TIC 5724661: A Long-Period Binary with a Pulsating sdB Star and Scuti Variable
arXiv:2111.12098 · doi:10.3847/1538-4357/ac84d0
Abstract
Using TESS 20-sec cadence data, we have discovered an unusual combination of pulsating stars in what we infer to be a binary system. The binary consists of a standard Scuti star with pulsations over the range 32-41 d; this is in a likely wide orbit with a hot subdwarf B (sdB) star, which itself has a large-amplitude p-mode pulsation at 524 d. We establish constraints on the period of the putative binary by using radial velocity measurements of the ~Scuti star and show that any sdB companion star must orbit with a period greater than a few tens of days. Our identification of this sdB binary serves as an important addition to the relatively small number of sdB binaries known to have orbital periods longer than a few days. We model such a binary using {\tt MESA} and find that this system could be formed through stable, nonconservative mass transfer from either a low- or intermediate-mass progenitor, without undergoing a common envelope phase.
arXiv comment17 pages, 10 figures, accepted to ApJ
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