Giant planet occurrence within 0.2 AU of low-luminosity red giant branch stars with K2

Abstract

Every Sun-like star will eventually evolve into a red giant, a transition which can profoundly affect the evolution of a surrounding planetary system. The timescale of dynamical planet evolution and orbital decay has important implications for planetary habitability, as well as post-main sequence star and planet interaction, evolution and internal structure. Here, we investigate these effects by estimating planet occurrence around 2476 low-luminosity red giant branch (LLRGB) stars observed by the NASA K2 mission. We measure stellar masses and radii using asteroseismology, with median random uncertainties of 3.7% in mass and 2.2% in radius. We compare this planet population to the known population of planets around dwarf Sun-like stars, accounting for detection efficiency differences between the stellar populations. We find that 0.51% +/- 0.29% of LLRGB stars host planets larger than Jupiter with orbital periods less than 10 days, tentatively higher than main sequence stars hosting similar planets (0.15% +/- 0.06%). Our results suggest that the effects of stellar evolution on the occurrence of close-in planets larger than Jupiter is not significant until stars have begun ascending substantially up the red giant branch (>~ 5-6 Rsun).

15 pages, 10 figures, accepted for publication in ApJ, please email [email protected] for complete machine-readable version of Table 1

References in corpus (19)

• The K2 Mission: Characterization and Early results
• A Technique for Extracting Highly Precise Photometry for the Two-Wheeled Kepler Mission
• The Radial Velocity Experiment (RAVE): Fifth Data Release
• A new implementation of the infrared flux method using the 2MASS catalogue
• Asteroseismology and Gaia: Testing Scaling Relations Using 2200 Kepler Stars with TGAS Parallaxes
• Precise Radial Velocities of Giant Stars VII. Occurrence Rate of Giant Extrasolar Planets as a Function of Mass and Metallicity
• EVEREST: Pixel Level Decorrelation of K2 Light curves
• Hot Jupiters and Cool Stars
• The asteroseismic potential of TESS: exoplanet-host stars
• A Hot Saturn Orbiting An Oscillating Late Subgiant Discovered by TESS
• Radial Velocity Observations and Light Curve Noise Modeling Confirm That Kepler-91b is a Giant Planet Orbiting a Giant Star
• Seeing double with K2: Testing re-inflation with two remarkably similar planets around red giant branch stars
• Detection of Stars within $\sim$0.8 arcseconds of Kepler Objects of Interest
• The K2 Galactic Archaeology Program Data Release 1: Asteroseismic results from Campaign 1
• The occurrence of planets and other substellar bodies around white dwarfs using K2
• The angular sizes of dwarf stars and subgiants - Non-linear surface brightness relations in BVRcIc from interferometry
• Stellar Metallicity of the Extended Disk and Distance of the Spiral Galaxy NGC 3621
• Radial velocity confirmation of Kepler-91 b. Additional evidence of its planetary nature using the Calar Alto/CAFE instrument
• Asteroseismology of 1523 misclassified red giants using $\text{Kepler}$ data

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• Constraining the Planet Occurrence Rate around Halo Stars of Potentially Extragalactic Origin
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• A Close-in Planet Orbiting Giant Star HD 167768
• Spitzer phase curve observations and circulation models of the inflated ultra-hot Jupiter WASP-76b
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