The discovery of a planetary candidate around the evolved low-mass Kepler giant star HD 175370

被引：6

作者：

Hrudkova, M. ^{[1
]}

Hatzes, A. ^{[2
]}

Karjalainen, R. ^{[1
]}

Lehmann, H. ^{[2
]}

Hekker, S. ^{[3
,4
]}

Hartmann, M. ^{[2
]}

Tkachenko, A. ^{[5
]}

Prins, S. ^{[5
]}

Van Winckel, H. ^{[5
]}

De Nutte, R. ^{[6
]}

Dumortier, L. ^{[6
]}

Fremat, Y. ^{[6
]}

Hensberge, H. ^{[6
]}

Jorissen, A. ^{[7
]}

Lampens, P. ^{[6
]}

Laverick, M. ^{[5
]}

Lombaert, R. ^{[5
,8
]}

Papics, P. I. ^{[5
]}

Raskin, G. ^{[5
]}

Sodor, A. ^{[6
,9
]}

Thoul, A. ^{[10
,11
]}

Van Eck, S. ^{[7
]}

Waelkens, C. ^{[5
]}

机构：

[1] Isaac Newton Grp Telescopes, Apartado Correos 321, E-38700 Santa Cruz De La Palma, Spain

[2] Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany

[3] Max Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany

[4] Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark

[5] Katholieke Univ Leuven, Inst Sterrenkunde, Celestijnenlaan 200D Bus 2401, B-3001 Leuven, Belgium

[6] Royal Observ Belgium, 3 Ave Circulaire, B-1180 Brussels, Belgium

[7] Univ Libre Bruxelles, Inst Astron & Astrophys, CP 226,Blvd Triomphe, B-1050 Brussels, Belgium

[8] Chalmers Univ Technol, Onsala Space Observ, Dept Earth & Space Sci, SE-43992 Onsala, Sweden

[9] Hungarian Acad Sci, Res Ctr Astron & Earth Sci, Konkoly Observ, H-1121 Budapest, Hungary

[10] Univ Liege, Inst Astrophys & Geophys, 17 Allee 6 Aout, B-4000 Liege, Belgium

[11] Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Kohn Hall, Santa Barbara, CA 93106 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 464卷 / 01期

基金：

欧洲研究理事会; 比利时弗兰德研究基金会;

关键词：

methods: data analysis; methods: observational; techniques: radial velocities; techniques: spectroscopic; stars: individual: HD 175370 (KIC 007940959); planetary systems; PRECISE RADIAL-VELOCITIES; RED GIANTS; OSCILLATION PARAMETERS; LOW-AMPLITUDE; STELLAR MASS; K-GIANTS; COMPANION; LINE; MODES; ASTEROSEISMOLOGY;

D O I：

10.1093/mnras/stw2379

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on the discovery of a planetary companion candidate with a minimum mass M sin i = 4.6 +/- 1.0 M-Jupiter orbiting the K2 III giant star HD 175370 (KIC 007940959). This star was a target in our programme to search for planets around a sample of 95 giant stars observed with Kepler. This detection was made possible using precise stellar radial velocity measurements of HD 175370 taken over five years and four months using the coude echelle spectrograph of the 2-m Alfred Jensch Telescope and the fibre-fed echelle spectrograph High Efficiency and Resolution Mercator Echelle Spectrograph of the 1.2-m Mercator Telescope. Our radial velocity measurements reveal a periodic (349.5 +/- 4.5 d) variation with a semi-amplitude K = 133 +/- 25 ms(-1), superimposed on a long-term trend. A low-mass stellar companion with an orbital period of similar to 88 yr in a highly eccentric orbit and a planet in a Keplerian orbit with an eccentricity e = 0.22 are the most plausible explanation of the radial velocity variations. However, we cannot exclude the existence of stellar envelope pulsations as a cause for the low-amplitude radial velocity variations and only future continued monitoring of this system may answer this uncertainty. From Kepler photometry, we find that HD 175370 is most likely a low-mass red giant branch or asymptotic giant branch star.

引用

页码：1018 / 1028

页数：11

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