Astrophysics> Solar and Stellar Astrophysics
arXiv:1011.5505 (astro-ph)
[Submitted on 24 Nov 2010 (v1), last revised 13 Apr 2011 (this version, v2)]
Title:Near-Infrared Multi-Band Photometry of the Substellar Companion GJ 758 B
Authors:M. Janson, J. Carson, C. Thalmann, M.W. McElwain, M. Goto, J. Crepp, J. Wisniewski, L. Abe, W. Brandner, A. Burrows, S. Egner, M. Feldt, C. A. Grady, T. Golota, O. Guyon, J. Hashimoto, Y. Hayano, M. Hayashi, S. Hayashi, T. Henning, K. W. Hodapp, M. Ishii, M. Iye, R. Kandori, G. R. Knapp, T. Kudo, N. Kusakabe, M. Kuzuhara, T. Matsuo, S. Mayama, S. Miyama, J.-I. Morino, A. Moro-Martin, T. Nishimura, T.-S. Pyo, E. Serabyn, H. Suto, R. Suzuki, M. Takami, N. Takato, H. Terada, B. Tofflemire, D. Tomono, E. L. Turner, M. Watanabe, T. Yamada, H. Takami, T. Usuda, M. Tamura
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Abstract:GJ 758 B is a cold (~600K) 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 micron wavelength range. A clear detection at 1.58 micron combined with an upper limit at 1.69 micron 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 Mjup. 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.
| Comments: | 10 pages, 4 figures, accepted for publication in ApJ Letters. New version: Corrected a few numbers in the astrometry section (which were already correct in the print version, but were based on an outdated simulation in the astro-ph version) |
| Subjects: | Solar and Stellar Astrophysics (astro-ph.SR); Earth and Planetary Astrophysics (astro-ph.EP) |
| Cite as: | arXiv:1011.5505 [astro-ph.SR] |
| (or arXiv:1011.5505v2 [astro-ph.SR] for this version) | |
| https://doi.org/10.48550/arXiv.1011.5505
arXiv-issued DOI via DataCite
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| Related DOI: | https://doi.org/10.1088/0004-637X/728/2/85
DOI(s) linking to related resources
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Submission history
From: Markus Janson [view email][v1] 2010年11月24日 21:00:08 UTC (1,143 KB)
[v2] 2011年4月13日 14:19:39 UTC (1,143 KB)
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