ASASSN-22el: A Deep Eclipse Event
ATel #15308; M. Rizzo Smith, K. Z. Stanek, D. M. Rowan, C. S. Kochanek, T. Jayasinghe, C. Christy, T. A. Thompson (OSU), B. J. Shappee (Univ. of Hawaii), T. W.-S. Holoien (Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), Subo Dong (KIAA-PKU), M. Stritzinger (Aarhus)
on 2 Apr 2022; 12:46 UT
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)
Subjects: Optical, Variables
During the ongoing All-Sky Automated Survey for Supernovae (ASAS-SN, Shappee et al. 2014, Kochanek et al. 2017), using data from the quadruple 14-cm ``Cassius'', ``Payne-Gaposchkin'',``Leavitt'', and ``Paczynski'' telescopes, we identified a star undergoing a deep eclipse. ASASSN-22el (Pan-STARRS PS1 source 102571143989354571 at RA=07:37:35.79, DEC=-04:31:17.2, g=13.3 mag). It was first observed by ASAS-SN on UT 2014-12-16. Presently, ASASSN-22el has more than ~5500 data points.
ASASSN-22el has a quiescent mean magnitude of g~13.3 (V~13.1). The latest ASAS-SN photometry shows that ASASSN-22el started to dim around UT 2022-03-31. As of UT 2022-04-01 ASASSN-22el has faded to g~14.4. In the full ASAS-SN light curve there was a previous episode of dimming in the V-band data. On UT 2017-09-19 ASASSN-22el faded to V~14.0, and returned to the mean V-band magnitude by 2017-09-23. Additionally, ASASSN-22el has been observed in sector 7 and 34 of TESS, and has periodic, low-amplitude (~0.1 mag) variability on a timescale of ~4.7 days.
We thank Las Cumbres Observatory and its staff for their continued support of ASAS-SN. ASAS-SN is funded in part by the Gordon and Betty Moore Foundation through grants GBMF5490 and GBMF10501 to the Ohio State University, Alfred P. Sloan Foundation grant G-2021-14192, NSF grant AST-1908570, the Mt. Cuba Astronomical Foundation, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, and the Chinese Academy of Sciences South America Center for Astronomy (CASSACA).
