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J/A+A/509/A24       Radial velocity curve of γ1 Leo      (Han+, 2010)

Detection of planetary companion around K0 III giant star γ1 Leonis. Han I., Lee B.C., Kim K.M., Mkrtichian D.E., Hatzes A.P., Valyavin G. <Astron. Astrophys. 509, A24 (2010)> =2010A&A...509A..24H
ADC_Keywords: Stars, giant ; Planets ; Radial velocities Keywords: stars: individual: gamma1 Leonis - planetary systems - supergiants Abstract: Our primary goal is to search for planets around intermediate mass stars. We are also interested in studying the nature of radial velocity (RV) variations of K giant stars. We selected about 55 early K giant (K0-K4) stars brighter than fifth magnitude that were observed using BOES, a high resolution spectrograph attached to the 1.8m telescope at BOAO (Bohyunsan Optical Astronomy Observatory). BOES is equipped with I2 absorption cell for high precision RV measurements. We detected a periodic radial velocity variations in the K0 III star gamma1 Leo with a period of P=429-days. An orbital fit of the observed RVs yields a period of P=429-days, a semi-amplitude of K=208m/s, and an eccentricity of e=0.14. To investigate the nature of the RV variations, we analyzed the photometric, Ca II λ 8662 equivalent width, and line-bisector variations of gamma1 Leo. We conclude that the detected RV variations can be best explained by a planetary companion with an estimated mass of msini=8.78M and a semi-major axis of a=1.19AU, assuming a stellar mass of 1.23M. Description: The RV measurements obtained from May 2003 until May 2009 are listed in Table 3. Objects: --------------------------------------------- RA (2000) DE Designation(s) --------------------------------------------- 10 19 58.4 +19 50 29 gamma1 Leo = HR 4057 --------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 32 205 Radial velocity of gamma1 Leo
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 14 F14.6 --- HJD Heliocentric Julian date of the observation 15- 23 F9.4 km/s RV Radial velocity 24- 32 F9.4 km/s e_RV Standard error of RV
Acknowledgements: Inwoo Han,
(End) Inwoo Han [KASI, Korea], Patricia Vannier [CDS] 07-Jan-2010
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