THREE WIDE PLANETARY-MASS COMPANIONS to FW TAU, Roxs 12, and Roxs 42B
The Astrophysical Journal, 781:20 (16pp), 2014 January 20 doi:10.1088/0004-637X/781/1/20 C 2014. The American Astronomical Society. All rights reserved. Printed in the U.S.A. THREE WIDE PLANETARY-MASS COMPANIONS TO FW TAU, ROXs 12, AND ROXs 42B Adam L. Kraus1,2, Michael J. Ireland3,4, Lucas A. Cieza5,6, Sasha Hinkley7, Trent J. Dupuy2, Brendan P. Bowler5,7, and Michael C. Liu5 1 Department of Astronomy, The University of Texas at Austin, Austin, TX 78712, USA 2 Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA 3 Department of Physics and Astronomy, Macquarie University, NSW 2109, Australia 4 Australian Astronomical Observatory, P.O. Box 296, Epping NSW 1710, Australia 5 Institute for Astronomy, University of Hawaii, 2680 Woodlawn Dr., Honolulu, HI 96822, USA 6 Universidad Diego Portales, Facultad de Ingeniera, Av. Ejercito´ 441, Santiago, Chile 7 Department of Astronomy, California Institute of Technology, 1200 E. California Blvd., MC 249-17, Pasadena, CA 91125, USA Received 2012 December 21; accepted 2013 November 28; published 2013 December 31 ABSTRACT We report the discovery of three planetary-mass companions (M = 6–20 MJup) in wide orbits (ρ ∼ 150–300 AU) around the young stars FW Tau (Taurus-Auriga), ROXs 12 (Ophiuchus), and ROXs 42B (Ophiuchus). All three wide planetary-mass companions (PMCs) were reported as candidate companions in previous binary survey programs, but then were neglected for >10 yr. We therefore obtained followup observations that demonstrate that each candidate is comoving with its host star. Based on the absolute MK magnitudes, we infer masses (from hot-start evolutionary models) and projected separations of 10 ± 4 MJup and 330 ± 30 AU for FW Tau b, 16 ± 4 MJup and 210 ± 20 AU for ROXs 12, and 10 ± 4 MJup and 140 ± 10 AU for ROXs 42B b.
[Show full text]