A Long-Period Jupiter-Mass Planet Orbiting the Nearby M Dwarf GJ849

Details A Long-Period Jupiter-Mass Planet Orbiting the Nearby M Dwarf GJ849 A Long-Period Jupiter-Mass Planet Orbiting the Nearby M Dwarf GJ849

2006-10-06

arxiv.org/abs/astro-ph/0610179v2

Astronomy and Astrophysics

Astrophysics

12 pages, 3 figues, 2 tables, PASP Accepted

Scientific paper

10.1086/510500

We report precise Doppler measurements of GJ849 (M3.5V) that reveal the presence of a planet with a minimum mass of 0.82 Mjup in a 5.16 year orbit. At a = 2.35 AU, GJ849b is the first Doppler-detected planet discovered around an M dwarf to orbit beyond 0.21 AU, and is only the second Jupiter mass planet discovered around a star less massive than 0.5 Msun. This detection brings to 4 the number of M stars known to harbor planets. Based on the results of our survey of 1300 FGKM main--sequence stars we find that giant planets within 2.5 AU are ~3 times more common around GK stars than around M stars. Due to the GJ849's proximity of 8.8 pc, the planet's angular separation is 0."27, making this system a prime target for high--resolution imaging using adaptive optics and future space--borne missions such as the Space Interferometry Mission. We also find evidence of a linear trend in the velocity time series, which may be indicative of an additional planetary companion.

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