492 citations · 1.4k across the 13 of their papers we have counts for
13 papers
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…
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…
High dispersion spectroscopy of solar-type superflare stars with Subaru/HDS
Yuta Notsu, Satoshi Honda, Hiroyuki Maehara +4
We carried out spectroscopic observations with Subaru/HDS of 50 solar-type superflare stars found from Kepler data. More than half (34 stars) of the target stars show no evidence o…
UFCORIN: A Fully Automated Predictor of Solar Flares in GOES X-Ray Flux
Takayuki Muranushi, Takuya Shibayama, Yuko Hada Muranushi +4
We have developed UFCORIN, a platform for studying and automating space weather prediction. Using our system we have tested 6,160 different combinations of SDO/HMI data as input da…
High Dispersion Spectroscopy of Solar-type Superflare Stars. III. Lithium Abundances
Satoshi Honda, Yuta Notsu, Hiroyuki Maehara +4
We report on the abundance analysis of Li in solar-type (G-type main sequence) superflare stars which were found by the analysis of Kepler photometric data. Li is a key element to…
Statistical properties of superflares on solar-type stars based on 1-min cadence data
Hiroyuki Maehara, Takuya Shibayama, Yuta Notsu +4
We searched for superflares on solar-type stars using Kepler data with 1 min sampling in order to detect superflares with short duration. We found 187 superflares on 23 solar-type…
High Dispersion Spectroscopy of Solar-type Superflare Stars. II. Stellar Rotation, Starspots, and Chromospheric Activities
Yuta Notsu, Satoshi Honda, Hiroyuki Maehara +4
We conducted high dispersion spectroscopic observations of 50 superflare stars with Subaru/HDS. These 50 stars were selected from the solar-type superflare stars that we had discov…
High Dispersion Spectroscopy of Solar-type Superflare Stars. I. Temperature, Surface Gravity, Metallicity, and
Yuta Notsu, Satoshi Honda, Hiroyuki Maehara +4
We conducted high dispersion spectroscopic observations of 50 superflare stars with Subaru/HDS, and measured the stellar parameters of them. These 50 targets were selected from the…
Two Sun-like Superflare Stars Rotating as Slow as the Sun
Daisaku Nogami, Yuta Notsu, Satoshi Honda +4
We report on the results of high dispersion spectroscopy of two `superflare stars', KIC 9766237, and KIC 9944137 with Subaru/HDS. Superflare stars are G-type main sequence stars, b…
Superflares on Solar Type Stars Observed with Kepler I. Statistical Properties of Superflares
Takuya Shibayama, Hiroyuki Maehara, Shota Notsu +6
By extending our previous study by Maehara et al. (2012), we searched for superflares on G-type dwarfs (solar type stars) using Kepler data for a longer period (500 days) than that…
High Dispersion Spectroscopy of the Superflare Star KIC6934317
Shota Notsu, Satoshi Honda, Yuta Notsu +5
We conducted the high-resolution spectroscopic observation with Subaru/HDS for a G-type star (KIC6934317). We selected this star from the data of the Kepler spacecraft. This star p…
Superflares on Solar-Type Stars Observed with Kepler II. Photometric Variability of Superflare-Generating Stars : A Signature of Stellar Rotation and Starspots
Yuta Notsu, Takuya Shibayama, Hiroyuki Maehara +6
We performed simple spot-model calculations for quasi-periodic brightness variations of solar-type stars showing superflares, by using Kepler photometric data. Most of superflare s…
Can Superflares Occur on Our Sun?
Kazunari Shibata, Hiroaki Isobe, Andrew Hillier +9
Recent observations of solar type stars with the Kepler satellite by Maehara et al. have revealed the existence of superflares (with energy of 10^33 - 10^35 erg) on Sun-like stars,…