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PM J03338+3320: Long-period superhumps in growing phase following a separate precursor outburst
Kato, Taichi; de Miguel, Enrique; Stein, William; Maeda, Yutaka; Littlefield, Colin; Kiyota, Seiichiro; Vanmunster, Tonny; Dvorak, Shawn; Shugarov, Sergey Yu.; Kalinicheva, Eugenia S.; Pickard, Roger D.; Kasai, Kiyoshi; Cook, Lewis M.; Itoh, Hiroshi; Muyllaert, Eddy
AA(Department of Astronomy, Kyoto University, Kitashirakawa-oiwake-cho, Sakyo-ku, Kyoto, Kyoto 606-8502, Japan; Present address: National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588.), AB(Departamento de Física Aplicada, Facultad de Ciencias Experimentales, Universidad de Huelva, 21071 Huelva, Spain; Center for Backyard Astrophysics, Observatorio del CIECEM, Parque Dunar, Matalascañas, 21760 Almonte, Huelva, Spain), AC(Center for Backyard Astrophysics, 6025 Calle Paraiso, Las Cruces, NM 88012, USA), AD(Kaminishiyama-machi 12-14, Nagasaki, Nagasaki 850-0006, Japan), AE(Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, Indiana 46556, USA), AF(Variable Star Observers League in Japan (VSOLJ), 7-1 Kitahatsutomi, Kamagaya, Chiba 273-0126, Japan), AG(Center for Backyard Astrophysics Belgium, Walhostraat 1A, B-3401 Landen, Belgium), AH(Rolling Hills Observatory, 1643 Nightfall Drive, Clermont, FL 34711, USA), AI(Sternberg Astronomical Institute, Lomonosov Moscow State University, Universitetsky Ave., 13, Moscow 119992, Russia; Astronomical Institute of the Slovak Academy of Sciences, 05960 Tatranska Lomnica, Slovakia), AJ(Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory, Moscow, 119991, Russia), AK(The British Astronomical Association, Variable Star Section (BAA VSS), Burlington House, Piccadilly, London, W1J 0DU, UK; 3 The Birches, Shobdon, Leominster, Herefordshire, HR6 9NG, UK), AL(Baselstrasse 133D, CH-4132 Muttenz, Switzerland), AM(Center for Backyard Astrophysics Concord, 1730 Helix Ct. Concord, CA 94518, USA), AN(VSOLJ, 1001-105 Nishiterakata, Hachioji, Tokyo 192-0153, Japan), AO(Vereniging Voor Sterrenkunde (VVS), Moffelstraat 13 3370 Boutersem, Belgium)
Publications of the Astronomical Society of Japan, Volume 68, Issue 4, id.49 8 pp. (OUP Homepage)
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The Author 2016. Published by Oxford University Press on behalf of the Astronomical Society of Japan. All rights reserved.
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We observed the first-ever recorded outburst of PM J03338+3320, the cataclysmic variable selected by proper-motion survey. The outburst was composed of a precursor and the main superoutburst. The precursor outburst occurred at least 5 d before the maximum of the main superoutburst. Despite this separation, long-period superhumps were continuously seen between the precursor and main superoutburst. The period of these superhumps is longer than its orbital period by 6.0(1)% and can be interpreted to reflect the dynamical precession rate at the 3 : 1 resonance for a mass ratio of 0.172(4). These superhumps smoothly evolved into those in the main superoutburst. These observations provide the clearest evidence that the 3 : 1 resonance is triggered by the precursor outburst, even if it is well separated, and the resonance eventually causes the main superoutburst as predicted by the thermaltidal instability model. The presence of superhumps well before the superoutburst cannot be explained by alternative models (the enhanced mass-transfer model and the pure thermal instability one) and the present observations clearly support the thermaltidal instability model.
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