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

    29 Citations (Scopus)

    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
    Article number124
    JournalAstrophysical Journal
    Volume834
    Issue number2
    DOIs
    Publication statusPublished - 10 Jan 2017

    Fingerprint

    Dive into the research topics of 'THE ORIGIN of the IRON-RICH KNOT in TYCHO'S SUPERNOVA REMNANT'. Together they form a unique fingerprint.

    Cite this