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Retired A Stars and Their Companions II: Jovian planets orbiting kappa Coronae Borealis and HD167042 | | John A. Johnson
; Geoffrey W. Marcy
; Debra A. Fischer
; Jason T. Wright
; Sabine Reffert
; Julia M. Kregenow
; Peter K. G. Williams
; Kathryn M. G. Peek
; | | Date: |
28 Nov 2007 | | Abstract: | We report precise Doppler measurements of two evolved stars, kappa CrB
(HD142091) and HD 167042, 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
Msun and 1.64 Msun, 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 kappa CrB has a minimum mass Msini = 1.8 Mjup, eccentricity e = 0.146
and a 1208 day period, corresponding to a semimajor axis of 2.7 AU. The planet
around HD167042 has a minimum mass Msini = 1.7 Mjup and a 412.6 day orbit,
corresponding to a semimajor axis of 1.3 AU. The eccentricity of HD167042b 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,
kappa CrBb and HD167042b orbit beyond 0.8 AU. | | Source: | arXiv, 0711.4367 | | Services: | Forum | Review | PDF | Favorites | |
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