干旱区生态环境知识资源中心(Arid): Regular radial velocity variations in nine G- and K-type giant stars: Eight planets and one planet candidate

Arid

DOI	10.1093/pasj/psab112
	Regular radial velocity variations in nine G- and K-type giant stars: Eight planets and one planet candidate
	Teng, Huan-Yu; Sato, Bun'ei; Takarada, Takuya; Omiya, Masashi; Harakawa, Hiroki; Izumiura, Hideyuki; Kambe, Eiji; Takeda, Yoichi; Yoshida, Michitoshi; Itoh, Yoichi; Ando, Hiroyasu; Kokubo, Eiichiro
通讯作者	Teng, HY (corresponding author)，Tokyo Inst Technol, Sch Sci, Dept Earth & Planetary Sci, Meguro Ku, 2-12-1 Ookayama, Tokyo 1528551, Japan.
来源期刊	PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
ISSN	0004-6264
EISSN	2053-051X
出版年	2022
卷号	74 期号:1
英文摘要	We report the detection of radial velocity (RV) variations in nine evolved G- and K-type giant stars. The observations were conducted at Okayama Astrophysical Observatory. Planets or planet candidates can best explain these regular variations. However, a coincidence of near 280d variability among five of them prevents us from fully ruling out stellar origins for some of the variations, since all nine stars behave similarly in stellar properties. In the planet hypotheses for the RV variations, the planets (including one candidate) may survive close to the boundary of the so-called planet desert around evolved stars, having orbital periods between 255 and 555 d. Besides, they are the least-massive giant planets detected around G- and K-type giant stars, with minimum masses between 0.45 M-J and 1.34 M-J. We further investigated other hypotheses for our detection, yet none of them can better explain regular RV variation. With our detection, we can be convinced that year-long regular variation with amplitude down to 15 m s(-1) for G- and K-type giant stars is detectable. Moreover, we performed simulations to further confirm the detectability of planets around these stars. Finally, we explored giant planets around intermediate-mass stars, and likewise found a four-Jupiter-mass gap (e.g., Santos et al. 2017, A&A, 603, A30), which is probably a boundary of the giant planet population.
英文关键词	planetary systems stars: individual (HD 360, epsilon Piscium, HD 10975, HD 79181, HD 99283, nu Leo, HD 161178, HD 219139, gamma Piscium) techniques: radial velocities
类型	Article
语种	英语
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000753117100008
WOS关键词	SUBSTELLAR-MASS COMPANIONS ; LONG SECONDARY PERIODS ; STELLAR PARAMETERS ; RED GIANTS ; OSCILLATIONS ; VARIABILITY ; SEARCH ; PERTURBATIONS ; ABUNDANCES ; ACCRETION
WOS类目	Astronomy & Astrophysics
WOS研究方向	Astronomy & Astrophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/376883
作者单位	[Teng, Huan-Yu; Sato, Bun'ei] Tokyo Inst Technol, Sch Sci, Dept Earth & Planetary Sci, Meguro Ku, 2-12-1 Ookayama, Tokyo 1528551, Japan; [Takarada, Takuya; Omiya, Masashi] Natl Inst Nat Sci, Astrobiol Ctr, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan; [Omiya, Masashi; Ando, Hiroyasu] Natl Inst Nat Sci, Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan; [Harakawa, Hiroki; Kambe, Eiji; Yoshida, Michitoshi] Natl Inst Nat Sci, Subaru Telescope, Natl Astron Observ Japan, 650 N Aohoku Pl, Hilo, HI 96720 USA; [Izumiura, Hideyuki] Natl Inst Nat Sci, Natl Astron Observ Japan, Okayama Branch Off, Subaru Telescope, Asakuchi, Okayama 7190232, Japan; [Takeda, Yoichi] Naka Ku, 11-2 Enomachi, Hiroshima, Hiroshima 7300851, Japan; [Itoh, Yoichi] Univ Hyogo, Ctr Astron, Nishi Harima Astron Observ, 407-2 Nishigaichi, Sayo, Hyogo 6795313, Japan; [Kokubo, Eiichiro] Grad Univ Adv Studies SOKENDAI, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
推荐引用方式 GB/T 7714	Teng, Huan-Yu,Sato, Bun'ei,Takarada, Takuya,et al. Regular radial velocity variations in nine G- and K-type giant stars: Eight planets and one planet candidate[J],2022,74(1).
APA	Teng, Huan-Yu.,Sato, Bun'ei.,Takarada, Takuya.,Omiya, Masashi.,Harakawa, Hiroki.,...&Kokubo, Eiichiro.(2022).Regular radial velocity variations in nine G- and K-type giant stars: Eight planets and one planet candidate.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,74(1).
MLA	Teng, Huan-Yu,et al."Regular radial velocity variations in nine G- and K-type giant stars: Eight planets and one planet candidate".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 74.1(2022).