the University of California/Berkeley Infrared Spatial Interferometer: radiative transfer modeling and results on fifteen stars

William Danchi, Manfred Bester, Lincoln Greenhill, Cuno Degiacomi, Charles Townes

Proceedings Volume 2200, (1994) https://doi.org/10.1117/12.177247

KEYWORDS: Data modeling, Stars, Visibility, Spatial frequencies, Radiative transfer, Carbon, Interferometers, Telescopes, Information operations, Silicates

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Proceedings Article | 9 June 1994 Paper

Paper

Circumstellar envelope of VX Sgr resolved with long-baseline interferometry at millimeter and midinfrared wavelengths

Lincoln Greenhill, James Moran, Donald Backer, Manfred Bester, William Danchi

Proceedings Volume 2200, (1994) https://doi.org/10.1117/12.177248

KEYWORDS: Stars, Calibration, Interferometry, Visibility, Infrared radiation, Signal to noise ratio, Observatories, Clocks, Mid-IR, Spatial resolution

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We report VLBI observations at 7-mm wavelengths of the SiO maser emission in the circumstellar envelope of the late-type, supergiant variable star VX Sagitarius. Synthesis images, the first ever made of the SiO emission from VX Sgr, show that the maser emission at a stellar phase of about 0.4, arises in a ringlike distribution with a radius of about 1.3 R_*. The distribution of emission around the limb is asymmetric, as is the spectrum of emission with respect to the stellar systemic velocity. The strongest emission arises from a redshifted center of activity that lies to the south of the star and may indicate an asymmetry in the stellar atmosphere or in the mass loss. The maser emission within 4 km s^-1 of the stellar velocity is distributed along the limb and does not show evidence of systematic velocity gradients greater than a few km s^-1. However, there may be evidence of acceleration of material away from the star, where outflow velocities increase from about 10 km s^-1 at 1.3 R_* to at least 20 km s^-1 in the OH and H₂O maser shells at radii of about 30 R_*. The arrangement of the maser emission supports a model having dense velocity coherent structures with characteristic sizes of approximately 0.5 AU in the extended stellar atmosphere. However, a substantial fraction of the maser flux density has been resolved by these observations, as with earlier VLBI observations of at least three times more coarse angular resolution. We speculate that the circumstellar shell has velocity coherent cells on spatial scales of approximately 0.5 to perhaps 100 AU, which give rise to SiO maser emission. The SiO maser emission lies well within the 4.6 R_* inner radius of the surrounding dust shell, as measured with the U. C. Berkeley infrared interferometer. The high angular resolution infrared and millimeter observation were made at similar phases during the same cycle, and thus provide strong evidence that the SiO maser emission arises well away from the dust-rich region of the circumstellar envelope.

Proceedings Article | 9 June 1994 Paper

Paper

University of California/Berkeley Infrared Spatial Interferometer: recent system upgrades and analysis of atmospheric fluctuations

Manfred Bester, William Danchi, Cuno Degiacomi, Peter Bratt

Proceedings Volume 2200, (1994) https://doi.org/10.1117/12.177246

KEYWORDS: Telescopes, Infrared radiation, Sensors, Signal to noise ratio, Calibration, Visibility, Heterodyning, Stars, Interferometers, Optical filters

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Proceedings Article | 9 June 1994 Paper

Paper

Toward 10-milliarcsecond infrared astrometry

Robert Treuhaft, Stephen Lowe, Manfred Bester, William Danchi, Charles Townes

Proceedings Volume 2200, (1994) https://doi.org/10.1117/12.177249

KEYWORDS: Infrared radiation, Interferometry, Atmospheric modeling, Telescopes, Calibration, Data modeling, Infrared telescopes, Interferometers, Phase interferometry, Heterodyning

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Proceedings Article | 1 August 1990 Paper

Paper

Long-baseline interferometer for the mid-infrared

Manfred Bester, William Danchi, Charles Townes

Proceedings Volume 1237, (1990) https://doi.org/10.1117/12.19343

KEYWORDS: Telescopes, Interferometers, Mirrors, Space telescopes, Infrared radiation, Heterodyning, Laser systems engineering, Stars, Interferometry, Mid-IR

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Proceedings Article | 1 August 1990 Paper

Paper

Visibility curves at 10 um wavelength for stars with dust shells

William Danchi, Manfred Bester, Cuno Degiacomi, Peter McCullough, Charles Townes

Proceedings Volume 1237, (1990) https://doi.org/10.1117/12.19344

KEYWORDS: Visibility, Stars, Data modeling, Interferometers, Spatial frequencies, Infrared radiation, Heterodyning, Telescopes, Interferometry, Calibration

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Showing 5 of 54 publications

Proceedings Volume Editor (3)

SPIE Conference Volume | 23 July 2010

Optical and Infrared Interferometry II

SPIE Conference Volume | 14 July 2008

Optical and Infrared Interferometry

SPIE Conference Volume | 22 June 2006

Advances in Stellar Interferometry

Conference Committee Involvement (6)

Optical and Infrared Interferometry III

1 July 2012 | Amsterdam, Netherlands

Optical and Infrared Interferometry II

27 June 2010 | San Diego, California, United States

Optical and Infrared Interferometry

23 June 2008 | Marseille, France

Advances in Stellar Interferometry

25 May 2006 | Orlando, Florida , United States

Techniques and Instrumentation for Detection of Exoplanets II

2 August 2005 | San Diego, California, United States

Showing 5 of 6 Conference Committees

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