Kavli Affiliate: Saul A. Rappaport
| First 5 Authors: Brian P. Powell, Guillermo Torres, Veselin B. Kostov, Tamás Borkovits, Saul A. Rappaport
| Summary:
We present the discovery of two quadruple star systems — TIC 285853156 and
TIC 392229331 — each consisting of two bound eclipsing binary stars. Among the
most compact quadruples known, TIC 392229331 and TIC 285853156 have the second
and third shortest outer orbital periods (145 days and 152 days, respectively)
after BU Canis Minoris (122 days, Pribulla et al. 2023). We demonstrate that
both systems are long-term dynamically stable despite substantial outer orbital
eccentricities (0.33 for TIC 285853156 and 0.56 for TIC 392229331). We
previously reported these systems in Kostov et al. (2022) and Kostov et al.
(2024) as 2+2 hierarchical quadruple candidates producing two sets of primary
and secondary eclipses in TESS data, as well as prominent eclipse timing
variations on both binary components. We combine all available TESS data and
new spectroscopic observations into a comprehensive photodynamical model,
proving that the component binary stars are gravitationally bound in both
systems and finding accurate stellar and orbital parameters for both systems,
including very precise determinations of the outer periods. TIC 285853156 and
TIC 392229331 represent the latest addition to the small population of
well-characterized proven quadruple systems dynamically interacting on
detectable timescales.
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