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Optical classification of Gaia15afz as a SU UMa type dwarf nova

ATel #13314; A. Simon (National Taras Shevchenko University of Kyiv, Ukraine), V. Godunova (ICAMER Observatory of NASU, Ukraine), I. Izviekova (ICAMER Observatory of NASU, Ukraine), E. Pavlenko (Crimean Astrophysical Observatory, Republic of Crimea), V. Vasylenko (National Taras Shevchenko University of Kyiv, Ukraine)
on 27 Nov 2019; 01:05 UT
Credential Certification: Andrew Simon (skazhenijandrew@gmail.com)

Subjects: Optical, Cataclysmic Variable, Transient

We report on photometric observations of Gaia15afz, which were performed on 2019, November 25 with the Zeiss-600 telescope (f/12.9 Cassegrain) at the Terskol Observatory. The blue hostless transient Gaia15afz was discovered on 2015-05-25 by A. Delgado et al. (University of Cambridge) on behalf of the Gaia Alerts team at magnitude G = 15.72. In 2019, our follow-up photometry revealed some outbursts of this object (https://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia15afz/followup)/ , and now Gaia15afz is undergoing a new outburst. On its light curve obtained over approximately 3 hours in R-band, we detected variations with a period of about 0.065(2)d and amplitude of 0.2 mag that is peculiar to a SU UMa type dwarf nova during superoutburst. Further observations are encouraged in order to more exactly define the superhump period of Gaia15afz and its evolution. We acknowledge ESA Gaia, DPAC and the Photometric Science Alerts Team (http://gsaweb.ast.cam.ac.uk/alerts).