Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...398l..19s&link_type=abstract
Astronomy and Astrophysics, v.398, p.L19-L23 (2003)
Astronomy and Astrophysics
Astrophysics
55
Stars: Late-Type, Stars: Individual: Hd 47536, Technique: Radial Velocities, Stars: Planetary Systems
Scientific paper
We report evidence of a low-mass companion around the K1III giant star HD 47536. This star belongs to our sample of 83 subgiant and giant stars studied for their radial velocity variations using the FEROS spectrograph at the 1.52 m-ESO telescope on La Silla. We find that the radial velocity of HD 47536 exhibits a periodic variation of about 712 days with a semi-amplitude of 113 m s-1. These variations are not accompanied by variations in either Ca II emission or in the spectral line shapes. A Keplerian orbit due to a sub-stellar companion is thus the most viable explanation for the radial velocity variation. Assuming a moderate stellar mass of m1= 1.1-3.0 Msun we obtain a minimum mass for the companion of m2 sin i= 5.0-9.7 MJup, an orbital semi-major axis of 1.6-2.3 AU, and an eccentricity of e=0.2.
Based on observations collected at the ESO 1.52m telescope at the La Silla Observatory from July 2000 to February 2002 under ESO programs and the ESO-Observatório Nacional, Brazil, agreement.
da Silva Loureiro L.
Girardi Leo
Hatzes Artie P.
Naef Dominique
Pasquini Luca
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