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We present the study of the CoRoT transiting planet candidate 101186644, alsonamed LRc01_E1_4780. Analysis of the CoRoT lightcurve and the HARPSspectroscopic follow-up observations of this faint (m_V = 16) candidaterevealed an eclipsing binary composed of a late F-type primary (T_eff = 6090+/- 200 K) and a low-mass, dense late M-dwarf secondary on an eccentric (e =0.4) orbit with a period of ~20.7 days. The M-dwarf has a mass of 0.096 +/-0.011 M_Sun, and a radius of 0.104 +0.026/-0.006 R_Sun, which possibly makes itthe smallest and densest late M-dwarf reported so far. Unlike the claim thattheoretical models predict radii that are 5%-15% smaller than measured forlow-mass stars, this one seems to have a radius that is consistent and mighteven be below the radius predicted by theoretical models.

CoRoT 101186644: A transiting low-mass dense M-dwarf on an eccentric 20.7-day period orbit around a late F-star