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.
@article{arxiv.1007.4555,
title = {A hot Jupiter orbiting the 1.7 Msun Subgiant HD102956},
author = {John Asher Johnson and Brendan P. Bowler and Andrew W. Howard and Gregory W. Henry and Geoffrey W. Marcy and Howard Isaacson and John Michael Brewer and Debra A. Fischer and Timothy D. Morton and Justin R. Crepp},
journal= {arXiv preprint arXiv:1007.4555},
year = {2015}
}
Comments
ApJL, 721, L153. Title changed because ApJL does not publish papers that are part of a series