Near-infrared Multi-band Photometry of the Substellar Companion GJ 758 B
- Creators
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Janson, M.
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Crepp, J.
Abstract
GJ 758 B is a cold (~600 K) companion to a Sun-like star at 29 AU projected separation, which was recently detected with high-contrast imaging. Here, we present photometry of the companion in seven photometric bands from Subaru/HiCIAO, Gemini/NIRI, and Keck/NIRC2, providing a rich sampling of the spectral energy distribution in the 1-5 μm wavelength range. A clear detection at 1.58 μm combined with an upper limit at 1.69 μm shows methane absorption in the atmosphere of the companion. The mass of the companion remains uncertain, but an updated age estimate indicates that the most likely mass range is ~30-40 M_(jup). In addition, we present an updated astrometric analysis that imposes tighter constraints on GJ 758 B's orbit and identifies the proposed second candidate companion, "GJ 758 C," as a background star.
Additional Information
© 2011 American Astronomical Society. Received 2010 September 25; accepted 2010 December 13; published 2011 January 24. We thank David Lafrenière for providing us with the source code for LOCI, Eric Mamajek for useful discussion, the staff at Subaru, Gemini, and Keck for their support, and an anonymous referee for useful suggestions. The Gemini time was allocated by NOAO. The Keck telescope was funded by the W.M. Keck foundation and time was allocated by NASA through partnership with Caltech and UC. We acknowledge the cultural significance that the summit of Mauna Kea has to the indigenous Hawaiian community. Part of the research was supported by NSF grants AST 1009203, AST 0802230, AST 1009314, the AAS Chretien grant, a Grant-in-Aid for Specially Promoted Research, the Mitsubishi Foundation, and JPL, Caltech under NASA contract. Facilities: Subaru (HiCIAO, AO188), Gemini:Gillett (NIRI), Keck:II (NIRC2)Attached Files
Published - Janson2011p13130Astrophys_J.pdf
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Additional details
- Eprint ID
- 23031
- Resolver ID
- CaltechAUTHORS:20110322-091234809
- W. M. Keck Foundation
- AST-1009203
- NSF
- AST-0802230
- NSF
- AST-1009314
- NSF
- American Astronomical Society
- Mitsubishi Foundation
- Caltech/JPL
- Created
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2011-03-23Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field