The exoplanet-host star ι Horologii

An evaporated member of the primordial Hyades cluster

S. Vauclair, M. Laymand, F. Bouchy, G. Vauclair, A. Hui Bon Hoa, S. Charpinet, Michael Bazot

    Research output: Contribution to journalArticle

    Abstract

    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.

    Original languageEnglish (US)
    JournalAstronomy and Astrophysics
    Volume482
    Issue number2
    DOIs
    StatePublished - May 1 2008

    Fingerprint

    extrasolar planets
    stars
    helium
    spectrometer
    acoustics
    planet
    observatory
    oscillation
    accretion
    planetary systems
    European Southern Observatory
    metallicity
    planets
    sun
    spectrometers
    oscillations
    method

    Keywords

    • Galaxy: open cluster and associations: individual: Hyades
    • Stars: abundances
    • Stars: oscillations
    • Stars: planetary systems

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Vauclair, S., Laymand, M., Bouchy, F., Vauclair, G., Hoa, A. H. B., Charpinet, S., & Bazot, M. (2008). The exoplanet-host star ι Horologii: An evaporated member of the primordial Hyades cluster. Astronomy and Astrophysics, 482(2). https://doi.org/10.1051/0004-6361:20079342

    The exoplanet-host star ι Horologii : An evaporated member of the primordial Hyades cluster. / Vauclair, S.; Laymand, M.; Bouchy, F.; Vauclair, G.; Hoa, A. Hui Bon; Charpinet, S.; Bazot, Michael.

    In: Astronomy and Astrophysics, Vol. 482, No. 2, 01.05.2008.

    Research output: Contribution to journalArticle

    Vauclair, S, Laymand, M, Bouchy, F, Vauclair, G, Hoa, AHB, Charpinet, S & Bazot, M 2008, 'The exoplanet-host star ι Horologii: An evaporated member of the primordial Hyades cluster', Astronomy and Astrophysics, vol. 482, no. 2. https://doi.org/10.1051/0004-6361:20079342
    Vauclair, S. ; Laymand, M. ; Bouchy, F. ; Vauclair, G. ; Hoa, A. Hui Bon ; Charpinet, S. ; Bazot, Michael. / The exoplanet-host star ι Horologii : An evaporated member of the primordial Hyades cluster. In: Astronomy and Astrophysics. 2008 ; Vol. 482, No. 2.
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    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.

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    KW - Stars: abundances

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    KW - Stars: planetary systems

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