We report the discovery of a compact, coplanar, quadruply-lined, eclipsing quadruple star system from TESS data, TIC 454140642, also known as TYC 0074-01254-1. The target was first detected in Sector 5 with 30-min cadence in Full-Frame Images and then observed in Sector 32 with 2-min cadence. The light curve exhibits two sets of primary and secondary eclipses with periods of PA = 13.624 days (binary A) and PB = 10.393 days (binary B). Analysis of archival and follow-up data shows clear eclipse-timing variations and divergent radial velocities, indicating dynamical interactions between the two binaries and confirming that they form a gravitationally-bound quadruple system with a 2+2 hierarchy. The Aa+Ab binary, Ba+Bb binary, and A-B system are aligned with respect to each other within a fraction of a degree: the respective mutual orbital inclinations are 0.25 degrees (A vs B), 0.37 degrees (A vs A-B), and 0.47 degrees (B vs A-B). The A-B system has an orbital period of 432 days - the second shortest amongst confirmed quadruple systems - and an orbital eccentricity of 0.3.
@article{arxiv.2105.12586,
title = {TIC 454140642: A Compact, Coplanar, Quadruple-lined Quadruple Star System Consisting of Two Eclipsing Binaries},
author = {Veselin B. Kostov and Brian P. Powell and Guillermo Torres and Tamas Borkovits and Saul A. Rappaport and Andrei Tokovinin and Petr Zasche and David Anderson and Thomas Barclay and Perry Berlind and Peyton Brown and Michael L. Calkins and Karen A. Collins and Kevin I. Collins and Dennis M. Conti and Gilbert A. Esquerdo and Coel Hellier and Eric L. N. Jensen and Jacob Kamler and Ethan Kruse and David W. Latham and Martin Masek and Felipe Murgas and Greg Olmschenk and Jerome A. Orosz and Andras Pal and Enric Palle and Richard P. Schwarz and Chris Stockdale and Daniel Tamayo and Robert Uhlar and William F. Welsh and Richard West},
journal= {arXiv preprint arXiv:2105.12586},
year = {2021}
}
Comments
25 pages, 17 figures, 9 tables; accepted for publication in the Astrophysical Journal