Planetary companions around two solar-type stars: HD 195019 and HD 217107

被引:96
作者
Fischer, DA [1 ]
Marcy, GW
Butler, RP
Vogt, SS
Apps, K
机构
[1] San Francisco State Univ, Dept Phys & Astron, San Francisco, CA 94132 USA
[2] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
[3] Anglo Australian Observ, Epping, NSW 1710, Australia
[4] Univ Calif Santa Cruz, Lick Observ, UCO, Santa Cruz, CA 95064 USA
[5] Univ Sussex, Brighton BN1, E Sussex, England
基金
美国国家科学基金会;
关键词
D O I
10.1086/316304
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have enlarged the sample of stars in the planet search at Lick Observatory. Doppler measurements of 82 new stars observed at Lick Observatory, with additional velocities from Keek Observatory, have revealed two new planet candidates. The G3 V/IV star, HD 195019, exhibits Keplerian velocity variations with period of 18.27 days, an orbital eccentricity of 0.03 +/- 0.03, and M sin i = 3.51 M-JUP. Based on a measurement of Ca II H and K emission, this star is chromospherically inactive. We estimate the metallicity of HD 195019 to be approximately solar from ubvy photometry. The second planet candidate was detected around HD 217107, a G7 V star. This star exhibits a 7.12 day Keplerian period with eccentricity 0.14 +/- 0.05 and M sin i = 1.27 M-JUP. HD 217107 is also chromospherically inactive. The photometric metallicity is found to be [Fe/H] = +0.29 +/- 0.1 dex. Given the relatively short orbital period, the absence of tidal spin-up in PID 217107 provides a theoretical constraint on the upper limit of the companion mass of less than 11 M-JUP .
引用
收藏
页码:50 / 56
页数:7
相关论文
共 30 条
  • [1] ARTYMOWICZ P, 1997, ASP C P, V134, P152
  • [2] Baliunas S.L., 1998, Astronomical Society of the Pacific Conference Series, Vol. 154, Cool Stars, Stellar Systems, V154, P153
  • [3] Attaining Doppler precision of 3 m s(-1)
    Butler, RP
    Marcy, GW
    Williams, E
    McCarthy, C
    Dosanjh, P
    Vogt, SS
    [J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1996, 108 (724) : 500 - 509
  • [4] Three new ''51 Pegasi-type'' planets
    Butler, RP
    Marcy, GW
    Williams, E
    Hauser, H
    Shirts, P
    [J]. ASTROPHYSICAL JOURNAL, 1997, 474 (02) : L115 - L118
  • [5] BUTLER RP, 1998, IN PRESS PASP
  • [6] The discovery of a planetary companion to 16 Cygni B
    Cochran, WD
    Hatzes, AP
    Butler, RP
    Marcy, GW
    [J]. ASTROPHYSICAL JOURNAL, 1997, 483 (01) : 457 - 463
  • [7] DUQUENNOY A, 1991, ASTRON ASTROPHYS, V248, P485
  • [8] FORD EB, 1999, IN PRESS APJ
  • [9] Gonzalez G, 1998, ASTRON ASTROPHYS, V334, P221
  • [10] Lang K. R., 1992, Astrophysical Data: Planets and Stars, DOI 10.1007/978-1-4684-0640-5