Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-06-21
Astronomy and Astrophysics
Astrophysics
10 pages, 9 figures, Astronomy and Astrophysics, in press
Scientific paper
10.1051/0004-6361:20065445
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.
Cochran William D.
Esposito Massimiliano
Guenther Endl E. M. W.
Hartmann Markus
Hatzes Artie P.
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