SIMBAD references

2020ApJ...890..104S - Astrophys. J., 890, 104-104 (2020/February-3)

A nucleosynthetic origin for the southwestern Fe-rich structure in Kepler's supernova remnant.

SATO T., BRAVO E., BADENES C., HUGHES J.P., WILLIAMS B.J. and YAMAGUCHI H.

Abstract (from CDS):

Chandra X-ray observations of Kepler's supernova remnant indicate the existence of a high-speed Fe-rich ejecta structure in the southwestern region. We report strong K-shell emission from Fe-peak elements (Cr, Mn, Fe, Ni), as well as Ca, in this Fe-rich structure, implying that those elements could be produced in the inner area of the exploding white dwarf. We found Ca/Fe, Cr/Fe, Mn/Fe, and Ni/Fe mass ratios of 1.0%-4.1%, 1.0%-4.6%, 1%-11%, and 2%-30%, respectively. In order to constrain the burning regime that could produce this structure, we compared these observed mass ratios with those in 18 one-dimensional Type Ia nucleosynthesis models (including both near-MCh and sub-MCh explosion models). The observed mass ratios agree well with those around the middle layer of incomplete Si burning in Type Ia nucleosynthesis models with a peak temperature of ∼(5.0-5.3) x 109 K and a high metallicity, Z > 0.0225. Based on our results, we infer the necessity for some mechanism to produce protruding Fe-rich clumps dominated by incomplete Si-burning products during the explosion. We also discuss the future perspectives of X-ray observations of Fe-rich structures in other Type Ia supernova remnants.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Supernova remnants - Interstellar medium - Explosive nucleosynthesis - X-ray astronomy

Simbad objects: 7

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2021.06.12-12:49:37

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