An overview of the Seimei telescope, a 3.8 m optical infrared telescope located on Mt.
Chikurinji in the Okayama prefecture of Japan, is presented. Seimei is a segmented-mirror …

We present extensive optical/ultraviolet observations and modelling analysis for the nearby
SN 1987A-like peculiar Type II supernova (SN) 2018hna. Both photometry and spectroscopy …

Type II supernovae (SNe II), which show abundant hydrogen in their spectra, belong to a
class of SNe with diverse observed properties. It is commonly accepted that SNe II are …

Massive stars die an explosive death as a core-collapse supernova (CCSN). The exact
physical processes that cause the collapsing star to rebound into an explosion are not well …

Abstract An Ellerman Bomb (EB) is a kind of small scale reconnection event, which is
ubiquitously formed in the upper photosphere or the lower chromosphere. The low …

The early phases of the observed evolution of the supernovae (SNe) are expected to be
dominated by the shock breakout and 'flash'ionization of the surrounding circumstellar …

Light emission in the first hours and days following core-collapse supernovae is dominated
by the escape of photons from the expanding shock-heated envelope. In preceding papers …

The Neil Gehrels Swift Observatory has proven to be an extraordinary supernova (SN)
observatory. The clearest application of Swift's unique strengths is obtaining very early UV …

Rapid variability before and near the maximum brightness of supernovae has the potential
to provide a better understanding of nearly every aspect of supernovae, from the physics of …

Massive stars are the workhorse of the Universe. While accounting for a minute fraction of
baryonic mass, their influence on the cosmos is profound. Their lives and deaths lead to …