Direct imaging discovery of a "sUPER-JUPITER" around the late b-type star κ and

J. Carson, C. Thalmann, M. Janson, T. Kozakis, M. Bonnefoy, B. Biller, J. Schlieder, T. Currie, M. McElwain, M. Goto, T. Henning, W. Brandner, M. Feldt, R. Kandori, M. Kuzuhara, L. Stevens, P. Wong, K. Gainey, M. Fukagawa, Y. KuwadaT. Brandt, J. Kwon, L. Abe, S. Egner, C. Grady, O. Guyon, J. Hashimoto, Y. Hayano, M. Hayashi, S. Hayashi, K. Hodapp, M. Ishii, M. Iye, G. Knapp, T. Kudo, N. Kusakabe, T. Matsuo, S. Miyama, J. Morino, A. Moro-Martin, T. Nishimura, T. Pyo, E. Serabyn, H. Suto, R. Suzuki, M. Takami, N. Takato, H. Terada, D. Tomono, E. Turner, M. Watanabe, J. Wisniewski, T. Yamada, H. Takami, T. Usuda, M. Tamura

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138 Scopus citations


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 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.

Original languageEnglish (US)
Article numberL32
JournalAstrophysical Journal Letters
Issue number2
StatePublished - Feb 1 2013

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • brown dwarfs
  • planets and satellites: detection
  • stars: massive


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