An Extreme Amplitude, Massive Heartbeat System in the LMC Characterized Using ASAS-SN and TESS. (arXiv:1901.00005v2 [astro-ph.SR] UPDATED)

An Extreme Amplitude, Massive Heartbeat System in the LMC Characterized Using ASAS-SN and TESS. (arXiv:1901.00005v2 [astro-ph.SR] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Jayasinghe_T/0/1/0/all/0/1">T. Jayasinghe</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Stanek_K/0/1/0/all/0/1">K. Z. Stanek</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kochanek_C/0/1/0/all/0/1">C. S. Kochanek</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Thompson_T/0/1/0/all/0/1">Todd A. Thompson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Shappee_B/0/1/0/all/0/1">B. J. Shappee</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fausnaugh_M/0/1/0/all/0/1">M. Fausnaugh</a>

Using ASAS-SN data, we find that the bright ($V{sim}13.5$ mag) variable star
MACHO 80.7443.1718 (ASASSN-V J052624.38-684705.6) is the most extreme heartbeat
star yet discovered. This massive binary, consisting of at least one early
B-type star, has an orbital period of $P_{rm ASAS-SN}=32.83627pm0.00846,{rm
d},$ and is located towards the LH58 OB complex in the LMC. Both the ASAS-SN
and TESS light curves show extreme brightness variations of ${sim}40%$ at
periastron and variations of ${sim}10%$ due to tidally excited oscillations
outside periastron. We fit an analytical model of the variability caused by the
tidal distortions at pericenter to find orbital parameters of $omega=-61.4$
deg, $i=44.8$ deg and $e=0.566$. We also present a frequency analysis to
identify the pulsation frequencies corresponding to the tidally excited
oscillations.

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