SIMBAD references

2017ApJ...834..124Y - Astrophys. J., 834, 124-124 (2017/January-2)

The origin of the iron-rich knot in Tycho's supernova remnant.

YAMAGUCHI H., HUGHES J.P., BADENES C., BRAVO E., SEITENZAHL I.R., MARTINEZ-RODRIGUEZ H., PARK S. and PETRE R.

Abstract (from CDS):

X-ray observations of supernova remnants (SNRs) allow us to investigate the chemical inhomogeneity of ejecta, offering unique insight into the nucleosynthesis in supernova explosions. Here we present detailed imaging and spectroscopic studies of the "Fe knot" located along the eastern rim of the Type Ia SNR Tycho (SN 1572) using Suzaku and Chandra long-exposure data. Surprisingly, the Suzaku spectrum of this knot shows no emission from Cr, Mn, or Ni, which is unusual for the Fe-rich regions in this SNR. Within the framework of the canonical delayed-detonation models for SN Ia, the observed mass ratios MCr/MFe 0.023, MMn/MFe 0.012, and MNi/MFe 0.029 (at 90% confidence) can only be achieved for a peak temperature of (5.3-5.7) × 109 K and a neutron excess of 2.0×10–3. These constraints rule out the deep, dense core of a Chandrasekhar-mass white dwarf as the origin of the Fe knot and favor either incomplete Si burning or an α-rich freeze-out regime, probably close to the boundary. An explosive He burning regime is a possible alternative, although this hypothesis is in conflict with the main properties of this SNR.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): ISM: individual objects: ((SN 1572, Tycho's SNR)) - ISM: supernova remnants - nuclear reactions, nucleosynthesis, abundances - X-rays: ISM - X-rays: ISM

Simbad objects: 4

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2017ApJ...834..124Y and select 'bookmark this link' or equivalent in the popup menu


2021.06.23-18:30:06

© Université de Strasbourg/CNRS

    • Contact