A Planetary Companion to a Nearby M4 Dwarf, Gliese 876 | Zendy

Geoffrey W. Marcy | Zendy; R. Paul Butler | Zendy; Steven S. Vogt | Zendy; Debra A. Fischer | Zendy; Jack J. Lissauer | Zendy

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A Planetary Companion to a Nearby M4 Dwarf, Gliese 876

Author(s) -

Geoffrey W. Marcy,

R. Paul Butler,

Steven S. Vogt,

Debra A. Fischer,

Jack J. Lissauer

Publication year - 1998

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/311623

Subject(s) - physics , planet , exoplanet , circumbinary planet , astrophysics , astronomy , brown dwarf

Doppler measurements of the M4 dwarf star, Gliese 876, taken at both Lick andKeck Observatory reveal periodic, Keplerian velocity variations with a periodof 61 days. The orbital fit implies that the companion has a mass of, M = 2.1MJUP /sin i, an orbital eccentricity of, e = 0.27+-0.03, and a semimajor axisof, a = 0.21 AU. The planet is the first found around an M dwarf, and was drawnfrom a survey of 24 such stars at Lick Observatory. It is the closestextrasolar planet yet found, providing opportunities for follow--up detection.The presence of a giant planet on a non-circular orbit, 0.2 AU from a 1/3 M_Sunstar, presents a challenge to planet formation theory. This planet detectionaround an M dwarf suggests that giant planets are numerous in the Galaxy.Comment: 13 pages, 3 Figure

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