The evolution of the infrared emission from the Type II supernova 1980k in NGC 6946 - The dust formation model

Details The evolution of the infrared emission from the Type II supernova 1980k in NGC 6946 - The dust formation model The evolution of the infrared emission from the Type II supernova 1980k in NGC 6946 - The dust formation model

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...274..168d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 274, Nov. 1, 1983, p. 168-174. Research supported by the University of Mary

Astronomy and Astrophysics

Astrophysics

66

Astronomical Models, Cosmic Dust, Infrared Radiation, Spiral Galaxies, Stellar Evolution, Supernovae, Astronomical Photometry, Cosmology, Stellar Atmospheres, Thermal Emission

Scientific paper

The paper presents 1-4 micron photometry of supernova 1980 k in NGC 6946 obtained over a period of 1 year following the outburst. During the period between 1980 November 1 and December 19, the infrared emission probably originated from the extended atmosphere of the expanding star. The JHKL colors and a 1.3-2.6-micron spectrum observed during this period correspond to those of a blackbody with an average temperature of about 5000 K. Observations around 1981 May 31 showed that the supernova developed an infrared excess after 1980 December. This infrared excess persisted through 1981 October and is consistent with the appearance of thermal emission from about 700 to 900 K dust in addition to a hotter photosphere. The similarity of this behavior to that of the infrared evolution of some novae suggests that dust formation may be occurring in the supernova ejecta. The hypothesis, that the emission arises from preexisting grains in a circumstellar shell which are heated by the supernova outburst, is also consistent with the data.

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