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TIC 470710327, a massive compact hierarchical triple-star system, wasrecently identified by NASA's Transiting Exoplanet Survey Satellite (TESS). TIC470710327 is comprised of a compact (1.10 d) circular eclipsing binary, withtotal mass $\approx 10.9-13.2\ \rm{M_{\odot}}$, and a more massive ($\approx14-17\ \rm{M_{\odot}}$) eccentric non-eclipsing tertiary in a $52.04$ d orbit.Here we present a progenitor scenario for TIC 470710327 in which '2+2'quadruple dynamics result in Zeipel-Lidov-Kozai (ZLK) resonances that lead to acontact phase of the more massive binary. In this scenario, the two binarysystems should form in a very similar manner, and dynamics trigger the mergerof the more massive binary either during late phases of star formation orseveral Myr after the zero-age main sequence (ZAMS), when the stars begin toexpand. Any evidence that the tertiary is a highly-magnetised ($\sim 1-10$ kG),slowly-rotating blue main-sequence star would hint towards a quadruple origin.Finally, our scenario suggests that the population of inclined, compactmultiple-stellar systems is reduced into co-planar systems, via mergers, lateduring star formation or early in the main sequence. The elucidation of theorigin of TIC 470710327 is crucial in our understanding of multiplemassive-star formation and evolution.

Mergers prompted by dynamics in compact, multiple-star systems: a stellar-reduction case for the massive triple TIC 470710327