THE NASA-UC ETA-EARTH PROGRAM. I. A SUPER-EARTH ORBITING HD 7924

被引：100

作者：

Howard, Andrew W. ^{[1
]}

Johnson, John Asher ^{[2
]}

Marcy, Geoffrey W. ^{[1
]}

Fischer, Debra A. ^{[3
]}

Wright, Jason T. ^{[4
]}

Henry, Gregory W. ^{[5
]}

Giguere, Matthew J. ^{[3
]}

Isaacson, Howard ^{[3
]}

Valenti, Jeff A. ^{[6
]}

Anderson, Jay ^{[6
]}

Piskunov, Nikolai E. ^{[7
]}

机构：

[1] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

[2] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[3] San Francisco State Univ, Dept Phys & Astron, San Francisco, CA 94132 USA

[4] Cornell Univ, Dept Astron, Ithaca, NY 14853 USA

[5] Tennessee State Univ, Ctr Excellence Informat Syst, Nashville, TN 37209 USA

[6] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[7] Uppsala Univ, Dept Space Phys & Astron, S-75120 Uppsala, Sweden

来源：

ASTROPHYSICAL JOURNAL | 2009年 / 696卷 / 01期

关键词：

planetary systems; stars: individual (HD 7924); techniques: radial velocities; EXTRA-SOLAR PLANETS; M-CIRCLE-PLUS; HARPS SEARCH; DETERMINISTIC MODEL; PERIOD DISTRIBUTION; STELLAR-MASS; COOL STARS; SYSTEM; KECK; EXOPLANETS;

D O I：

10.1088/0004-637X/696/1/75

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of the first low-mass planet to emerge from the NASA-UC Eta-Earth Program, a super-Earth orbiting the K0 dwarf HD 7924. Keplerian modeling of precise Doppler radial velocities reveals a planet with minimum mass M(P) sin i = 9.26M(circle plus) in a P = 5.398 d orbit. Based on Keck-HIRES measurements from 2001 to 2008, the planet is robustly detected with an estimated false alarm probability of less than 0.001. Photometric observations using the Automated Photometric Telescopes at Fairborn Observatory show that HD 7924 is photometrically constant over the radial velocity period to 0.19 mmag, supporting the existence of the planetary companion. No transits were detected down to a photometric limit of similar to 0.5 mmag, eliminating transiting planets with a variety of compositions. HD 7924b is one of only eight planets detected by the radial velocity technique with M(P) sini < 10 M(circle plus) and as such is a member of an emerging family of low-mass planets that together constrain theories of planet formation.

引用

页码：75 / 83

页数：9

共 14 条

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