ar X iv : a st ro - p h / 06 10 17 9 v 1 6 O ct 2 00 6 A Long – period Jupiter – mass Planet Orbiting the Nearby M Dwarf GJ 849
نویسندگان
چکیده
We report precise Doppler measurements of GJ 849 (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, GJ 849 b is the first 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 M⊙. 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 GJ 849’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. Subject headings: techniques: radial velocities—planetary systems: formation— stars: individual (GJ 849) 1 Based on observations obtained at the W.M. Keck Observatory, which is operated jointly by the University of California and the California Institute of Technology. Keck time has been granted by both NASA and the University of California. Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road NW, Washington D.C. USA 20015-1305 Department of Astronomy, University of California, Berkeley, CA USA 94720 Department of Physics and Astronomy, San Francisco State University, San Francisco, CA, USA 94132 UCO/Lick Observatory, University of California at Santa Cruz, Santa Cruz CA USA 95064
منابع مشابه
ar X iv : a st ro - p h / 06 10 17 9 v 2 2 6 O ct 2 00 6 A Long – period Jupiter – mass Planet Orbiting the Nearby M Dwarf GJ 849
We report precise Doppler measurements of GJ 849 (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, GJ 849 b is the first Doppler–detected planet discovered around an M dwarf orbiting beyond 0.21 AU, and is only the second Jupiter–mass planet discovered around a star less massive than 0.5 M⊙. This detection brings to 4 the number ...
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