The Loudest Stellar Heartbeat: Characterizing the most extreme amplitude heartbeat star system
T. Jayasinghe, C. S. Kochanek, J. Strader, K. Z. Stanek, P. J., Vallely, Todd A. Thompson, J. T. Hinkle, B. J. Shappee, A. K. Dupree, K., Auchettl, L. Chomiuk, E. Aydi, K. Dage, A. Hughes, L. Shishkovsky, K. V., Sokolovsky, S. Swihart, K. T. Voggel, I. B. Thompson

TL;DR
This paper characterizes the most extreme amplitude heartbeat star system MACHO 80.7443.1718 in the LMC, revealing its massive components, eccentric orbit, circumstellar disk dynamics, and tidally excited oscillations, expanding understanding of such rare stellar systems.
Contribution
It provides the first detailed characterization of the most extreme amplitude and massive heartbeat star system, including its orbital, stellar, and circumstellar properties.
Findings
Largest variability amplitude among known heartbeat stars
Massive binary with a B0 Iae supergiant and O9.5V companion
Circumstellar disk dissipates at periastron and re-emerges
Abstract
We characterize the extreme heartbeat star system MACHO 80.7443.1718 in the LMC using TESS photometry and spectroscopic observations from the Magellan Inamori Kyocera Echelle (MIKE) and SOAR Goodman spectographs. MACHO 80.7443.1718 was first identified as a heartbeat star system in the All-Sky Automated Survey for SuperNovae (ASAS-SN) with . MACHO 80.7443.1718 is a young (~Myr), massive binary, composed of a B0 Iae supergiant with and an O9.5V secondary with on an eccentric () orbit. In addition to having the largest variability amplitude amongst all known heartbeats stars, MACHO 80.7443.1718 is also one of the most massive heartbeat stars yet discovered. The B[e] supergiant has Balmer emission lines and permitted/forbidden metallic emission lines associated with a circumstellar…
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