TY - JOUR
T1 - The exoplanet-host star ι Horologii
T2 - An evaporated member of the primordial Hyades cluster
AU - Vauclair, S.
AU - Laymand, M.
AU - Bouchy, F.
AU - Vauclair, G.
AU - Hoa, A. Hui Bon
AU - Charpinet, S.
AU - Bazot, M.
PY - 2008/5
Y1 - 2008/5
N2 - Aims. We show that the exoplanet-host star iota Horologii, alias HD 17051, which belongs to the so-called Hyades stream, was formed within the primordial Hyades stellar cluster and has evaporated towards its present location, 40 pc away.Methods. This result has been obtained unambiguously by studying the acoustic oscillations of this star, using the HARPS spectrometer in La Silla Observatory (ESO, Chili).Results. Besides the fact that Hor belongs to the Hyades stream, we give evidence that it has the same metallicity, helium abundance, and age as the other stars of the Hyades cluster. They were formed together, at the same time, in the same primordial cloud.Conclusions. This result has strong implications for theories of stellar formation. It also indicates that the observed overmetallicity of this exoplanet-host star, about twice that of the Sun, is original and not caused by planet accretion during the formation of the planetary system.
AB - Aims. We show that the exoplanet-host star iota Horologii, alias HD 17051, which belongs to the so-called Hyades stream, was formed within the primordial Hyades stellar cluster and has evaporated towards its present location, 40 pc away.Methods. This result has been obtained unambiguously by studying the acoustic oscillations of this star, using the HARPS spectrometer in La Silla Observatory (ESO, Chili).Results. Besides the fact that Hor belongs to the Hyades stream, we give evidence that it has the same metallicity, helium abundance, and age as the other stars of the Hyades cluster. They were formed together, at the same time, in the same primordial cloud.Conclusions. This result has strong implications for theories of stellar formation. It also indicates that the observed overmetallicity of this exoplanet-host star, about twice that of the Sun, is original and not caused by planet accretion during the formation of the planetary system.
KW - Galaxy: open cluster and associations: individual: Hyades
KW - Stars: abundances
KW - Stars: oscillations
KW - Stars: planetary systems
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U2 - 10.1051/0004-6361:20079342
DO - 10.1051/0004-6361:20079342
M3 - Article
AN - SCOPUS:42349095010
SN - 0004-6361
VL - 482
SP - L5-L8
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
IS - 2
ER -