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arXiv · 1007.4555

A hot Jupiter orbiting the 1.7 Msun Subgiant HD102956

John Asher Johnson·Brendan P. Bowler·Andrew W. Howard·Gregory W. Henry·Geoffrey W. Marcy·Howard Isaacson·John Michael Brewer·Debra A. Fischer·Timothy D. Morton·Justin R. Crepp
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Abstract

We report the detection of a giant planet in a 6.4950 day orbit around the 1.7 Msun subgiant HD102956. The planet has a semimajor axis a = 0.081 AU and minimum mass Msini = 0.96 Mjup. HD102956 is the most massive star known to harbor a hot Jupiter, and its planet is only the third known to orbit within 0.6 AU of a star more massive than 1.5 Msun. Based on our sample of 137 subgiants with M* > 1.45 Msun we find that 0.5-2.3% of A-type stars harbor a close-in planet (a < 0.1 AU) with Msini > 1 Mjup, consistent with hot-Jupiter occurrence for Sun-like stars. Thus, the paucity of planets with 0.1 < a/AU < 1.0 around intermediate-mass stars may be an exaggerated version of the "period valley" that is characteristic of planets around Sun-like stars.

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John Asher Johnson, Brendan P. Bowler, Andrew W. Howard, Gregory W. Henry, Geoffrey W. Marcy, Howard Isaacson, John Michael Brewer, Debra A. Fischer, Timothy D. Morton, Justin R. Crepp. 2010-09-14. A hot Jupiter orbiting the 1.7 Msun Subgiant HD102956. https://doi.org/10.1088/2041-8205%2F721%2F2%2Fl153

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