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Discovery of a New Dwarf Nova, TSS J022216.4+412259.9: a WZ Sge-type Dwarf Nova Breaking the Shortest Superhump Period Record

Published online by Cambridge University Press:  09 August 2007

Akira Imada
Affiliation:
Department of Astronomy, Faculty of Science, Sakyo-ku, Kyoto, Japan email: a_imada@kusastro.kyoto-u.ac.jp
Kaori Kubota
Affiliation:
Department of Astronomy, Faculty of Science, Sakyo-ku, Kyoto, Japan email: a_imada@kusastro.kyoto-u.ac.jp
Taichi Kato
Affiliation:
Department of Astronomy, Faculty of Science, Sakyo-ku, Kyoto, Japan email: a_imada@kusastro.kyoto-u.ac.jp
Daisaku Nogami
Affiliation:
Department of Astronomy, Faculty of Science, Sakyo-ku, Kyoto, Japan email: a_imada@kusastro.kyoto-u.ac.jp
Hiroyuki Maehara
Affiliation:
Department of Astronomy, Faculty of Science, Sakyo-ku, Kyoto, Japan email: a_imada@kusastro.kyoto-u.ac.jp
Kazuhiro Nakajima
Affiliation:
Department of Astronomy, Faculty of Science, Sakyo-ku, Kyoto, Japan email: a_imada@kusastro.kyoto-u.ac.jp
Makoto Uemura
Affiliation:
Department of Astronomy, Faculty of Science, Sakyo-ku, Kyoto, Japan email: a_imada@kusastro.kyoto-u.ac.jp
Ryoko Ishioka
Affiliation:
Department of Astronomy, Faculty of Science, Sakyo-ku, Kyoto, Japan email: a_imada@kusastro.kyoto-u.ac.jp
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Abstract

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We report on time-resolved CCD photometry of the newly-discovered dwarf nova, TSS J022216.4+412259.9 during its outburst in 2005 November–December. The best-estimated superhump period was 0.0554 days, which is the shortest superhump period among WZ Sge-type dwarf novae ever known. Double-peaked humps were also detected with a period of 0.05487 days in the early stage of the outburst. A rebrightening exhibited after the end of the plateau phase. All of these observations indicate the WZ Sge nature of the system. We mainly discuss the rebrightening stage of the superoutburst, compared with other WZ Sge-type dwarf novae.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2007

References

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