Chemical Abundances of M-Dwarfs from the Apogee Survey. I. the Exoplanet Hosting Stars Kepler-138 and Kepler-186

D. Souto; K. Cunha; D. A. García-Hernández; O. Zamora; C. Allende Prieto; V. V. Smith; S. Mahadevan; C. Blake; J. A. Johnson; H. Jönsson; M. Pinsonneault; J. Holtzman; S. R. Majewski; M. Shetrone; J. Teske; D. Nidever; R. Schiavon; J. Sobeck; A. E.García Pérez; Y. Gómez Maqueo Chew; K. Stassun

doi:10.3847/1538-4357/835/2/239

Chemical Abundances of M-Dwarfs from the Apogee Survey. I. the Exoplanet Hosting Stars Kepler-138 and Kepler-186

D. Souto, K. Cunha, D. A. García-Hernández, O. Zamora, C. Allende Prieto, V. V. Smith, S. Mahadevan, C. Blake, J. A. Johnson, H. Jönsson, M. Pinsonneault, J. Holtzman, S. R. Majewski, M. Shetrone, J. Teske, D. Nidever, R. Schiavon, J. Sobeck, A. E.García Pérez, Y. Gómez Maqueo ChewK. Stassun

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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 ∼ 22,500) H-band spectra from the SDSS-IV-APOGEE survey. Chemical abundances of 13 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 H₂O 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 ± 0.09 dex and [Fe/H]_Kepler-186 = -0.08 ± 0.10 dex. The measured metallicities resulting from this high-resolution analysis are found to be higher by ∼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 ± 0.10 for Kepler-138 and 0.52 ± 0.12 for Kepler-186. Kepler-186 exhibits a marginally enhanced [Si/Fe] ratio.

Original language	English (US)
Article number	239
Journal	Astrophysical Journal
Volume	835
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/835/2/239
State	Published - Feb 1 2017

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-4357/835/2/239

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Souto, D., Cunha, K., García-Hernández, D. A., Zamora, O., Prieto, C. A., Smith, V. V., Mahadevan, S., Blake, C., Johnson, J. A., Jönsson, H., Pinsonneault, M., Holtzman, J., Majewski, S. R., Shetrone, M., Teske, J., Nidever, D., Schiavon, R., Sobeck, J., Pérez, A. E. G., ... Stassun, K. (2017). Chemical Abundances of M-Dwarfs from the Apogee Survey. I. the Exoplanet Hosting Stars Kepler-138 and Kepler-186. Astrophysical Journal, 835(2), Article 239. https://doi.org/10.3847/1538-4357/835/2/239

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title = "Chemical Abundances of M-Dwarfs from the Apogee Survey. I. the Exoplanet Hosting Stars Kepler-138 and Kepler-186",

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 ∼ 22,500) H-band spectra from the SDSS-IV-APOGEE survey. Chemical abundances of 13 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 H2O 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 ± 0.09 dex and [Fe/H]Kepler-186 = -0.08 ± 0.10 dex. The measured metallicities resulting from this high-resolution analysis are found to be higher by ∼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 ± 0.10 for Kepler-138 and 0.52 ± 0.12 for Kepler-186. Kepler-186 exhibits a marginally enhanced [Si/Fe] ratio.",

author = "D. Souto and K. Cunha and Garc{\'i}a-Hern{\'a}ndez, {D. A.} and O. Zamora and Prieto, {C. Allende} and Smith, {V. V.} and S. Mahadevan and C. Blake and Johnson, {J. A.} and H. J{\"o}nsson and M. Pinsonneault and J. Holtzman and Majewski, {S. R.} and M. Shetrone and J. Teske and D. Nidever and R. Schiavon and J. Sobeck and P{\'e}rez, {A. E.Garc{\'i}a} and Chew, {Y. G{\'o}mez Maqueo} and K. Stassun",

year = "2017",

month = feb,

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doi = "10.3847/1538-4357/835/2/239",

language = "English (US)",

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Souto, D, Cunha, K, García-Hernández, DA, Zamora, O, Prieto, CA, Smith, VV, Mahadevan, S, Blake, C, Johnson, JA, Jönsson, H, Pinsonneault, M, Holtzman, J, Majewski, SR, Shetrone, M, Teske, J, Nidever, D, Schiavon, R, Sobeck, J, Pérez, AEG, Chew, YGM & Stassun, K 2017, 'Chemical Abundances of M-Dwarfs from the Apogee Survey. I. the Exoplanet Hosting Stars Kepler-138 and Kepler-186', Astrophysical Journal, vol. 835, no. 2, 239. https://doi.org/10.3847/1538-4357/835/2/239

TY - JOUR

T1 - Chemical Abundances of M-Dwarfs from the Apogee Survey. I. the Exoplanet Hosting Stars Kepler-138 and Kepler-186

AU - Souto, D.

AU - Cunha, K.

AU - García-Hernández, D. A.

AU - Zamora, O.

AU - Prieto, C. Allende

AU - Smith, V. V.

AU - Mahadevan, S.

AU - Blake, C.

AU - Johnson, J. A.

AU - Jönsson, H.

AU - Pinsonneault, M.

AU - Holtzman, J.

AU - Majewski, S. R.

AU - Shetrone, M.

AU - Teske, J.

AU - Nidever, D.

AU - Schiavon, R.

AU - Sobeck, J.

AU - Pérez, A. E.García

AU - Chew, Y. Gómez Maqueo

AU - Stassun, K.

PY - 2017/2/1

Y1 - 2017/2/1

N2 - 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 ∼ 22,500) H-band spectra from the SDSS-IV-APOGEE survey. Chemical abundances of 13 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 H2O 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 ± 0.09 dex and [Fe/H]Kepler-186 = -0.08 ± 0.10 dex. The measured metallicities resulting from this high-resolution analysis are found to be higher by ∼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 ± 0.10 for Kepler-138 and 0.52 ± 0.12 for Kepler-186. Kepler-186 exhibits a marginally enhanced [Si/Fe] ratio.

AB - 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 ∼ 22,500) H-band spectra from the SDSS-IV-APOGEE survey. Chemical abundances of 13 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 H2O 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 ± 0.09 dex and [Fe/H]Kepler-186 = -0.08 ± 0.10 dex. The measured metallicities resulting from this high-resolution analysis are found to be higher by ∼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 ± 0.10 for Kepler-138 and 0.52 ± 0.12 for Kepler-186. Kepler-186 exhibits a marginally enhanced [Si/Fe] ratio.

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UR - http://www.scopus.com/inward/citedby.url?scp=85011965991&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/835/2/239

DO - 10.3847/1538-4357/835/2/239

M3 - Article

AN - SCOPUS:85011965991

SN - 0004-637X

VL - 835

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 239

ER -

Chemical Abundances of M-Dwarfs from the Apogee Survey. I. the Exoplanet Hosting Stars Kepler-138 and Kepler-186

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