Related papers: WZ Sge-Type Dwarf Novae

Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae

We systematically surveyed period variations of superhumps in SU UMa-type dwarf novae based on newly obtained data and past publications. In many systems, the evolution of superhump period are found to be composed of three distinct stages:…

Solar and Stellar Astrophysics · Physics 2017-06-07 Taichi Kato , Akira Imada , Makoto Uemura , Daisaku Nogami , Hiroyuki Maehara , Ryoko Ishioka , Hajime Baba , Katsura Matsumoto , Hidetoshi Iwamatsu , Kaori Kubota , Kei Sugiyasu , Yuichi Soejima , Yuuki Moritani , Tomohito Ohshima , Hiroyuki Ohashi , Junpei Tanaka , Mahito Sasada , Akira Arai , Kazuhiro Nakajima , Seiichiro Kiyota , Kenji Tanabe , Kayuyoshi Imamura , Nanae Kunitomi , Kenji Kunihiro , Hiroki Taguchi , Mitsuo Koizumi , Norimi Yamada , Yuichi Nishi , Mayumi Kida , Sawa Tanaka , Rie Ueoka , Hideki Yasui , Koichi Maruoka , Arne Henden , Arto Oksanen , Marko Moilanen , Petri Tikkanen , Mika Aho , Berto Monard , Hiroshi Itoh , Pavol A. Dubovsky , Igor Kudzej , Radka Dancikova , Tonny Vanmunster , Jochen Pietz , Greg Bolt , David Boyd , Peter Nelson , Thomas Krajci , Lewis M. Cook , Ken'ichi Torii , Donn R. Starkey , Jeremy Shears , Lasse-Teist Jensen , Gianluca Masi , Rudolf Novak , Tomas Hynek , Radek Kocian , Lukas Kral , Hana Kucakova , Marek Kolasa , Petr Stastny , Bart Staels

WZ Sge-type dwarf novae with multiple rebrightenings: MASTER OT J211258.65+242145.4 and MASTER OT J203749.39+552210.3

We report on photometric observations of WZ Sge-type dwarf novae, MASTER OT J211258.65+242145.4 and MASTER OT J203749.39+552210.3 which underwent outbursts in 2012. Early superhumps were recorded in both systems. During superoutburst…

Solar and Stellar Astrophysics · Physics 2015-06-16 Chikako Nakata , Tomohito Ohshima , Taichi Kato , Daisaku Nogami , Gianluca Masi , Enrique de Miguel , Joseph Ulowetz , Colin Littlefield , William N. Goff , Thomas Krajci , Hiroyuki Maehara , William Stein , Richard Sabo , Ryo Noguchi , Rikako Ono , Miho Kawabata , Hisami Furukawa , Katsura Matsumoto , Takehiro Ishibashi , Pavol A. Dubovsky , Igor Kudzej , Shawn Dvorak , Franz-Josef Hambsch , Roger D. Pickard , Etienne Morelle , Eddy Muyllaert , Stefano Padovan , Arne Henden

ASASSN-16eg: New candidate of long-period WZ Sge-type dwarf nova

We report on our photometric observations of the 2016 superoutburst of ASASSN-16eg. This object showed a WZ Sge-type superoutburst with prominent early superhumps with a period of 0.075478(8) d and a post-superoutburst rebrightening. During…

Solar and Stellar Astrophysics · Physics 2017-09-25 Yasuyuki Wakamatsu , Keisuke Isogai , Mariko Kimura , Taichi Kato , Tonny Vanmunster , Geoff Stone , Tamás Tordai , Michael Richmond , Ian Miller , Arto Oksanen , Hiroshi Itoh , Hidehiko Akazawa , Seiichiro Kiyota , Enrique de Miguel , Elena P. Pavlenko , Kirill A. Antonyuk , Oksana I. Antonyuk , Vitaly V. Neustroev , George Sjoberg , Pavol A. Dubovsky , Roger D. Pickard , Daisaku Nogami

ASASSN-16dt and ASASSN-16hg: Promising Candidates for a Period Bouncer

We present optical photometry of superoutbursts in 2016 of two WZ Sge-type dwarf novae (DNe), ASASSN-16dt and ASASSN-16hg. Their light curves showed a dip in brightness between the first plateau stage with no ordinary superhumps (or early…

Solar and Stellar Astrophysics · Physics 2018-05-02 Mariko Kimura , Keisuke Isogai , Taichi Kato , Kenta Taguchi , Yasuyuki Wakamatsu , Franz-Josef Hambsch , Berto Monard , Gordon Myers , Shawn Dvorak , Peter Starr , Stephen M. Brincat , Enrique de Miguel , Joseph Ulowetz , Hiroshi Itoh , Geoff Stone , Daisaku Nogami

Late Superhumps in WZ Sge-Type Dwarf Novae

We report on the detection of very stable modulations with periods unexpectedly (~0.5%) longer than superhump periods during the slowly fading stage of WZ Sge-type superoutbursts in three systems, GW Lib, V455 And and WZ Sge. These periods…

Astrophysics · Physics 2015-05-13 Taichi Kato , Hiroyuki Maehara , Berto Monard

Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. VI: The Sixth Year (2013-2014)

Continuing the project described by Kato et al. (2009, PASJ, 61, S395, arXiv:0905.1757), we collected times of superhump maxima for 56 SU UMa-type dwarf novae mainly observed during the 2013-2014 season and characterized these objects. We…

Solar and Stellar Astrophysics · Physics 2015-06-22 Taichi Kato , Pavol A. Dubovsky , Igor Kudzej , Franz-Josef Hambsch , Ian Miller , Tomohito Ohshima , Chikako Nakata , Miho Kawabata , Hirochika Nishino , Kazunari Masumoto , Sahori Mizoguchi , Masayuki Yamanaka , Katsura Matsumoto , Daisuke Sakai , Daiki Fukushima , Minami Matsuura , Genki Bouno , Megumi Takenaka , Shinichi Nakagawa , Ryo Noguchi , Eriko Iino , Roger D. Pickard , Yutaka Maeda , Arne Henden , Kiyoshi Kasai , Seiichiro Kiyota , Hidehiko Akazawa , Kazuyoshi Imamura , Enrique de Miguel , Hiroyuki Maehara , Berto Monard , Elena P. Pavlenko , Kirill Antonyuk , Nikolaj Pit , Oksana I. Antonyuk , Aleksei V. Baklanov , Javier Ruiz , Michael Richmond , Arto Oksanen , Caisey Harlingten , Sergey Yu. Shugarov , Drahomir Chochol , Gianluca Masi , Francesca Nocentini , Patrick Schmeer , Greg Bolt , Peter Nelson , Joseph Ulowetz , Richard Sabo , William N. Goff , William Stein , Raul Michel , Shawn Dvorak , Irina B. Voloshina , Vladimir Metlov , Natalia Katysheva , Vitaly V. Neustroev , George Sjoberg , Colin Littlefield , Bartlomiej Debski , Paulina Sowicka , Marcin Klimaszewski , Malgorzata Curylo , Etienne Morelle , Ivan A. Curtis , Hidetoshi Iwamatsu , Neil D. Butterworth , Maksim V. Andreev , Nikolai Parakhin , Aleksandr Sklyanov , Kazuhiko Shiokawa , Rudolf Novak , Tat'yana R. Irsmambetova , Hiroshi Itoh , Yoshiharu Ito , Kenji Hirosawa , Denis Denisenko , Christopher S. Kochanek , Benjamin Shappee , Krzysztof Z. Stanek , Jose L. Prieto , Koh-ichi Itagaki , Rod Stubbings , Jose Ripero , Eddy Muyllaert , Gary Poyner

Photometric Analysis of TCP J20171288$+$1156589 -- WZ Sge Type Dwarf Nova with Delayed Ordinary Superhumps Emergence

We present the results of photometric analysis of WZ Sge type dwarf nova TCP J20171288$+$1156589. This object exhibited an outburst with a large amplitude of $>7.9$ magnitudes and was observed for over a month. The photometric evolution of…

Solar and Stellar Astrophysics · Physics 2026-02-24 Alexander Tarasenkov , Sergey Shugarov , Natalia Ikonnikova , Marina Burlak , Sergey Nazarov , Sjoerd Dufoer

Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. VIII: The Eighth Year (2015-2016)

Continuing the project described by Kato et al. (2009, arXiv:0905.1757), we collected times of superhump maxima for 128 SU UMa-type dwarf novae observed mainly during the 2015-2016 season and characterized these objects. The data have…

Solar and Stellar Astrophysics · Physics 2016-07-20 Taichi Kato , Franz-Josef Hambsch , Berto Monard , Tonny Vanmunster , Yutaka Maeda , Ian Miller , Hiroshi Itoh , Seiichiro Kiyota , Keisuke Isogai , Mariko Kimura , Akira Imada , Tamas Tordai , Hidehiko Akazawa , Kenji Tanabe , Noritoshi Otani , Minako Ogi , Kazuko Ando , Naoki Takigawa , Pavol A. Dubovsky , Igor Kudzej , Sergey Yu. Shugarov , Natalia Katysheva , Polina Golysheva , Natalia Gladilina , Drahomir Chochol , Peter Starr , Kiyoshi Kasai , Roger D. Pickard , Enrique de Miguel , Naoto Kojiguchi , Yuki Sugiura , Daiki Fukushima , Eiji Yamada , Yusuke Uto , Taku Kamibetsunawa , Taiki Tatsumi , Nao Takeda , Katsura Matsumoto , Lewis M. Cook , Elena P. Pavlenko , Julia V. Babina , Nikolaj V. Pit , Oksana I. Antonyuk , Kirill A. Antonyuk , Aleksei A. Sosnovskij , Aleksei V. Baklanov , Stella Kafka , William Stein , Irina B. Voloshina , Javier Ruiz , Richard Sabo , Shawn Dvorak , Geoff Stone , Maksim V. Andreev , Sergey V. Antipin , Alexandra M. Zubareva , Anna M. Zaostrojnykh , Michael Richmond , Jeremy Shears , Franky Dubois , Ludwig Logie , Steve Rau , Siegfried Vanaverbeke , Andrei Simon , Arto Oksanen , William N. Goff , Greg Bolt , Bartomiej Debski , Christopher S. Kochanek , Benjamin Shappee , Krzysztof Z. Stanek , Jose L. Prieto , Rod Stubbings , Eddy Muyllaert , Mitsutaka Hiraga , Tsuneo Horie , Patrick Schmeer , Kenji Hirosawa

Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. IX: The Ninth Year (2016-2017)

Continuing the project described by Kato et al. (2009, arXiv:0905.1757), we collected times of superhump maxima for 127 SU UMa-type dwarf novae observed mainly during the 2016--2017 season and characterized these objects. We provide updated…

Solar and Stellar Astrophysics · Physics 2017-10-11 Taichi Kato , Keisuke Isogai , Franz-Josef Hambsch , Tonny Vanmunster , Hiroshi Itoh , Berto Monard , Tamaas Tordai , Mariko Kimura , Yasuyuki Wakamatsu , Seiichiro Kiyota , Ian Miller , Peter Starr , Kiyoshi Kasai , Sergey Yu. Shugarov , Drahomir Chochol , Natalia Katysheva , Anna M. Zaostrojnykh , Matej Sekeras , Yuliana G. Kuznyetsova , Eugenia S. Kalinicheva , Polina Golysheva , Viktoriia Krushevska , Yutaka Maeda , Pavol A. Dubovsky , Igor Kudzej , Elena P. Pavlenko , Kirill A. Antonyuk , Nikolaj V. Pit , Aleksei A. Sosnovskij , Oksana I. Antonyuk , Aleksei V. Baklanov , Roger D. Pickard , Naoto Kojiguchi , Yuki Sugiura , Shihei Tei , Kenta Yamamura , Katsura Matsumoto , Javier Ruiz , Geoff Stone , Lewis M. Cook , Enrique de Miguel , Hidehiko Akazawa , William N. Goff , Etienne Morelle , Stella Kafka , Colin Littlefield , Greg Bolt , Franky Dubois , Stephen M. Brincat , Hiroyuki Maehara , Takeshi Sakanoi , Masato Kagitani , Akira Imada , Irina B. Voloshina , Maksim V. Andreev , Richard Sabo , Michael Richmond , Tony Rodda , Peter Nelson , Sergey Nazarov , Nikolay Mishevskiy , Gordon Myers , Denis Denisenko , Krzysztof Z. Stanek , Joseph V. Shields , Christopher S. Kochanek , Thomas W. -S. Holoien , Benjamin Shappee , Jose L. Prieto , Koh-ichi Itagaki , Koichi Nishiyama , Fujio Kabashima , Rod Stubbings , Patrick Schmeer , Eddy Muyllaert , Tsuneo Horie , Jeremy Shears , Gary Poyner , Masayuki Moriyama

Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. IV: The Fourth Year (2011-2012)

Continuing the project described by Kato et al. (2009, arXiv:0905.1757), we studied 86 SU UMa-type dwarf novae. We confirmed the general trends such as the relation between period derivatives and orbital periods. There are some systems…

Solar and Stellar Astrophysics · Physics 2015-06-11 Taichi Kato , Franz-Josef Hambsch , Hiroyuki Maehara , Gianluca Masi , Ian Miller , Ryo Noguchi , Chihiro Akasaka , Tomoya Aoki , Hiroshi Kobayashi , Katsura Matsumoto , Shinichi Nakagawa , Takuma Nakazato , Takashi Nomoto , Kazuyuki Ogura , Rikako Ono , Keisuke Taniuchi , William Stein , Arne Henden , Enrique de Miguel , Seiichiro Kiyota , Pavol A. Dubovsky , Igor Kudzej , Kazuyoshi Imamura , Hidehiko Akazawa , Ryosuke Takagi , Yuya Wakabayashi , Minako Ogi , Kenji Tanabe , Joseph Ulowetz , Etienne Morelle , Roger D. Pickard , Tomohito Ohshima , Kiyoshi Kasai , Elena P. Pavlenko , Oksana I. Antonyuk , Aleksei V. Baklanov , Kirill Antonyuk , Denis Samsonov , Nikolaj Pit , Aleksei Sosnovskij , Colin Littlefield , Richard Sabo , Javier Ruiz , Thomas Krajci , Shawn Dvorak , Arto Oksanen , Kenji Hirosawa , William N. Goff , Berto Monard , Jeremy Shears , David Boyd , Irina B. Voloshina , Sergey Yu. Shugarov , Drahomir Chochol , Atsushi Miyashita , Jochen Pietz , Natalia Katysheva , Hiroshi Itoh , Greg Bolt , Maksim V. Andreev , Nikolai Parakhin , Viktor Malanushenko , Fabio Martinelli , Denis Denisenko , Chris Stockdale , Peter Starr , Mike Simonsen , Paul. J. Tristram , Akihiko Fukui , Tamas Tordai , Robert Fidrich , Kevin B. Paxson , Koh-ichi Itagaki , Youichirou Nakashima , Seiichi Yoshida , Hideo Nishimura , Timur V. Kryachko , Andrey V. Samokhvalov , Stanislav A. Korotkiy , Boris L. Satovski , Rod Stubbings , Gary Poyner , Eddy Muyllaert , Vladimir Gerke , Walter MacDonald , Michael Linnolt , Yutaka Maeda , Hubert Hautecler

V1006 Cygni: Dwarf Nova Showing Three Types of Outbursts and Simulating Some Features of the WZ Sge-Type Behavior

We observed the 2015 July-August long outburst of V1006 Cyg and established this object to be an SU UMa-type dwarf nova in the period gap. Our observations have confirmed that V1006 Cyg is the second established object showing three types…

Solar and Stellar Astrophysics · Physics 2016-02-17 Taichi Kato , Elena P. Pavlenko , Alisa V. Shchurova , Aleksei A. Sosnovskij , Julia V. Babina , Aleksei V. Baklanov , Sergey Yu. Shugarov , Colin Littlefield , Pavol A. Dubovsky , Igor Kudzej , Roger D. Pickard , Keisuke Isogai , Mariko Kimura , Enrique de Miguel , Tamas Tordai , Drahomir Chochol , Yutaka Maeda , Lewis M. Cook , Ian Miller , Hiroshi Itoh

Unexpected Superoutburst and Rebrightening of AL Comae Berenices in 2015

In 2015 March, the notable WZ Sge-type dwarf nova AL Com exhibited an unusual outburst with a recurrence time of ${\sim}$1.5 yr, which is the shortest interval of superoutbursts among WZ Sge-type dwarf novae. Early superhumps in the…

Solar and Stellar Astrophysics · Physics 2016-02-17 Mariko Kimura , Taichi Kato , Akira Imada , Kai Ikuta , Keisuke Isogai , Pavol A. Dubovsky , Seiichiro Kiyota , Roger D. Pickard , Ian Miller , Elena P. Pavlenko , Aleksei A. Sosnovskij , Shawn Dvorak , Daisaku Nogami

TESS and ground-based observations of WZ Sge-type dwarf novae in outburst

Dwarf nova (DN) superoutbursts are accompanied by superhumps, which change their periods and profiles over a superoutburst. We present the TESS and ground-based observations of nine WZ Sge-type DNe and candidates in superoutburst. In TCP…

Solar and Stellar Astrophysics · Physics 2025-11-07 Y. Tampo , N. Kojiguchi , K. Isogai , D. Nogami , H. Itoh , F. -J. Hambsch , K. Matsumoto , R. Matsumura , D. Fujii , T. Tordai , Y. Sano , B. Monard , P. A. Dubovsky , T. Medulka , D. A. H. Buckley , N. Rawat , S. B. Potter , A. van Dyk , P. J. Groot , P. Woudt , S. Kiyota , G. Bolt , T. Vanmunster , J. Pietz , P. Starr , S. Y. Shugarov , K. Kasai , K. Menzies , S. M. Brincat , E. P. Pavlenko , A. Baklanov , J. Ito , T. Kato

New Method to Estimate Binary Mass Ratios by Using Superhumps

We propose a new dynamical method to estimate binary mass ratios by using the period of superhumps in SU UMa-type dwarf novae during the growing stage (the stage A superhumps). This method is based on a working hypothesis in which the…

Solar and Stellar Astrophysics · Physics 2015-06-16 Taichi Kato , Yoji Osaki

2021 superoutburst of WZ Sge-type dwarf nova V627 Pegasi lacks an early superhump phase

Superoutbursts in WZ Sge-type dwarf novae (DNe) are characterized by both early superhumps and ordinary superhumps originating from the 2:1 and 3:1 resonances, respectively. However, some WZ Sge-type DNe show a superoutburst lacking early…

Solar and Stellar Astrophysics · Physics 2023-04-26 Yusuke Tampo , Taichi Kato , Naoto Kojiguchi , Sergey Yu. Shugarov , Hiroshi Itoh , Katsura Matsumoto , Momoka Nakagawa , Yukitaka Nishida , Michael Richmond , Masaaki Shibata , Junpei Ito , Gulchehra Kokhirova , Firuza Rakhmatullaeva , Tamás Tordai , Seiichiro Kiyota , Javier Ruiz , Pavol A. Dubovsky , Tomáš Medulka , Elena P. Pavlenko , Oksana I. Antonyuk , Aleksei A. Sosnovskij , Aleksei V. Baklanov , Viktoriia Krushevska , Tonny Vanmunster , Stephen M. Brincat , Karol Petrik , Charles Galdies , Franz-Josef Hambsch , Yutaka Maeda , Daisaku Nogami

Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. VII: The Seventh Year (2014-2015)

Continuing the project described by Kato et al. (2009, arXiv:0905.1757), we collected times of superhump maxima for 102 SU UMa-type dwarf novae observed mainly during the 2014-2015 season and characterized these objects. Our project has…

Solar and Stellar Astrophysics · Physics 2015-10-21 Taichi Kato , Franz-Josef Hambsch , Pavol A. Dubovsky , Igor Kudzej , Berto Monard , Ian Miller , Hiroshi Itoh , Seiichiro Kiyota , Kazunari Masumoto , Daiki Fukushima , Hiroki Kinoshita , Kazuki Maeda , Jyunya Mikami , Risa Matsuda , Naoto Kojiguchi , Miho Kawabata , Megumi Takenaka , Katsura Matsumoto , Enrique de Miguel , Yutaka Maeda , Tomohito Ohshima , Keisuke Isogai , Roger D. Pickard , Arne Henden , Stella Kafka , Hidehiko Akazawa , Noritoshi Otani , Sakiko Ishibashi , Minako Ogi , Kenji Tanabe , Kazuyoshi Imamura , William Stein , Kiyoshi Kasai , Tonny Vanmunster , Peter Starr , Elena P. Pavlenko , Oksana I. Antonyuk , Kirill A. Antonyuk , Aleksei A. Sosnovskij , Nikolaj V. Pit , Julia V. Babina , Aleksandr Sklyanov , Rudolf Novak , Arto Oksanen , Shawn Dvorak , Raul Michel , Gianluca Masi , Colin Littlefield , Joseph Ulowetz , Sergey Yu. Shugarov , Polina Yu. Golysheva , Drahomir Chochol , Viktoriia Krushevska , Javier Ruiz , Tamas Tordai , Etienne Morelle , Richard Sabo , Hiroyuki Maehara , Michael Richmond , Natalia Katysheva , Kenji Hirosawa , William N. Goff , Franky Dubois , Ludwig Logie , Steve Rau , Irina B. Voloshina , Maksim V. Andreev , Kazuhiko Shiokawa , Vitaly V. Neustroev , George Sjoberg , Sergey Zharikov , Nick James , Greg Bolt , Tim Crawford , Denis Buczynski , Lewis M. Cook , Christopher S. Kochanek , Benjamin Shappee , Krzysztof Z. Stanek , Jose L. Prieto , Denis Denisenko , Hideo Nishimura , Masaru Mukai , Shizuo Kaneko , Seiji Ueda , Rod Stubbings , Masayuki Moriyama , Patrick Schmeer , Eddy Muyllaert , Jeremy Shears , Robert J. Modic , Kevin B. Paxson

Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. V: The Fifth Year (2012-2013)

Continuing the project described by Kato et al. (2009a, arXiv:0905.1757), we collected times of superhump maxima for SU UMa-type dwarf novae mainly observed during the 2012-2013 season. We found three objects (V444 Peg, CSS J203937 and…

Solar and Stellar Astrophysics · Physics 2016-04-20 Taichi Kato , Franz-Josef Hambsch , Hiroyuki Maehara , Gianluca Masi , Francesca Nocentini , Pavol A. Dubovsky , Igor Kudzej , Kazuyoshi Imamura , Minako Ogi , Kenji Tanabe , Hidehiko Akazawa , Thomas Krajci , Ian Miller , Enrique de Miguel , Arne Henden , Colin Littlefield , Ryo Noguchi , Takehiro Ishibashi , Rikako Ono , Miho Kawabata , Hiroshi Kobayashi , Daisuke Sakai , Hirochika Nishino , Hisami Furukawa , Kazunari Masumoto , Katsura Matsumoto , Tomohito Ohshima , Chikako Nakata , Satoshi Honda , Kenzo Kinugasa , Osamu Hashimoto , William Stein , Roger D. Pickard , Seiichiro Kiyota , Elena P. Pavlenko , Oksana I. Antonyuk , Aleksei V. Baklanov , Kirill Antonyuk , Denis Samsonov , Nikolaj Pit , Aleksei Sosnovskij , Arto Oksanen , Caisey Harlingten , Jenni Tyyska , Berto Monard , Sergey Yu. Shugarov , Drahomir Chochol , Kiyoshi Kasai , Yutaka Maeda , Kenji Hirosawa , Hiroshi Itoh , Richard Sabo , Joseph Ulowetz , Etienne Morelle , Raul Michel , Genaro Suarez , Nick James , Shawn Dvorak , Irina B. Voloshina , Michael Richmond , Bart Staels , David Boyd , Maksim V. Andreev , Nikolai Parakhin , Natalia Katysheva , Atsushi Miyashita , Kazuhiro Nakajima , Greg Bolt , Stefano Padovan , Peter Nelson , Donn R. Starkey , Denis Buczynski , Peter Starr , William N. Goff , Denis Denisenko , Christopher S. Kochanek , Benjamin Shappee , Krzysztof Z. Stanek , Jose L. Prieto , Koh-ichi Itagaki , Shizuo Kaneko , Rod Stubbings , Eddy Muyllaert , Jeremy Shears , Patrick Schmeer , Gary Poyner , Miguel Rodriguez Marco

First detection of the growing humps at the rapidly rising stage of dwarf novae AL Com and WZ Sge

We report on time-series photometric observations in the earliest stages of superoutbursts of the extreme dwarf novae, AL Com and WZ Sge, which started on 2001 May after the 6 years quiescence and on 2001 July after the 23 years quiescence,…

Astrophysics · Physics 2009-11-07 Ryoko Ishioka , Makoto Uemura , Katsura Matsumoto , Hiroyuki Ohashi , Taichi Kato , Gianluca Masi , Rudolf Novak , Jochen Pietz , Brian Martin , Donn Starkey , Seiichiro Kiyota , Arto Oksanen , Marko Moilanen , Lew Cook

Photometric Studies of a WZ Sge-Type Dwarf Nova Candidate, ASAS160048-4846.2

We report on our time-resolved CCD photometry during the 2005 June superoutburst of a WZ Sge-type dwarf nova candidate, ASAS 160048-4846.2. The ordinary superhumps underwent a complex evolution during the superoutburst. The superhump…

Astrophysics · Physics 2015-05-13 Yuichi Soejima , Akira Imada , Daisaku Nogami , Taichi Kato , L. A. G. Berto Monard

PNV J00444033+4113068: early superhumps with 0.7 mag amplitude and non-red color

In the first days of WZ Sge-type dwarf nova (DN) outbursts, the 2:1 resonance induces a spiral arm structure in the accretion disk, which is observed as early superhumps in optical light curves. This paper reports our optical observations…

Solar and Stellar Astrophysics · Physics 2022-09-28 Yusuke Tampo , Keisuke Isogai , Naoto Kojiguchi , Makoto Uemura , Taichi Kato , Tamás Tordai , Tonny Vanmunster , Hiroshi Itoh , Pavol A. Dubovsky , Tomáš Medulka , Yasuo Sano , Franz-josef Hambsch , Kenta Taguchi , Hiroyuki Maehara , Junpei Ito , Daisaku Nogam