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The origin of polarization in kilonovae and the case of the gravitational-wave counterpart AT 2017gfo
M. Bulla, S. Covino, K. Kyutoku +8
The Gravitational Wave (GW) event GW 170817 was generated by the coalescence of two neutron stars (NS) and produced an electromagnetic transient, labelled AT 2017gfo, that was targ…
The Fast, Luminous Ultraviolet Transient AT2018cow: Extreme Supernova, or Disruption of a Star by an Intermediate-Mass Black Hole?
Daniel A. Perley, Paolo A. Mazzali, Lin Yan +60
Wide-field optical surveys have begun to uncover large samples of fast (t_rise < 5d), luminous (M_peak < -18), blue transients. While commonly attributed to the breakout of a super…
Free Neutron Ejection From Shock Breakout in Binary Neutron Star Mergers
Ayako Ishii, Toshikazu Shigeyama, Masaomi Tanaka
Merging neutron stars generate shock waves that disintegrate heavy nuclei into nucleons especially in the outer envelope. It is expected that some of such neutrons having avoided c…
Radiative transfer simulation for the optical and near-infrared electromagnetic counterparts to GW170817
Kyohei Kawaguchi, Masaru Shibata, Masaomi Tanaka
Recent detection of gravitational waves from a binary-neutron star merger (GW170817) and the subsequent observations of electromagnetic counterparts provide a great opportunity to…
Multi-band polarization of Type IIP supernovae due to light echo from circumstellar dust
Takashi Nagao, Keiichi Maeda, Masaomi Tanaka
Type IIP supernovae (SNe IIP) often show relatively high continuum polarization (\%) in the late phase. This polarization feature is generally believed to be due to an inne…
Low-luminosity Type IIP Supernova 2016bkv with early-phase circumstellar interaction
Tatsuya Nakaoka, Koji S. Kawabata, Keiichi Maeda +22
We present optical and near-infrared observations of a low-luminosity Type IIP supernova (SN) 2016bkv from the initial rising phase to the plateau phase. Our observations show that…