Detection of superhumps in Gaia23bcv
ATel #17398; D. V. Zazubyk (ASPD TShNU of Kyiv), W. Ogloza (University of National Education Commission & Planetarium - Silesian Science Park) N. Karaman (Astrophysics Application and Research Center, Adiyaman University, Adiyaman, Turkiye) A. O. Simon, D. Yu. Rusanova (ASPD TShNU of Kyiv)
on 18 Sep 2025; 17:55 UT
Credential Certification: Andrew Simon (skazhenijandrew@gmail.com)
Subjects: Optical, Cataclysmic Variable, Transient, Variables
We report the results of photometric observations of Gaia23bcv/ASASSN-18acd/ZTF18acxgvaf conducted on September 17-18, 2025, with the ADYU60 f/6.5 reflector at the Observatory of Adiyaman University.
We developed an alerting system that allows us to monitor brightness variations of selected objects using the BHTom facility. Thanks to our system, we detected the onset of an outburst in Gaia23bcv. Observations of the target began immediately after the notification was received. Data obtained at the Observatory of Adiyaman University on 2025-09-17/18 (JD 2460936.2303-2460936.5810) cover more than 8 hours. The resulting light curve (Fig. 1) clearly shows strong variability with a period of (0.06809 ± 0.00635)d and an amplitude of about 0.3 mag (Fig. 2), derived using the Lomb-Scargle periodogram as implemented in SciPy (scipy.signal.lombscargle). For photometry we used star #155 from the AAVSO Sky Chart X40770XB as the reference star.
Combining our own data with that collected via BHTom, we find that the amplitude of the current outburst exceeds 5 mag. Considering this amplitude, together with the detected period of (0.06809 ± 0.00635) d and the characteristic variability amplitude of 0.3 mag, we conclude that Gaia23bcv is currently undergoing a superoutburst and was previously correctly classified as an SU UMa-type dwarf nova.
Further observations are strongly encouraged.
