Journal
ASTROPHYSICAL JOURNAL
Volume 728, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/728/2/85
Keywords
brown dwarfs; planetary systems; techniques: high angular resolution
Categories
Funding
- W.M. Keck foundation
- NSF [AST 1009203, AST 0802230, AST 1009314]
- AAS Chretien
- Mitsubishi Foundation
- JPL
- Caltech under NASA
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1008440, 0901967] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1009203, 0802230, 1009314] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [19104004] Funding Source: KAKEN
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GJ 758 B is a cold (similar to 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 mu m wavelength range. A clear detection at 1.58 mu m combined with an upper limit at 1.69 mu m 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 similar to 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.
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