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Record 1 of 20044
Light echoes - Type II supernovae
External Online Source: doi:10.1086/185055
Author and Affiliation:
Schaefer, Bradley E.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Abstract: Type II supernovae (SNs) light curves show a remarkable range of shapes. Data have been collected for the 12 Type II SNs that have light curve information for more than four months past maximum. Contrary to previous reports, it is found that (1) the decay rate after 100 days past maximum varies by almost an order of magnitude and (2) the light curve shapes are not bimodally distributed, but actually form a continuum. In addition, it is found that the extinctions to the SNs are related to the light curve shapes. This implies that the absorbing dust is local to the SNs. The dust is likely to be part of a circumstellar shell emitted by the SN progenitor that Dwek (1983) has used to explain infrared echoes. The optical depth of the shell can get quite large. In such cases, it is found that the photons scattered and delayed by reflection off dust grains will dominate the light curve several months after peak brightness. This 'light echo' offers a straightforward explanation of the diversity of Type II SN light curves.
Publication Date: Dec 01, 1987
Document ID:
19880033195
(Acquired Nov 28, 1995)
Accession Number: 88A20422
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 323; L51-L54
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 4p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: LIGHT CURVE; SUPERNOVAE; VISIBLE SPECTRUM; ASTRONOMICAL MODELS; ECHOES; STELLAR ENVELOPES
Imprint And Other Notes: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 323, Dec. 1, 1987, p. L51-L54.
Availability Source: Other Sources
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