Eclipsing, short-period post-common envelope binaries (PCEBs) have been studied for several decades by eclipse timing variations (ETVs) which have been interpreted as being caused by circumbinary bodies. In this paper we report 355 new observations of 7 PECBs (HS0705+6700, NN Ser, NSVS 07826147, NSVS 14256825, NY Vir, QS Vir and RR Cae) and examine how the recent proposed models of these systems compare with our new observations. We find that none of the 18 recent models fit accurately with our data. We review alternative mechanisms of the ETVs, including magnetic effects, but conclude that they do not predict our results. Although we cannot exclude the presence of circumbinary bodies a combination of several mechanisms may be required to explain the observed ETVs.
@article{arxiv.2507.06748,
title = {Eclipse timing variations in 7 post-common envelope binaries: an update on recent circumbinary models},
author = {D. Pulley and I. D. Sharp and J. Mallett and S. von Harrach},
journal= {arXiv preprint arXiv:2507.06748},
year = {2025}
}
Comments
14 pages, 17 figures and 5 tables. Observational data in separate file