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  The CARMENES search for exoplanets around M dwarfs Photospheric parameters of target stars from high-resolution spectroscopy. II. Simultaneous multiwavelength range modeling of activity insensitive lines

Passegger, V. M., Schweitzer, A., Shulyak, D., Nagel, E., Hauschildt, P. H., Reiners, A., et al. (2019). The CARMENES search for exoplanets around M dwarfs Photospheric parameters of target stars from high-resolution spectroscopy. II. Simultaneous multiwavelength range modeling of activity insensitive lines. Astronomy and Astrophysics, 627: A161. doi:10.1051/0004-6361/201935679.

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Passegger, V. M., Author
Schweitzer, A., Author
Shulyak, Denis1, Author              
Nagel, E., Author
Hauschildt, P. H., Author
Reiners, A., Author
Amado, P. J., Author
Caballero, J. A., Author
Cortés-Contreras, M., Author
Domínguez-Fernández, A. J., Author
Quirrenbach, A., Author
Ribas, I., Author
Azzaro, M., Author
Anglada-Escudé, G., Author
Bauer, F. F., Author
Béjar, V. J. S., Author
Dreizler, S., Author
Guenther, E. W., Author
Henning, T., Author
Jeffers, S. V., Author
Kaminski, A., AuthorKürster, M., AuthorLafarga, M., AuthorMartín, E. L., AuthorMontes, D., AuthorMorales, J. C., AuthorSchmitt, J. H. M. M., AuthorZechmeister, M., Author more..
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 Abstract: We present precise photospheric parameters of 282 M dwarfs determined from fitting the most recent version of PHOENIX models to high-resolution CARMENES spectra in the visible (0.52–0.96 μm) and NIR wavelength range (0.96–1.71 μm). With its aim to search for habitable planets around M dwarfs, several planets of different masses have been detected. The characterization of the target sample is important for the ability to derive and constrain the physical properties of any planetary systems that are detected. As a continuation of previous work in this context, we derived the fundamental stellar parameters effective temperature, surface gravity, and metallicity of the CARMENES M-dwarf targets from PHOENIX model fits using a χ2 method. We calculated updated PHOENIX stellar atmosphere models that include a new equation of state to especially account for spectral features of low-temperature stellar atmospheres as well as new atomic and molecular line lists. We show the importance of selecting magnetically insensitive lines for fitting to avoid effects of stellar activity in the line profiles. For the first time, we directly compare stellar parameters derived from multiwavelength range spectra, simultaneously observed for the same star. In comparison with literature values we show that fundamental parameters derived from visible spectra and visible and NIR spectra combined are in better agreement than those derived from the same spectra in the NIR alone.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1051/0004-6361/201935679
 Degree: -

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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: Les Ulis Cedex A France : EDP Sciences
Pages: - Volume / Issue: 627 Sequence Number: A161 Start / End Page: - Identifier: Other: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1