A Planetary Companion to the Nearby M4 Dwarf, Gliese 876

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dc.creatorMarcy, G. W.
dc.creatorButler, R. P.
dc.creatorVogt, S. S.
dc.creatorFischer, D. A.
dc.creatorLissauer, J. J.
dc.date1998-07-29
dc.date.accessioned2026-07-07T12:01:07Z
dc.date.available2026-07-07T12:01:07Z
dc.descriptionDoppler measurements of the M4 dwarf star, Gliese 876, taken at both Lick and Keck Observatory reveal periodic, Keplerian velocity variations with a period of 61 days. The orbital fit implies that the companion has a mass of, M = 2.1 MJUP /sin i, an orbital eccentricity of, e = 0.27+-0.03, and a semimajor axis of, a = 0.21 AU. The planet is the first found around an M dwarf, and was drawn from a survey of 24 such stars at Lick Observatory. It is the closest extrasolar 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_Sun star, presents a challenge to planet formation theory. This planet detection around an M dwarf suggests that giant planets are numerous in the Galaxy.
dc.description13 pages, 3 Figures
dc.identifierhttps://arxiv.org/abs/astro-ph/9807307
dc.identifierhttp://arxiv.org/abs/astro-ph/9807307
dc.identifierAstrophys.J.505:L147-L149,1998
dc.identifierdoi:10.1086/311623
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/206999
dc.subjectAstrophysics
dc.titleA Planetary Companion to the Nearby M4 Dwarf, Gliese 876
dc.typetext

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