J/AJ/164/181 Iron & carbon abundances in ∼50000 Kepler field stars (Unni+, 2022)
Carbon Abundance of Stars in the LAMOST-Kepler Field.
Unni A., Narang M., Sivarani T., Puravankara M., Banyal R.K., Surya A.,
Rajaguru S.P., Swastik C.
<Astron. J., 164, 181 (2022)>
=2022AJ....164..181U 2022AJ....164..181U
ADC_Keywords: Abundances, [Fe/H]; Exoplanets; Spectra, optical;
Effective temperatures
Keywords: Stellar abundances ; Exoplanet formation ; Spectroscopy ;
Surveys ; Planet hosting stars ; Exoplanet catalogs
Abstract:
The correlation between host star iron abundance and the exoplanet
occurrence rate is well established and arrived at in several studies.
Similar correlations may be present for the most abundant elements,
such as carbon and oxygen, which also control the dust chemistry of
the protoplanetary disk. In this paper, using a large number of stars
in the Kepler field observed by the LAMOST survey, it has been
possible to estimate the planet occurrence rate with respect to the
host star carbon abundance. Carbon abundances are derived using
synthetic spectra fit of the CH- G-band region in the LAMOST spectra.
The carbon abundance trend with metallicity is consistent with the
previous studies and follows the Galactic chemical evolution (GCE).
Similar to [Fe/H], we find that the [C/H] values are higher among
giant-planet hosts. The trend between [C/Fe] and [Fe/H] in planet
hosts and single stars is similar; however, there is a preference for
giant planets around host stars with a subsolar [C/Fe] ratio and
higher [Fe/H]. Higher metallicity and subsolar [C/Fe] values are found
among younger stars as a result of GCE. Hence, based on the current
sample, it is difficult to interpret the results as a consequence of
GCE or due to planet formation.
Description:
Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) is
a wide field spectroscopic survey facility using a telescope with a 4m
clear aperture and 5deg field of view. The survey obtains 4000 spectra
in a single exposure to a limiting magnitude of r=19 at the resolution
R=1800 and simultaneous wavelength coverage of 370-900nm. We have used
the LAMOST-Kepler project Zong+, 2018ApJS..238...30Z 2018ApJS..238...30Z Public Data
Release 4 (DR4) 4 data for the current study. The observations were
carried out between 2012 and 2017 and covered the entire Kepler field.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 48 50254 Stellar parameters and the derived carbon abundance
of the sample stars
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See also:
J/A+A/415/1153 : [Fe/H] for 98 extra-solar planet-host stars (Santos+, 2004)
J/ApJ/622/1102 : The planet-metallicity correlation. (Fischer+, 2005)
J/A+A/487/373 : Spectroscopic parameters of 451 HARPS-GTO stars (Sousa+, 2008)
J/A+A/497/563 : Chemical abundances of 451 stars (Neves+, 2009)
J/A+A/508/L17 : Abundances in solar analogs (Ramirez+, 2009)
J/ApJ/715/1050 : Predicted abundances for extrasolar planets. I. (Bond+, 2010)
J/ApJ/725/2349 : C/O vs Mg/Si of planetary systems (Delgado Mena+, 2010)
J/A+A/547/A36 : Chemical abundances of 87 KOIs (Adibekyan++, 2012)
J/A+A/545/A32 : Chemical abundances of 1111 FGK stars (Adibekyan+, 2012)
J/A+A/552/A6 : Abund. of F-G main-sequence stars (Gonzalez Hernandez+, 2013)
J/A+A/562/A92 : Li abundance in solar analogues (Delgado Mena+, 2014)
J/ApJ/809/8 : Terrestrial planet occurrence rates KOI stars (Burke+, 2015)
J/A+A/576/A69 : Li abundances in F stars (Delgado Mena+, 2015)
J/MNRAS/446/1020 : Parent stars of extrasolar planets. XIV. (Gonzalez+, 2015)
J/A+A/594/A43 : APOGEE/Kepler sample stars abundances (Hawkins+, 2016)
J/AJ/152/187 : Planet occurrence & stellar metallicity KOIs (Mulders+, 2016)
J/ApJS/229/30 : Revised stellar properties Q1-17 Kepler target (Mathur+, 2017)
J/A+A/599/A96 : [C/H] Chemical abundances of 1110 stars (Suarez-Andres+, 2017)
J/ApJ/866/99 : Revised radii of KIC stars & planets Gaia DR2 (Berger+, 2018)
J/ApJS/237/38 : Extended abundance analysis of KOIs (Brewer+, 2018)
J/AJ/155/89 : California-Kepler Survey (CKS). IV. Planets (Petigura+, 2018)
J/AJ/158/190 : Main sequence hot Jupiter hosts with astrometry (Hamer+, 2019)
J/AJ/159/166 : Membership & properties of moving groups Gaia (Ujjwal+, 2020)
J/AJ/164/60 : Chemical abundances 849 exoplanet hosts stars (Swastik+, 2022)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 F11.7 deg RAdeg [12/304] Right Ascension (J2000)
13- 22 F10.7 deg DEdeg [-10/53] Declination (J2000)
24- 27 I4 K Teff [4800/6500] Effective temperature
29- 32 F4.2 [cm/s2] logg [3.91/4.91] log, surface gravity
34- 40 F7.4 [-] FeH [-0.79/0.53] Metallicity, [Fe/H]
42- 48 F7.4 [-] CH [-1.25/1.08] Carbon-to-Hydrogen number ratio, [C/H]
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 25-Nov-2022