{"paper":{"title":"Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. II: The Second Year (2009-2010)","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Akira Imada, Arne Henden, Arto Oksanen, Atsushi Miyashita, Bart Staels, Berto Monard, Chris Stockdale, Daichi Fujii, Daisaku Nogami, David Boyd, Eddy Muyllaert, Elena P. Pavlenko, Enrique de Miguel, Eriko Iino, Etienne Morelle, Franz-Josef Hambsch, Frederick A. Ringwald, Gianluca Masi, Greg Bolt, Hidehiko Akazawa, Hirofumi Yanagisawa, Hiroshi Itoh, Hiroshi Kobayashi, Hiroyuki Maehara, Ian Miller, Igor Kudzej, Irina B. Voloshina, Javier Ruiz, Jeremy Shears, Katsura Matsumoto, Kazuyoshi Imamura, Kazuyuki Ogura, Kenji Tanabe, Kousei Yamashita, Makoto Uemura, Michael Richmond, Mike Simonsen, Mikiha Nose, Nanae Kunitomi, Pavol A. Dubovsky, Peter Nelson, Rod Stubbings, Roger D. Pickard, Rudolf Novak, Ryoko Ishioka, Ryo Noguchi, Ryosuke Takagi, Sachi Ohtomo, Seiichiro Kiyota, Shawn Dvorak, Shinichi Nakagawa, Steve Brady, Taichi Kato, Tetsuya Kuramoto, Thomas Krajci, Tim Crawford, Tomas Hynek, Tomas L. Gomez, Tomohito Ohshima","submitted_at":"2010-09-28T04:53:49Z","abstract_excerpt":"As an extension of the project in Kato et al. (2009, arXiv:0905.1757), we collected times of superhump maxima for 61 SU UMa-type dwarf novae mainly observed during the 2009-2010 season. The newly obtained data confirmed the basic findings reported in Kato et al. (2009): the presence of stages A-C, as well as the predominance of positive period derivatives during stage B in systems with superhump periods shorter than 0.07 d. There was a systematic difference in period derivatives for systems with superhump periods longer than 0.075 d between this study and Kato et al. (2009). We suggest that th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1009.5444","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}