Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...586.1394f&link_type=abstract
The Astrophysical Journal, Volume 586, Issue 2, pp. 1394-1408.
Astronomy and Astrophysics
Astronomy
71
Stars: Planetary Systems, Stars: Individual: Henry Draper Number: Hd 12661, Stars: Individual: Henry Draper Number: Hd 38529, Stars: Individual: Henry Draper Number: Hd 40979, Stars: Low-Mass, Brown Dwarfs
Scientific paper
We report the detection of three extrasolar planets from the Lick and Keck observatories. The F8 V star HD 40979 has a companion with orbital period P=263.1+/-3 days, eccentricity e=0.25+/-0.05, and velocity semiamplitude K=101.2+/-5.6 m s-1. The inferred semimajor axis is 0.83 AU and Msini=3.28MJup. Observations of planetary companions orbiting the G6 V star HD 12661 and the G4 IV star HD 38529 have already been published, and here we report additional, longer period companions for both of these stars. The outer companion to HD 12661 has Pc=1444.5+/-12.5 days, ec=0.20+/-0.04, and Kc=27.6+/-2.5 m s-1. Adopting a stellar mass of 1.07 Msolar, we find Mcsini=1.57MJup and a semimajor axis of 2.56 AU. The second companion to HD 38529 has Pc=2174+/-30 days, ec=0.36+/-0.05, and Kc=170.5+/-9 m s-1. The assumed mass of 1.39 Msolar for HD 38529 yields Mcsini=12.7MJup and a semimajor axis of 3.68 AU. Photometric observations at Fairborn Observatory reveal low-amplitude brightness variations in HD 40979 and HD 38529 due to rotational modulation in the visibility of photospheric starspots, and they yield rotation periods of 7.0 and 35.7 days, respectively, very different from the planetary orbital periods. The orbital parameters of these two systems are compared with updated parameters for all of the known multiple-planet systems. Updated velocities are provided for the Υ Andromedae system.
Based on observations obtained at Lick Observatory, which is operated by the University of California, and 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.
Butler Paul R.
Fischer Debra Ann
Henry Gregory W.
Marcy Geoffrey W.
Misch Anthony A.
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