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Open Astronomy

formerly Baltic Astronomy

Editor-in-Chief: Barbuy, Beatriz

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Volume 26, Issue 1


Further Evidence of a Brown Dwarf Orbiting the Post-Common Envelope Eclipsing Binary V470 Cam (HS 0705+6700)

David Bogensberger / Fraser Clarke / Anthony Eugene Lynas-Gray
  • Corresponding author
  • Department of Physics, University of Oxford, Oxford, United Kingdom of Great Britain and Northern Ireland
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Published Online: 2017-12-22 | DOI: https://doi.org/10.1515/astro-2017-0015


Several post-common envelope binaries have slightly increasing, decreasing or oscillating orbital periods. One of several possible explanations is light travel-time changes, caused by the binary centre-of-mass being perturbed by the gravitational pull of a third body. Further studies are necessary because it is not clear how a third body could have survived subdwarf progenitor mass-loss at the tip of the Red Giant Branch, or formed subsequently. Thirty-nine primary eclipse times for V470 Cam were secured with the Philip Wetton Telescope during the period 2016 November 25th to 2017 January 27th. Available eclipse timings suggest a brown dwarf tertiary having a mass of at least 0.0236(40) M, an elliptical orbit with an eccentricity of 0.376(98) and an orbital period of 11.77(67) years about the binary centreof- mass. The mass and orbit suggest a hybrid formation, in which some ejected material from the subdwarf progenitor was accreted on to a precursor tertiary component, although additional observations would be needed to confirm this interpretation and investigate other possible origins for the binary orbital period change.

Keywords: stars: subdwarfs; stars: binaries eclipsing; stars: binaries close


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About the article

Received: 2017-08-18

Accepted: 2017-10-13

Published Online: 2017-12-22

Published in Print: 2017-12-20

Citation Information: Open Astronomy, Volume 26, Issue 1, Pages 134–138, ISSN (Online) 2543-6376, DOI: https://doi.org/10.1515/astro-2017-0015.

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© 2017. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

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