J/ApJ/724/154 Lithium abundances in stars with planets (Ghezzi+, 2010)
Lithium abundances in a sample of planet-hosting dwarfs.
Ghezzi L., Cunha K., Smith V.V., de la Reza R.
<Astrophys. J., 724, 154-164 (2010)>
=2010ApJ...724..154G 2010ApJ...724..154G
ADC_Keywords: Abundances ; Spectroscopy ; Line Profiles ;
Stars, double and multiple ; Planets ; Stars, dwarfs
Keywords: line: profiles - planetary systems - stars: abundances -
planets and satellites: formation - stars: atmospheres
Abstract:
This work presents a homogeneous determination of lithium abundances
in a large sample of giant-planet-hosting stars (N=117) and a control
sample of disk stars without detected planets (N=145). The lithium
abundances were derived using a detailed profile fitting of the LiI
doublet at 6708Å in LTE. The planet-hosting and comparison stars
were chosen to have significant overlap in their respective physical
properties, including effective temperatures, luminosities, masses,
metallicities, and ages. The combination of uniform data and
homogeneous analysis with well-selected samples makes this study well
suited to probe for possible differences in the lithium abundances
found in planet-hosting stars. An overall comparison between the two
samples reveals no obvious differences between stars with and without
planets. A closer examination of the behavior of the Li abundances
over a narrow range of effective temperature (5700K≤Teff≤5850K)
indicates subtle differences between the two stellar samples; this
temperature range is particularly sensitive to various physical
processes that can deplete lithium.
Description:
The target stars were previously analyzed in Paper I (Ghezzi et al.,
2010, Cat. J/ApJ/720/1290) where stellar parameters and iron
abundances were derived. In addition, a control sample of
main-sequence stars without detected planets so far was compiled from
the subset of 850 nearby FGK stars in Fischer & Valenti (2005, Cat.
J/ApJ/622/1102), which has been monitored in planet search programmes.
High-resolution (R∼48000) and high signal-to-noise (S/N∼200) spectra
were obtained with the Fiber-fed Extended Range Optical Spectrograph
(FEROS) attached to the MPG/ESO-2.20m telescope (La Silla, Chile)
during six observing runs between 2007 April and 2008 August.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 34 262 Lithium abundances (LiI line at 6707.8Å)
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See also:
J/ApJ/720/1290 : Abundances of stars hosting planets (Ghezzi+, 2010)
J/MNRAS/403/1368 : Li abundances for star-planet systems (Gonzalez+, 2010)
J/A+A/515/A93 : Li abundances in solar-analog stars. II. (Takeda+, 2010)
J/A+A/496/527 : RV curves of HD 47186 and HD 181433 (Bouchy+, 2009)
J/A+A/503/541 : Neutral Li in late-type stars non-LTE calculations (Lind+,
2009)
J/A+A/487/373 : Spectroscopy of 451 HARPS-GTO stars (Sousa+, 2008)
J/ApJ/622/1102 : The planet-metallicity correlation. (Fischer+, 2005)
J/PASJ/57/45 : Lithium abundances of F-K stars (Takeda+, 2005)
J/ApJS/152/261 : Chromospheric Ca II emission in nearby stars (Wright+, 2004)
J/MNRAS/349/757 : Masses and metallicities of F-G dwarfs (Lambert+, 2004)
J/A+A/371/943 : Lithium abundances for 185 main-sequence stars (Chen+, 2001)
J/A+A/375/205 : The CORALIE survey for extrasolar planets V (Naef+ 2001)
J/AJ/111/439 : Chromospheric emission in late-type stars. (Henry+ 1996)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star Name
12- 16 F5.3 0.1nm FWHM Gaussian Full-Width at Half-Maximum of line (1)
18 A1 --- l_A(Li) Upper limit flag on A(Li)
20- 24 F5.2 [-] A(Li) Lithium Abundance (A(Li)=log[N(Li)/N(H)]+12)
26- 29 F4.2 [-] e_A(Li) ? Formal Uncertainty on A(Li) from profile
fitting
31- 34 F4.2 [-] dA(Li) ? Total Uncertainty on A(Li)
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Note (1): Which includes the contributions of instrumental profile,
macroturbulence, and rotation.
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History:
From electronic version of the journal
References:
Ghezzi et al. Paper I. 2010ApJ...720.1290G 2010ApJ...720.1290G Cat. J/ApJ/720/1290
Ghezzi et al. Paper II. 2010ApJ...725..721G 2010ApJ...725..721G
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 27-Jul-2012