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
Abstract
In this paper, 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 derivedmore »
- Authors:
-
more »
- Hamburger Sternwarte, Hamburg (Germany)
- Max Planck Inst. for Solar System Research, Göttingen (Germany)
- Georg-August-Univ., Göttingen (Germany). Institut für Astrophysik
- Inst. de Astrofísica de Andalucía (IAA-CSIC), Granada (Spain)
- Centro de Astrobiología (CSIC-INTA), Madrid (Spain)
- Univ. Complutense, Madrid (Spain)
- Univ. Heidelberg (Germany)
- Inst. de Ciències de l’Espai (CSIC-IEEC), Barcelona (Spain); Inst. d’Estudis Espacials de Catalunya (IEEC), Barcelona (Spain)
- Centro Astronómico Hispano-Alemán (CSIC-MPG), Almería (Spain). Observatorio Astronómico de Calar Alto
- Inst. de Astrofísica de Andalucía (IAA-CSIC), Granada (Spain); Queen Mary Univ. of London (United Kingdom)
- Inst. de Astrofísica de Canarias, Tenerife (Spain); Univ. de La Laguna, Tenerife (Spain)
- Thüringer Landessternwarte Tautenburg (Germany)
- Max Planck Inst. für Astronomie, Heidelberg (Germany)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC) Center (NERSC); Univ. of California, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
- OSTI Identifier:
- 1577586
- Grant/Contract Number:
- AC03-76SF00098
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Astronomy and Astrophysics
- Additional Journal Information:
- Journal Volume: 627; Journal ID: ISSN 0004-6361
- Publisher:
- EDP Sciences
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; astronomical databases; miscellaneous - methods; data analysis - techniques; spectroscopic - stars; late-type - stars; fundamental parameters - stars; low-mass
Citation Formats
Passegger, V. M., Schweitzer, A., Shulyak, D., Nagel, E., Hauschildt, P. H., Reiners, A., Amado, P. J., Caballero, J. A., Cortés-Contreras, M., Domínguez-Fernández, A. J., Quirrenbach, A., Ribas, I., Azzaro, M., Anglada-Escudé, G., Bauer, F. F., Béjar, V. J. S., Dreizler, S., Guenther, E. W., Henning, T., Jeffers, S. V., Kaminski, A., Kürster, M., Lafarga, M., Martín, E. L., Montes, D., Morales, J. C., Schmitt, J. H. M. M., and Zechmeister, M. 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. United States: N. p., 2019.
Web. doi:10.1051/0004-6361/201935679.
Passegger, V. M., Schweitzer, A., Shulyak, D., Nagel, E., Hauschildt, P. H., Reiners, A., Amado, P. J., Caballero, J. A., Cortés-Contreras, M., Domínguez-Fernández, A. J., Quirrenbach, A., Ribas, I., Azzaro, M., Anglada-Escudé, G., Bauer, F. F., Béjar, V. J. S., Dreizler, S., Guenther, E. W., Henning, T., Jeffers, S. V., Kaminski, A., Kürster, M., Lafarga, M., Martín, E. L., Montes, D., Morales, J. C., Schmitt, J. H. M. M., & Zechmeister, M. 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. United States. doi:https://doi.org/10.1051/0004-6361/201935679
Passegger, V. M., Schweitzer, A., Shulyak, D., Nagel, E., Hauschildt, P. H., Reiners, A., Amado, P. J., Caballero, J. A., Cortés-Contreras, M., Domínguez-Fernández, A. J., Quirrenbach, A., Ribas, I., Azzaro, M., Anglada-Escudé, G., Bauer, F. F., Béjar, V. J. S., Dreizler, S., Guenther, E. W., Henning, T., Jeffers, S. V., Kaminski, A., Kürster, M., Lafarga, M., Martín, E. L., Montes, D., Morales, J. C., Schmitt, J. H. M. M., and Zechmeister, M. Wed .
"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". United States. doi:https://doi.org/10.1051/0004-6361/201935679. https://www.osti.gov/servlets/purl/1577586.
@article{osti_1577586,
title = {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},
author = {Passegger, V. M. and Schweitzer, A. and Shulyak, D. and Nagel, E. and Hauschildt, P. H. and Reiners, A. and Amado, P. J. and Caballero, J. A. and Cortés-Contreras, M. and Domínguez-Fernández, A. J. and Quirrenbach, A. and Ribas, I. and Azzaro, M. and Anglada-Escudé, G. and Bauer, F. F. and Béjar, V. J. S. and Dreizler, S. and Guenther, E. W. and Henning, T. and Jeffers, S. V. and Kaminski, A. and Kürster, M. and Lafarga, M. and Martín, E. L. and Montes, D. and Morales, J. C. and Schmitt, J. H. M. M. and Zechmeister, M.},
abstractNote = {In this paper, 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.},
doi = {10.1051/0004-6361/201935679},
journal = {Astronomy and Astrophysics},
number = ,
volume = 627,
place = {United States},
year = {2019},
month = {7}
}
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