A Massive Substellar Companion to the Massive Giant HD 119445

被引：22

作者：

Omiya, Masashi ^{[1
]}

Izumiura, Hideyuki ^{[2
,3
]}

Han, Inwoo ^{[4
]}

Lee, Byeong-Cheol ^{[4
,5
]}

Sato, Bun'ei ^{[6
]}

Kambe, Eiji ^{[2
]}

Kim, Kang-Min ^{[4
]}

Yoon, Tae Seog ^{[5
]}

Yoshida, Michitoshi ^{[2
]}

Masuda, Seiji ^{[7
]}

Toyota, Eri ^{[8
]}

Urakawa, Seitaro ^{[9
]}

Takada-Hidai, Masahide ^{[10
]}

机构：

[1] Tokai Univ, Dept Phys, Kanagawa 2591292, Japan

[2] Natl Astron Observ Japan, Okayama Astrophys Observ, Kamogatacho, Okayama 7190232, Japan

[3] Grad Univ Adv Studies, Dept Astron Sci, Mitaka, Tokyo 1818588, Japan

[4] Korea Astron & Space Sci Inst, Taejon 305348, South Korea

[5] Kyungpook Natl Univ, Dept Astron & Atmospher Sci, Taegu 702701, South Korea

[6] Tokyo Inst Technol, Global Edge Inst, Meguro Ku, Tokyo 1528550, Japan

[7] Asutamu Land Tokushima, Tokushima Sci Museum, Tokushima 7790111, Japan

[8] Kobe Sci Museum, Chuo Ku, Kobe, Hyogo 6500046, Japan

[9] Japan Spaceguard Assoc, Bisei Spaceguard Ctr, Okayama 7141411, Japan

[10] Tokai Univ, Liberal Arts Educ Ctr, Kanagawa 2591292, Japan

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 2009年 / 61卷 / 04期

基金：

日本学术振兴会;

关键词：

stars: individual (HD 119445); star:; low-mass; brown dwarfs; techniques: radial velocities; BROWN DWARF DESERT; PLANETARY COMPANION; EXTRASOLAR PLANETS; RADIAL-VELOCITIES; DISC FRAGMENTATION; EVOLVED STARS; OKAYAMA HIDES; IODINE CELLS; SUBARU HDS; CANDIDATE;

D O I：

10.1093/pasj/61.4.825

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We detected a brown dwarf-mass companion around the intermediate-mass giant star HD 119445 (G6111) using the Doppler technique. This discovery is the first result from a Korean-Japanese planet search program based on precise radial velocity measurements. The radial velocity of this star exhibits a periodic Keplerian variation with a period, semiamplitude, and eccentricity of 410.2 d, 413.5 m s(-1), and 0.082, respectively. Adopting a stellar mass of 3.9 M-circle dot, we were able to confirm the presence of a massive substellar companion with a semimajor axis of 1.71 AU and a minimum mass of 37.6 M-J, which falls in the middle of the brown dwarf-mass region. This substellar companion is the most massive ever discovered within 3 AU of a central intermediate-mass star. The host star also ranks among the most massive stars with substellar companions ever detected by the Doppler technique. This result supports the current view of substellar systems that more massive substellar companions tend to exist around more massive stars, and may further constrain substellar system formation mechanisms.

引用

页码：825 / 831

页数：7

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