BG Ind: the nearest doubly eclipsing, compact hierarchical quadruple system

BG Ind is a well studied, bright, nearby binary consisting of pair F stars in 1.46-day orbit. We have discovered the TESS lightcurve for TIC 229804573 (aka Ind) second eclipsing system with 0.53-day. Our subsequent analyses recent and archival ground-based photometric radial velocity data, reveal that two binaries are gravitationally bound 721-day period, moderately eccentric present results joint spectro-photodynamical analysis eclipse timing variation curves both based on lightcurve, data spectral energy distribution, coupled use PARSEC stellar isochrones. confirm prior studies which found brighter A consists slightly evolved F-type refined masses 1.32 1.43 $M_\odot$, radii 1.59 2.34 $R_\odot$. The previously unknown B has less massive 0.69 0.64 $M_\odot$ 0.61 Based number different arguments we discuss, conclude three orbital planes likely aligned to within 17$^\circ$.