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New Class of High-Energy Transients from Crashes of Supernova Ejecta with Massive Circumstellar Material Shells
Kohta Murase, Todd A. Thompson, Brian C. Lacki +1
A new class of core-collapse supernovae (SNe) has been discovered in recent years by optical/infrared surveys; these SNe suggest the presence of one or more extremely dense (~10^5-…
Role of line-of-sight cosmic ray interactions in forming the spectra of distant blazars in TeV gamma rays and high-energy neutrinos
Warren Essey, Oleg Kalashev, Alexander Kusenko +1
Active galactic nuclei (AGN) can produce both gamma rays and cosmic rays. The observed high-energy gamma-ray signals from distant blazars may be dominated by secondary gamma rays p…
Pre-discovery and Follow-up Observations of the Nearby SN 2009nr: Implications for Prompt Type Ia SNe
Rubab Khan, J. L. Prieto, G. Pojmanski +8
We present photometric and spectroscopic observations of the Type Ia supernova SN 2009nr in UGC 8255 (z=0.0122). Following the discovery announcement at what turned out to be ten d…
The SN 2008S Progenitor Star: Gone or Again Self-Obscured?
J. L. Prieto, D. M. Szczygiel, C. S. Kochanek +5
We obtained late-time optical and near-IR imaging of SN 2008S with the Large Binocular Telescope (LBT). We find that (1) it is again invisible at optical (UBVR) wavelengths to magn…
Revealing Type Ia supernova physics with cosmic rates and nuclear gamma rays
Shunsaku Horiuchi, John F. Beacom
Type Ia supernovae (SNIa) remain mysterious despite their central importance in cosmology and their rapidly increasing discovery rate. The progenitors of SNIa can be probed by the…
The Diffuse Supernova Neutrino Background
John F. Beacom
The Diffuse Supernova Neutrino Background (DSNB) is the weak glow of MeV neutrinos and antineutrinos from distant core-collapse supernovae. The DSNB has not been detected yet, but…