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Chemical Abundances of M-dwarfs from the APOGEE Survey. I. The Exoplanet Hosting Stars Kepler-138 and Kepler-186 | Diogo Souto
; Katia Cunha
; D. A. Garcia-Hernandez
; Olga Zamora
; C. Allende Prieto
; Verne Smith
; Suvrath Mahadevan Cullen Blake
; J. A. Johnson
; Henrik Jonsson
; Marc Pinsonneault
; Jon Holtzman
; S. R. Majewski
; Matthew Shetrone
; Johanna Teske
; David Nidever
; Ricardo Schiavon
; Jennifer Sobeck
; A. E. Garcia Perez
; Y. Gomez Maqueo Chew
; Keivan Stassun
; | Date: |
6 Dec 2016 | Abstract: | We report the first detailed chemical abundance analysis of the
exoplanet-hosting M-dwarf stars Kepler-138 and Kepler-186 from the analysis of
high-resolution ($R$ $sim$ 22,500) $H$-band spectra from the SDSS IV - APOGEE
survey. Chemical abundances of thirteen elements - C, O, Na, Mg, Al, Si, K, Ca,
Ti, V, Cr, Mn, and Fe - are extracted from the APOGEE spectra of these early
M-dwarfs via spectrum syntheses computed with an improved line list that takes
into account H$_{2}$O and FeH lines. This paper demonstrates that APOGEE
spectra can be analyzed to determine detailed chemical compositions of
M-dwarfs. Both exoplanet-hosting M-dwarfs display modest sub-solar
metallicities: [Fe/H]$_{Kepler-138}$ = -0.09 $pm$ 0.09 dex and
[Fe/H]$_{Kepler-186}$ = -0.08 $pm$ 0.10 dex. The measured metallicities
resulting from this high-resolution analysis are found to be higher by
$sim$0.1-0.2 dex than previous estimates from lower-resolution spectra. The
C/O ratios obtained for the two planet-hosting stars are near-solar, with
values of 0.55 $pm$ 0.10 for Kepler-138 and 0.52 $pm$ 0.12 for Kepler-186.
Kepler-186 exhibits a marginally enhanced [Si/Fe] ratio. | Source: | arXiv, 1612.1598 | Services: | Forum | Review | PDF | Favorites |
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