Chemical Abundances of M-Dwarfs from the Apogee Survey. I. the Exoplanet Hosting Stars Kepler-138 and Kepler-186
(2017) In Astrophysical Journal 835(2).- 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 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... (More)
(Less)
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 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 ± 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
- organization
- publishing date
- 2017-02-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- infrared: stars, planet-star interactions, planetary systems, stars: abundances, stars: fundamental parameters, stars: low-mass
- in
- Astrophysical Journal
- volume
- 835
- issue
- 2
- article number
- 239
- publisher
- American Astronomical Society
- external identifiers
-
- scopus:85011965991
- ISSN
- 0004-637X
- DOI
- 10.3847/1538-4357/835/2/239
- language
- English
- LU publication?
- yes
- id
- 2a8720e8-720f-454e-b3ea-63622364887a
- date added to LUP
- 2019-05-06 11:49:13
- date last changed
- 2024-04-16 04:25:56
@article{2a8720e8-720f-454e-b3ea-63622364887a, abstract = {{<p><br> 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 H<br> <sub>2</sub><br> 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]<br> <sub>Kepler-138</sub><br> = -0.09 ± 0.09 dex and [Fe/H]<br> <sub>Kepler-186</sub><br> = -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.<br> </p>}}, author = {{Souto, D. and Cunha, K. and García-Hernández, D. A. and Zamora, O. and Prieto, C. Allende and Smith, V. V. and Mahadevan, S. and Blake, C. and Johnson, J. A. and Jönsson, H. and Pinsonneault, M. and Holtzman, J. and Majewski, S. R. and Shetrone, M. and Teske, J. and Nidever, D. and Schiavon, R. and Sobeck, J. and Pérez, A. E.García and Chew, Y. Gómez Maqueo and Stassun, K.}}, issn = {{0004-637X}}, keywords = {{infrared: stars; planet-star interactions; planetary systems; stars: abundances; stars: fundamental parameters; stars: low-mass}}, language = {{eng}}, month = {{02}}, number = {{2}}, publisher = {{American Astronomical Society}}, series = {{Astrophysical Journal}}, title = {{Chemical Abundances of M-Dwarfs from the Apogee Survey. I. the Exoplanet Hosting Stars Kepler-138 and Kepler-186}}, url = {{http://dx.doi.org/10.3847/1538-4357/835/2/239}}, doi = {{10.3847/1538-4357/835/2/239}}, volume = {{835}}, year = {{2017}}, }