CSS090530:144011+494734: a new SU UMa-type dwarf nova in Bootes

TL;DR

This paper reports the discovery and analysis of a new SU UMa-type dwarf nova in Bootes, detailing its superhump and orbital periods, brightness behavior, and outburst characteristics, contributing to the understanding of such variable stars.

Contribution

The study provides the first detailed photometric analysis of CSS090530:144011+494734, including superhump and orbital periods, and outburst properties, expanding knowledge of SU UMa-type dwarf novae.

Findings

Superhump period of 0.06500 days initially, changing to 0.06438 days.

Possible orbital period of 0.06322 days, with a superhump excess of 0.020.

Outburst amplitude of 5.5 magnitudes and a 5-day steady brightness phase.

Abstract

We report photometry and analysis of a previously unknown SU UMa-type dwarf nova in Bootes detected in outburst by the Catalina Real-time Transient Survey on 2009 May 30 with the discovery identifier CSS090530:144011+494734. This apparently stellar object had previously been catalogued by the Sloan Digital Sky survey as SDSS J144011.01+494733.4. We measured its mean superhump period over the first 3 days following detection as 0.06500(4) d at which point this changed to 0.06438(3) d. We detected a possible orbital period of 0.06322(8) d implying a mean superhump period excess of 0.020(2). After detection, the dwarf nova maintained steady brightness for 5 days before starting to fade. The outburst amplitude was 5.5 magnitudes above its quiescent level.