@article{10272/21760,
year = {2013},
url = {https://hdl.handle.net/10272/21760},
abstract = {In 2011 October an optical transient was reported in Pegasus as a possible nova. The object had an ultraviolet counterpart, GALEX J215818.5+241924. In this paper we present follow-up photometry of the object which revealed the presence of superhumps, with peak-to-peak amplitude of up to 0.22 magnitudes, diagnostic of it being a member of the SU UMa family of dwarf novae. The outburst amplitude was 4.6 magnitudes and it lasted at least 10 days, with a maximum brightness of magnitude 14.3. We determined the mean superhump period from our first 5 nights of observations as Psh = 0.06728(21) d. However analysis of the O-C residuals showed a dramatic evolution in Psh during the outburst. During the first part of the plateau phase the period increased with dPsh/dt = +2.67(15) x 10-4. There was then an abrupt change following which the period decreased with dPsh/dt = -2.08(9)10-4. We found a signal in the power spectrum of the photometry which we tentatively interpret as the orbital signal with Porb = 0.06606(35) d. Thus the superhump period excess was ε = 0.020(8), such value being consistent with other SU UMa systems of similar orbital period.},
publisher = {Cornell University},
title = {The first confirmed superoutburst of the dwarf nova GALEX J215818.5+241924},
doi = {10.48550/ARXIV.1205.0898},
author = {Shears, Jeremy and Koff, Robert and Masi, G. and Miguel Agustino, Enrique de and Miller, Ian and Roberts, George and Sabo, Richard and Stein, William and Ulowetz, Joseph},
}