ASASSN-24fw: A Main Sequence Star with a Deep Dimming Event
ATel #16833; B. JoHantgen, D. M. Rowan, K. Z. Stanek, J. Callahan, C. S. Kochanek, S. A. Petz (OSU), B. J. Shappee (Univ. of Hawaii)
on 27 Sep 2024; 21:52 UT
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)
Subjects: Optical, Variables
Referred to by ATel #: 16919
Using data from the All-Sky Automated Survey for SuperNovae (ASAS-SN, Shappee et al. 2014, Kochanek et al. 2017, Hart et al. 2023 ), we found a star with a deep dimming event. ASASSN-24fw (RA = 07:05:18.96, Dec = 06:12:19.1, d ~ 1.0 kpc, Teff ~ 6600 K, G = 12.8, BP = 13.1 RP = 12.4, DR3 source_id =3152916838954800512) is a main sequence star in Gaia DR3 (Gaia Collaboration et al., 2023, A&A, 674, A1) with an extinction-corrected absolute magnitude of M_G=2.7 mag. ASAS-SN first observed the star on UT 2014-12-16 and it has ~3950 data points at this time.
ASASSN-24fw had a mean magnitude of g~13.1 mag (V~12.9 mag). The event began around UT 2024-09-16 and the star has dimmed by 2.5 mag and is currently still fading. This is the only significant dipping event seen in the ASAS-SN data. There is an infrared excess detected in WISE (W1-W2 = 0.78 mag), but no significant variability is observed in the archival WISE light curve.
We thank Las Cumbres Observatory and its staff for their continued support of ASAS-SN. ASAS-SN operations are funded in part by the Gordon and Betty Moore Foundation through grants GBMF5490 and GBMF10501 to the Ohio State University, and Alfred P. Sloan Foundation grant G-2021-14192.
