Radio and X-ray observations of SN 2006jd: another strongly interacting type IIn supernova.
CHANDRA P., CHEVALIER R.A., CHUGAI N., FRANSSON C., IRWIN C.M., SODERBERG A.M., CHAKRABORTI S. and IMMLER S.
Abstract (from CDS):
We report four years of radio and X-ray monitoring of the Type IIn supernova SN 2006jd at radio wavelengths with the Very Large Array, Giant Metrewave Radio Telescope, and Expanded Very Large Array; at X-ray wavelengths with Chandra, XMM-Newton, and Swift-XRT. We assume that the radio and X-ray emitting particles are produced by shock interaction with a dense circumstellar medium. The radio emission shows an initial rise that can be attributed to free-free absorption by cool gas mixed into the nonthermal emitting region; external free-free absorption is disfavored because of the shape of the rising light curves and the low gas column density inferred along the line of sight to the emission region. The X-ray luminosity implies a preshock circumstellar density ∼106/cm3 at a radius r ∼ 2x1016 cm, but the column density inferred from the photoabsorption of X-rays along the line of sight suggests a significantly lower density. The implication may be an asymmetry in the interaction. The X-ray spectrum shows Fe line emission at 6.9 keV that is stronger than is expected for the conditions in the X-ray emitting gas. We suggest that cool gas mixed into the hot gas plays a role in the line emission. Our radio and X-ray data both suggest the density profile is flatter than r–2 because of the slow evolution of the unabsorbed emission.
circumstellar matter - hydrodynamics - radio continuum: general - stars: mass-loss - supernovae: general - supernovae: individual: SN 2006jd