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Proceedings Paper

CHARIS science: performance simulations for the Subaru Telescope's third-generation of exoplanet imaging instrumentation
Author(s): Timothy D. Brandt; Michael W. McElwain; Markus Janson; Gillian R. Knapp; Kyle Mede; Mary Anne Limbach; Tyler Groff; Adam Burrows; James E. Gunn; Olivier Guyon; Jun Hashimoto; Masahiko Hayashi; Nemanja Jovanovic; N. Jeremy Kasdin; Masayuki Kuzuhara; Robert H. Lupton; Frantz Martinache; Satoko Sorahana; David S. Spiegel; Naruhisa Takato; Motohide Tamura; Edwin L. Turner; Robert Vanderbei; John Wisniewski
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Paper Abstract

We describe the expected scientific capabilities of CHARIS, a high-contrast integral-field spectrograph (IFS) currently under construction for the Subaru telescope. CHARIS is part of a new generation of instruments, enabled by extreme adaptive optics (AO) systems (including SCExAO at Subaru), that promise greatly improved contrasts at small angular separation thanks to their ability to use spectral information to distinguish planets from quasistatic speckles in the stellar point-spread function (PSF). CHARIS is similar in concept to GPI and SPHERE, on Gemini South and the Very Large Telescope, respectively, but will be unique in its ability to simultaneously cover the entire near-infrared J, H, and K bands with a low-resolution mode. This extraordinarily broad wavelength coverage will enable spectral differential imaging down to angular separations of a few λ/D, corresponding to ~0".1. SCExAO will also offer contrast approaching 10-5 at similar separations, ~0".1–0".2. The discovery yield of a CHARIS survey will depend on the exoplanet distribution function at around 10 AU. If the distribution of planets discovered by radial velocity surveys extends unchanged to ~20 AU, observations of ~200 mostly young, nearby stars targeted by existing high-contrast instruments might find ~1–3 planets. Carefully optimizing the target sample could improve this yield by a factor of a few, while an upturn in frequency at a few AU could also increase the number of detections. CHARIS, with a higher spectral resolution mode of R ~ 75, will also be among the best instruments to characterize planets and brown dwarfs like HR 8799 cde and κ and b.

Paper Details

Date Published: 21 July 2014
PDF: 13 pages
Proc. SPIE 9148, Adaptive Optics Systems IV, 914849 (21 July 2014); doi: 10.1117/12.2057256
Show Author Affiliations
Timothy D. Brandt, Institute for Advanced Study (United States)
Michael W. McElwain, NASA Goddard Space Flight Ctr. (United States)
Markus Janson, Queen's Univ. Belfast (United Kingdom)
Gillian R. Knapp, Princeton Univ. (United States)
Kyle Mede, The Univ. of Tokyo (Japan)
Mary Anne Limbach, Princeton Univ. (United States)
Tyler Groff, Princeton Univ. (United States)
Adam Burrows, Princeton Univ. (United States)
James E. Gunn, Princeton Univ. (United States)
Olivier Guyon, Subaru Telescope, National Astronomical Observatory of Japan (United States)
The Univ. of Arizona (United States)
Jun Hashimoto, The Univ. of Oklahoma (United States)
Masahiko Hayashi, National Astronomical Observatory of Japan (Japan)
Nemanja Jovanovic, Subaru Telescope, National Astronomical Observatory of Japan (United States)
N. Jeremy Kasdin, Princeton Univ. (United States)
Masayuki Kuzuhara, National Astronomical Observatory of Japan (Japan)
Tokyo Institute of Technology (Japan)
Robert H. Lupton, Princeton Univ. (United States)
Frantz Martinache, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Laboratoire Lagrange, CNRS, Observatoire de la Côte d'Azur (France)
Satoko Sorahana, Nagoya Univ. (Japan)
David S. Spiegel, Institute for Advanced Study (United States)
Naruhisa Takato, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Motohide Tamura, National Astronomical Observatory of Japan (Japan)
Univ. of Tokyo (Japan)
Edwin L. Turner, Princeton Univ. (United States)
The Univ. of Tokyo (Japan)
Robert Vanderbei, Princeton Univ. (United States)
John Wisniewski, Univ. of Oklahoma (United States)

Published in SPIE Proceedings Vol. 9148:
Adaptive Optics Systems IV
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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