Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...353l..33k&link_type=abstract
Astronomy and Astrophysics, v.353, p.L33-L36 (2000)
Astronomy and Astrophysics
Astrophysics
44
Stars: Planetary Systems, Stars: Individual: Iota Hor, Stars: Rotation, Techniques: Radial Velocities
Scientific paper
We present 5 1/2 years of radial velocity (RV) monitoring with the ESO CES of the young (ZAMS) G0V star iota Hor. We find a Keplerian signal with a period of 320.1 d indicative of an orbiting planet with minimum mass msin i=2.26 M_Jup. With an eccentricity of 0.161 and a semi-major axis of 0.925 AU this object moves in the most Earth-like orbit found so far among extrasolar planets. iota Hor is the youngest star with a known planet. In addition to the planetary signal we find an excess RV scatter of 27.0 ms-1 rms exceeding our measurement precision of 17.4 ms-1 and probably due to stellar activity. Based on observations collected at the European Southern Observatory, La Silla.
Cochran William D.
Dennerl Konrad
Döbereiner Stephan
Els Sebastian
Endl Michael
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