The orbital period of the eclipsing dwarf nova SDSS J081610.84+453010.2

TL;DR

This paper reports the first detection of eclipses in the dwarf nova SDSS J081610.84+453010.2, determining its orbital period and characteristics through time-resolved photometry during an outburst.

Contribution

It provides the first measurement of the orbital period and eclipse characteristics of SDSS J081610.84+453010.2, classifying it as an eclipsing dwarf nova above the period gap.

Findings

Orbital period is 0.2096 days (5.030 hours).

Eclipses are short and shallow, indicating grazing eclipses.

System experienced an 11-day outburst with 3.4 magnitude amplitude.

Abstract

We present time resolved photometry of the cataclysmic variable SDSS J081610.84+453010.2 and have established for the first time that it is an eclipsing dwarf nova. We observed an outburst of the system which lasted about 11 days and had an amplitude of 3.4 magnitudes above mean quiescence. From an analysis of the eclipse times of minimum during the outburst, we determined the orbital period as Porb = 0.2096(4) d or 5.030(10) h. The orbital period places it above the period gap in the distribution of orbital periods of dwarf novae. The eclipses are of short duration (average FWHM = 10.7 min or 0.036 of the orbital period) and shallow (average 0.4 mag during outburst and 0.6 magnitude in quiescence), suggesting a grazing eclipse.