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Optical Spectropolarimetry and Asphericity of Type Ic SN 2007gr
Masaomi Tanaka, Koji S. Kawabata, Keiichi Maeda +2
We present optical spectropolarimetric observations of Type Ic supernova (SN) 2007gr with Subaru telescope at 21 days after the maximum brightness (~37 days after the explosion). N…
The Connection between Gamma-Ray Bursts and Extremely Metal-Poor Stars as Nucleosynthetic Probes of the Early Universe
K. Nomoto, N. Tominaga, M. Tanaka +2
The connection between the long GRBs and Type Ic Supernovae (SNe) has revealed the interesting diversity: (i) GRB-SNe, (ii) Non-GRB Hypernovae (HNe), (iii) X-Ray Flash (XRF)-SNe, a…
An optical supernova associated with the X-ray flash XRF 060218
E. Pian, P. A. Mazzali, N. Masetti +42
Long-duration gamma-ray bursts (GRBs) are associated with type Ic supernovae that are more luminous than average and that eject material at very high velocities. Less-luminous supe…
Hypernovae, Black-Hole-Forming Supernovae, and First Stars
K. Nomoto, N. Tominaga, H. Umeda +4
Recent studies of core-collapse supernovae have revealed the existence of two distinct classes of massive supernovae (SNe): 1) very energetic SNe (Hypernovae), whose kinetic energy…
Gamma-Ray Signatures of Supernovae and Hypernovae
K. Nomoto, K. Maeda, Y. Mochizuki +4
We review the characteristics of nucleosynthesis and radioactivities in 'Hypernovae', i.e., supernovae with very large explosion energies ($ \gsim 10^{52} $ ergs) and their -ray…