The origin of the iron-rich knot in Tycho's supernova remnant
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 Typ...
| Autores: | , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2017 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/99852 |
| Acceso en línea: | https://hdl.handle.net/2117/99852 https://dx.doi.org/10.3847/1538-4357/834/2/124 |
| Access Level: | acceso abierto |
| Palabra clave: | Supernovae ISM: individual objects (SN1572 Tycho's SNR) ISM: supernova remnants Nuclear reactions Nucleosynthesis Abundances - X-rays: ISM Supernoves Àrees temàtiques de la UPC::Física::Astronomia i astrofísica |
| Sumario: | 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 M(Cr)/M(Fe) < 0.023 , M(Mn)/M(Fe) < 0.012 , and M(Ni)/M(Fe) < 0.029 (at 90% confidence) can only be achieved for a peak temperature of (5.3–5.7)x10¿ K and a neutron excess of <~ 2.0x10¿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 a-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. |
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