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Spectroscopic observations of active solar-analog stars having high X-ray luminosity, as a proxy of superflare stars
Yuta Notsu, Satoshi Honda, Hiroyuki Maehara +4
Recent studies of solar-type superflare stars have suggested that even old slowly rotating stars similar to the Sun can have large starspots and superflares. We conducted high disp…
Statistical properties of superflares on solar-type stars with Kepler data
Yuta Notsu, Hiroyuki Maehara, Takuya Shibayama +5
Superflares are flares that release total energy 1010 times greater than that of the biggest solar flares with energy of 10 erg. We searched superflares on…
Candidate Water Vapor Lines to Locate the HO Snowline through High-Dispersion Spectroscopic Observations I. The Case of a T Tauri Star
Shota Notsu, Hideko Nomura, Daiki Ishimoto +4
Inside the HO snowline of protoplanetary disks, water evaporates from the dust-grain surface into the gas phase, whereas it is frozen out on to the dust in the cold region be…
Statistical properties of superflares on solar-type stars based on the Kepler 1-min cadence data
Hiroyuki Maehara, Takuya Shibayama, Yuta Notsu +4
We searched for superflares on solar-type stars using the Kepler short-cadence (1-min sampling) data in order to detect superflares with short duration. We found 187 superflares on…