Mexicana de Astronomía y Astrofísica ( 2007 ) EXTENSIVE PHOTOMETRY OF V 1838 AQL DURING THE 2013 SUPEROUTBURST

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 1Instituto de Astronomía, Universidad Nacional Autónoma de México, Apartado Postal 70-264, Ciudad Universitaria, México D.F., C.P. 04510, México 2Departamento de Ciencias Integradas, Universidad de Huelva, E–21071 Huelva, Spain 3Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098XH Amsterdam, the Netherlands 4Instituto de Astronomía, Universidad Nacional Autónoma de México, Apartado Postal 877, Ensenada, Baja California, C.P. 22830 México 5Laboratoire d’Astrophysique de Bordeaux, Univ. Bordeaux, CNRS, B18N, allée Geoffroy Saint-Hilaire, 33615 Pessac, France 6Departament of Physics and Astronomy 4129, Frederick Reines Hall, University of California, Irvine, CA, 92697-4575 7CBA–Oregon, Jack Jones Observatory, 22665 Bents Road NE, Aurora, OR, USA 8CBA–Finland, Hankasalmi Observatory, Verkkoniementie 30, FI–40950 Muurame, Finland 9CBA–California, 13508 Monitor Lane, Sutter Creek, CA 95685, USA 10CBA–Illinois, Northbrook Meadow Observatory, 855 Fair Lane, Northbrook, IL 60062, USA 11CBA–Australia, 295 Camberwarra Drive, Craigie, Western Australia 6025 12CBA–Montana, 2336 Tailcrest Dr., Bozeman, MT 59718, USA 13CBA–Mol, Andromeda Observatory, Oude Bleken 12, B–2400 Mol, Belgium 14CBA–Iowa, Owl Ridge Observatory, 73 Summit Avenue NE, Swisher, IA 52338, USA 15CBA–Las Cruces, 6025 Calle Paraiso, Las Cruces, NM 88012, USA 1 ar X iv :1 81 0. 09 86 4v 2 [ as tr oph .S R ] 6 N ov 2 01 8 2 J. ECHEVARRÍA ET AL. value we derive a period excess of = 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.