An eclipsing post-common-envelope binary in the field of the Kepler mission

Authors

  • J. M. Almenara,

    Corresponding author
    1. Instituto de Astrofísica de Canarias, C/Vía Láctea S/N, E-38200 La Laguna, Spain
    2. Departamento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Spain
    3. Laboratoire d’Astrophysique de Marseille, UMR 6110 CNRS, Technopole de Marseille-Étoile, F-13388 Marseille cedex 13, France
      E-mail: josemanuel.almenara@oamp.fr
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  • R. Alonso,

    1. Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
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  • M. Rabus,

    1. Instituto de Astrofísica de Canarias, C/Vía Láctea S/N, E-38200 La Laguna, Spain
    2. Departamento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Spain
    3. Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile
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  • C. Lázaro,

    1. Instituto de Astrofísica de Canarias, C/Vía Láctea S/N, E-38200 La Laguna, Spain
    2. Departamento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Spain
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  • M. J. Arévalo,

    1. Instituto de Astrofísica de Canarias, C/Vía Láctea S/N, E-38200 La Laguna, Spain
    2. Departamento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Spain
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  • J. A. Belmonte,

    1. Instituto de Astrofísica de Canarias, C/Vía Láctea S/N, E-38200 La Laguna, Spain
    2. Departamento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Spain
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  • H. J. Deeg,

    1. Instituto de Astrofísica de Canarias, C/Vía Láctea S/N, E-38200 La Laguna, Spain
    2. Departamento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Spain
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  • T. M. Brown,

    1. Las Cumbres Observatory Global Telescope, Goleta, CA 93117, USA
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  • H. Vázquez Ramió

    1. Instituto de Astrofísica de Canarias, C/Vía Láctea S/N, E-38200 La Laguna, Spain
    2. Departamento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Spain
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E-mail: josemanuel.almenara@oamp.fr

ABSTRACT

We present a new eclipsing post-common-envelope binary, identified inside the Kepler field prior to the launch of the spacecraft. Multifilter photometry and radial velocity data are analysed with an eclipsing-binary modelling code to determine the physical parameters of the binary. Spectra of the system within the primary eclipse and uneclipsed allow us to identify the spectral characteristics of the primary and secondary components. The primary component of the binary is a DA white dwarf, with M≃ 0.61 M, log g≃ 7.95 and Teff≃ 20 500 K.

The detection of two flares and the emission signatures displayed in the spectra show that the secondary component of the system is chromospherically active and is classified as an active M4 main-sequence star. Its mass, radius and temperature are estimated as M≃ 0.39 M, R≃ 0.37 R and Teff≃ 3200 K. The ephemeris of the system is HJD = 245 3590.436 126(10) + 0.350 468 722(6) ×E.

This binary is a new post-common-envelope binary (PCEB), with physical parameters within the range found in other systems of this small group of evolved binaries.

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