An extrasolar giant planet in an Earth-like orbit - Precise radial velocities of the young star iota Horologii = HR 810

Authors
Kurster, M Endl, M Els, S Hatzes, AP Cochran, WD Dobereiner, S Dennerl, K
Citation
M. Kurster et al., An extrasolar giant planet in an Earth-like orbit - Precise radial velocities of the young star iota Horologii = HR 810, ASTRON ASTR, 353(3), 2000, pp. L33-L36
Citations number
26
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY AND ASTROPHYSICS
ISSN journal
00046361 → ACNP
Volume
353
Issue
3
Year of publication
2000
Pages
L33 - L36
Database
ISI
SICI code
0004-6361(200001)353:3<L33:AEGPIA>2.0.ZU;2-6
Abstract
We present 5 1/2 years of radial velocity (RV) monitoring with the ESO CES of the young (ZAMS) GOV star L Her. We find a Keplerian signal with a perio d of 320.1 d indicative of an orbiting planet with minimum mass m sin 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 extrasola r planets. L Hor is the youngest star with a known planet. In addition to t he planetary signal we find an excess RV scatter of 27.0 ms(-1) rms exceedi ng our measurement precision of 17.4 ms(-1) and probably due to stellar act ivity.