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

被引：43

作者：

Souto, D. ^{[1
]}

Cunha, K. ^{[1
,2
]}

Garcia-Hernandez, D. A. ^{[3
,4
]}

Zamora, O. ^{[3
,4
]}

Allende Prieto, C. ^{[3
,4
]}

Smith, V. V. ^{[5
]}

Mahadevan, S. ^{[6
,7
]}

Blake, C. ^{[8
]}

Johnson, J. A. ^{[9
]}

Jonsson, H. ^{[3
,4
]}

Pinsonneault, M. ^{[9
]}

Holtzman, J. ^{[10
]}

Majewski, S. R. ^{[11
]}

Shetrone, M. ^{[12
]}

Teske, J. ^{[13
]}

Nidever, D. ^{[14
,15
,16
]}

Schiavon, R. ^{[17
]}

Sobeck, J. ^{[11
]}

Garcia Perez, A. E. ^{[3
,4
]}

Gomez Maqueo Chew, Y. ^{[18
]}

Stassun, K. ^{[19
]}

机构：

[1] Observ Nacl, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil

[2] Univ Arizona, Tucson, AZ 85719 USA

[3] IAC, Via Lactea S-N, E-38205 Tenerife, Spain

[4] ULL, Dept Astrofis, E-38206 Tenerife, Spain

[5] Natl Opt Astron Observ, 950 North Cherry Ave, Tucson, AZ 85719 USA

[6] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[7] Penn State Univ, Ctr Exoplanets & Habitable Worlds, University Pk, PA 16802 USA

[8] Univ Penn, Dept Phys & Astron, 209 South 33rd St, Philadelphia, PA 19104 USA

[9] Ohio State Univ, Dept Astron, 174 W 18Th Ave, Columbus, OH 43210 USA

[10] New Mexico State Univ, Las Cruces, NM 88003 USA

[11] Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA

[12] Univ Texas Austin, McDonald Observ, Austin, TX 78712 USA

[13] Carnegie Inst Sci, Dept Terr Magnetism, 5241 Broad Branch Rd NW, Washington, DC 20015 USA

[14] Univ Michigan, Dept Astron, Ann Arbor, MI 48104 USA

[15] Large Synopt Survey Telescope, 950 North Cherry Ave, Tucson, AZ 85719 USA

[16] Steward Observ, 933 North Cherry Ave, Tucson, AZ 85719 USA

[17] Liverpool John Moores Univ, Astrophys Res Inst, 146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England

[18] Univ Nacl Autonoma Mexico, Inst Astron, Ciudad Univ, Ciudad De Mexico 04510, DF, Mexico

[19] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

来源：

ASTROPHYSICAL JOURNAL | 2017年 / 835卷 / 02期

基金：

美国安德鲁·梅隆基金会;

关键词：

infrared: stars; planetary systems; planet; star interactions; stars: abundances; stars: fundamental parameters; stars: low-mass; NEAR-INFRARED SPECTROSCOPY; LOW-MASS STARS; RESOLUTION OPTICAL-SPECTRA; STELLAR PARAMETERS; OXYGEN ABUNDANCES; RED GIANTS; METALLICITIES; PLANETS; CALIBRATION; LUMINOSITY;

D O I：

10.3847/1538-4357/835/2/239

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 similar to 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 similar to 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.

引用

页数：12

共 3 条

[1] The California-Kepler Survey. I. High-resolution Spectroscopy of 1305 Stars Hosting Kepler Transiting Planets
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ASTRONOMICAL JOURNAL, 2017, 154 (03):
[2] Stellar Characterization and Chemical Abundances of Exoplanet-hosting M Dwarfs from APOGEE Spectra: Future JWST Targets
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[3] Chemical Abundances of Main-sequence, Turnoff, Subgiant, and Red Giant Stars from APOGEE Spectra. I. Signatures of Diffusion in the Open Cluster M67
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Pinsonneault, Marc
Holzer, Parker
Frinchaboy, Peter
Holtzman, Jon
Johnson, J. A.
Jonsson, Henrik
Majewski, Steven R.
Shetrone, Matthew
Sobeck, Jennifer
Stringfellow, Guy
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ASTROPHYSICAL JOURNAL, 2018, 857 (01):

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