We present results from a spectropolarimetric survey of young supernovae completed at the Keck Observatory, including at least one example from each of the major supernova types: Ia (1997dt), Ib (1998T, 1997dq), Ib/c-pec (1997ef), IIn (1997eg), and II-P (1997ds). All objects show evidence for intrinsic polarization, suggesting that asphericity may be a common feature in young supernova atmosphe...

Recent observations of supernovae, supernova remnants, and radio pulsars suggest that there are correlations between pulsar kicks and spins, infrared and gamma-ray line profiles, supernova polarizations, and ejecta debris fields. A framework is emerging in which explosion asymmetries play a central role. The new perspective meshes recent multi–dimensional theoretical investigations of the explo...

In this research project, we try to find out how well we can point to core-collapse supernova by detecting supernova neutrino events in a water detector, and to investigate improvement of the pointing algorithm. A refined model is created of supernova neutrinos in which scattered electron events and 30 times more positron events are generated after a burst of supernova neutrinos has propagated ...

It is pointed out that a cavity supernova explosion of a moving massive star could result in a significant offset of the neutron star birthplace from the centre of the nearly spherical supernova remnant. Therefore: a) the high implied transverse velocities of a number of neutron stars (e.g. PSR B 1757-24, SGR 0526-66, 1E 0820-4247) could be reduced; b) the proper motion vector of the neutron st...

We study the effect of filter zero-point uncertainties on future supernova dark energy missions. Fitting for calibration parameters using simultaneous analysis of all Type Ia supernova standard candles achieves a significant improvement over more traditional fit methods. This conclusion is robust under diverse experimental configurations (number of observed supernovae, maximum survey redshift, ...

We present the discovery of a red supergiant star that exploded as supernova 2003gd in the nearby spiral galaxy M74. The Hubble Space Telescope (HST) and the Gemini Telescope imaged this galaxy 6 to 9 months before the supernova explosion, and subsequent HST images confirm the positional coincidence of the supernova with a single resolved star that is a red supergiant of 8(+4)(-2) solar masses....

Binary stars are important for a full understanding of stellar evolution. We present a summary of how predictions of the relative supernova rates varies between single and binary stars. We also show how the parameter space of different supernova types differs between single and binary stars. We then consider an important question of how to infer a supernova progenitor’s properties from pre-expl...

The type Ia supernova SN1998bu in M96 was observed by COMPTEL for a total of 88 days starting 17 days after the first detection of the supernova. The accumulated effective observation time was 4.14 Msec. The COMPTEL observations were performed in a special instrument mode improving the lowenergy sensitivity. We generated images in the 847 keV and 1238 keV lines of Co, using improved point sprea...

One examines the interaction and possible resonances between Supernova neutrinos and electron plasma waves. The neutrino phase space distribution and its boundary regions are analized in detail. It is shown that the boundary regions are too wide to consent non-linear resonant effects. The growth or damping rates induced by neutrinos are always proportional to the neutrino flux and G 2 F .

The recent HESS detections of supernova remnant shells in TeV γ-rays confirm the theoretical predictions that supernova remnants can operate as powerful cosmic ray accelerators. If these objects are responsible for the bulk of galactic cosmic rays, then they should accelerate protons and nuclei to 10eV and beyond, i.e. act as cosmic PeVatrons. The model of diffusive shock acceleration allows, u...