Search for Exoplanets around Northern Circumpolar Stars. II. The Detection of Radial Velocity Variations in M Giant Stars HD 36384, HD 52030, and HD 208742

被引：5

作者：

Lee, Byeong-Cheol ^{[1
,2
]}

Jeong, Gwanghui ^{[1
,2
]}

Park, Myeong-Gu ^{[3
]}

Han, Inwoo ^{[1
,2
]}

Mkrtichian, David E. ^{[4
,5
]}

Hatzes, Artie P. ^{[6
]}

Gu, Shenghong ^{[7
,8
]}

Bai, Jinming ^{[7
,8
]}

Lee, Sang-Min ^{[1
]}

Oh, Hyeong-Il ^{[3
]}

Kim, Kang-Min ^{[1
]}

机构：

[1] Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 305348, South Korea

[2] Korea Univ Sci & Technol, Astron & Space Sci Major, Daejeon 305333, South Korea

[3] Kyungpook Natl Univ, Dept Astron & Atmospher Sci, Daegu 702701, South Korea

[4] Natl Astron Res Inst Thailand, Chiang Mai 50200, Thailand

[5] Taras Shevchenko Natl Univ Kyiv, Crimean Astrophys Observ, UA-98409 Nauchnyi, Crimea, Ukraine

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

[7] Chinese Acad Sci, Yunnan Observ, Kunming 650011, Yunnan, Peoples R China

[8] Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Yunnan, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2017年 / 844卷 / 01期

基金：

新加坡国家研究基金会;

关键词：

planetary systems; stars:; individual; (HD; 36384; HD; 52030; 208742); stars: oscillations (including pulsations); techniques: radial velocities; INTERMEDIATE-MASS STARS; SUBSTELLAR COMPANION; BROWN-DWARF; ATMOSPHERIC PARAMETERS; PLANETARY COMPANION; EXTRASOLAR PLANETS; STELLAR EVOLUTION; ISOCHRONES; SYSTEMS; SAMPLE;

D O I：

10.3847/1538-4357/aa7577

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the detection of long-period RV variations in HD. 36384, HD. 52030, and HD. 208742 by using the high-resolution, fiber-fed Bohyunsan Observatory Echelle Spectrograph (BOES) for the precise radial velocity (RV) survey of about 200 northern circumpolar stars. Analyses of RV data, chromospheric activity indicators, and bisector variations spanning about five years suggest that the RV variations are compatible with planet or brown dwarf companions in Keplerian motion. However, HD. 36384 shows photometric variations with a period very close to that of RV variations as well as amplitude variations in the weighted wavelet Z-transform (WWZ) analysis, which argues that the RV variations in HD. 36384 are from the stellar pulsations. Assuming that the companion hypothesis is correct, HD. 52030 hosts a companion with minimum mass 13.3 M-Jup orbiting in 484 days at a distance of 1.2 au. HD. 208742 hosts a companion of 14.0 M-Jup at 1.5 au with a period of 602 days. All stars are located at the asymptotic giant branch (AGB) stage on the H-R diagram after undergoing. the helium flash and leaving. the giant clump. With stellar radii of 53.0 R-circle dot and 57.2 R-circle dot for HD. 52030 and HD. 208742, respectively, these stars may be the largest yet, in terms of stellar radius, found to host substellar companions. However, given possible RV amplitude variations and the fact that these are highly evolved stars, the planet hypothesis is not yet certain.

引用

页数：10

共 69 条

[1] XHIP: An extended hipparcos compilation [J].

Anderson, E. ;

Francis, Ch. .

ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS, 2012, 38 (05) :331-346

[2]

[Anonymous], AJ

[3] Predicting the properties of binary stellar systems: the evolution of accreting protobinary systems [J].

Bate, MR .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2000, 314 (01) :33-53

[4] JHKLM PHOTOMETRY - STANDARD SYSTEMS, PASSBANDS, AND INTRINSIC COLORS [J].

BESSELL, MS ;

BRETT, JM .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1988, 100 (631) :1134-1151

[5] Extrasolar planets and brown dwarfs around AF-type stars IX. The HARPS southern sample [J].

Borgniet, S. ;

Lagrange, A. -M. ;

Meunier, N. ;

Galland, F. .

ASTRONOMY & ASTROPHYSICS, 2017, 599

[6] Possible rapid gas giant planet formation in the solar nebula and other protoplanetary disks [J].

Boss, AP .

ASTROPHYSICAL JOURNAL, 2000, 536 (02) :L101-L104

[7] parsec: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code [J].

Bressan, Alessandro ;

Marigo, Paola ;

Girardi, Leo ;

Salasnich, Bernardo ;

Dal Cero, Claudia ;

Rubele, Stefano ;

Nanni, Ambra .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2012, 427 (01) :127-145

[8] Gaia Data Release 1 Summary of the astrometric, photometric, and survey properties [J].

Brown, A. G. A. ;

Vallenari, A. ;

Prusti, T. ;

de Bruijne, J. H. J. ;

Mignard, F. ;

Drimmel, R. ;

Babusiaux, C. ;

Bailer-Jones, C. A. L. ;

Bastian, U. ;

Biermann, M. ;

Evans, D. W. ;

Eyer, L. ;

Jansen, F. ;

Jordi, C. ;

Katz, D. ;

Klioner, S. A. ;

Lammers, U. ;

Lindegren, L. ;

Luri, X. ;

O'Mullane, W. ;

Panem, C. ;

Pourbaix, D. ;

Randich, S. ;

Sartoretti, P. ;

Siddiqui, H. I. ;

Soubiran, C. ;

Valette, V. ;

van Leeuwen, F. ;

Walton, N. A. ;

Aerts, C. ;

Arenou, F. ;

Cropper, M. ;

Hog, E. ;

Lattanzi, M. G. ;

Grebel, E. K. ;

Holland, A. D. ;

Huc, C. ;

Passot, X. ;

Perryman, M. ;

Bramante, L. ;

Cacciari, C. ;

Castaneda, J. ;

Chaoul, L. ;

Cheek, N. ;

De Angeli, F. ;

Fabricius, C. ;

Guerra, R. ;

Hernandez, J. ;

Jean-Antoine-Piccolo, A. ;

Masana, E. .

ASTRONOMY & ASTROPHYSICS, 2016, 595

[9] A nongray theory of extrasolar giant planets and brown dwarfs [J].

Burrows, A ;

Marley, M ;

Hubbard, WB ;

Lunine, JI ;

Guillot, T ;

Saumon, D ;

Freedman, R ;

Sudarsky, D ;

Sharp, C .

ASTROPHYSICAL JOURNAL, 1997, 491 (02) :856-875

[10] Attaining Doppler precision of 3 m s(-1) [J].

Butler, RP ;

Marcy, GW ;

Williams, E ;

McCarthy, C ;

Dosanjh, P ;

Vogt, SS .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1996, 108 (724) :500-509

← 1 2 3 4 5 6 7 →