THE NASA-UC-UH ETA-EARTH PROGRAM. IV. A LOW-MASS PLANET ORBITING AN M DWARF 3.6 PC FROM EARTH

被引：76

作者：

Howard, Andrew W. ^{[1
]}

Marcy, Geoffrey W. ^{[2
]}

Fischer, Debra A. ^{[3
]}

Isaacson, Howard ^{[2
]}

Muirhead, Philip S. ^{[4
]}

Henry, Gregory W. ^{[5
]}

Boyajian, Tabetha S. ^{[3
]}

Von Braun, Kaspar ^{[6
,7
]}

Becker, Juliette C. ^{[4
]}

Wright, Jason T. ^{[8
,9
]}

Johnson, John Asher ^{[10
]}

机构：

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

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

[3] Yale Univ, Dept Astron, New Haven, CT 06511 USA

[4] CALTECH, Dept Astrophys, Pasadena, CA 91125 USA

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

[6] CALTECH, NASA, Exoplanet Sci Inst, Pasadena, CA 91125 USA

[7] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[8] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[9] Penn State Univ, Ctr Exoplanets & Habitable Worlds, University Pk, PA 16802 USA

[10] CALTECH, Ctr Planetary Astron, Pasadena, CA 91125 USA

来源：

ASTROPHYSICAL JOURNAL | 2014年 / 794卷 / 01期

基金：

美国国家科学基金会;

关键词：

planetary systems; stars: individual (Gliese 15 A); techniques: radial velocities; EXOPLANET HOST STARS; EXTRA-SOLAR PLANETS; K-BAND SPECTRA; SUN-LIKE STARS; SUPER-EARTH; ASTROPHYSICAL PARAMETERS; HABITABLE ZONE; HARPS SEARCH; TRANSITING PLANET; CHARA ARRAY;

D O I：

10.1088/0004-637X/794/1/51

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of a low-mass planet orbiting Gl 15A based on radial velocities from the Eta-Earth Survey using HIRES at Keck Observatory. Gl 15 Ab is a planet with minimum mass M sin i = 5.35 +/- 0.75M(circle plus), orbital period P = 11.4433 +/- 0.0016 days, and an orbit that is consistent with circular. We characterize the host star using a variety of techniques. Photometric observations at Fairborn Observatory show no evidence for rotational modulation of spots at the orbital period to a limit of similar to 0.1 mmag, thus supporting the existence of the planet. We detect a second RV signal with a period of 44 days that we attribute to rotational modulation of stellar surface features, as confirmed by optical photometry and the Ca II H & K activity indicator. Using infrared spectroscopy from Palomar-TripleSpec, we measure an M2 V spectral type and a sub-solar metallicity ([M/H] = -0.22, [Fe/H] = -0.32). We measure a stellar radius of 0.3863 +/- 0.0021R(circle dot) based on interferometry from CHARA.

引用

页数：9

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