A new, low-mass, pre-main sequence eclipsing binary with evidence of a circumbinary disk

Ed Gillen, Suzanne Aigrain, Amy McQuillan, Jerome Bouvier, Simon Hodgkin, Silvia Alencar, Caroline Terquem, John Southworth, Neale Gibson, Ann Marie Cody, Monika Lendl, Maria Morales-Calderón, Fabio Favata, John Stauffer, Giusi Micela

Research output: Contribution to conferencePosterpeer-review

Abstract

We present the discovery of a double-lined, detached eclipsing binary (EB), comprising two pre-main sequence M-dwarfs, in the 3 Myr old NGC 2264 star-forming region. Eclipses were detected in this system, during a continuous 23-day observation of NGC 2264 by the CoRoT space mission in 2008. Multi-epoch optical and near-IR follow-up spectroscopy with VLT/FLAMES and WHT/ISIS yielded a full orbital solution. We derive fundamental stellar parameters by modelling the light curve and radial velocity data, finding that the two stars travel on essentially circular orbits with a period of 3.8745745 ± 0.0000014 days and have masses of 0.67 ± 0.01 and 0.495 ± 0.007 M_sun with corresponding radii of 1.30 ± 0.04 and 1.11 ± 0.05 R_sun. The CoRoT light curve also contains large-amplitude, rapidly evolving out-of-eclipse variations, which are difficult to explain with star spots alone. SED modelling of the system's broadband optical and infrared magnitudes reveals a mid-IR excess, which we model as emission from a small amount of dust located within the inner cavity of a circumbinary disk. In turn, this opens up the possibility that some of the out-of-eclipse variability could be due to occultations of the central stars by material located at the inner edge or in the central cavity of the circumbinary disk.
Original languageEnglish
Pages1
Publication statusPublished - 15 Jul 2013
Externally publishedYes
EventProtostars and Planets VI - Heidelberg, Germany
Duration: 15 Jul 201320 Jul 2013

Conference

ConferenceProtostars and Planets VI
CountryGermany
CityHeidelberg
Period15/07/201320/07/2013

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