175 citations · 391 across the 8 of their papers we have counts for
8 papers
Type Ib supernova Master OT J120451.50+265946.6: radio emitting shock with inhomogeneities crossing through a dense shell
Poonam Chandra, A. J. Nayana, Claes-Ingvar Bjornsson +4
We present radio observations of a Type Ib supernova (SN) Master OT J120451.50+265946.6. Our low frequency Giant Metrewave Radio Telescope (GMRT) data taken when the SN was in the…
Inhomogeneities and the modeling of radio supernovae
Claes-I. Bjornsson, Said T. Keshavarzi
Observations of radio supernovae often exhibit characteristics not readily accounted for by a homogeneous, spherically symmetric synchrotron model; e.g., flat-topped spectra/lightc…
Constraints on the progenitor system and the environs of SN 2014J from deep radio observations
M. A. Perez-Torres, P. Lundqvist, R. Beswick +11
We report deep EVN and eMERLIN observations of the Type Ia SN 2014J in the nearby galaxy M 82. Our observations represent, together with JVLA observations of SNe 2011fe and 2014J,…
Heating from free-free absorption and the mass-loss rate of the progenitor stars to supernovae
Claes-I. Bjornsson, Peter Lundqvist
An accurate determination of the mass-loss rate of the progenitor stars to core-collapse supernovae is often limited by uncertainties pertaining to various model assumptions. It is…
Properties of the three-dimensional structure in the central region of the supernova remnant SNR 0540-69.3
C. Sandin, P. Lundqvist, N. Lundqvist +3
We present and discuss new visual wavelength-range observations of the inner regions of the supernova remnant SNR 0540-69.3 that is located in the Large Magellanic Cloud (LMC). The…
Inhomogeneities in type Ib/c supernovae: An inverse Compton scattering origin of the X-ray emission
C. -I. Bjornsson
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 e…
Spectral evolution and polarization of variable structures in the pulsar wind nebula of PSR B0540-69.3
N. Lundqvist, P. Lundqvist, C. -I. Björnsson +4
We present high spatial resolution optical imaging and polarization observations of the PSR B0540-69.3 and its highly dynamical pulsar wind nebula (PWN) performed with HST, and com…
Radio Emission and Particle Acceleration in SN 1993J
Claes Fransson, Claes-Ingvar Björnsson
The radio light curves of SN 1993J are found to be well fit by a synchrotron spectrum, suppressed by external free-free absorption and synchrotron self-absorption. A standard r^-2…