Search Results - "Imada, Akira"

Repetitive patterns in rapid optical variations in the nearby black-hole binary V404 Cygni by Kimura, Mariko, Isogai, Keisuke, Kato, Taichi, Ueda, Yoshihiro, Nakahira, Satoshi, Shidatsu, Megumi, Enoto, Teruaki, Hori, Takafumi, Nogami, Daisaku, Littlefield, Colin, Ishioka, Ryoko, Chen, Ying-Tung, King, Sun-Kun, Wen, Chih-Yi, Wang, Shiang-Yu, Lehner, Matthew J., Schwamb, Megan E., Wang, Jen-Hung, Zhang, Zhi-Wei, Alcock, Charles, Axelrod, Tim, Bianco, Federica B., Byun, Yong-Ik, Chen, Wen-Ping, Cook, Kem H., Kim, Dae-Won, Lee, Typhoon, Marshall, Stuart L., Pavlenko, Elena P., Antonyuk, Oksana I., Antonyuk, Kirill A., Pit, Nikolai V., Sosnovskij, Aleksei A., Babina, Julia V., Baklanov, Aleksei V., Pozanenko, Alexei S., Mazaeva, Elena D., Schmalz, Sergei E., Reva, Inna V., Belan, Sergei P., Inasaridze, Raguli Ya, Tungalag, Namkhai, Volnova, Alina A., Molotov, Igor E., Miguel, Enrique de, Kasai, Kiyoshi, Stein, William L., Dubovsky, Pavol A., Kiyota, Seiichiro, Miller, Ian, Richmond, Michael, Goff, William, Andreev, Maksim V., Takahashi, Hiromitsu, Kojiguchi, Naoto, Sugiura, Yuki, Takeda, Nao, Yamada, Eiji, Matsumoto, Katsura, James, Nick, Pickard, Roger D., Tordai, Tamás, Maeda, Yutaka, Ruiz, Javier, Miyashita, Atsushi, Cook, Lewis M., Imada, Akira, Uemura, Makoto

“…How black holes accrete surrounding matter is a fundamental yet unsolved question in astrophysics. It is generally believed that matter is absorbed into black…”
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OAO/MITSuME photometry of dwarf novae. III. CSS130418:174033+414756 by Imada, Akira, Isogai, Keisuke, Yanagisawa, Kenshi, Kawai, Nobuyuki

“…Abstract We report on multicolor photometry of the short-period dwarf nova CSS130418:174033+414756 during the 2013 superoutburst. The system showed an…”
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Spectroscopic observations of V455 Andromedae superoutburst in 2007: The most exotic spectral features in dwarf nova outbursts by Tampo, Yusuke, Nogami, Daisaku, Kato, Taichi, Ayani, Kazuya, Naito, Hiroyuki, Narita, Norio, Fujii, Mitsugu, Hashimoto, Osamu, Kinugasa, Kenzo, Honda, Satoshi, Takahashi, Hidenori, Narusawa, Shin-ya, Sakamoto, Makoto, Imada, Akira

“…Abstract We present our spectroscopic observations of V455 Andromedae during the 2007 superoutburst. Our observations cover this superoutburst from around the…”
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OAO/MITSuME photometry of dwarf novae. II. HV Virginis and OT J012059.6+325545 by Imada, Akira, Isogai, Keisuke, raki, Takahiro, Tanada, Shunsuke, Yanagisawa, Kenshi, Kawai, Nobuyuki

“…Abstract We report on multicolor photometry of WZ Sge-type dwarf novae HV Vir and OT J012059.6+325545 during superoutbursts. These systems show early…”
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Survey of period variations of superhumps in SU UMa-type dwarf novae. IX. The ninth year (2016–2017) by Kato, Taichi, Isogai, Keisuke, Hambsch, Franz-Josef, Vanmunster, Tonny, Itoh, Hiroshi, Monard, Berto, Tordai, Tamás, Kimura, Mariko, Wakamatsu, Yasuyuki, Kiyota, Seiichiro, Miller, Ian, Starr, Peter, Kasai, Kiyoshi, Shugarov, Sergey Yu, Chochol, Drahomir, Katysheva, Natalia, Zaostrojnykh, Anna M., Sekeráš, Matej, Kuznyetsova, Yuliana G., Kalinicheva, Eugenia S., Golysheva, Polina, Krushevska, Viktoriia, Maeda, Yutaka, Dubovsky, Pavol A., Kudzej, Igor, Pavlenko, Elena P., Antonyuk, Kirill A., Pit, Nikolaj V., Sosnovskij, Aleksei A., Antonyuk, Oksana I., Baklanov, Aleksei V., Pickard, Roger D., Kojiguchi, Naoto, Sugiura, Yuki, Tei, Shihei, Yamamura, Kenta, Matsumoto, Katsura, Ruiz, Javier, Stone, Geoff, Cook, Lewis M., de Miguel, Enrique, Akazawa, Hidehiko, Goff, William N., Morelle, Etienne, Kafka, Stella, Littlefield, Colin, Bolt, Greg, Dubois, Franky, Brincat, Stephen M., Maehara, Hiroyuki, Sakanoi, Takeshi, Kagitani, Masato, Imada, Akira, Voloshina, Irina B., Andreev, Maksim V., Sabo, Richard, Richmond, Michael, Rodda, Tony, Nelson, Peter, Nazarov, Sergey, Mishevskiy, Nikolay, Myers, Gordon, Denisenko, Denis, Stanek, Krzysztof Z., Shields, Joseph V., Kochanek, Christopher S., Holoien, Thomas W.-S., Shappee, Benjamin, Prieto, José L., Itagaki, Koh-ichi, Nishiyama, Koichi, Kabashima, Fujio, Stubbings, Rod, Schmeer, Patrick, Muyllaert, Eddy, Horie, Tsuneo, Shears, Jeremy, Poyner, Gary, Moriyama, Masayuki

“…Abstract Continuing the project described by Kato et al. (2009, PASJ, 61, S395), we collected times of superhump maxima for 127 SU UMa-type dwarf novae…”
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Survey of period variations of superhumps in SU UMa-type dwarf novae. VIII. The eighth year (2015–2016) by Kato, Taichi, Hambsch, Franz-Josef, Monard, Berto, Vanmunster, Tonny, Maeda, Yutaka, Miller, Ian, Itoh, Hiroshi, Kiyota, Seiichiro, Isogai, Keisuke, Kimura, Mariko, Imada, Akira, Tordai, Tamás, Akazawa, Hidehiko, Tanabe, Kenji, Otani, Noritoshi, Ogi, Minako, Ando, Kazuko, Takigawa, Naoki, Dubovsky, Pavol A., Kudzej, Igor, Shugarov, Sergey Yu, Katysheva, Natalia, Golysheva, Polina, Gladilina, Natalia, Chochol, Drahomir, Starr, Peter, Kasai, Kiyoshi, Pickard, Roger D., Miguel, Enrique de, Kojiguchi, Naoto, Sugiura, Yuki, Fukushima, Daiki, Yamada, Eiji, Uto, Yusuke, Kamibetsunawa, Taku, Tatsumi, Taiki, Takeda, Nao, Matsumoto, Katsura, Cook, Lewis M., Pavlenko, Elena P., Babina, Julia V., Pit, Nikolaj V., Antonyuk, Oksana I., Antonyuk, Kirill A., Sosnovskij, Aleksei A., Baklanov, Aleksei V., Kafka, Stella, Stein, William, Voloshina, Irina B., Ruiz, Javier, Sabo, Richard, Dvorak, Shawn, Stone, Geoff, Andreev, Maksim V., Antipin, Sergey V., Zubareva, Alexandra M., Zaostrojnykh, Anna M., Richmond, Michael, Shears, Jeremy, Dubois, Franky, Logie, Ludwig, Rau, Steve, Vanaverbeke, Siegfried, Simon, Andrei, Oksanen, Arto, Goff, William N., Bolt, Greg, Dębski, Bartłomiej, Kochanek, Christopher S., Shappee, Benjamin, Stanek, Krzysztof Z., Prieto, José L., Stubbings, Rod, Muyllaert, Eddy, Hiraga, Mitsutaka, Horie, Tsuneo, Schmeer, Patrick, Hirosawa, Kenji

“…Continuing the project described by Kato et al. (2009, PASJ, 61, S395), we collected times of superhump maxima for 128 SU UMa-type dwarf novae observed mainly…”
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Third-nearest WZ Sge-Type dwarf nova candidate ASASSN-14dx classified on the basis of Gaia Data Release 2 by Isogai, Keisuke, Kato, Taichi, Imada, Akira, Ohshima, Tomohito, Kojiguchi, Naoto, Ohnishi, Ryuhei, Hambsch, Franz-Josef, Monard, Berto, Kiyota, Seiichiro, Nishimura, Hideo, Nogami, Daisaku

“…Abstract ASASSN-14dx showed an extraordinary outburst whose features are a small outburst amplitude (∼2.3 mag) and long duration (>4 yr). Because we found a…”
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Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. II The Second Year (2009–2010) by Kato, Taichi, Maehara, Hiroyuki, Uemura, Makoto, Henden, Arne, De Miguel, Enrique, Miller, Ian, Dubovsky, Pavol A., Kudzej, Igor, Kiyota, Seiichiro, Hambsch, Franz-Josef, Tanabe, Kenji, Imamura, Kazuyoshi, Kunitomi, Nanae, Takagi, Ryosuke, Nose, Mikiha, Akazawa, Hidehiko, Masi, Gianluca, Nakagawa, Shinichi, Iino, Eriko, Noguchi, Ryo, Matsumoto, Katsura, Fujii, Daichi, Kobayashi, Hiroshi, Ogura, Kazuyuki, Ohtomo, Sachi, Yamashita, Kousei, Yanagisawa, Hirofumi, Itoh, Hiroshi, Bolt, Greg, Monard, Berto, Ohshima, Tomohito, Shears, Jeremy, Ruiz, Javier, Imada, Akira, Oksanen, Arto, Nelson, Peter, Gomez, Tomas L., Staels, Bart, Boyd, David, Voloshina, Irina B., Krajci, Thomas, Crawford, Tim, Stockdale, Chris, Richmond, Michael, Morelle, Etienne, NovÁk, Rudolf, Nogami, Daisaku, Ishioka, Ryoko, Brady, Steve, Simonsen, Mike, Pavlenko, Elena P., Ringwald, Frederick A., Kuramoto, Tetsuya, Miyashita, Atsushi, Pickard, Roger D., Hynek, Tomáš, Dvorak, Shawn, Stubbings, Rod, Muyllaert, Eddy

“…Continued from Kato et al. (2009, PASJ, 61, S395), we collected the times of superhump maxima for 68 SU UMa-type dwarf novae, mainly observed during the…”
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RZ Leonis Minoris bridging between ER Ursae Majoris-type dwarf nova and nova-like system by Kato, Taichi, Ishioka, Ryoko, Isogai, Keisuke, Kimura, Mariko, Imada, Akira, Miller, Ian, Masumoto, Kazunari, Nishino, Hirochika, Kojiguchi, Naoto, Kawabata, Miho, Sakai, Daisuke, Sugiura, Yuki, Furukawa, Hisami, Yamamura, Kenta, Kobayashi, Hiroshi, Matsumoto, Katsura, Wang, Shiang-Yu, Chou, Yi, Ngeow, Chow-Choong, Chen, Wen-Ping, Panwar, Neelam, Lin, Chi-Sheng, Hsiao, Hsiang-Yao, Guo, Jhen-Kuei, Lin, Chien-Cheng, Omarov, Chingis, Kusakin, Anatoly, Krugov, Maxim, Starkey, Donn R., Pavlenko, Elena P., Antonyuk, Kirill A., Sosnjvskij, Aleksei A., Antonyuk, Oksana I., Pit, Nikolai V., Baklanov, Alex V., Babina, Julia V., Itoh, Hiroshi, Padovan, Stefano, Akazawa, Hidehiko, Kafka, Stella, de Miguel, Enrique, Pickard, Roger D., Kiyota, Seiichiro, Shugarov, Sergey Yu, Chochol, Drahomir, Krushevska, Viktoriia, Sekeráš, Matej, Pikalova, Olga, Sabo, Richard, Dubovsky, Pavol A., Kudzej, Igor, Ulowetz, Joseph, Dvorak, Shawn, Stone, Geoff, Tordai, Tamás, Dubois, Franky, Logie, Ludwig, Rau, Steve, Vanaverbeke, Siegfried, Vanmunster, Tonny, Oksanen, Arto, Maeda, Yutaka, Kasai, Kiyoshi, Katysheva, Natalia, Morelle, Etienne, Neustroev, Vitaly V., Sjoberg, George

“…Abstract We observed RZ LMi, which is renowned for its extremely short (∼19 d) supercycle and is a member of a small, unusual class of cataclysmic variables…”
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The 2015 superoutburst of QZ Virginis: Detection of growing superhumps between the precursor and main superoutburst by Imada, Akira, Kato, Taichi, Isogai, Keisuke, Hambsch, Franz-Josef, Dubovsky, Pavol A., Kudzej, Igor, Pickard, Roger D., Akazawa, Hidehiko, Kasai, Kiyoshi, Itoh, Hiroshi, Cook, Lewis M., Kiyota, Seiichiro

“…Abstract We report on time-resolved photometry of the 2015 February–March superoutburst of QZ Virginis. The superoutburst consisted of a separated precursor,…”
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Unexpected superoutburst and rebrightening of AL Comae Berenices in 2015 by Kimura, Mariko, Kato, Taichi, Imada, Akira, Ikuta, Kai, Isogai, Keisuke, Dubovsky, Pavol A., Kiyota, Seiichiro, Pickard, Roger D., Miller, Ian, Pavlenko, Elena P., Sosnovskij, Aleksei A., Dvorak, Shawn, Nogami, Daisaku

“…In 2015 March, the notable WZ Sge-type dwarf nova AL Com exhibited an unusual outburst with a recurrence time of ∼ 1.5 yr, which is the shortest interval of…”
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Photometric Studies of a WZ Sge-Type Dwarf Nova Candidate, ASAS 160048 $-$ 4846.2 by Soejima, Yuichi, Imada, Akira, Nogami, Daisaku, Kato, Taichi, Monard, Berto

“…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…”
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Discovery of Superhumps during a Normal Outburst of SU Ursae Majoris by Imada, Akira, Izumiura, Hideyuki, Kuroda, Daisuke, Yanagisawa, Kenshi, Kawai, Nobuyuki, Omodaka, Toshihiro, Miyanoshita, Ryo

“…We report on time-resolved photometry during a 2012 January normal outburst of SU UMa. The light curve shows hump-like modulations with a period of 0.07903(11)…”
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OAO/MITSuME Photometry of Dwarf Novae. I. SU Ursae Majoris by Imada, Akira, Izumiura, Hideyuki, Kuroda, Daisuke, Yanagisawa, Kenshi, Omodaka, Toshihiro, Miyanoshita, Ryo, Kawai, Nobuyuki, Nogami, Daisaku

“…We report on simultaneous $g', R_{\rm c}$ , and $I_{\rm c}$ photometry of SU Ursae Majoris during 2011 December–2012 February using OAO/MITSuME. Our photometry…”
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Discovery of a New Dwarf Nova, TSS J022216.4+412259.9: WZ Sge-Type Dwarf Nova Breaking the Shortest Superhump Period Record by Imada, Akira, Kubota, Kaori, Kato, Taichi, Nogami, Daisaku, Maehara, Hiroyuki, Nakajima, Kazuhiro, Uemura Ryoko Ishioka, Makoto

“…We report on the time-resolved CCD photometry of a newly discovered variable star, TSS J022216.4 $+$ 412259.9 during an outburst in a 2005 November–December…”
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Hinton & Nowlan’s computational Baldwin effect revisit: Are we happy with it? Akira Imada by Imada, Akira

“…In their seminal paper published in 1987, Hinton & Nowlan showed us an elegant experiment which might be called an evolution with the Baldwin effect in…”
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Spectroscopic Observations of the WZ Sge-Type Dwarf Nova GW Librae during its 2007 Superoutburst by Hiroi, Kazuo, Nogami, Daisaku, Ueda, Yoshihiro, Moritani, Yuuki, Soejima, Yuichi, Imada, Akira, Hashimoto, Osamu, Kinugasa, Kenzo, Honda, Satoshi, Narusawa, Shin-ya, Sakamoto, Makoto, Iizuka, Ryo, Matsuda, Kentaro, Naito, Hiroyuki, Iijima, Takashi, Fujii, Mitsugu

“…We carried out an international spectroscopic observation campaign of the dwarf nova GW Librae (GW Lib) during its 2007 superoutburst. Our observation period…”
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Discovery of a WZ Sge-Type Dwarf Nova, SDSS J102146.44+234926.3: Unprecedented Infrared Activity during a Rebrightening Phase by Uemura, Makoto, Arai, Akira, Krajci, Tom, Pavlenko, Elena, Shugarov, Sergei Yu, Katysheva, Nataly A., Goranskij, Vitalij P., Maehara, Hiroyuki, Imada, Akira, Kato, Taichi, Nogami, Daisaku, Nakajima, Kazuhiro, Ohsugi, Takashi, Yamashita, Takuya, Kawabata, Koji S., Nagae, Osamu, Chiyonobu, Shingo, Fukazawa, Yasushi, Mizuno, Tsunefumi, Katagiri, Hideaki, Takahashi, Hiromitsu, Ueda, Atsushi, Hayashi, Takehiro, Okita, Kiichi, Yoshida, Michitoshi, Yanagisawa, Kenshi, Sato, Shuji, Kino, Masaru, Sadakane, Kozo

“…Several SU UMa-type dwarf novae and WZ Sge-type stars tend to exhibit rebrightenings after superoutbursts. The rebrightening phenomenon is problematic for the…”
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Discovery of a Promising Candidate of WZ Sge-Type Dwarf Novae, ASAS 160048−4846.2: Evidence for Double-Peaked Humps by Imada, Akira, Monard, L. A. G. Berto

“…We report on time-resolved CCD photometry during the 2005 June outburst of a dwarf nova, ASAS 160048 $-$ 4846.2. The observed light curves unambiguously showed…”
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Superhump Development during the 2005 Superoutburst of 1RXS J053234+624755 by Imada, Akira, Henden, Arne, Kato, Taichi, Moritani, Yuuki, Sumiyoshi, Masanao, Tanada, Syunsuke, Omodaka, Toshihiro, Ishioka, Ryoko, Uemura, Makoto, Yanagisawa, Kenshi, Nogami, Daisaku

“…We report on time-resolved CCD photometry of the 2005 March/April superoutburst of a recently confirmed SU UMa-type dwarf nova, 1RXS J053234+624755. The…”
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