Article (Scientific journals)
The Gaia-ESO Survey: revisiting the Li-rich giant problem
Casey, A. R.; Ruchti, G.; Masseron, T. et al.
2016In Monthly Notices of the Royal Astronomical Society, 461, p. 3336-3352
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Keywords :
stars: abundances
Abstract :
[en] 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Casey, A. R.;  Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
Ruchti, G.;  Lund Observatory, Department of Astronomy and Theoretical Physics, Box 43, SE-221 00 Lund, Sweden
Masseron, T.;  Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
Randich, S.;  INAF - Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Florence, Italy
Gilmore, G.;  Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
Lind, K.;  Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany ; Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
Kennedy, G. M.;  Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
Koposov, S. E.;  Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
Hourihane, A.;  Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
Franciosini, E.;  INAF - Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Florence, Italy
Lewis, J. R.;  Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
Magrini, L.;  INAF - Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Florence, Italy
Morbidelli, L.;  INAF - Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Florence, Italy
Sacco, G. G.;  INAF - Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Florence, Italy
Worley, C. C.;  Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
Feltzing, S.;  Lund Observatory, Department of Astronomy and Theoretical Physics, Box 43, SE-221 00 Lund, Sweden
Jeffries, R. D.;  Astrophysics Group, Keele University, Keele, Staffordshire ST5 5BG, UK
Vallenari, A.;  INAF - Padova Observatory, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
Bensby, T.;  Lund Observatory, Department of Astronomy and Theoretical Physics, Box 43, SE-221 00 Lund, Sweden
Bragaglia, A.;  INAF - Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127 Bologna, Italy
Flaccomio, E.;  INAF - Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, I-90134 Palermo, Italy
Korn, A. J.;  Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
Lanzafame, A.;  Dipartimento di Fisica e Astronomia, Sezione Astrofisica, Universitá di Catania, via S. Sofia 78, I-95123 Catania, Italy
Pancino, E.;  INAF - Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Florence, Italy ; ASI Science Data Center, Via del Politecnico SNC, I-00133 Roma, Italy
Recio-Blanco, A.;  Laboratoire Lagrange (UMR7293), Université de Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, CS 34229, F-06304 Nice cedex 4, France
Smiljanic, R.;  Department for Astrophysics, Nicolaus Copernicus Astronomical Center, ul. Rabiańska 8, PL-87-100 Toruń, Poland
Carraro, G.;  European Southern Observatory, Alonso de Cordova 3107 Vitacura, Santiago de Chile, Chile
Costado, M. T.;  Instituto de Astrofísica de Andalucía-CSIC, Apdo. 3004, E-18080 Granada, Spain
Damiani, F.;  INAF - Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, I-90134 Palermo, Italy
Donati, P.;  INAF - Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127 Bologna, Italy ; Dipartimento di Fisica e Astronomia, Università di Bologna, viale Berti Pichat 6/2, I-40127 Bologna, Italy
Frasca, A.;  INAF - Osservatorio Astrofisico di Catania, via S. Sofia 78, I-95123 Catania, Italy
Jofré, P.;  Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
Lardo, C.;  Astrophysics Research Institute, Liverpool John Moores University, 146 Brownlow Hill, Liverpool L3 5RF, UK
de Laverny, P.;  Laboratoire Lagrange (UMR7293), Université de Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, CS 34229, F-06304 Nice cedex 4, France
Monaco, L.;  Departamento de Ciencias Fisicas, Universidad Andres Bello, Republica 220, Santiago, Chile
Prisinzano, L.;  INAF - Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, I-90134 Palermo, Italy
Sbordone, L.;  Millennium Institute of Astrophysics, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile ; Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile
Sousa, S. G.;  Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, P-4150-762 Porto, Portugal
Tautvaišienė, G.;  Institute of Theoretical Physics and Astronomy, Vilnius University, A. Gostauto 12, LT-01108 Vilnius, Lithuania
Zaggia, S.;  INAF - Padova Observatory, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
Zwitter, T.;  Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia
Delgado Mena, E.;  Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, P-4150-762 Porto, Portugal
Chorniy, Y.;  Institute of Theoretical Physics and Astronomy, Vilnius University, A. Gostauto 12, LT-01108 Vilnius, Lithuania
Martell, S. L.;  School of Physics, University of New South Wales, Sydney, NSW 2052, Australia
Silva Aguirre, V.;  Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
Miglio, A.;  School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
Chiappini, C.;  Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, Germany
Montalban, J.;  Department of Physics and Astronomy G. Galilei, University of Padova, Vicolo dell'Osservatorio 3, I-35122 Padova, Italy
Morel, Thierry  ;  Université de Liège > Groupe d'astrophysique des hautes énergies (GAPHE)
Valentini, Marica ;  Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, Germany)
More authors (41 more) Less
Language :
English
Title :
The Gaia-ESO Survey: revisiting the Li-rich giant problem
Publication date :
01 September 2016
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Blackwell Publishing, Oxford, United Kingdom
Volume :
461
Pages :
3336-3352
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 16 January 2017

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