An Extreme Amplitude, Massive Heartbeat System in the LMC Characterized Using ASAS-SN and TESS. (arXiv:1901.00005v1 [astro-ph.SR])

An Extreme Amplitude, Massive Heartbeat System in the LMC Characterized Using ASAS-SN and TESS. (arXiv:1901.00005v1 [astro-ph.SR])
<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 $rm P_{orb}=32.83pm0.05$ 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 $omega=53.5$ deg,
$i=45.7$ deg and $e=0.58$. We also carried out a frequency analysis to identify
the pulsation frequencies corresponding to the tidally excited oscillations.

http://arxiv.org/icons/sfx.gif