SIMBAD references

2014A&A...562A..50G - Astronomy and Astrophysics, volume 562A, 50-50 (2014/2-1)

CoRoT 223992193: A new, low-mass, pre-main sequence eclipsing binary with evidence of a circumbinary disk.

GILLEN E., AIGRAIN S., McQUILLAN A., BOUVIER J., HODGKIN S., ALENCAR S.H.P., TERQUEM C., SOUTHWORTH J., GIBSON N.P., CODY A., LENDL M., MORALES-CALDERON M., FAVATA F., STAUFFER J. and MICELA G.

Abstract (from CDS):

We present the discovery of CoRoT 223992193, a double-lined, detached eclipsing binary, comprising two pre-main sequence M dwarfs, discovered by the CoRoT space mission during a 23-day observation of the 3Myr old NGC 2264 star-forming region. Using multi-epoch optical and near-IR follow-up spectroscopy with FLAMES on the Very Large Telescope and ISIS on the William Herschel Telescope we obtain a full orbital solution and derive the fundamental parameters of both stars by modelling the light curve and radial velocity data. The orbit is circular and has a period of 3.8745745±0.0000014 days. The masses and radii of the two stars are 0.67±0.01 and 0.495±0.007M and 1.30±0.04 and 1.11+0.04–0.05R, respectively. This system is a useful test of evolutionary models of young low-mass stars, as it lies in a region of parameter space where observational constraints are scarce; comparison with these models indicates an apparent age of ∼3.5-6Myr. The systemic velocity is within 1σ of the cluster value which, along with the presence of lithium absorption, strongly indicates cluster membership. The CoRoT light curve also contains large-amplitude, rapidly evolving out-of-eclipse variations, which are difficult to explain using starspots alone. The system's spectral energy distribution reveals a mid-infrared excess, which we model as thermal emission from a small amount of dust located in 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.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - stars: pre-main sequence - binaries: spectroscopic - stars: individual: CoRoT 223992193 - open clusters and associations: individual: NGC 2264 - protoplanetary disks

Simbad objects: 23

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2019.12.07-10:49:28

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