A close-in planet orbiting giant star HD 167768

被引：3

作者：

Teng, Huan-Yu ^{[1
]}

Sato, Bun'ei ^{[1
]}

Kunitomo, Masanobu ^{[2
]}

Takarada, Takuya ^{[3
]}

Omiya, Masashi ^{[3
,4
]}

Harakawa, Hiroki ^{[5
]}

Xiao, Guang-Yao ^{[6
,7
]}

Liu, Yu-Juan ^{[6
]}

Izumiura, Hideyuki ^{[8
]}

Kambe, Eiji ^{[5
]}

Yoshida, Michitoshi ^{[5
]}

Itoh, Yoichi ^{[9
]}

Ando, Hiroyasu ^{[4
]}

Kokubo, Eiichiro ^{[10
]}

Ida, Shigeru ^{[11
]}

机构：

[1] Tokyo Inst Technol, Sch Sci, Dept Earth & Planetary Sci, Meguro Ku, 2-12-1 Ookayama, Tokyo 1528551, Japan

[2] Kurume Univ, Dept Phys, 67 Asahi Machi, Kurume, Fukuoka 8300011, Japan

[3] Natl Inst Nat Sci, Astrobiol Ctr, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

[4] Natl Inst Nat Sci, Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

[5] Natl Inst Nat Sci, Natl Astron Observ Japan, Subaru Telescope, 650 North Aohoku Pl, Hilo, HI 96720 USA

[6] Chinese Acad Sci, Natl Astron Observ, CAS Key Lab Opt Astron, Beijing 100101, Peoples R China

[7] Tibet Univ, Coll Sci, Dept Phys, Lhasa 850000, Peoples R China

[8] Natl Inst Nat Sci, Natl Astron Observ Japan, Subaru Telescope, Okayama Branch Off, Asakuchi, Okayama 7190232, Japan

[9] Univ Hyogo, Ctr Astron, Nishi Harima Astron Observ, 407-2 Nishigaichi, Sayo, Hyogo 6795313, Japan

[10] Grad Univ Adv Studies SOKENDAI, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

[11] Tokyo Inst Technol, Earth Life Sci Inst, Meguro Ku, 2-12-1 Ookayama, Tokyo 1528551, Japan

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 2023年 / 75卷 / 01期

基金：

日本学术振兴会; 国家重点研发计划;

关键词：

planetary systems; stars: individual (HD 167768); techniques: radial velocities; STELLAR; OSCILLATIONS; EXOPLANETS; MODULES; TESS; PERIODOGRAM; METALLICITY; COMPANIONS; AMPLITUDES; EFFICIENT;

D O I：

10.1093/pasj/psac097

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the detection of a giant planet orbiting the G-type giant star HD 167768 from radial velocity measurements using the High Dispersion Echelle Spectrograph (HIDES) at Okayama Astrophysical Observatory (OAO). HD 167768 has a mass of 1.08(-0.12) (+0.14) M-?, a radius of 9.70 R-+0.25 (-0.25)?, a metallicity of [Fe/H] = -0.67+0.09 -0.08 , and a surface gravity of log g = 2.50(-0.06.)(+0.06) .The planet orbiting the star is a warm Jupiter, having a period of 20.6532(-0.0032)( +0.0032) d, a minimum mass of 0.85(-0.11)(+0.12) MJ , and an orbital semimajor axis of 0.1512 ( +0.0058)(-0.0063)au. The planet has one of the shortest orbital periods among those ever found around deeply evolved stars (log g < 3.5) using radial velocity methods. The equilibrium temperature of the planet is 1874 K, as high as a hot Jupiter. The radial velocities show two additional regular variations at 41 d and 95 d, suggesting the possibility of outer companions in the system. Follow-up monitoring will enable validation of the periodicity. We also calculated the orbital evolution of HD 167768 b and found that the planet will be engulfed within0.15 Gyr.

引用

页码：169 / 176

页数：8

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