The California Planet Survey II. A Saturn-Mass Planet Orbiting the M Dwarf Gl649
John Asher Johnson, Andrew W. Howard, Geoffrey W. Marcy, Brendan P., Bowler, Gregory W. Henry, Debra A. Fischer, Kevin Apps, Howard Isaacson,, Jason T. Wright

TL;DR
This paper reports the discovery of a Saturn-mass planet orbiting the M dwarf Gl649, providing new insights into planet formation around low-mass stars and refining the occurrence rate of giant planets in such systems.
Contribution
It presents the detection of a new giant planet around an M dwarf and updates the occurrence rate of such planets around low-mass stars.
Findings
Discovery of a Saturn-mass planet orbiting Gl649.
Occurrence rate of giant planets around M dwarfs is approximately 3.4%.
Higher occurrence rate (~10.7%) around metal-rich M dwarfs.
Abstract
We report precise Doppler measurements of the nearby (d = 10.34 pc) M dwarf Gl649 that reveal the presence of a planet with a minimum mass Msini = 0.328 Mjup in an eccentric (e = 0.30), 598.3 day orbit. Our photometric monitoring reveals Gl649 to be a new variable star with brightness changes on both rotational and decadal timescales. However, neither of these timescales are consistent with the 600-day Doppler signal and so provide strong support for planetary reflex motion as the best interpretation of the observed radial velocity variations. Gl649b is only the seventh Doppler-detected giant planet around an M dwarf. The properties of the planet and host-star therefore contribute significant information to our knowledge of planet formation around low-mass stars. We revise and refine the occurrence rate of giant planets around M dwarfs based on the California Planet Survey sample of…
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