Hunting for eclipses: high-speed observations of cataclysmic variables

Abstract

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High-speed photometry of faint cataclysmic variables – IX. Targets from multiple transient surveys

“…5)3.6 CSS 0524+00 (CSS131106:052412+004148)Since the discovery of CSS 0524+00 by CRTS on 2013 Nov 6(Drake et al 2009), ample coverage shows evidence of multiple eclipses and outbursts. With evidence of eclipses,Hardy et al (2017) observed CSS 0524+00, finding a period of 0.17466647(±2) d. We find a period of 0.1747(±3) d, in agreement with that found byHardy et al (2017). Our average light curve, folded on the ephemeris HJD min = 2456651.4295(±3) + 0.1747(±3) E, is shown inFigure 1; and shows eclipse depths of around 1.2 mag.…”

“…The CRTS light curve shows evidence of previous outbursts, as well as a possible superoutburst. Hardy et al (2017) observed CSS 2144+22, confirming no eclipses. Our average light curve is shown in Figure 6.…”

“…Systems with clearly defined eclipse components (bright spot, accretion disc, white dwarf and donor star) can be modelled to accurately determine the systems parameters, such as masses and radii of the stellar components. This information contributes towards completing the sample distribution of CV parameters (such as orbital period distribution or white dwarf mass distribution) and plays an important role in understanding their evolution (Hardy et al 2017). ASASSN-14ik and ASASSN-14ka have outburst periods of ∼ 1 month, while ASASSN-14hv has outbursts approximately every 2 months, along with superoutbursts,.…”

“…Oliveira et al (2017) later obtained a spectrum of MLS 0720+17. They concluded that the spectrum was typical of a polar, with the eclipse seen by Hardy et al (2017) being a modulation due to cyclotron emission, and the narrow emission lines seen in the spectrum inconsistent with an eclipsing disc system. Our individual light curves and time-resolved spectroscopy are shown in Figure 4 and Figure 5 respectively, while our average light curve is shown in Figure 1.…”

High-speed photometry of Gaia14aae: an eclipsing AM CVn that challenges formation models

“…Data were also collected using ULTRASPEC (Dhillon et al 2014), a single-band photometer with a frame-transfer, electron-multiplying CCD and only 15 ms dead time per cycle, which is mounted on the 2.4 m Thai National Telescope (TNT). Most of the ULTRA-SPEC data were taken using a custom filter, KG5 , which has a broader band to allow for shorter exposure times given the smaller collecting area of this telescope (for more details on the KG5 band, see Hardy et al 2017). A further series of eclipses were observed using CHIMERA (Harding et al 2016), a 2-band photometer which uses frame-transfer, electron-multiplying CCDs to achieve 15 ms dead time, and is mounted on the Hale 200-inch (5.1 m) Telescope.…”