J/ApJ/720/1290 Abundances of stars hosting planets (Ghezzi+, 2010)
Stellar parameters and metallicities of stars hosting Jovian and Neptunian mass
planets: a possible dependence of planetary mass on metallicity.
Ghezzi L., Cunha K., Smith V.V., de Araujo F.X., Schuler S.C.,
de la Reza R.
<Astrophys. J., 720, 1290-1302 (2010)>
=2010ApJ...720.1290G 2010ApJ...720.1290G
ADC_Keywords: Abundances ; Stars, double and multiple ; Planets ;
Stars, masses ; Stars, ages
Keywords: planetary systems - planets and satellites: formation -
stars: abundances - stars: atmospheres - stars: fundamental parameters
Abstract:
The metal content of planet-hosting stars is an important ingredient
that may affect the formation and evolution of planetary systems.
Accurate stellar abundances require the determinations of reliable
physical parameters, namely, the effective temperature, surface
gravity, microturbulent velocity, and metallicity. This work presents
the homogeneous derivation of such parameters for a large sample of
stars hosting planets (N=117), as well as a control sample of disk
stars not known to harbor giant, closely orbiting planets (N=145).
Stellar parameters and iron abundances are derived from an automated
analysis technique developed for this work. As previously found in the
literature, the results in this study indicate that the metallicity
distribution of planet-hosting stars is more metal rich by ∼0.15 dex
when compared to the control sample stars. A segregation of the sample
according to planet mass indicates that the metallicity distribution
of stars hosting only Neptunian-mass planets (with no Jovian-mass
planets) tends to be more metal poor in comparison with that obtained
for stars hosting a closely orbiting Jovian planet. The significance
of this difference in metallicity arises from a homogeneous analysis
of samples of FGK dwarfs which do not include the cooler and more
problematic M dwarfs.
Description:
High-resolution spectra were obtained with the Fiber-fed Extended
Range Optical Spectrograph (FEROS) attached to the MPG/ESO-2.20m
telescope (La Silla, Chile). This instrumental setup produces spectra
with almost complete spectral coverage from 3560 to 9200Å (over 39
echelle orders) and at a nominal resolution
R=λ/Δλ∼48000. The observations were conducted
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 47 265 Log of observations
table3.dat 106 262 Atmospheric parameters
table4.dat 143 265 Evolutionary parameters
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See also:
J/A+A/536/A71 : Atmospheric parameters of nearby giant stars (Jones+, 2011)
J/ApJ/715/1050 : Predicted abundances for extrasolar planets. I. (Bond+, 2010)
J/A+A/497/563 : Chemical abundances of 451 stars (Neves+, 2009)
J/MNRAS/370/163 : Abundance distribution of stars with planets (Bond+, 2006)
J/A+A/449/723 : Abundances in atmospheres of stars with planets (Gilli+,
2006)
J/A+A/458/873 : Stellar parameters of metal-rich solar-type stars (Sousa+,
2006)
J/A+A/438/251 : Abundances in stars with giant planets (Beirao+, 2005)
J/ApJ/622/1102 : The planet-metallicity correlation. (Fischer+, 2005)
J/A+A/415/1153 : [Fe/H] for 98 extra-solar planet-host stars (Santos+, 2004)
http://exoplanet.eu/ : Extrasolar Planet Encyclopaedia home page
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 Object name (1)
15- 19 F5.2 mag Vmag Apparent magnitude in V band from Hipparcos
and Tycho (Cat. I/239)
23- 33 A11 "YYYY/MMM/DD" Date Date of observation
37- 41 I5 s Texp Total exposure time
45- 47 I3 --- S/N Signal-to-Noise ratio per resolution element
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Note (1): HD 73753 is very likely a misprint for HD 73573; corrected at CDS.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Object Name
15- 18 I4 K Teff Effective Temperature
23- 25 I3 K e_Teff Uncertainty in Teff
29- 32 F4.2 [cm/s2] log(g) Surface Gravity
37- 40 F4.2 [cm/s2] e_log(g) Uncertainty in log(g)
45- 48 F4.2 km/s Vt Microturbulence ξ
53- 56 F4.2 km/s e_Vt Uncertainty in Vt
61- 64 F4.2 [---] A(Fe) Iron Abundance (log[N(Fe)/N(H)]+12)
69- 72 F4.2 [---] e_A(FeI) Standard Deviation of FeI Abundance
76- 77 I2 --- N(FeI) Number of FeI Lines Used
81- 84 F4.2 [---] e_A(FeII) Standard Deviation of FeII Abundance
88- 89 I2 [---] N(FeII) Number of FeII Lines Used
94- 98 F5.2 [Sun] [Fe/H] Metallicity
103-106 F4.2 [Sun] e_[Fe/H] Uncertainty in [Fe/H]
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Object Name
15- 20 F6.2 mas plx Parallax (from van Leeuwen et al.,
2007ASSL..350.....V 2007ASSL..350.....V; see Cat. I/311)
26- 29 F4.2 mas e_plx Uncertainty in plx
34- 39 F6.3 [Lsun] log(L) Log of the luminosity
45- 49 F5.3 [Lsun] e_log(L) Uncertainty in log(L)
55- 58 F4.2 Rsun Rad Stellar radius
64- 67 F4.2 Rsun e_Rad Uncertainty in Rad
73- 76 F4.2 Msun Msp Stellar Spectroscopic mass
82- 85 F4.2 Msun e_Msp Uncertainty in Msp
91- 94 F4.2 Msun Mtr Stellar evolutionary track mass
100-103 F4.2 Msun e_Mtr Uncertainty in Mtr
109-112 F4.2 [cm/s2] log(gH) Hipparcos surface gravity
118-121 F4.2 [cm/s2] e_log(gH) Uncertainty in log(gHip)
125 A1 --- l_Age Upper or lower limit flag on Age
126-129 F4.1 Gyr Age Isochrone age
134-137 F4.1 Gyr b_Age ? Lower Limit to Age
140-143 F4.1 Gyr B_Age ? Upper Limit to Age
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History:
From electronic version of the journal
References:
Ghezzi et al. Lithium abundances. 2010ApJ...724..154G 2010ApJ...724..154G Cat. J/ApJ/724/154
Ghezzi et al. Giants and subgiants. 2010ApJ...725..721G 2010ApJ...725..721G
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 29-Jun-2012