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Sofia Feltzing

Professor

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The Gaia-ESO Survey : Revisiting the Li-rich giant problem

Författare

  • A. R. Casey
  • G. Ruchti
  • T. Masseron
  • S. Randich
  • G. Gilmore
  • K. Lind
  • G. M. Kennedy
  • S. E. Koposov
  • A. Hourihane
  • E. Franciosini
  • J. R. Lewis
  • L. Magrini
  • L. Morbidelli
  • G. G. Sacco
  • C. C. Worley
  • S. Feltzing
  • R. D. Jeffries
  • A. Vallenari
  • T. Bensby
  • A. Bragaglia
  • E. Flaccomio
  • P. Francois
  • A. J. Korn
  • A. Lanzafame
  • E. Pancino
  • A. Recio-Blanco
  • R. Smiljanic
  • G. Carraro
  • M. T. Costado
  • F. Damiani
  • P. Donati
  • A. Frasca
  • P. Jofré
  • C. Lardo
  • P. de Laverny
  • L. Monaco
  • L. Prisinzano
  • L. Sbordone
  • S. G. Sousa
  • G. Tautvaišiene
  • S. Zaggia
  • T. Zwitter
  • E. Delgado Mena
  • Y. Chorniy
  • S. L. Martell
  • V. Silva Aguirre
  • A. Miglio
  • C. Chiappini
  • J. Montalban
  • T. Morel
  • M. Valentini

Summary, in English

The discovery of lithium-rich giants contradicts expectations from canonical stellar evolution. Here we report on the serendipitous discovery of 20 Li-rich giants observed during the Gaia-ESO Survey, which includes the first nine Li-rich giant stars known towards the CoRoT fields. Most of our Li-rich giants have near-solar metallicities and stellar parameters consistent with being before the luminosity bump. This is difficult to reconcile with deep mixing models proposed to explain lithium enrichment, because these models can only operate at later evolutionary stages: at or past the luminosity bump. In an effort to shed light on the Li-rich phenomenon, we highlight recent evidence of the tidal destruction of close-in hot Jupiters at the sub-giant phase.We note that when coupled with models of planet accretion, the observed destruction of hot Jupiters actually predicts the existence of Li-rich giant stars, and suggests that Li-rich stars should be found early on the giant branch and occur more frequently with increasing metallicity. A comprehensive review of all known Li-rich giant stars reveals that this scenario is consistent with the data. However, more evolved or metal-poor stars are less likely to host close-in giant planets, implying that their Li-rich origin requires an alternative explanation, likely related to mixing scenarios rather than external phenomena.

Avdelning/ar

  • Astronomi - Har omorganiserats

Publiceringsår

2016-09-21

Språk

Engelska

Sidor

3336-3352

Publikation/Tidskrift/Serie

Monthly Notices of the Royal Astronomical Society

Volym

461

Issue

3

Dokumenttyp

Artikel i tidskrift

Förlag

Oxford University Press

Ämne

  • Astronomy, Astrophysics and Cosmology

Nyckelord

  • Abundances
  • Stars

Aktiv

Published

Projekt

  • Gaia-ESO Survey

ISBN/ISSN/Övrigt

  • ISSN: 0035-8711