The first confirmed superoutburst of the SU UMa type dwarf nova SDSS J083931.35+282824.0

TL;DR

This paper reports the first confirmed superoutburst of the dwarf nova SDSS J083931.35+282824.0, including photometric observations, superhump period analysis, and implications for its classification as an SU UMa type dwarf nova.

Contribution

First observational confirmation of a superoutburst in SDSS J083931.35+282824.0 with detailed superhump period measurements and analysis.

Findings

Superoutburst amplitude of at least 5.8 magnitudes.

Superhump period decreased from 0.07836 to 0.07800 days.

Tentative orbital period estimate of 0.07531 days.

Abstract

We report unfiltered CCD photometry of the first confirmed superoutburst of the recently discovered dwarf nova, SDSS J083931.35+282824.0 in April 2010. From a quiescence magnitude of ~19.8 it rose to 14.0, an outburst amplitude of at least 5.8 magnitudes. Only the plateau phase of the outburst was observed during which superhumps with peak-to-peak amplitude of up to 0.28 magnitudes were present, confirming this to be an SU UMa type dwarf nova. The mean superhump period was Psh = 0.07836(2) during the first 3 days and this subsequently decreased to 0.07800(3) d. Analysis of the data revealed tentative evidence for an orbital period Porb = 0.07531(25) d. The fractional superhump period excess was epsilon = 0.039(6), which is consistent with other dwarf novae of similar orbital period.