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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693840.0, MPI für Astronomie / Publikationen_mpia
Direct imaging discovery of a "Super-Jupiter" around the late B-type star κ And
Authors:Carson, J.; Thalmann, C.; Janson, M.; Kozakis, T.; Bonnefoy, M.; Biller, B.; Schlieder, J.; Currie, T.; McElwain, M.; Goto, M.; Henning, T.; Brandner, W.; Feldt, M.; Kandori, R.; Kuzuhara, M.; Stevens, L.; Wong, P.; Gainey, K.; Fukagawa, M.; Kuwada, Y.; Brandt, T.; Kwon, J.; Abe, L.; Egner, S.; Grady, C.; Guyon, O.; Hashimoto, J.; Hayano, Y.; Hayashi, M.; Hayashi, S.; Hodapp, K.; Ishii, M.; Iye, M.; Knapp, G.; Kudo, T.; Kusakabe, N.; Matsuo, T.; Miyama, S.; Morino, J.; Moro-Martin, A.; Nishimura, T.; Pyo, T.; Serabyn, E.; Suto, H.; Suzuki, R.; Takami, M.; Takato, N.; Terada, H.; Tomono, D.; Turner, E.; 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:2
Start Page:id. L32 (6 pp)
Audience:Not Specified
Abstract / Description:We present the direct imaging discovery of an extrasolar planet, or possible low-mass brown dwarf, at a projected separation of 55 ± 2 AU (1.''058 ± 0.''007) from the B9-type star κ And. The planet was detected with Subaru/HiCIAO during the SEEDS survey and confirmed as a bound companion via common proper motion measurements. Observed near-infrared magnitudes of J = 16.3 ± 0.3, H = 15.2 ± 0.2, K s = 14.6 ± 0.4, and L' = 13.12 ± 0.09 indicate a temperature of ~1700 K. The galactic kinematics of the host star are consistent with membership in the Columba Association, implying a corresponding age of 30+20 –10 Myr. The system's age, combined with the companion photometry, points to a model-dependent companion mass ~12.8 M Jup. The host star's estimated mass of 2.4-2.5 M &sun; places it among the most massive stars ever known to harbor an extrasolar planet or low-mass brown dwarf. While the mass of the companion is close to the deuterium burning limit, its mass ratio, orbital separation, and likely planet-like formation scenario imply that it may be best defined as a "super-Jupiter" with properties similar to other recently discovered companions to massive stars. Based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.
Free Keywords:brown dwarfs; planets and satellites: detection; stars: massive
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.1088/2041-8205/763/2/L32
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