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Ryou Ohsawa

University of Tokyo

16H-index
147Paper Count
1.2KCitation Count
Published Papers 28
Publication Date
Second-timescale Glints from Satellites and Space Debris Detected with Tomo-e Gozen
err2025-11-25
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errMasaomi Tanaka; Ichiro Takahashi; Naoki Yoshida; Naonori Ueda; Akisato Kimura; Kazuma Mitsuda; Hirofumi Noda; Shigeyuki Sako; Noriaki Arima; Mitsuru Kokubo; Tomoki Morokuma; Yuu Niino; Nozomu Tominaga; Kenzo Kinugasa; Naoto Kobayashi; Sohei Kondo; Yuki Mori; Ryou Ohsawa; Hidenori Takahashi; Satoshi Takita
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Optical Variability of Blazars in the Tomo-e Gozen Northern Sky Transient Survey
err2024-06-12
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errZhang, Tianfang; Doi, Mamoru; Kokubo, Mitsuru; Sako, Shigeyuki; Ohsawa, Ryou; Tominaga, Nozomu; Tanaka, Masaomi; Fukazawa, Yasushi; Takahashi, Hidenori; Arima, Noriaki; Kobayashi, Naoto; Arimatsu, Ko; Okumura, Shin-ichiro; Kondo, Sohei; Kasuga, Toshihiro; Mori, Yuki; Niino, Yuu
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Intermediate-luminosity Type IIP SN 2021gmj: a low-energy explosion with signatures of circumstellar material
err2024-01-16
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errMurai, Yuta; Tanaka, Masaomi; Kawabata, Miho; Taguchi, Kenta; Teja, Rishabh Singh; Nakaoka, Tatsuya; Maeda, Keiichi; Kawabata, Koji S.; Nagao, Takashi; Moriya, Takashi J.; Sahu, D. K.; Anupama, G. C.; Tominaga, Nozomu; Morokuma, Tomoki; Imazawa, Ryo; Inutsuka, Satoko; Isogai, Keisuke; Kasuga, Toshihiro; Kobayashi, Naoto; Kondo, Sohei; Maehara, Hiroyuki; Mori, Yuki; Niino, Yuu; Ogawa, Mao; Ohsawa, Ryou; Okumura, Shin-ichiro; Saito, Sei; Sako, Shigeyuki; Takahashi, Hidenori; Uno, Kohki; Yamanaka, Masayuki
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Multicolor Photometry of Tiny Near-Earth Asteroid 2015 RN35 across a Wide Range of Phase Angles: Possible Mission-accessible A-type Asteroid
err2023-11-07
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errBeniyama, Jin; Ohsawa, Ryou; Avdellidou, Chrysa; Sako, Shigeyuki; Takita, Satoshi; Ishiguro, Masateru; Sekiguchi, Tomohiko; Usui, Fumihiko; Kinoshita, Shinichi W.; Lee, Kianhong; Takumi, Asami; Ferrais, Marin; Jehin, Emmanuel
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A search for extragalactic fast optical transients in the Tomo-e Gozen high-cadence survey
err2023-10-31
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errOshikiri, Kakeru; Tanaka, Masaomi; Tominaga, Nozomu; Morokuma, Tomoki; Takahashi, Ichiro; Tampo, Yusuke; Hamidani, Hamid; Arima, Noriaki; Arimatsu, Ko; Kasuga, Toshihiro; Kobayashi, Naoto; Kondo, Sohei; Mori, Yuki; Niino, Yuu; Ohsawa, Ryou; Okumura, Shin-ichiro; Sako, Shigeyuki; Takahashi, Hidenori
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Follow-up Survey for the Binary Black Hole Merger GW200224_222234 Using Subaru/HSC and GTC/OSIRIS
err2023-04-12
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errOhgami, Takayuki; Gonzalez, Josefa Becerra; Tominaga, Nozomu; Morokuma, Tomoki; Utsumi, Yousuke; Niino, Yuu; Tanaka, Masaomi; Banerjee, Smaranika; Poidevin, Frederick; Acosta-Pulido, Jose Antonio; Perez-Fournon, Ismael; Munoz-Darias, Teo; Akitaya, Hiroshi; Yanagisawa, Kenshi; Sasada, Mahito; Yoshida, Michitoshi; Simunovic, Mirko; Ohsawa, Ryou; Tanaka, Ichi; Terai, Tsuyoshi; Takagi, Yuhei
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Deep Simultaneous Limits on Optical Emission from FRB 20190520B by 24.4 fps Observations with Tomo-e Gozen
err2022-06-01
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errNiino, Yuu; Doi, Mamoru; Sako, Shigeyuki; Ohsawa, Ryou; Arima, Noriaki; Jiang, Ji-an; Tominaga, Nozomu; Tanaka, Masaomi; Li, Di; Niu, Chen-Hui; Tsai, Chao-Wei; Kobayashi, Naoto; Takahashi, Hidenori; Kondo, Sohei; Mori, Yuki; Aoki, Tsutomu; Arimatsu, Ko; Kasuga, Toshihiro; Okumura, Shin-ichiro
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Dippers from TESS Full-frame Images. II. Spectroscopic Characterization of Four Young Dippers
err2022-03-23
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errKasagi, Yui; Kotani, Takayuki; Kawahara, Hajime; Tajin, Tomoyuki; Muto, Takayuki; Aizawa, Masataka; Fujii, Michiko S.; Hattori, Kohei; Masuda, Kento; Momose, Munetake; Ohsawa, Ryou; Takita, Satoshi
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Discovery of the Fastest Early Optical Emission from Overluminous SN Ia 2020hvf: A Thermonuclear Explosion within a Dense Circumstellar Environment
err2021-12-08
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errJiang, Ji-an; Maeda, Keiichi; Kawabata, Miho; Doi, Mamoru; Shigeyama, Toshikazu; Tanaka, Masaomi; Tominaga, Nozomu; Nomoto, Ken'ichi; Niino, Yuu; Sako, Shigeyuki; Ohsawa, Ryou; Schramm, Malte; Yamanaka, Masayuki; Kobayashi, Naoto; Takahashi, Hidenori; Nakaoka, Tatsuya; Kawabata, Koji S.; Isogai, Keisuke; Aoki, Tsutomu; Kondo, Sohei; Mori, Yuki; Arimatsu, Ko; Kasuga, Toshihiro; Okumura, Shin-ichiro; Urakawa, Seitaro; Reichart, Daniel E.; Taguchi, Kenta; Arima, Noriaki; Beniyama, Jin; Uno, Kohki; Hamada, Taisei
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Calcium-rich Transient SN 2019ehk in a Star-forming Environment: Yet Another Candidate for a Precursor of a Double Neutron-star Binary
err2021-04-30
err18
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errNakaoka, Tatsuya; Maeda, Keiichi; Yamanaka, Masayuki; Tanaka, Masaomi; Kawabata, Miho; Moriya, Takashi J.; Kawabata, Koji S.; Tominaga, Nozomu; Takagi, Kengo; Imazato, Fumiya; Morokuma, Tomoki; Sako, Shigeyuki; Ohsawa, Ryou; Nagao, Takashi; Jiang, Ji-an; Burgaz, Umut; Taguchi, Kenta; Uemura, Makoto; Akitaya, Hiroshi; Sasada, Mahito; Isogai, Keisuke; Otsuka, Masaaki; Maehara, Hiroyuki
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J-GEM optical and near-infrared follow-up of gravitational wave events during LIGO's and Virgo's third observing run
err2021-01-28
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errSasada, Mahito; Utsumi, Yousuke; Itoh, Ryosuke; Tominaga, Nozomu; Tanaka, Masaomi; Morokuma, Tomoki; Yanagisawa, Kenshi; Kawabata, Koji S.; Ohgami, Takayuki; Yoshida, Michitoshi; Abe, Fumio; Adachi, Ryo; Akitaya, Hiroshi; Chong, Yang; Daikuhara, Kazuki; Hamasaki, Ryo; Honda, Satoshi; Hosokawa, Ryohei; Iida, Kota; Imazato, Fumiya; Ishioka, Chihiro; Iwasaki, Takumi; Jian, Mingjie; Kamei, Yuhei; Kanai, Takahiro; Kaneda, Hidehiro; Kaneko, Ayane; Katoh, Noriyuki; Kawai, Nobuyuki; Kubota, Keiichiro; Kubota, Yuma; Mamiya, Hideo; Matsubayashi, Kazuya; Morihana, Kumiko; Murata, Katsuhiro L.; Nagayama, Takahiro; Nakamura, Noriatsu; Nakaoka, Tatsuya; Niino, Yuu; Nishinaka, Yuki; Niwano, Masafumi; Nogami, Daisaku; Oasa, Yumiko; Oeda, Miki; Ogawa, Futa; Ohsawa, Ryou; Ohta, Kouji; Oide, Kohei; Onozato, Hiroki; Sako, Shigeyuki; Saito, Tomoki; Sekiguchi, Yuichiro; Shigeyama, Toshikazu; Shigeyoshi, Takumi; Shikauchi, Minori; Shiraishi, Kazuki; Suzuki, Daisuke; Takagi, Kengo; Takahashi, Jun; Takarada, Takuya; Takayama, Masaki; Takeuchi, Himeka; Tamura, Yasuki; Tanaka, Ryoya; Toma, Sayaka; Tozuka, Miyako; Uchida, Nagomi; Uzawa, Yoshinori; Yamanaka, Masayuki; Yasuda, Moeno; Yatsu, Yoichi
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Dippers from the TESS Full-frame Images. I. Results of the First One Year Data and Discovery of a Runaway Dipper
err2020-11-23
err20
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errTajiri, Tomoyuki; Kawahara, Hajime; Aizawa, Masataka; Fujii, Michiko S.; Hattori, Kohei; Kasagi, Yui; Kotani, Takayuki; Masuda, Kento; Momose, Munetake; Muto, Takayuki; Ohsawa, Ryou; Takita, Satoshi
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Long-term Near-infrared Brightening of Nonvariable OH/IR Stars
err2020-07-01
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errKamizuka, Takafumi; Nakada, Yoshikazu; Yanagisawa, Kenshi; Ohsawa, Ryou; Ita, Yoshifusa; Izumiura, Hideyuki; Mito, Hiroyuki; Onozato, Hiroki; Asano, Kentaro; Ueta, Toshiya; Miyata, Takashi
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New Constraint on the Atmosphere of (50000) Quaoar from a Stellar Occultation
err2019-11-19
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errArimatsu, Ko; Ohsawa, Ryou; Hashimoto, George L.; Urakawa, Seitaro; Takahashi, Jun; Tozuka, Miyako; Itoh, Yoichi; Yamashita, Misato; Usui, Fumihiko; Aoki, Tsutomu; Arima, Noriaki; Doi, Mamoru; Ichiki, Makoto; Ikeda, Shiro; Ita, Yoshifusa; Kasuga, Toshihiro; Kobayashi, Naoto; Kokubo, Mitsuru; Konishi, Masahiro; Maehara, Hiroyuki; Matsunaga, Noriyuki; Miyata, Takashi; Morii, Mikio; Morokuma, Tomoki; Motohara, Kentaro; Nakada, Yoshikazu; Okumura, Shin-ichiro; Sako, Shigeyuki; Sarugaku, Yuki; Sato, Mikiya; Shigeyama, Toshikazu; Soyano, Takao; Takahashi, Hidenori; Tarusawa, Ken'ichi; Tominaga, Nozomu; Watanabe, Jun-ichi; Yamashita, Takuya; Yoshikawa, Makoto
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Shape and Rotational Motion Models for Tumbling and Monolithic Asteroid 2012 TC4: High Time Resolution Light Curve with the Tomo-e Gozen Camera
err2019-03-26
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errUrakawa, Seitaro; Ohsawa, Ryou; Sako, Shigeyuki; Okumura, Shin-ichiro; Sakurai, Yuri; Takahashi, Jun; Imamura, Kazuyoshi; Naito, Hiroyuki; Watanabe, Fumitake; Nagayoshi, Ryoma; Murakami, Yasuhiko; Okazaki, Ryo; Sekiguchi, Tomohiko; Ishiguro, Masateru; Michikami, Tatsuhiro; Yoshikawa, Makoto
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The 1.87-and 2.07-μm observations of three Galactic Centre clusters with miniTAO at Atacama: classification of stellar components in massive star clusters
err2018-08-03
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PREAI
errTanaka, Masuo; Okumura, Shin-ichiro; Takahashi, Hidenori; Osawa, Kentaro; Motohara, Kentaro; Konishi, Masahiro; Tateuchi, Ken; Kato, Natsuko; Morokuma, Tomoki; Ohsawa, Ryou; Koshida, Shintaro; Yoshii, Yuzuru; Nishimura, Yuji
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Slow-scanning in Ground-based Mid-infared Observations
err2018-04-11
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errOhsawa, Ryou; Sako, Shigeyuki; Miyata, Takashi; Kamizuka, Takafumi; Okada, Kazushi; Mori, Kiyoshi; Uchiyama, Masahito S.; Yamaguchi, Junpei; Fujiyoshi, Takuya; Morii, Mikio; Ikeda, Shiro
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Near-infrared to Mid-infrared Observations of Galaxy Mergers: NGC 2782 and NGC 7727
err2018-01-19
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errOnaka, Takashi; Nakamura, Tomohiko; Sakon, Itsuki; Wu, Ronin; Ohsawa, Ryou; Kaneda, Hidehiro; Lebouteiller, Vianney; Roellig, Thomas L.
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DATA COMPRESSION FOR THE TOMO-e GOZEN USING LOW-RANK MATRIX APPROXIMATION
err2017-01-16
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errOAAI
errMorii, Mikio; Ikeda, Shiro; Sako, Shigeyuki; Ohsawa, Ryou
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AKARI/IRC NEAR-INFRARED SPECTRAL ATLAS OF GALACTIC PLANETARY NEBULAE
err2016-03-18
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errOhsawa, Ryou; Onaka, Takashi; Sakon, Itsuki; Matsuura, Mikako; Kaneda, Hidehiro
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