Mon-735: A new low-mass pre-main sequence eclipsing binary in NGC 2264

Abstract

We present Mon-735, a detached double-lined eclipsing binary (EB) member of the $\sim$3 Myr old NGC 2264 star forming region, detected by Spitzer. We simultaneously model the Spitzer light curves, follow-up Keck/HIRES radial velocities, and the system's spectral energy distribution to determine self-consistent masses, radii and effective temperatures for both stars. We find that Mon-735 comprises two pre-main sequence M dwarfs with component masses of $M=0.2918\pm 0.0099$ and $0.2661\pm 0.0095$ ${\mathrm{M}}_{\odot }$, radii of $R=0.762\pm 0.022$ and $0.748\pm 0.023$ ${\mathrm{R}}_{\odot }$, and effective temperatures of $T_{\mathrm{eff}}=3260\pm 73$ and $3213\pm 73$ $\mathrm{K}$. The two stars travel on circular orbits around their common centre of mass in $P=1.9751388\pm 0.0000050$ days. We compare our results for Mon-735, along with another EB in NGC 2264 (CoRoT 223992193), to the predictions of five stellar evolution models. These suggest that the lower mass EB system Mon-735 is older than CoRoT 223992193 in the mass-radius diagram (MRD) and, to a lesser extent, in the Hertzsprung-Russell diagram (HRD). The MRD ages of Mon-735 and CoRoT 223992193 are $\sim$7-9 and 4-6 Myr, respectively, with the two components in each EB system possessing consistent ages.

18 pages, 14 figures, 5 tables, accepted for publication in MNRAS

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