Retired A Stars and Their Companions. II. Jovian Planets Orbiting κ CrB and HD 167042
Abstract
We report precise Doppler measurements of two stars, obtained at Lick Observatory as part of our search for planets orbiting intermediate-mass subgiants. Periodic variations in the radial velocities of both stars reveal the presence of substellar orbital companions. These two stars are notably massive with stellar masses of 1.80 and 1.64 M_☉, respectively, indicating that they are former A-type dwarfs that have evolved off of the main sequence and are now K-type subgiants. The planet orbiting κ CrB has a minimum mass M_Psin i = 1.8 M_(Jup), eccentricity e = 0.146 and a 1208 day period, corresponding to a semimajor axis a = 2.7 AU. The planet around HD 167042 has a minimum mass M_Psin i = 1.7 M_(Jup) and a 412.6 day orbit, corresponding to a semimajor axis α = 1.3 AU. The eccentricity of HD 167042b is consistent with circular (e = 0.027 ± 0.04), adding to the rare class of known exoplanets in long-period, circular orbits similar to the solar system gas giants. Like all of the planets previously discovered around evolved A stars, κ CrBb and HD 167042b orbit beyond 0.8 AU.
Additional Information
© 2008 American Astronomical Society. Received 2007 September 6; accepted 2007 November 9. We extend our gratitude to the many CAT observers who have helped with this project, including Chris McCarthy, Raj Sareen, Howard Isaacson, Joshua Goldston, Bernie Walp, and Shannon Patel.We also gratefully acknowledge the efforts and dedication of the Lick Observatory staff, and the time assignment committee of the University of California for their generous allocations of observing time. J. A. J. is an NSFAstronomy and Astrophysics Postdoctoral Fellow and acknowledges support from the NSF grant AST 07-02821. We appreciate funding from NASA grant NNG05GK92G (to G. W. M.). D. A. F. is a Cottrell Science Scholar of Research Corporation and acknowledges support from NASA Grant NNG05G164G that made this work possible. P. K. G.W. is supported by an NSF Graduate Research Fellowship. This research has made use of the SIMBAD database operated at CDS, Strasbourg France, and the NASA ADS database.Attached Files
Published - 0004-637X_675_1_784.pdf
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Additional details
- Eprint ID
- 36188
- Resolver ID
- CaltechAUTHORS:20130107-075050826
- NSF
- AST 07-02821
- NASA
- NNG05GK92G
- NASA
- NNG05G164G
- NSF Graduate Research Fellowship
- Created
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2013-01-07Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field