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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693681.0, MPI für Astronomie / Publikationen_mpia
Direct imaging detection of methane in the atmosphere of GJ 504 b
Authors:Janson, M.; Brandt, T. D.; Kuzuhara, M.; Spiegel, D. S.; Thalmann, C.; Currie, T.; Bonnefoy, M.; Zimmerman, N.; Sorahana, S.; Kotani, T.; Schlieder, J.; Hashimoto, J.; Kudo, T.; Kusakabe, N.; Abe, L.; Brandner, W.; Carson, J. C.; Egner, S.; Feldt, M.; Goto, M.; Grady, C. A.; Guyon, O.; Hayano, Y.; Hayashi, M.; Hayashi, S.; Henning, T.; Hodapp, K. W.; Ishii, M.; Iye, M.; Kandori, R.; Knapp, G. R.; Kwon, J.; Matsuo, T.; McElwain, M. W.; Mede, K.; Miyama, S.; Morino, J.-I.; Moro-Martín, A.; Nakagawa, T.; Nishimura, T.; Pyo, T.-S.; Serabyn, E.; Suenaga, T.; Suto, H.; Suzuki, R.; Takahashi, Y.; Takami, M.; Takato, N.; Terada, H.; Tomono, D.; Turner, E. L.; Watanabe, M.; Wisniewski, J.; Yamada, T.; Takami, H.; Usuda, T.; Tamura, M.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:The Astrophysical Journal Letters
Issue / Number:1
Start Page:id. L4 (6 pp)
Audience:Not Specified
Abstract / Description:Most exoplanets detected by direct imaging thus far have been characterized by relatively hot (gsim1000 K) and cloudy atmospheres. A surprising feature in some of their atmospheres has been a distinct lack of methane, possibly implying non-equilibrium chemistry. Recently, we reported the discovery of a planetary companion to the Sun-like star GJ 504 using Subaru/HiCIAO within the Strategic Exploration of Exoplanets and Disks with Subaru survey. The planet is substantially colder (<600 K) than previously imaged planets, and has indications of fewer clouds, which implies that it represents a new class of planetary atmospheres with expected similarities to late T-type brown dwarfs in the same temperature range. If so, one might also expect the presence of significant methane absorption, which is characteristic of such objects. Here, we report the detection of deep methane absorption in the atmosphere of GJ 504 b, using the Spectral Differential Imaging mode of HiCIAO to distinguish the absorption features around 1.6 μm. We also report updated JHK photometry based on new K s-band data and a re-analysis of the existing data. The results support the notion that
Free Keywords:planetary systems; stars: solar-type; techniques: photometric
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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