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Alexander Mustill. Profile picture.

Alexander Mustill

Researcher

Alexander Mustill. Profile picture.

Detailed chemical compositions of the wide binary HD 80606/80607 : Revised stellar properties and constraints on planet formation

Author

  • F. Liu
  • D. Yong
  • M. Asplund
  • S. Feltzing
  • A. J. Mustill
  • J. Meléndez
  • I. Ramírez
  • J. Lin

Summary, in English

Differences in the elemental abundances of planet-hosting stars in binary systems can give important clues and constraints about planet formation and evolution. In this study we performed a high-precision, differential elemental abundance analysis of a wide binary system, HD 80606/80607, based on high-resolution spectra with high signal-to-noise ratio obtained with Keck/HIRES. HD 80606 is known to host a giant planet with the mass of four Jupiters, but no planet has been detected around HD 80607 so far. We determined stellar parameters as well as abundances for 23 elements for these two stars with extremely high precision. Our main results are that (i) we confirmed that the two components share very similar chemical compositions, but HD 80606 is marginally more metal-rich than HD 80607, with an average difference of +0.013 ± 0.002 dex (σ = 0.009 dex); and (ii) there is no obvious trend between abundance differences and condensation temperature. Assuming that this binary formed from material with the same chemical composition, it is difficult to understand how giant planet formation could produce the present-day photospheric abundances of the elements we measure. We cannot exclude the possibility that HD 80606 might have accreted about 2.5 to 5 MEarth material onto its surface, possibly from a planet destabilised by the known highly eccentric giant.

Department/s

  • Lund Observatory

Publishing year

2018-06-01

Language

English

Publication/Series

Astronomy and Astrophysics

Volume

614

Document type

Journal article

Publisher

EDP Sciences

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Binaries: general
  • Planets and satellites: formation
  • Stars: abundances
  • Stars: atmospheres
  • Stars: individual: HD 80606, HD 80607

Status

Published

Project

  • The New Milky Way
  • IMPACT: Comets, asteroids and the habitability of planets

ISBN/ISSN/Other

  • ISSN: 0004-6361