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

被引:78
作者
Casey, A. R. [1 ]
Ruchti, G. [2 ]
Masseron, T. [1 ]
Randich, S. [3 ]
Gilmore, G. [1 ]
Lind, K. [4 ,5 ]
Kennedy, G. M. [1 ]
Koposov, S. E. [1 ]
Hourihane, A. [1 ]
Franciosini, E. [3 ]
Lewis, J. R. [1 ]
Magrini, L. [3 ]
Morbidelli, L. [3 ]
Sacco, G. G. [3 ]
Worley, C. C. [1 ]
Feltzing, S. [2 ]
Jeffries, R. D. [6 ]
Vallenari, A. [7 ]
Bensby, T. [2 ]
Bragaglia, A. [8 ]
Flaccomio, E. [9 ]
Francois, P. [10 ]
Korn, A. J. [5 ]
Lanzafame, A. [11 ]
Pancino, E. [3 ,12 ]
Recio-Blanco, A. [13 ]
Smiljanic, R. [14 ]
Carraro, G. [15 ]
Costado, M. T. [16 ]
Damiani, F. [9 ]
Donati, P. [17 ]
Frasca, A. [18 ]
Jofre, P. [1 ]
Lardo, C. [19 ]
de Laverny, P. [13 ]
Monaco, L. [20 ]
Prisinzano, L. [9 ]
Sbordone, L. [21 ,22 ]
Sousa, S. G. [23 ]
Tautvaisiene, G. [24 ]
Zaggia, S. [7 ]
Zwitter, T. [25 ]
Delgado Mena, E. [23 ]
Chorniy, Y. [24 ]
Martell, S. L. [26 ]
Aguirre, V. Silva [27 ]
Miglio, A. [28 ]
Chiappini, C. [29 ]
Montalban, J. [30 ]
Morel, T. [31 ]
机构
[1] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England
[2] Lund Observ, Dept Astron & Theoret Phys, Box 43, SE-22100 Lund, Sweden
[3] Osserv Astrofis Arcetri, INAF, Largo E Fermi 5, I-50125 Florence, Italy
[4] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
[5] Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden
[6] Keele Univ, Astrophys Grp, Keele ST5 5BG, Staffs, England
[7] Padova Observ, INAF, Vicolo Osservatorio 5, I-35122 Padua, Italy
[8] Osservatorio Astron Bologna, INAF, Via Ranzani 1, I-40127 Bologna, Italy
[9] Osserv Astron Palermo, INAF, Piazza Parlamento 1, I-90134 Palermo, Italy
[10] Univ Paris Diderot, CNRS, Observ Paris, GEPI, 5 Pl Jules Janssen, F-92190 Meudon, France
[11] Univ Catania, Sez Astrofis, Dipartimento Fis & Astron, Via S Sofia 78, I-95123 Catania, Italy
[12] ASI Sci Data Ctr, Via Politecn SNC, I-00133 Rome, Italy
[13] Univ Nice Sophia Antipolis, CNRS, Observ Cote Azur, Lab Lagrange,UMR7293, CS 34229, F-06304 Nice 4, France
[14] Nicolaus Copernicus Astron Ctr, Dept Astrophys, Ul Rabianska 8, PL-87100 Torun, Poland
[15] European Southern Observ, Alonso Cordova 3107 Vitacura, Santiago, Chile
[16] CSIC, Inst Astrofis Andalucia, Apdo 3004, E-18080 Granada, Spain
[17] Univ Bologna, Dipartimento Fis & Astron, Viale Berti Pichat 6-2, I-40127 Bologna, Italy
[18] Osserv Astrofis Catania, INAF, Via S Sofia 78, I-95123 Catania, Italy
[19] Liverpool John Moores Univ, Astrophys Res Inst, 146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England
[20] Univ Andres Bello, Dept Ciencias Fis, Republ 220, Santiago, Chile
[21] Millennium Inst Astrophys, Av Vicuna Mackenna 4860, Santiago 7820436, Chile
[22] Pontificia Univ Catolica Chile, Av Vicuna Mackenna 4860, Santiago 7820436, Chile
[23] Univ Porto, CAUP, Inst Astrofis & Ciencias Espaco, Rua Estrelas, P-4150762 Porto, Portugal
[24] Vilnius Univ, Inst Theoret Phys & Astron, A Gostauto 12, LT-01108 Vilnius, Lithuania
[25] Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia
[26] Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia
[27] Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
[28] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England
[29] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany
[30] Univ Padua, Dept Phys & Astron G Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy
[31] Univ Liege, Inst Astrophys & Geophys, Quartier Agora, Bat B5c,Allee 6 Aout 19c, B-4000 Liege, Belgium
基金
澳大利亚研究理事会; 欧洲研究理事会; 英国科学技术设施理事会; 新加坡国家研究基金会;
关键词
stars:; abundances; MASS RED GIANTS; PRE-MAIN-SEQUENCE; CLUSTER NGC 362; SUN-LIKE STARS; K-GIANTS; LITHIUM ABUNDANCES; GALACTIC BULGE; STELLAR EVOLUTION; PLANET FORMATION; EVOLVED STARS;
D O I
10.1093/mnras/stw1512
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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.
引用
收藏
页码:3336 / 3352
页数:17
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