A Hot Jupiter Orbiting the 1.7 M ⊙ Subgiant HD 102956

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

Abstract

We report the detection of a giant planet in a 6.4950 day orbit around the 1.68 M ⊙ subgiant HD 102956. The planet has a semimajor axis a = 0.081 AU and a minimum mass M_P sin i =0.96 M_(Jup). HD 102956 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 M ⊙. Based on our sample of 137 subgiants with M_* > 1.45 M ⊙, we find that 0.5%-2.3% of A-type stars harbor a close-in planet (a < 0.1 AU) with M_P sin i > 1 M_(Jup), consistent with hot-Jupiter occurrence for Sun-like stars. Thus, the paucity of planets with 0.1 AU < a < 1.0 AU around intermediate-mass stars may be an exaggerated version of the "period valley" that is characteristic of planets around Sun-like stars.

Additional Information

© 2010 The American Astronomical Society. Received 2010 June 21; accepted 2010 August 26; published 2010 September 10. Based on observations obtained at the W. M. Keck Observatory, which is operated jointly by the University of California and the California Institute of Technology. Keck time has been granted by both NASA and the University of California. We gratefully acknowledge the efforts and dedication of the Keck Observatory staff, especially Grant Hill, Scott Dahm, and Hien Tran for their support of HIRES, and Greg Wirth for support of remote observing. We are also grateful to the time assignment committees of NASA, NOAO, Caltech, and the University of California for their generous allocations of observing time. A.W.H. gratefully acknowledges support from a Townes Post-doctoral Fellowship at the U. C. Berkeley Space Sciences Laboratory. G.W.M. acknowledges NASA grant NNX06AH52G. G.W.H acknowledges support from NASA, NSF, Tennessee State University, and the State of Tennessee through its Centers of Excellence program. Finally, the authors wish to extend special thanks to those of Hawaiian ancestry on whose sacred mountain of Mauna Kea we are privileged to be guests. Without their generous hospitality, the Keck observations presented herein would not have been possible.

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