Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.5907r&link_type=abstract
American Astronomical Society Meeting 208, #59.07; Bulletin of the American Astronomical Society, Vol. 38, p.140
Astronomy and Astrophysics
Astronomy
Scientific paper
We performed Spitzer observations of Tycho's supernova remnant--the young prototype of Ia remnants-- with the three instruments of the IRAC, IRS and MIPS. Our primary goal is to investigate formation of dust in Type Ia supernovae originated from white dwarf deflagration, which has never been observed to date. While dust formation may be inhibited in Type Ia events by the relatively higher ejecta velocities and the abundances of the radioactive material, some theoretical models suggest that dust production could occur in Type Ia events. Bright MIPS 24 and 70 micron emission is detected from the entire remnant; the global morphology is shell-like, and almost identical between the two wavelengths. While the overall infrared morphology is similar to that in the X-ray ejecta emission, the infrared emission is not clumpy like the X-rays imaged by Chandra. The infrared emission coincides the regions of the reverse shock, but the IRS spectrum shows only a featureless continuum without lines. IRAC images show faint emission, which may be consistent with the absence of ionic lines in the IRS spectrum. The IRS spectrum lacks interstellar medium spectral features and the expected mass of heated dust is indeed very small because Tycho exploded in a low-density medium and is still very young. This leads us to suggest that we may be seeing dust formation in Tycho's supernova remnant rather than shock heated dust. The spectrum can be well fit either by Glassy Carbon and/or Fe dust; C and Fe are known to have large nucleosynthetic yields from Type Ia supernovae. The estimated dust mass can be as large as 0.5 solar mass. This implies that Type Ia supernovae may be significant sites of dust formation which could help to explain the substantial quantity of dust observed in the early Universe.
DeLaney Tracey
Hwang Una
Kozasa Takashi
Reach William
Rho Jeonghee
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