High-speed photometry of faint cataclysmic variables – VIII. Targets from the Catalina Real-Time Transient Survey

Abstract

Time series photometry of 20 Cataclysmic Variables detected by the Catalina Real-time Transient Survey is presented. 14 of these systems have not been observed previously and only two have been examined in-depth. From the observations we determined 12 new orbital periods and independently found a further two. Eight of the CVs are eclipsing systems, five of which have eclipse depths of more than 0.9 mag. Included in the sample are six SU UMa systems (three of which show superhumps in our photometry), a polar (SSS1944-42) and one system (CSS1417-18) that displays an abnormally fast decline from outburst.

Exploratory Spectroscopy of Magnetic Cataclysmic Variables Candidates and Other Variable Objects

“…They are broadly consistent with previous studies in the field (e.g., Szkody et al 2002Szkody et al , 2003Szkody et al , 2004Szkody et al , 2005Szkody et al , 2006Szkody et al , 2007Szkody et al , 2009Szkody et al , 2011Szkody et al , 2014Thorstensen & Skinner 2012;Thorstensen et al 2016;Breedt et al 2014;Woudt et al 2012;Coppejans et al 2014).…”

“…CRTS combines three distinct surveys -the Mount Lemmon Survey (MLS) and the Catalina Schmidt Survey (CSS) in the Northern Hemisphere and the Siding Spring Survey (SSS) in the South -covering an area of 30,000 deg 2 with a typical cadence of two weeks, reaching a depth of 19-21 magnitudes. The CRTS has already found thousands of CV candidates, which are rapidly announced via their website 1 and are subject to follow-up investigations (e.g., Coppejans et al 2014;Drake et al 2014;Breedt et al 2014; Thorstensen & Skinner 2012;Coppejans et al 2016). As the prime criterion for the CRTS detecting transients is the brightening by 2 or more magnitudes, it turns out to be very effective in discovering non-magnetic CVs, as the follow-up works mentioned above have shown.…”

1000 cataclysmic variables from the Catalina Real-time Transient Survey

“…Only 174 (17 per cent) of these CVs were known prior to the start of CRTS, 869 are new discoveries. The results from various follow-up programmes (Section 3 of this paper; Kato et al 2009Kato et al , 2010Kato et al , 2012Kato et al , 2013Thorstensen & Skinner 2012;Woudt et al 2012;Coppejans et al 2014) show that the identification process is highly accurate. Between 97 and 100 per cent of individual samples of CV candidates which were followed up were confirmed as CVs.…”

“…Three of these have already been confirmed as eclipsers: CRTS J043829.1+004016 was found to be a deeply eclipsing CV (∼1 mag) by Coppejans et al (2014), who measured an orbital period of 94.306 min. The same group also reported CRTS J082654.7−000733 and CRTS J140454.0−102702 to be eclipsing CVs, with orbital periods of 85.794 and 86.05 min, respectively (Woudt et al 2012).…”

“…Thorstensen & Skinner 2012;Woudt et al 2012;Coppejans et al 2014). The transient selection criteria, CV identification process, spatial distribution and photometric properties of the overall sample were presented by Drake et al (2014).…”