The orbital and superhump periods of the deeply eclipsing dwarf nova SDSS J122740.83+513925.9

TL;DR

This study reports the first confirmed superoutburst of the eclipsing dwarf nova SDSS J122740.83+513925.9, measuring its orbital and superhump periods, and analyzing eclipse and superhump characteristics.

Contribution

It provides the first detailed measurements of orbital and superhump periods for this system, confirming its classification as a UGSU-type dwarf nova.

Findings

Orbital period measured as 0.06296 days.

Superhump period identified as 0.0653 days.

Superhump period excess of 3.7%.

Abstract

During June 2007 the first confirmed superoutburst of the eclipsing dwarf nova SDSS J122740.83+513925.9 was observed using CCD photometry. The outburst amplitude was at least 4.7 magnitudes. The orbital period was measured as 0.06296(5) d from times of the 31 observed eclipses. Time series photometry also revealed superhumps with a period of 0.0653(3) d, thereby establishing it to be a UGSU-type system. The superhump period excess was 3.7% and the maximum peak-to-peak amplitude of the superhumps was 0.35 magnitudes. The eclipse duration declined from a maximum of 23 min at the peak of the outburst to about 12 mins towards the end. The depth of the eclipses was correlated with the beat period between the orbital and superhump periods.