M2K: I. A Jupiter-Mass Planet Orbiting the M3V Star HIP 79431

Creators: Apps, Kevin; Clubb, Kelsey I.; Fischer, Debra A.; Gaidos, Eric; Howard, Andrew; Johnson, John A.; Marcy, Geoffrey W.; Isaacson, Howard; Giguere, Matthew J.; Valenti, Jeff A.; Rodriguez, Victor; Chubak, Carly; Lépine, Sébastien

Abstract

Doppler observations from Keck Observatory reveal the presence of a planet with M sin i of 2.1 M_(Jup) orbiting the M3V star HIP 79431. This is the sixth giant planet to be detected in Doppler surveys of M dwarfs and it is one of the most massive planets discovered around an M dwarf star. The planet has an orbital period of 111.7 days and an orbital eccentricity of 0.29. The host star is metal rich, with an estimated [Fe/H] = +0.4. This is the first planet to emerge from our new survey of 1600 M-to-K dwarf stars.

Additional Information

© 2010 The Astronomical Society of the Pacific. Received 2009 December 10; accepted 2009 December 28; published 2010 January 12. We gratefully acknowledge the dedication and support of the Keck Observatory staff, especially Grant Hill and Scott Dahm for support of HIRES and Greg Wirth for support of remote observing. D. A. F. acknowledges research support from NASA grant NNX08AF42G as well as NASA support through the Keck PI Data Analysis Fund. E. G. acknowledges support by NSF grant AST0908419. A. W. H. gratefully acknowledges support from a Townes Postdoctoral Fellowship at the University of California, Berkeley Space Sciences Laboratory. Data presented herein were obtained at the W. M. Keck Observatory from telescope time allocated to the National Aeronautics and Space Administration through the agency's scientific partnership with the California Institute of Technology and the University of California. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community.We are most fortunate to have the opportunity to conduct observations from this mountain.We also thank the University of Hawaii TAC for allocation of telescope time. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France, and of NASA's Astrophysics Data System Bibliographic Services.

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