Revisiting planetary systems in the Okayama Planet Search Program: A new long-period planet, RV astrometry joint analysis, and a multiplicity-metallicity trend around evolved stars

被引：5

作者：

Teng, Huan-Yu ^{[1
]}

Sato, Bun'ei ^{[1
]}

Kuzuhara, Masayuki ^{[2
]}

Takarada, Takuya ^{[2
]}

Omiya, Masashi ^{[2
,3
]}

Harakawa, Hiroki ^{[4
]}

Izumiura, Hideyuki ^{[5
]}

Kambe, Eiji ^{[4
]}

Yilmaz, Mesut ^{[6
]}

Bikmaev, Ilfan ^{[7
,8
]}

Selam, Selim O. ^{[6
]}

Brandt, Timothy D. ^{[9
]}

Xiao, Guang-Yao ^{[10
,11
]}

Yoshida, Michitoshi ^{[4
]}

Itoh, Yoichi ^{[12
]}

Ando, Hiroyasu ^{[3
]}

Kokubo, Eiichiro ^{[3
]}

Ida, Shigeru ^{[13
]}

机构：

[1] Tokyo Inst Technol, Dept Earth & Planetary Sci, Sch Sci, 2-12-1 Ookayama,Meguro Ku, Tokyo 1528550, Japan

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

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

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

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

[6] Ankara Univ, Dept Astron & Space Sci, TR-06100 Besevler Ankara, Turkiye

[7] Kazan Fed Univ, Kremlyevskaya Str 18, Kazan 420008, Russia

[8] Acad Sci Tatarstan, Bauman Str 20, Kazan 420111, Russia

[9] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

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

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

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

[13] Tokyo Inst Technol, Earth Life Sci Inst, 2-12-1 Ookayama,Meguro Ku, Tokyo 1528550, Japan

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 2023年 / 75卷 / 06期

基金：

美国国家科学基金会; 日本学术振兴会;

关键词：

planetary systems; stars: individual; techniques: radial velocities; PRECISE RADIAL-VELOCITIES; HIGH-DISPERSION SPECTROGRAPH; HIPPARCOS-GAIA CATALOG; INTERMEDIATE-MASS G; GAS GIANT PLANETS; K-GIANT; SUBSTELLAR COMPANION; EXTRASOLAR PLANETS; STELLAR PARAMETERS; MAGNETIC ACTIVITY;

D O I：

10.1093/pasj/psad056

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this study, we revisit 32 planetary systems around evolved stars observed within the framework of the Okayama Planet Search Program (OPSP) and its collaborative framework of the East Asian Planet Search Network to search for additional companions and investigate the properties of stars and giant planets in multiple-planet systems. With our latest radial velocities obtained from Okayama Astrophysical Observatory, we confirm an additional giant planet in the wide orbit of the 75 Cet system (P-c = 2051.62(-40.47)(+45.98) d, M-c sin i = 0.912(-0.090)(+0.088) M J, and a c = 3.929(-0.058)(+0.052) au), along with five stars exhibiting long-term radial velocity accelerations, which indicates massive companions in the wide orbits. We also find that the radial velocity variations of several planet-harboring stars may indicate additional planet candidates, stellar activities, or other understudied sources. These stars include c Tau, 11 Com, 24 Boo, 41 Lyn, 14 And, HD 32518, and. Ser. We further constrain the orbital configuration of the HD 5608, HD 14067, HD 120084, and HD 175679 systems by combining radial velocities with astrometry, as their host central stars exhibit significant astrometric accelerations. For other systems, we simply refine their orbital parameters. Moreover, our study indicates that the OPSP planet-harboring stars are more metal poor compared to the currently known planet-harboring stars, and this is likely due to the B - V color upper limit at 1.0 for star selection in the beginning of the survey. Finally, by investigating the less massive giant planets ( <5 M-J) around currently known planet-harboring evolved stars, we find that metallicity positively correlates with the multiplicity and total planet mass of the system, which can be evidence for the core-accretion planet formation model.

引用

页码：1030 / 1071

页数：42