Discovery of an IR echo from a supernova dust cloud

Details Discovery of an IR echo from a supernova dust cloud Discovery of an IR echo from a supernova dust cloud

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.304..709g&link_type=abstract

Nature (ISSN 0028-0836), vol. 304, Aug. 25, 1983, p. 709, 710. Research supported by the U.S. Department of Energy.

Astronomy and Astrophysics

Astronomy

33

Cosmic Dust, Infrared Astronomy, Supernovae, Light Curve, Shock Heating, Stellar Envelopes

Scientific paper

Evidence is presented that the IR radiation from the supernova SN 1982g originates from heated dust. The IR observations were performed on 3.9 m and 3.8 m instruments in the 1.25, 1.65, 2.2, and 3.4 micron bands. Consideration was given to free-free emission from SN shock-heated circumstellar gas, thermal emission from grains formed in the SN, and thermal emission from preexisting circumstellar grains. Only the thermal emission from dust is an acceptable explanation, due to the lack of radio emissions and velocities that reach only 10,000 km/sec. The dust, however, would have to predate the SN explosion. The SN flash and pulse is calculated to be 10 light days thick, corresponding to the emission region in the dust cloud. The echo model defined by Morrison and Sartoir (1969) is used to show that the ionizing pulse from an SN passing through a dust cloud would fit the observed data.

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