Astronomy and Astrophysics – Astronomy
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.339..123f&link_type=abstract
Nature (ISSN 0028-0836), vol. 339, May 11, 1989, p. 123-125.
Astronomy and Astrophysics
Astronomy
10
Cosmic Dust, Infrared Astronomy, Interstellar Extinction, Interstellar Matter, Molecular Clouds, Supernova 1987A, Chemical Composition, Luminosity, Stellar Envelopes, Ultraviolet Spectra
Scientific paper
A substantial increase in the 8-13 micron flux from SN1987A since May 1988 has been attributed to reradiation by an asymmetric circumstellar dust cloud located mainly behind the supernova at a distance of about 200 light days. The calculations of Roche et al. (1989) are extended here to consider the implications of such a cloud. It is concluded that the expected optical echo from the cloud should be resolvable and this, rather than an internal energy source, may cause the observed slowdown in dimming of the supernova. The reflected light may contribute substantially to the current optical luminosity. Observations should be made as soon as possible, for the phenomenon may be evanescent. The dust spectrum suggests that the dust is carbonaceous rather than silicaceous. The cloud behind the supernova may be truly interstellar.
Dwek Eli
Felten James. E.
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