THE ORIGIN of the IRON-RICH KNOT in TYCHO'S SUPERNOVA REMNANT

Hiroya Yamaguchi, John P. Hughes, Carles Badenes, Eduardo Bravo, Ivo R. Seitenzahl, Héctor Martínez-Rodríguez, Sangwook Park, Robert Petre

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

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 l∼ 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 -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.

Original languageEnglish (US)
Article number124
JournalAstrophysical Journal
Volume834
Issue number2
DOIs
StatePublished - Jan 10 2017

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

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

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