Dr. Daniel J. Mortimer Profile

Dr. Daniel J. Mortimer

Postdoctoral Research Fellow at Max-Planck Institute for Astronomy

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Author

Publications (11)

SPIE Journal Paper | 27 June 2023

High-angular resolution and high contrast observations from Y to L band at the Very Large Telescope Interferometer with the Asgard Instrumental suite

Marc-Antoine Martinod, Denis Defrère, Michael Ireland, Stefan Kraus, Frantz Martinache, Peter Tuthill, Azzurra Bigioli, Emilie Bouzerand, Julia Bryant, Sorabh Chhabra, Benjamin Courtney-Barrer, Fred Crous, Nick Cvetojevic, Colin Dandumont, Steve Ertel, Tyler Gardner, Germain Garreau, Adrian Glauser, Lucas Labadie, Tiphaine Lagadec, Romain Laugier, Alexandra Mazzoli, Daniel Mortimer, Barnaby R. Norris, Gert Raskin, Gordon Robertson, Ahmed Sanny, Adam Taras

JATIS, Vol. 9, Issue 02, 025007, (June 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.2.025007

KEYWORDS: Equipment, Stars, L band, Exoplanets, Astronomical interferometers, Nulling interferometry, Imaging systems, Spatial resolution, Planets, Planetary systems

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SPIE Journal Paper | 6 June 2023 Open Access

MYSTIC: a high angular resolution K-band imager at CHARA

Benjamin Setterholm, John Monnier, Jean-Baptiste Le Bouquin, Narsireddy Anugu, Jacob Ennis, Laurent Jocou, Nour Ibrahim, Stefan Kraus, Matthew Anderson, Sorabh Chhabra, Isabelle Codron, Christopher Farrington, Becky Flores, Tyler Gardner, Mayra Gutierrez, Cyprien Lanthermann, Olli W. Majoinen, Daniel Mortimer, Gail Schaefer, Nicholas Scott, Theo ten Brummelaar, Norman Vargas

JATIS, Vol. 9, Issue 02, 025006, (June 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.2.025006

KEYWORDS: Equipment, K band, Spatial resolution, Beam combiners, Cameras, Imaging systems, Prisms, Mirrors, Vacuum, Design and modelling

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Proceedings Article | 26 August 2022 Poster + Paper

Cryogenic performance of FOURIER, the initial science combiner at the MROI

Daniel Mortimer, David Buscher, Michelle Creech-Eakman, Chris Haniff, Christopher Salcido, Eugene Seneta, Xiaowei Sun, John Young

Proceedings Volume 12183, 1218323 (2022) https://doi.org/10.1117/12.2629499

KEYWORDS: Sensors, Cryogenics, Spectral resolution, Light sources, K band, Zemax, Prisms, Photons, Visibility

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Proceedings Article | 26 August 2022 Presentation + Paper

Beam combiner for the Asgard/BIFROST instrument

Daniel Mortimer, Sorabh Chhabra, Stefan Kraus, Narsireddy Anugu, Romain Laugier, Jean-Baptiste Le Bouquin, John Monnier

Proceedings Volume 12183, 121831U (2022) https://doi.org/10.1117/12.2629268

KEYWORDS: Signal to noise ratio, Single mode fibers, Visibility, Photons, Spatial frequencies, Spectral resolution

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Proceedings Article | 26 August 2022 Presentation + Paper

Spectrograph design for the Asgard/BIFROST spectro-interferometric instrument for the VLTI

Sorabh Chhabra, Michele Frangiamore, Stefan Kraus, Andrea Bianco, Francisco Garzon, John Monnier, Daniel Mortimer

Proceedings Volume 12183, 121830M (2022) https://doi.org/10.1117/12.2628805

KEYWORDS: Spectrographs, Binary data, Diffraction gratings, Calibration, Sensors, Prisms, Spectral resolution, Diffraction, Reflectivity

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Proceedings Article | 26 August 2022 Presentation + Paper

High spectral-resolution interferometry down to one micron with Asgard/BIFROST at VLTI: science drivers and project overview

Stefan Kraus, Daniel Mortimer, Sorabh Chhabra, Yi Lu, Isabelle Codron, Tyler Gardner, Narsireddy Anugu, John Monnier, Jean-Baptiste Le Bouquin, Michael Ireland, Frantz Martinache, Denis Defrère, Marc-Antoine Martinod

Proceedings Volume 12183, 121831S (2022) https://doi.org/10.1117/12.2627973

KEYWORDS: Stars, Spectral resolution, Interferometry, Exoplanets, Astronomical interferometry, Infrared detectors, Astronomical spectroscopy

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Proceedings Article | 26 August 2022 Presentation + Paper

High-angular and high-contrast VLTI observations from Y to M band with the Asgard instrumental suite

Marc-Antoine Martinod, Denis Defrère, Michael Ireland, Stefan Kraus, Frantz Martinache, Peter Tuthill, Azzurra Bigioli, Julia Bryant, Sorabh Chhabra, Benjamin Courtney-Barrer, Fred Crous, Nick Cvetojevic, Colin Dandumont, Germain Garreau, Tiphaine Lagadec, Romain Laugier, Daniel Mortimer, Barnaby Norris, Gordon Robertson, Adam Taras

Proceedings Volume 12183, 1218310 (2022) https://doi.org/10.1117/12.2628151

KEYWORDS: Sensors, Mirrors, Cameras, Lawrencium, Camera shutters, L band, Interferometers, Calibration, Spectral resolution, Spatial resolution

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Proceedings Article | 13 December 2020 Presentation + Paper

Setting the stage for first fringes with the Magdalena Ridge Observatory Interferometer

M. Creech-Eakman, V. Romero, C. Haniff, D. Buscher, J. Young, A. Olivares, E. Ligon, I. Payne, B. Avila, S. Blevins, N. Chowdhury, R. Collins, C. Dahl, D. Das Roy, J. Dooley, D. Etscorn, S. Etscorn, A. Farris, M. Fisher, E. Garcia, M. Gabaldon, C. Gino, R. Halder, O. Hosseini, B. Jaynes, L. Jencka, P. Johnston, S. Jojola, J. Luis, J. Maes, W. Martin, T. Matthews, C. McKeen, S. Mohammadi, D. Mortimer, S. Norouzi, D. Ochoa, B. Panta, J. Pino, I. Salayandia, C. Salcido, A. Sanchez, F. Santoro, E. B. Seneta, X. Sun, D. Wilson, J. Wolfram

Proceedings Volume 11446, 1144609 (2020) https://doi.org/10.1117/12.2563173

KEYWORDS: Interferometers, Magdalena Ridge Observatory, Telescopes, Infrared telescopes, Infrared imaging, Infrared radiation, Optical instrument design, Beam controllers, Control systems, Sensors

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Proceedings Article | 13 December 2020 Presentation + Paper

First laboratory results from FOURIER, the initial science combiner at the MROI

Daniel Mortimer, David Buscher, Michelle Creech-Eakman, Chris Haniff, Edgar Ligon, James Luis, Christopher Salcido, Eugene Seneta, Xiaowei Sun, John Young

Proceedings Volume 11446, 114460V (2020) https://doi.org/10.1117/12.2561472

KEYWORDS: Free space optics, K band, Interferometry, Magdalena Ridge Observatory, Interferometers, Sensors, Free space, Spatial filters

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Proceedings Article | 9 July 2018 Presentation + Paper

The Magdalena Ridge Observatory interferometer: first light and deployment of the first telescope on the array

M. Creech-Eakman, V. Romero, I. Payne, C. Haniff, D. Buscher, J. Young, F. Santoro, R. Blasi, C. Dahl, J. Dooley, D. Etscorn, A. Farris, M. Fisher, E. Garcia, C. Gino, B. Jaynes, L. Jencka, P. Johnston, C. Jurgenson, R. Kelly, D. Klinglesmith, E. R. Ligon, J. Luis, T. McCracken, C. McKeen, D. Mortimer, D. Ochoa, A. Olivares, J. Pino, C. Salcido, L. Schmidt, E. Seneta, X. Sun, D. Wilson

Proceedings Volume 10701, 1070106 (2018) https://doi.org/10.1117/12.2314155

KEYWORDS: Telescopes, Space telescopes, Interferometers, Mirrors, Interferometry, Sensors, Relays, Optical instrument design, Magdalena Ridge Observatory, Reflector telescopes

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The Magdalena Ridge Observatory Interferometer (MROI) has been under development for almost two decades. Initial funding for the facility started before the year 2000 under the Army and then Navy, and continues today through the Air Force Research Laboratory. With a projected total cost of substantially less than $200M, it represents the least expensive way to produce sub-milliarcsecond optical/near-infrared images that the astronomical community could invest in during the modern era, as compared, for instance, to extremely large telescopes or space interferometers. The MROI, when completed, will be comprised of 10 x1.4m diameter telescopes distributed on a Y-shaped array such that it will have access to spatial scales ranging from about 40 milliarcseconds down to less than 0.5 milliarcseconds. While this type of resolution is not unprecedented in the astronomical community, the ability to track fringes on and produce images of complex targets approximately 5 magnitudes fainter than is done today represents a substantial step forward. All this will be accomplished using a variety of approaches detailed in several papers from our team over the years. Together, these two factors, multiple telescopes deployed over very long-baselines coupled with fainter limiting magnitudes, will allow MROI to conduct science on a wide range and statistically meaningful samples of targets. These include pulsating and rapidly rotating stars, mass-loss via accretion and mass-transfer in interacting systems, and the highly-active environments surrounding black holes at the centers of more than 100 external galaxies. This represents a subsample of what is sure to be a tremendous and serendipitous list of science cases as we move ahead into the era of new space telescopes and synoptic surveys. Additional investigations into imaging man-made objects will be undertaken, which are of particular interest to the defense and space-industry communities as more human endeavors are moved into the space environment.

In 2016 the first MROI telescope was delivered and deployed at Magdalena Ridge in the maintenance facility. Having undergone initial check-out and fitting the system with optics and a fast tip-tilt system, we eagerly anticipate installing the telescope enclosure in 2018. The telescope and enclosure will be integrated at the facility and moved to the center of the interferometric array by late summer of 2018 with a demonstration of the performance of an entire beamline from telescope to beam combiner table shortly thereafter. At this point, deploying two more telescopes and demonstrating fringe-tracking, bootstrapping and limiting magnitudes for the facility will prove the full promise of MROI. A complete status update of all subsystems follows in the paper, as well as discussions of potential collaborative initiatives.

Proceedings Article | 9 July 2018 Paper

Prototyping FOURIER: the first generation near-infrared science beam combiner at the MROI

D. Mortimer, D. Buscher

Proceedings Volume 10701, 107010C (2018) https://doi.org/10.1117/12.2309932

KEYWORDS: K band, Sensors, Mirrors, Prisms, Interferometers, Visibility, Dispersion, Telescopes, Stars, Interferometry

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