IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
artículos
Título:
Asymmetries in the Expansion and Emission from Young Supernova Remnants
Autor/es:
VIGH, CARLOS; VELAZQUEZ, PABLO; GOMEZ, DANIEL; REYNOSO, ESTELA; ESQUIVEL, ALEJANDRO; SCHNEITER, MATIAS
Revista:
ASTROPHYSICAL JOURNAL
Editorial:
IOP PUBLISHING LTD
Referencias:
Lugar: Chicago; Año: 2011 p. 32 - 41
ISSN:
0004-637X
Resumen:
We present two-dimensional and three-dimensional numerical simulations
of asymmetric young supernova remnants (SNRs) carried out with the
hydrodynamical code YGUAZÚ, aiming to quantitatively assess the
role of different factors that may give origin to such asymmetries in
their expansion. In particular, we are interested in modeling the
morphology of Tycho's SNR to address whether the companion star of a
Type Ia supernova progenitor has played a role in the subsequent
evolution of the remnant. With the results from the numerical
simulations, we can not only study the morphology of the SNR but also
compute the emission of the remnant in different spectral bands. In
particular, we simulate X-ray maps, which can be directly compared to
recent and previous observations of Tycho's SNR. Our results suggest
that the most likely explanation for Tycho's morphology is that after
the supernova (SN) explosion the shock front stripped the envelope of
its companion. We represent this effect by adding a conical region with
an enhanced density into the initial sphere immediately after the
explosion. Assuming that Tycho's companion was a massive red giant star,
we explore different values of the angle of aperture and mass excess of
the conical region. A good agreement with observational data was found
for the model with a mass excess of 0.3 M sun and an aperture
of 90°. After the collision with the SN shock wave, the companion
would become an He-rich star. This scenario would gain observational
support if a star with these characteristics is found in the vicinity of
the center of the SN explosion.