Astrophysics, abstract
astro-ph/0606517
From: Artie Hatzes [view email]
Date: Wed, 21 Jun 2006 12:43:24 GMT (112kb)
Confirmation of the Planet Hypothesis for the Long-period Radial Velocity Variations of Beta Geminorum
Authors: A.P. Hatzes, W.D. Cochran, M. Endl E.W. Guenther, S.H. Saar, G.A.H. Walker, S. Yang, M. Hartmann, M. Esposito, D.B. Paulson
Comments: 10 pages, 9 figures, Astronomy and Astrophysics, in press
We present precise stellar radial velocity measurements for the K giant star Beta Gem spanning over 25 years. These data show that the long period low amplitude radial velocity variations found by Hatzes & Cochran (1993) are long-lived and coherent. An examination of the Ca II K emission, spectral line shapes from high resolution data (R = 210,000), and Hipparcos photometry show no significant variations of these quantities with the RV period. These data confirm the planetary companion hypothesis suggested by Hatzes & Cochran (1993). An orbital solution assuming a stellar mass of 1.7 M_sun yields a period, P = 589.6 days, a minimum mass of 2.3 M_Jupiter, and a semi-major axis, and a = 1.6 AU. The orbit is nearly circular (e = 0.02). Beta Gem is the seventh intermediate mass star shown to host a sub-stellar companion and suggests that planet-formation around stars much more massive than the sun may common.
http://arxiv.org/abs/astro-ph/0606517
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Confirmation of the Planet Hypothesis for the Long-period Radial Velocity Variations of Beta Geminorum
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