Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341208t&link_type=abstract
American Astronomical Society, AAS Meeting #213, #412.08; Bulletin of the American Astronomical Society, Vol. 41, p.218
Astronomy and Astrophysics
Astronomy
Scientific paper
Scattered light echoes are very rare and have only been unambiguously resolved around a handful of sources. They offer one of the most effective means to study the structure and make-up of circumstellar and interstellar dust and gas. Light echoes provide exact three-dimensional positions of scattering dust, and also can be used to constrain that dust's composition, size and number density. Here, we present new data and analyses of echoes previously discovered around SN 1991T. These echoes appear to trace out a shell around the progenitor, either hourglass shaped or ellipsoidal, and with a size scale of 20-30lt-yr. Also the supernova may be significantly offset from the center of this shell. Like SN 1998bu (see poster by Lonsdale et al.), SN 1991T was a type Ia, thus it is unclear whether we are tracing the fossil remnant of the progenitor's outflows, or those of its binary companion.
Lonsdale Steven
Sugerman Ben
Thormann Adrien
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