A new method infers inhomogeneities and asymmetries in high-energy transients from their radio synchrotron self-absorption spectra and demonstrates it on SN 2016coi and AT2018cow.
Inhomogeneities in type Ib/c supernovae: An inverse Compton scattering origin of the X-ray emission
2 Pith papers cite this work. Polarity classification is still indexing.
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abstract
Inhomogeneities in a synchrotron source can severely affect the conclusions drawn from observations regarding the source properties. However, their presence is not always easy to establish, since several other effects can give rise to similar observed characteristics. It is argued that the recently observed broadening of the radio spectra and/or light curves in some of the type Ib/c supernovae is a direct indication of inhomogeneities. As compared to a homogeneous source, this increases the deduced velocity of the forward shock and the observed correlation between total energy and shock velocity could in part be due to a varying covering factor. The X-ray emission from at least some type Ib/c supernovae is unlikely to be synchrotron radiation from an electron distribution accelerated in a non-linear shock. Instead it is shown that the observed correlation during the first few hundred days between the radio, X-ray and bolometric luminosities indicates that the X-ray emission is inverse Compton scattering of the photospheric photons. Inhomogeneities are consistent with equipartition between electrons and magnetic fields in the optically thin synchrotron emitting regions.
fields
astro-ph.HE 2years
2026 2verdicts
UNVERDICTED 2representative citing papers
Late-time radio observations of SN 2012au show re-brightening best explained by emission from a newborn pulsar wind nebula rather than continued shock interaction with circumstellar material.
citing papers explorer
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Constraining inhomogeneities and asymmetries in SNe, FBOTs, and other high-energy transients from unresolved radio observations
A new method infers inhomogeneities and asymmetries in high-energy transients from their radio synchrotron self-absorption spectra and demonstrates it on SN 2016coi and AT2018cow.
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Old and Bright: The Remarkable Radio Brightening of the Engine-driven SN 2012au Several Years After Explosion Signals the Birth of a PWN
Late-time radio observations of SN 2012au show re-brightening best explained by emission from a newborn pulsar wind nebula rather than continued shock interaction with circumstellar material.