astro-ph coffee suggested papers for Mon, May 11 at 11:30 AM and Wed, May 06, 2015 at 01:30 PM

astro-ph coffee will be held at the date and time above. Some suggested papers of interest are listed below.

4 May 2015

Seitenzahl et al. (2009) have predicted that $\sim 3$ years after its explosion, the light we receive from a Type Ia supernova will come mostly from reprocessing of electrons and X-rays emitted by the radioactive decay chain $^{57}{\rm Co}~\to~^{57}{\rm Fe}$, instead of positrons from the decay chain $^{56}{\rm Co}~\to~^{56}{\rm Fe}$ that dominates the supernova light at earlier times. Using the Hubble Space Telescope, we followed the light curve of the Type Ia supernova SN2012cg out to $1055$ ...

Web Article:

29 Apr 2015

We propose a heuristic unification of dark matter and dark energy in terms of a single dark fluid with a logotropic equation of state $P=A\ln(\rho/\rho_P)$, where $\rho$ is the rest-mass density, $\rho_P$ is the Planck density, and $A$ is the logotropic temperature. The energy density $\epsilon$ is the sum of a rest-mass energy term $\rho c^2$ mimicking dark matter and an internal energy term $u(\rho)=-P(\rho)-A$ mimicking dark energy. The logotropic temperature is approximately given by $A \si...

30 Apr 2015

We have discovered a luminous light echo around the normal Type II-Plateau Supernova (SN) 2012aw in Messier 95 (M95; NGC 3351), detected in images obtained approximately two years after explosion with the Wide Field Channel 3 on-board the Hubble Space Telescope (HST) by the Legacy ExtraGalactic Ultraviolet Survey (LEGUS). The multi-band observations span from the near-ultraviolet through the optical (F275W, F336W, F438W, F555W, and F814W). The apparent brightness of the echo at the time was ~21... v0.99.3fbd based on the original Updated 2015/05/06 13:09:57

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