Hiroyuki Maehara

助教/Assistant Professor

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

Japan

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About

Hiroyuki Maehara is an Assistant Professor at the National Astronomical Observatory of Japan. His research focuses on stellar flares, light curve variations in binary systems, and the observational characteristics of M-dwarf stars. Recent publications include studies on simultaneous optical and radio observations of stellar flares, as well as investigations into the temporal variations of flare occurrence rates on solar-type stars.

Articles (20)

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2025

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2021

Collaborators (10)

Rachel Osten

Space Telescope Science Institute

UNITED STATES

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Akito Tajitsu

特任准教授/Project Associate Professor

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

JAPAN

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Hugh Hudson

University of Glasgow

UNITED KINGDOM

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Kai Ikuta

Project Assistant Professor

Hitotsubashi University

JAPAN

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Kazunari Shibata

Kyoto University

JAPAN

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Valerio Alipio Roberts Machado Ribeiro

PORTUGAL

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Makoto Watanabe

Associate Professor

Okayama University

JAPAN

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Seiko Takagi

Hokkaido University

JAPAN

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Wataru Iwakiri

Assistant Professor

Chiba University

JAPAN

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Hisashi Hayakawa

Nagoya University

JAPAN

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Hiroyuki Maehara

Research Interests

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Articles (20)

Simultaneous Optical and Radio Observations of a Large Stellar Flare on EV Lac

Time evolution of a white-light flare accompanied by probable postflare loops on the M-type dwarf EV Lacertae

Temporal Variation of Flare Occurrence Rates via the Spot Evolution on the Sun and Solar-type Stars

Most active Algol-type system U Cephei: Drastic variations in the light curves obtained with the Transiting Exoplanet Survey Satellite

High-time-cadence Spectroscopy and Photometry of Stellar Flares on M-dwarf YZ Canis Minoris with Seimei Telescope and TESS. II. Statistical Properties of Blue/Red Asymmetries in the Hα Line

Optical observations of the high-mass X-ray binary MAXI J0709−159/LY Canis Majoris

High-time-cadence Spectroscopy and Photometry of Stellar Flares on M dwarf YZ Canis Minoris with the Seimei Telescope and TESS. I. Discovery of Rapid and Short-duration Prominence Eruptions

Rising Near-ultraviolet Spectra in Stellar Megaflares

Sun-like stars produce superflares roughly once per century

Simultaneous spectroscopic and TESS observations of the short-period Algol-type system: U Coronae Borealis

Magnitude Estimates for the Carrington Flare in 1859 September: As Seen from the Original Records

Detection of a High-velocity Prominence Eruption Leading to a CME Associated with a Superflare on the RS CVn-type Star V1355 Orionis

Starspot Mapping with Adaptive Parallel Tempering. II. Application to TESS Data for M-dwarf Flare Stars AU Microscopii, YZ Canis Minoris, and EV Lacertae

A Superflare on YZ Canis Minoris Observed by the Seimei Telescope and TESS: Red Asymmetry of Hα Emission Associated with White-light Emission

Morpho-kinematic Modeling of the Expanding Ejecta of the Extremely Slow Nova V1280 Scorpii

Multiwavelength observations of the black hole X-ray binary MAXI J1820+070 in the rebrightening phase

Discovery of a Long-duration Superflare on a Young Solar-type Star EK Draconis with Nearly Similar Time Evolution for Hα and White-light Emissions

A Very Metal-poor RR Lyrae Star with a Disk Orbit Found in the Solar Neighborhood

Optical spectroscopic observations of a symbiotic star MWC 560 in the mass accumulation phase

Optical spectroscopic monitoring of the symbiotic star MWC 560 before and after the 2018 unpredicted brightening

Collaborators (10)

Rachel Osten

Akito Tajitsu

Hugh Hudson

Kai Ikuta

Kazunari Shibata

Valerio Alipio Roberts Machado Ribeiro

Makoto Watanabe

Seiko Takagi

Wataru Iwakiri

Hisashi Hayakawa

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