ASAS-SN Identification of a Detached Eclipsing Binary System with a $\sim7.3$ Year Period

TL;DR

This paper reports the discovery of a long-period, eccentric detached eclipsing binary system with a 7.3-year orbital period, identified through combined multi-year photometric data from multiple surveys.

Contribution

It introduces a newly identified long-period binary system with detailed orbital characteristics, expanding knowledge of such rare stellar configurations.

Findings

Orbital period of approximately 7.3 years.

Eccentricity of at least 0.2.

Primary eclipse duration of about 160 days.

Abstract

We report the identification of a new, long period detached eclipsing binary by the All-Sky Automated Survey for Supernovae (ASAS-SN). Combining V-band photometry from ASAS-SN, ASAS and KELT, we constructed a light curve spanning 2006-2018. ASASSN-V J192543.72+402619.0 is an eccentric detached eclipsing binary with an orbital period of $P\sim7.3$ yr, a minimum orbital eccentricity of $e_{min}\sim0.2$ and a primary eclipse lasting $\sim160$ d. We also detect a secondary eclipse that is $\sim 0.6$ mag shallower. Multi-band photometry suggests that the more luminous component of the binary is an M-giant. Further photometric and spectroscopic observations are encouraged.