Extensive Photometry of V1838 Aql during the 2013 Superoutburst

Echevarría, J.; de Miguel, E.; Hernández Santisteban, J. V.; Michel, R.; Costero, R.; Sánchez, L. J.; Ruelas-Mayorga, A.; Olivares, J.; González-Buitrago, D.; Jones, J. L.; Oskanen, A.; Goff, W.; Ulowetz, J.; Bolt, G.; Sabo, R.; Hambsch, F.-J; Slauson, D.; Stein, W.
eprint arXiv:1810.09864


We present an in-depth photometric study of the 2013 superoutburst of the recently discovered cataclysmic variable V1838 Aql and subsequent photometry near its quiescent state. A careful examination of the development of the superhumps is presented. Our best determination of the orbital period is Porb = 0.05698(9) days, based on the periodicity of early superhumps. Comparing the superhump periods at stages A and B with the early superhump value we derive a period excess of {\epsilon} = 0.024(2) and a mass ratio of q = 0.10(1). We suggest that V1838 Aql is approaching the orbital period minimum and thus has a low-mass star as a donor instead of a sub-stellar object.