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To detect exoplanets and study pulsation of K giant stars, we have observed precise RV (radial velocity) of about 55 early K giant (KO - K4) stars brighter than V = 5 magnitude since 2003 by using BOES, a high resolution Echelle spectrograph attached to the 1.8 m telescope at BOAO (Bohyunsan Optical Astronomy Observatory). We detected periodic RV variation of KO III star β Gem (HD 62509) with a period P = 596.6 ± 2.3 days and a semi-amplitude K = 44.8 ± 0.7 ms -1 . If we adopt 1.7 M ⊙ for the mass of β Gem, this yields the minimum mass of the companion m sin i = 2.64 M Jupiter . Our results agree well with Hatzes et al. (2006) and Reffert et al. (2006), and confirm their discovery of a planetary object around β Gem. We also confirmed about 192 minutes short period stellar oscillation found by Hatzes and Zec;hmeister (2007). This is the first report of exoplanet detection using BOES and demonstrates that the RV observation using BOES is accurate and stable enough to detect exoplanets around bright K giant stars.

CONFIRMATION OF THE EXOPLANET AROUND β GEM FROM THE RV OBSERVATIONS USING BOES