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Ryou Ohsawa

Has grant

Assistant Professor

National Astronomical Observatory of Japan

Japan

Research Interests

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Professors in Japan Professors in Astronomy Astronomy professors in Japan

About

Ryou Ohsawa is an Assistant Professor at the National Astronomical Observatory of Japan. His research focuses on precise relative astrometry, extragalactic fast optical transients, and the photometric and spectroscopic study of astronomical phenomena. Recent articles include investigations into Type IIP supernovae and high-cadence surveys of blazars, as well as contributions to the PDRs4All project concerning the Orion Nebula. He actively contributes to advancements in near-infrared and mid-infrared imaging and spectroscopy.

Recent Grants

Grant: Close

Elucidation of the origin and evolution of small near-Earth objects by wide-field high-speed survey and immediate follow-up observations

Open Date: 2023-04-01

Close Date: 2026-03-31

Grant: Close

Investigation of Compositions of Insterplanetary Dust by Spectroscopic Video Observation

Open Date: 2018-04-01

Close Date: 2022-03-01

Grant: Close

Investigation of Carbonaceous Dust by Mid-Infrared Spectroscopy

Open Date: 2013-04-01

Close Date: 2015-03-01

Grant: Close

Study of processing dust in nearby galaxies based on observations with Herschel and AKARI

Open Date: 2011-04-01

Close Date: 2016-03-31

Articles (27)

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2022

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2022

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2022

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2021

Collaborators (42)

Yousuke Utsumi

准教授/Associate Professor

自然科学研究機構国立天文台/National Astronomical Observatory of Japan

JAPAN

Ryou Ohsawa

Research Interests

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About

Recent Grants

Articles (27)

An optical transient candidate of ≲2 s duration captured by wide-field video observations

Simultaneous Tricolor Video Observations of Three Tiny Near-Earth Asteroids with Subminute Rotation Periods

Self-consistent Emission-line Diagnostics with Integrated Extinction Correction

Demonstration of plate analysis, an algorithm for precise relative astrometry

Second-timescale Glints from Satellites and Space Debris Detected with Tomo-e Gozen

A search for extragalactic fast optical transients in the Tomo-e Gozen high-cadence survey

Intermediate-luminosity Type IIP SN 2021gmj: a low-energy explosion with signatures of circumstellar material

PDRs4All II. JWST’s NIR and MIR imaging view of the Orion Nebula

PDRs4All: IV. An embarrassment of riches: Aromatic infrared bands in the Orion Bar

PDRs4All: III. JWST's NIR spectroscopic view of the Orion Bar

Optical Variability of Blazars in the Tomo-e Gozen Northern Sky Transient Survey

JASMINE

PDRs4All

Lens Mass Estimate in the Galactic Disk Extreme Parallax Microlensing Event Gaia19dke

Investigation of mid-infrared long-term variability of dusty AGB stars using multi-epoch scan data of AKARI and WISE

Simultaneous multicolor photometry of the DESTINY+ target asteroid (3200) Phaethon

Follow-up Survey for the Binary Black Hole Merger GW200224_222234 Using Subaru/HSC and GTC/OSIRIS

Development of a flat calibration unit for accurate flat fielding in the mid-infrared region

Multicolor Photometry of Tiny Near-Earth Asteroid 2015 RN35 across a Wide Range of Phase Angles: Possible Mission-accessible A-type Asteroid

Fast optical flares from M dwarfs detected by a one-second-cadence survey with Tomo-e Gozen

Deep-learning real/bogus classification for the Tomo-e Gozen transient survey

Video observations of tiny near-Earth objects with Tomo-e Gozen

Detection of highly correlated optical and X-ray variations in SS Cygni with Tomo-e Gozen and NICER

Deep Simultaneous Limits on Optical Emission from FRB 20190520B by 24.4 fps Observations with Tomo-e Gozen

Dippers from TESS Full-frame Images. II. Spectroscopic Characterization of Four Young Dippers

PDRs4All: A JWST Early Release Science Program on radiative feedback from massive stars

Discovery of the Fastest Early Optical Emission from Overluminous SN Ia 2020hvf: A Thermonuclear Explosion within a Dense Circumstellar Environment

Collaborators (42)

Yousuke Utsumi

Jose A. Acosta-Pulido

Masateru Ishiguro

Shinsuke Abe

Sergei Klioner

Naoki Yoshida

Hajime Kawahara

Elisabetta Micelotta

Fumi Yoshida

Kenshi Yanagisawa

Yoonsoo P Bach

Kazumi Kashiyama

Tilman Hartwig

Pawel Zielinski

Ken’ichi Nomoto

Munetake Momose

Nozomu Tominaga

Sandra Brünken

Keisuke Isogai

Daisuke Kawata

Koji Kawabata

Hamid Hamidani

Tomohiko Sekiguchi

Noriyuki Matsunaga

Kenji Bekki

Meriem Elyajouri

Toshikazu Shigeyama

Takashi Nagao

Frédérick Poidevin

Masayuki Hirabayashi

Toshiya Ueta

Tomoki Morokuma

Satoshi TAKITA

Keiichi Maeda

Ko Arimatsu

Shigeyuki Sako

Takafumi Ootsubo

Hirofumi Noda

Smaranika Banerjee

Yuu Niino

Miho Kawabata

Boris Trahin

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