Discovery of the most compact 3+1-type quadruple star system TIC 120362137.

Borkovits, Tamás; Rappaport, Saul A; Chen, Hai-Liang; Torres, Guillermo; Mitnyan, Tibor; Kostov, Veselin B; Powell, Brian P; Pribulla, Theo et al. · Nat Commun · 2026

basic_science · Level V

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Abstract

Hierarchical multiple stellar systems with short outer periods comprise an important subgroup of multiple star systems. In this paper we present the discovery and spectro-photodynamical analysis of the most compact known 3+1 quadruple stellar system, TIC 120362137. Through investigations of the observations made with the TESS satellite and ground-based follow up measurements, we find that the system consists of an eclipsing binary with a few-day-period that in turn eclipses, and is eclipsed by, a third star on a P<sub>mid</sub> = 51.3 d orbit. This inner subsystem, which contains three stars that are more massive and hotter than the Sun, is more spatially compact than Mercury's orbit around our Sun, and is orbited by a fourth Sun-like star with a period P<sub>out</sub> = 1046 d. We detect the spectral lines of all four stars, making this system the most thoroughly studied 3+1 type quadruple stellar system. The future evolution of TIC 120362137 is also modeled, and we conclude that this entire system will likely end up as a pair of white dwarfs.