Liger at W.M. Keck Observatory: overall design and science drivers

Shelley A. Wright; Tucker Jones; James Larkin; Renate Kupke; Marc Kassis; Aaron Brown; David Andersen; Lee Armus; Bryson Cale; Maren Cosens; Devin Chu; Tuan Do; Chris Fassnacht; Deanne Fisher; Michael Fitzgerald; Andrea Ghez; Jenny Greene; Takeru Hayashi; Aurélien Hees; Jessie Hirtenstein; Chris Johnson; Jacqueline Keane; Patrick Kelly; Evan Kirby; Theodara Karalidi; Quinn Konopacky; Evan Kress; Jessica Lu; Jim Lyke; Kenneth Magnone; Jérôme Maire; Rosalie McGurk; Anne Medling; Maxwell Millar-Blanchaer; Quinn Minor; Reston Nash; Anna Nierenberg; Naveen Reddy; Michael Rich; Jean-Baptiste Ruffio; Nils-Erik Rundquist; Sanchit Sabhlok; David Sand; Ryan Sanders; Karin Sandstrom; Alice Shapley; Ji-Man Sohn; Arun Surya; Tommaso Treu; Eric Wang; Kanaka Warad; Robert Weber; James Wiley; Peter Wizinowich; Michael H. Wong; Sherry Yeh

doi:10.1117/12.3020803

30 July 2024 Liger at W.M. Keck Observatory: overall design and science drivers

Shelley A. Wright, Tucker Jones, James Larkin, Renate Kupke, Marc Kassis, Aaron Brown, David Andersen, Lee Armus, Bryson Cale, Maren Cosens, Devin Chu, Tuan Do, Chris Fassnacht, Deanne Fisher, Michael Fitzgerald, Andrea Ghez, Jenny Greene, Takeru Hayashi, Aurélien Hees, Jessie Hirtenstein, Chris Johnson, Jacqueline Keane, Patrick Kelly, Evan Kirby, Theodara Karalidi, Quinn Konopacky, Evan Kress, Jessica Lu, Jim Lyke, Kenneth Magnone, Jérôme Maire, Rosalie McGurk, Anne Medling, Maxwell Millar-Blanchaer, Quinn Minor, Reston Nash, Anna Nierenberg, Naveen Reddy, Michael Rich, Jean-Baptiste Ruffio, Nils-Erik Rundquist, Sanchit Sabhlok, David Sand, Ryan Sanders, Karin Sandstrom, Alice Shapley, Ji-Man Sohn, Arun Surya, Tommaso Treu, Eric Wang, Kanaka Warad, Robert Weber, James Wiley, Peter Wizinowich, Michael H. Wong, Sherry Yeh

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130960G (2024) https://doi.org/10.1117/12.3020803
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

Liger is a next-generation near-infrared (0.81 - 2.45 μm) integral field spectrograph (IFS) and imaging camera for the W. M. Keck Observatory (WMKO) adaptive optics (AO) system. The instrument concept originated by coupling designs from WMKO AO instruments and the future Thirty Meter Telescope IRIS spectrograph. Liger is designed for the Keck I telescope to operate behind the upcoming Keck All-sky Precision Adaptive optics (KAPA) system. The imaging camera sequentially feeds an IFS that makes use of slicer assembly for the coarsest sampling (75 mas and 150 mas per spaxel) and lenslet array (14 mas and 31 mas per spaxel) for diffraction-limited sampling. The imaging camera makes use of off-axis parabolas and a Hawaii-2RG detector to achieve a 14 mas/pixel plate scale and 20.5"×20.5" field of view. The IFS offers a range of spectral resolving power of R=4,000 { 10,000 and yields large fields of view for an AO-fed IFS. Liger will enable new science by providing enhanced capabilities, including higher spectral resolving power, access to shorter wavelengths, and larger fields of view than any current or planned ground- or space-based IFS system. Liger will be able to unlock previously inaccessible science across a wide range of the cosmos, such as dark matter substructure, supermassive black holes, the Galactic Center, exoplanet atmospheres, and the time-variable Solar System. We present the overall design of the Liger subsystems and review unique science drivers.

Conference Presentation

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Shelley A. Wright, Tucker Jones, James Larkin, Renate Kupke, Marc Kassis, Aaron Brown, David Andersen, Lee Armus, Bryson Cale, Maren Cosens, Devin Chu, Tuan Do, Chris Fassnacht, Deanne Fisher, Michael Fitzgerald, Andrea Ghez, Jenny Greene, Takeru Hayashi, Aurélien Hees, Jessie Hirtenstein, Chris Johnson, Jacqueline Keane, Patrick Kelly, Evan Kirby, Theodara Karalidi, Quinn Konopacky, Evan Kress, Jessica Lu, Jim Lyke, Kenneth Magnone, Jérôme Maire, Rosalie McGurk, Anne Medling, Maxwell Millar-Blanchaer, Quinn Minor, Reston Nash, Anna Nierenberg, Naveen Reddy, Michael Rich, Jean-Baptiste Ruffio, Nils-Erik Rundquist, Sanchit Sabhlok, David Sand, Ryan Sanders, Karin Sandstrom, Alice Shapley, Ji-Man Sohn, Arun Surya, Tommaso Treu, Eric Wang, Kanaka Warad, Robert Weber, James Wiley, Peter Wizinowich, Michael H. Wong, and Sherry Yeh "Liger at W.M. Keck Observatory: overall design and science drivers", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130960G (30 July 2024); https://doi.org/10.1117/12.3020803

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