Stellar atmospheric parameters of CARMENES GTO M dwarfs with spectral synthesis and SteParSyn
Creators
- Marfil, Emilio1
- Tabernero, Hugo M.2
- Montes, David1
- Caballero, Jose Antonio2
- Lazaro-Barrasa, Francisco Javier1
- González Hernández, Jonay I.3
- Nagel, Evangelos4
- Passegger, Vera M.4
- Schweitzer, Andreas4
- Ribas, Ignasi5
- Reiners, Ansgar6
- Quirrenbach, Andreas7
- Amado, Pedro J.8
- Cifuentes, Carlos2
- Cortés-Contreras, Miriam2
- Dreizler, Stefan6
- Duque-Arribas, Christian1
- Galadí-Enríquez, David9
- Henning, Thomas10
- Jeffers, Sandra V.6
- Kaminski, Adrian7
- Kürster, Martin10
- Lafarga, Marina5
- López-Gallifa, Álvaro1
- Morales, Juan Carlos5
- Shan, Yutong6
- Zechmeister, Matthias6
- 1. Universidad Complutense de Madrid
- 2. Centro de Astrobiología
- 3. Instituto de Astrofísica de Canarias
- 4. Hamburger Sternwarte
- 5. Institut de Ciències de l'Espai
- 6. Institut für Astrophysik Göttingen
- 7. Landessternwarte Königstuhl
- 8. Instituto de Astrofísica de Andalucía
- 9. Calar Alto observatory
- 10. Max-Planck-Institut für Astronomie
Contributors
Editor:
Description
We aim to review the spectral synthesis technique to derive the stellar atmospheric parameters (Teff, log g, and [Fe/H]) of 348 M dwarfs in light of the optical and near-infrared spectra obtained with CARMENES, the high-resolution, double-channel spectrograph installed at the 3.5 m telescope at the Calar Alto observatory (Spain). The analysis relies on the SteParSyn code as the preferred MCMC implementation of the spectral synthesis technique, along with 75 carefully selected, magnetically insensitive, Fe I and Ti I lines plus the γ- and ϵ-TiO bands synthesised with a grid of BT-Settl model atmospheres and the turbospectrum code. To avoid potential degeneracies in the parameter space, we impose a Bayesian prior on Teff and log g based on comprehensive, multi-band photometric data available for the sample. As a benchmark test in Teff, log g, and [Fe/H] we place special emphasis on three special subsets in our sample, namely 14 M dwarfs with interferometric angular diameter measurements, 15 M+M systems, and 7 wide physical binaries harbouring an FGK-type primary with known metallicity.
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Additional details
References
- Allard et al. 2012, Phil. Tr. R. Soc. London Ser. A, 370, 2765
- Cifuentes et al. 2020, A&A, 642, A115
- Mann et al. 2015, ApJ, 804, 1, A64
- Montes et al. 2018, MNRAS, 479, 1332
- Passegger et al. 2019, A&A, 627, A161
- Plez 2012, Turbospectrum, Astrophysics Source Code Library
- Tabernero et al. 2018. MNRAS, 476, 3106
- Tabernero et al. 2021, A&A, 646, A98