The exoplanet-host star iota Horologii: an evaporated member of the primordial Hyades cluster

Abstract

We show that the exoplanet-host star iota Horologii, alias HD17051, 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. This result has been obtained unambiguously by studying the acoustic oscillations of this star, using the HARPS spectrometer in La Silla Observatory (ESO, Chili). Besides the fact that $\iota$ 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. 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.

arXiv commentto be published in A&A letters

References in corpus (15)

• The Geneva-Copenhagen survey of the Solar neighbourhood: Ages, metallicities, and kinematic properties of 14,000 F and G dwarfs
• Spectroscopic [Fe/H] for 98 extra-solar planet-host stars: Exploring the probability of planet formation
• Late-type stars members of young stellar kinematic groups - I. Single stars
• Systematic effects and a new determination of the primordial abundance of 4He and dY/dZ from observations of blue compact galaxies
• Parent Stars of Extrasolar Planets VI: Abundance Analyses of 20 New Systems
• Statistical properties of exoplanets II. Metallicity, orbital parameters, and space velocities
• Spectroscopic metallicities for planet-host stars: extending the samples
• Metallic fingers and metallicity excess in exoplanets host stars : the accretion hypothesis revisited
• Asteroseismology of the planet-hosting star $\mu$ Arae. I. The acoustic spectrum
• The distribution of nearby stars in phase space mapped by Hipparcos III. Clustering and streaming among A-F type stars
• The Hyades stream: evaporated cluster or intrusion from the inner disk?
• The Helium content and age of the Hyades: Constraints from five binary systems and Hipparcos parallaxes
• The Distances to Open Clusters from Main-Sequence Fitting. I. New Models and a Comparison to the Properties of the Hyades Eclipsing Binary vB 22
• Asteroseismology of exoplanets hosts stars : tests of internal metallicity
• Asteroseismology of exoplanets host stars: the special case of $\iota$ Horologii (HD17051)

Cited by in corpus (41)

• Asteroseismology of Solar-Type and Red-Giant Stars
• Fundamental Properties of Kepler Planet-Candidate Host Stars using Asteroseismology
• The relation between $\Delta \nu$ and ${\nu }_{max}$ for solar-like oscillations
• Accurate fundamental parameters for 23 bright solar-type stars
• An ancient extrasolar system with five sub-Earth-size planets
• Asteroseismic determination of obliquities of the exoplanet systems Kepler-50 and Kepler-65
• A precise asteroseismic age and radius for the evolved Sun-like star KIC 11026764
• Discovery of a 1.6-year Magnetic Activity Cycle in the Exoplanet Host Star iota Horologii
• Accurate p-mode measurements of the G0V metal-rich CoRoT target HD 52265
• Evolution of coexisting long and short period stellar activity cycles
• Elemental abundances of low-mass stars in nearby young associations: AB Doradus, Carina Near, and Ursa Major
• A large sample of calibration stars for Gaia: log g from Kepler and CoRoT
• The planet search programme at the ESO CES and HARPS. IV. The search for Jupiter analogues around solar-like stars
• Calibrating the metallicity of M dwarfs in wide physical binaries with F-, G-, and K- primaries - I: High-resolution spectroscopy with HERMES: stellar parameters, abundances, and kinematics
• A 20-Second Cadence View of Solar-Type Stars and Their Planets with TESS: Asteroseismology of Solar Analogs and a Re-characterization of pi Men c
• Limits on surface gravities of Kepler planet-candidate host stars from non-detection of solar-like oscillations
• A critical reassessment of the fundamental properties of GJ 504: Chemical composition and age
• The chemical composition of nearby young associations: s-process element abundances in AB Doradus, Carina-Near, and Ursa Major
• The age-mass-metallicity-activity relation for solar-type stars: Comparisons with asteroseismology and the NGC 188 open cluster
• Assessing the accuracy of the gravity determination in late-type stars with solar-like pulsators
• iota Horologi, the first coronal activity cycle in a young solar-like star
• Lithium abundances in exoplanet-host stars : modelling
• The Discovery of Stellar Oscillations in the K Giant $\iota$ Dra
• HD 46375: seismic and spectropolarimetric analysis of a young Sun hosting a Saturn-like planet
• Precise Modeling of the Exoplanet Host Star and CoRoT Main Target HD 52265
• Multi-wavelength variability of the young solar analog iota Hor. X-ray cycle, star spots, flares, and UV emission
• A possible long-term activity cycle for ι Horologii: First results from the HKα & SPI-HKα projects
• New seismic analysis of the exoplanet-host star Mu Arae
• Asteroseismology of solar-type stars: signatures of convective and/or helium cores
• Far beyond the Sun: I. The beating magnetic heart in Horologium
• The asteroseismic potential of CHEOPS
• Luminaries in the Sky: The TESS Legacy Sample of Bright Stars. I. Asteroseismic detections in naked-eye main-sequence and sub-giant solar-like oscillators
• Uncertainties and biases in modelling 16 Cyg A and B
• Far beyond the Sun: II. Probing the stellar magnetism of the young Sun ι Horologii from the photosphere to its corona
• Presupernova Structure of Massive Stars
• The age of the Galaxy's thick disk
• Pulsating stars harbouring planets
• Correlating Intrinsic Stellar Parameters with Mg II Self-Reversal Depths
• iota Horologii is unlikely to be an evaporated Hyades star
• Far beyond the Sun: III. The magnetic cycle of $\mathbf{\iota }$ Horologii
• The effects of stellar activity cycles on planetary atmospheric escape and the HeI 1083nm transit signature