M2K: I. A Jovian mass planet around the M3V star HIP79431

astro-ph.EP

/ Authors

Kevin Apps, Kelsey I. Clubb, Debra A. Fischer, Eric Gaidos, Andrew W. Howard, John A. Johnson, Geoffrey W. Marcy, Howard Isaacson, Matthew J. Giguere, Jeff A. Valenti

and 3 more authors

Victor Rodriguez, Carley Chubak, Sebastian Lepine

/ Abstract

Doppler observations from Keck Observatory reveal the presence of a planet with Msini of 2.1 Mjup orbiting the M3V star HIP79431. 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.