TY - JOUR
T1 - THE ORIGIN of the IRON-RICH KNOT in TYCHO'S SUPERNOVA REMNANT
AU - Yamaguchi, Hiroya
AU - Hughes, John P.
AU - Badenes, Carles
AU - Bravo, Eduardo
AU - Seitenzahl, Ivo R.
AU - Martínez-Rodríguez, Héctor
AU - Park, Sangwook
AU - Petre, Robert
N1 - Publisher Copyright:
© 2017. The American Astronomical Society. All rights reserved.
PY - 2017/1/10
Y1 - 2017/1/10
N2 - 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.
AB - 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.
KW - ISM: individual objects (SN 1572 Tycho's SNR)
KW - ISM: supernova remnants
KW - X-rays: ISM
KW - nuclear reactions, nucleosynthesis, abundances
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U2 - 10.3847/1538-4357/834/2/124
DO - 10.3847/1538-4357/834/2/124
M3 - Article
AN - SCOPUS:85010408663
SN - 0004-637X
VL - 834
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 124
ER -