View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Caltech Authors The Astrophysical Journal, 709:396–410, 2010 January 20 doi:10.1088/0004-637X/709/1/396 C 2010. The American Astronomical Society. All rights reserved. Printed in the U.S.A. RETIRED A STARS AND THEIR COMPANIONS. III. COMPARING THE MASS–PERIOD DISTRIBUTIONS OF PLANETS AROUND A-TYPE STARS AND SUN-LIKE STARS∗ Brendan P. Bowler1, John Asher Johnson1,7, Geoffrey W. Marcy2, Gregory W. Henry3, Kathryn M. G. Peek2, Debra A. Fischer4, Kelsey I. Clubb4, Michael C. Liu1, Sabine Reffert5, Christian Schwab5, and Thomas B. Lowe6 1 Institute for Astronomy, University of Hawai‘i, 2680 Woodlawn Drive, Honolulu, HI 96822, USA;
[email protected] 2 Department of Astronomy, University of California, MS 3411, Berkeley, CA 94720-3411, USA 3 Center of Excellence in Information Systems, Tennessee State University, 3500 John A. Merritt Blvd., Box 9501, Nashville, TN 37209, USA 4 Department of Physics and Astronomy, San Francisco State University, San Francisco, CA 94132, USA 5 ZAH-Landessternwarte, Konigstuhl¨ 12, 69117 Heidelberg, Germany 6 UCO/Lick Observatory, Santa Cruz, CA 95064, USA Received 2009 June 10; accepted 2009 December 3; published 2009 December 31 ABSTRACT We present an analysis of ∼5 years of Lick Observatory radial velocity measurements targeting a uniform sample of 31 intermediate-mass (IM) subgiants (1.5 M∗/M 2.0) with the goal of measuring the occurrence rate of Jovian planets around (evolved) A-type stars and comparing the distributions of their orbital and physical characteristics to those of planets around Sun-like stars.