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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

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 » from visible spectra and visible and NIR spectra combined are in better agreement than those derived from the same spectra in the NIR alone.« less

Authors:
 [1];  [1];  [2];  [1];  [1];  [3];  [4];  [5];  [5];  [6];  [7];  [8];  [9];  [10];  [4];  [11];  [3];  [12];  [13];  [3] more »;  [7];  [13];  [8];  [5];  [6];  [8];  [1];  [3] « less
  1. Hamburger Sternwarte, Hamburg (Germany)
  2. Max Planck Inst. for Solar System Research, Göttingen (Germany)
  3. Georg-August-Univ., Göttingen (Germany). Institut für Astrophysik
  4. Inst. de Astrofísica de Andalucía (IAA-CSIC), Granada (Spain)
  5. Centro de Astrobiología (CSIC-INTA), Madrid (Spain)
  6. Univ. Complutense, Madrid (Spain)
  7. Univ. Heidelberg (Germany)
  8. Inst. de Ciències de l’Espai (CSIC-IEEC), Barcelona (Spain); Inst. d’Estudis Espacials de Catalunya (IEEC), Barcelona (Spain)
  9. Centro Astronómico Hispano-Alemán (CSIC-MPG), Almería (Spain). Observatorio Astronómico de Calar Alto
  10. Inst. de Astrofísica de Andalucía (IAA-CSIC), Granada (Spain); Queen Mary Univ. of London (United Kingdom)
  11. Inst. de Astrofísica de Canarias, Tenerife (Spain); Univ. de La Laguna, Tenerife (Spain)
  12. Thüringer Landessternwarte Tautenburg (Germany)
  13. 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. 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. 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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Figures / Tables:

Fig. 1 Fig. 1: Surface gravity log g as a function of effective temperature Teff . Left panel: comparison of Lyon group’s BCAH98, BHAC15 models, and PARSEC models for [M/H] = 0 and fixed age of 5 Gyr. Right panel: PARSEC models for [M/H] = 0 and variable age from 0.01 tomore » 10 Gyr. The gray vertical lines indicate the temperature range of our PHOENIX-SESAM grid from 2900 to 4500 K.« less

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  • Brown, A. G. A.; Vallenari, A.; Prusti, T.
  • EDP Sciences
  • DOI: 10.48350/158409

Solar Chemical Abundances Determined with a CO5BOLD 3D Model Atmosphere
text, January 2010


A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
text, January 2013


Near-infrared Metallicities, Radial Velocities and Spectral Types for 447 Nearby M Dwarfs
text, January 2013


Prospecting in Ultracool Dwarfs: Measuring the Metallicities of Mid- and Late-M Dwarfs
text, January 2014


Improving PARSEC models for very low mass stars
text, January 2014


Calibrating echelle spectrographs with Fabry-Perot etalons
text, January 2015


Strong dipole magnetic fields in fast rotating fully convective stars
text, January 2018


Chemo-kinematic ages of eccentric-planet-hosting M dwarf stars
text, January 2018


The Limiting Effects of Dust in Brown Dwarf Model Atmospheres
text, January 2001


Parallel Implementation of the PHOENIX Generalized Stellar Atmosphere Program
text, January 1996


Works referencing / citing this record:

Gliese 49: activity evolution and detection of a super-Earth: A HADES and CARMENES collaboration
journal, April 2019


The CARMENES search for exoplanets around M dwarfs: The He I triplet at 10830 Å across the M dwarf sequence
journal, November 2019


Bias and robustness of eccentricity estimates from radial velocity data
journal, July 2019

  • Hara, Nathan C.; Boué, G.; Laskar, J.
  • Monthly Notices of the Royal Astronomical Society, Vol. 489, Issue 1
  • DOI: 10.1093/mnras/stz1849

Dynamical interactions in the planetary system GJ4276
journal, September 2019

  • Horrobin, Fergus; Rein, Hanno
  • Monthly Notices of the Royal Astronomical Society, Vol. 490, Issue 2
  • DOI: 10.1093/mnras/stz2584

Magnetic Inflation and Stellar Mass. V. Intensification and Saturation of M-dwarf Absorption Lines with Rossby Number
journal, January 2020

  • Muirhead, Philip S.; Veyette, Mark J.; Newton, Elisabeth R.
  • The Astronomical Journal, Vol. 159, Issue 2
  • DOI: 10.3847/1538-3881/ab5d3d