Conveners
Transients and Gamma-Ray Bursts III: Radio Transients and Novae
- Guillaume Dubus (CNRS IPAG)
Radio astronomy is currently exploring an intriguing new phase space that probes the
dynamic Universe on timescales of milliseconds. Recent development of sensitive, high time
resolution instruments has enabled the discovery of millisecond duration fast radio bursts
(FRBs). The FRB class encompasses a number of single pulses, each unique in its own way, hindering a consensus for their origin....
Thanks to the Fermi Large Area Telescope (LAT), novae have been established as a new class of particle accelerators and gamma-ray emitters, with 9 objects detected as transient GeV sources so far. A possible origin for this non-thermal emission is internal shocks in the nova ejecta, resulting from the interaction of a fast wind radiatively-driven by nuclear burning on the white dwarf with...
Classical Novae were revealed as a surprise source of gamma-rays in Fermi LAT observations. During the first 8 years since the LAT was launched, 6 novae in total have been detected to > 5 sigma in gamma-rays, in contrast to the 69 discovered optically in the same period. We attempt to resolve this discrepancy by assuming all novae are gamma-ray emitters, with peak one-day fluxes consistent to...
One of the great surprises from the Fermi Gamma-ray Space Telescope is the discovery that classical novae are sources of GeV gamma-ray emission. Despite the low velocities (~few thousand km/s) and low masses (~$10^{-5}$ solar masses) of their ejecta, these explosions still manage to produce populations of relativistic particles. The ENova team studies classical novae at all available...
With the recent arrival of the next generation of sensitive radio telescopes, we have been making rapid progress towards constraining the transient population at radio frequencies on a wide range of timescales. First, I will outline the current developments in blind searches; including the discovery of the first transient sources at low-frequencies by LOFAR and MWA, fast radio bursts, and...
