We report the discovery of 2M1222-57 as a low-mass, pre-main-sequence (PMS)
eclipsing binary (EB) in the Lower Centaurus Crux (LCC) association for which,
using Gaia parallaxes and proper motions with a neural-net age estimator, we
determine an age of 16.2±2.2 Myr. The broadband spectral energy
distribution (SED) shows clear excess at ~10 um indicative of a circumbinary
disk, and new speckle-imaging observations reveal a faint, tertiary companion
separated by ~100 AU. H-alpha emission is modulated on the orbital period,
consistent with theoretical models of orbitally pulsed accretion streams
reaching from the inner disk edge to the central stars. From a joint analysis
of spectroscopically determined radial velocities and TESS light curves,
together with additional tight constraints provided by the SED and the Gaia
parallax, we measure masses for the eclipsing stars of 0.74 Msun and 0.67 Msun;
radii of 0.98 Rsun and 0.94 Rsun; and effective temperatures of 3750 K and 3645
K. The masses and radii of both stars are measured to an accuracy of ~1%. The
measured radii are inflated, and the temperatures suppressed, relative to
predictions of standard PMS evolutionary models at the age of LCC; also, the Li
abundances are ~2 dex less depleted than predicted by those models. However,
models that account for the global and internal effects of surface magnetic
fields are able to simultaneously reproduce the measured radii, temperatures,
and Li abundances at an age of 17.0±0.5 Myr. Altogether, the 2M1222-57
system presents very strong evidence that magnetic activity in young stars
alters both their global properties and the physics of their interiors.Comment: 23 pages, 19 figures, accepted by Ap