New particles coupled to the Standard Model can equilibrate in stellar cores if they are sufficiently heavy and strongly coupled. In this work, we investigate astrophysical consequences of such a scenario for massive stars by incorporating new contributions equation state into art structure code. We focus on axions ``cosmological triangle,'' region parameter space with $300\text{ }\text{ }\math...

Condensation in the outer regions of decaying supernovae is an efficient source of dust with grain size up to more than 1µm. The largest grains leave the parent galaxy, thus forming " grey " intergalactic dust, which can explain the observed dimming of light from distant supernovae without invoking cosmic acceleration.

Interstellar turbulence is expected to dissipate quickly in the absence of continuous energy input. I examine the energy available for driving the turbulence from six likely mechanisms: magnetorotational instability, gravitational instability, protostellar outflows, H ii region expansion, stellar winds, and supernovae. I conclude that supernovae contribute far more energy than the other mechani...

We present the results of radio observations, taken primarily with the Very Large Array, of Supernovae 1993J, 2001gd, 2001em, 2002hh, 2004dj, and 2004et. We have fit a parameterized model to the multi-frequency observations of each supernova. We compare the observed and derived radio properties of these supernovae by optical classification and discuss the implications.

The absolute luminosities and homogeneity of early-time infrared (IR) light curves of type Ia supernovae are examined. Eight supernovae are considered. These are selected to have accurately known epochs of maximum blue light as well as having reliable distance estimates and/or good light curve coverage. Two approaches to extinction correction are considered. Owing to the low extinction in the I...

Gamma-ray bursts can appear to be a hundred times as luminous as supernovae, but their underlying energy source(s) have remained a mystery. However, there has been evidence for some time now of an association of gamma-ray bursts with supernovae of Type Ib and Ic, a fact which has been exploited by a number of models, to explain the gamma-ray burst phenomenon. Here we interpret the results of ba...

We study the late evolution of solar metallicity stars in the transition region between white dwarf formation and core collapse. This includes the super-asymptotic giant branch (super-AGB, SAGB) stars, which have massive enough cores to ignite carbon burning and form an oxygen-neon (ONe) core. The most massive SAGB stars have cores that may grow to the Chandrasekhar mass because of continued sh...

Rates and Progenitors of Type Ia Supernovae

Table 1: Possible sources of GW with their typical frequency. The last column lists the way to detect such signals. Frequency (Hz) Source Detection Method 10 Primordial Anisotropy of CBR 10 Primordial, Cosmic String Timing of ms pulsars Binary Starts 10 ÷ 10 Supermassive BH Laser interferometers in space Binaries of NS or BH 10 ÷ 10 Supernovae, Pulsars Laser interferometers on earth Coalescence...