A Planet in a 0.6-AU Orbit Around the K0 Giant HD 102272

Abstract

We report the discovery of one or more planet-mass companions to the K0-giant HD 102272 with the Hobby-Eberly Telescope. In the absence of any correlation of the observed periodicities with the standard indicators of stellar activity, the observed radial velocity variations are most plausibly explained in terms of a Keplerian motion of at least one planet-mass body around the star. With the estimated stellar mass of 1.9M${}_{\odot }$, the minimum mass of the confirmed planet is 5.9M${}_J$. The planet's orbit is characterized by a small but nonzero eccentricity of $e$=0.05 and the semi-major axis of 0.61 AU, which makes it the most compact one discovered so far around GK-giants. This detection adds to the existing evidence that, as predicted by theory, the minimum size of planetary orbits around intermediate-mass giants is affected by both planet formation processes and stellar evolution. The currently available evidence for another planet around HD 102272 is insufficient to obtain an unambiguous two-orbit solution.

10 pages, 5 figures

References in corpus (10)

• Planet formation around stars of various masses: The snow line and the frequency of giant planets
• A New Planet Around an M Dwarf: Revealing a Correlation Between Exoplanets and Stellar Mass
• Retired A Stars and Their Companions: Exoplanets Orbiting Three Intermediate-Mass Subgiants
• Planets around evolved intermediate-mass stars. I. Two substellar companions in the open clusters NGC 2423 and NGC 4349
• Confirmation of the Planet Hypothesis for the Long-period Radial Velocity Variations of Beta Geminorum
• A Planetary Mass Companion to the K0 Giant HD 17092
• Precise radial velocities of giant stars: I. Stable stars
• Precise radial velocities of giant stars. IV. A correlation between surface gravity and radial velocity variation and a statistical investigation of companion properties
• Line bisectors and radial velocity jitter from SARG spectra
• Testing planet formation theories with Giant stars

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