Photometry of the eclipsing cataclysmic variable SDSS J152419.33+220920.0

TL;DR

This study provides detailed photometric analysis of the faint cataclysmic variable SDSS J152419.33+220920.0, revealing its orbital characteristics, primary and secondary modulations, and an accurate ephemeris based on six nights of observations.

Contribution

The paper offers the first detailed light curve analysis and precise ephemeris for SDSS J152419.33+220920.0, clarifying its modulation features and orbital period.

Findings

Detected primary and secondary modulations in the light curve.

Determined the system's accurate ephemeris.

Identified a double-hump orbital modulation at several epochs.

Abstract

Aims. We present new photometry of the faint and poorly studied cataclysmic variable SDSS J152419.33+220920.0, analyze its light curve and provide an accurate ephemeris for this system. Methods. Time-resolved CCD differential photometry was carried out using the 1.5m and 0.84m telescopes at the Observatorio Astronomico Nacional at San Pedro Martir. Results. From time-resolved photometry of the system obtained during six nights (covering more than twenty primary eclipse cycles in more than three years), we show that this binary presents a strong primary and a weak secondary modulation. Our light curve analysis shows that only two fundamental frequencies are present, corresponding to the orbital period and a modulation with twice this frequency. We determine the accurate ephemeris of the system to be HJD(eclipse)= 2454967.6750(1) + 0.06531866661(1) E. A double-hump orbital period modulation, a standing feature in several bounce-back systems at quiescence, is present at several epochs. However, we found no other evidence to support the hypothesis that this system belongs to the post-minimum orbital-period systems.