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16 April 2024 |
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Extraordinary Late-Time Infrared Emission of Type IIn Supernovae | | C. L. Gerardy
; R. A. Fesen
; K. Nomoto
; P. Garnavich
; S. Jha
; P. M. Challis
; R. P. Kirshner
; P. Hoeflich
; J. C. Wheeler
; | | Date: |
28 Apr 2002 | | Journal: | Astrophys.J. 575 (2002) 1007-1017 | | Subject: | astro-ph | | Affiliation: | Dartmouth, Univ. of Tokyo, Univ. of Notre Dame, CfA, Univ. of Texas | | Abstract: | Near-Infrared (NIR) observations are presented for five Type IIn supernovae (SN 1995N, SN 1997ab, SN 1998S, SN 1999Z, and SN 1999el) that exhibit strong infrared excesses at late times (t >= 100 d). H- and K-band emission from these objects is dominated by a continuum that rises toward longer wavelengths. The data are interpreted as thermal emission from dust, probably situated in a pre-existing circumstellar nebula. The IR luminosities implied by single temperature blackbody fits are quite large,> 10^(41 - 42) erg s^-1, and the emission evolves slowly, lasting for years after maximum light. For SN 1995N, the integrated energy release via IR dust emission was 0.5 -- 1 * 10^50 erg. A number of dust heating scenarios are considered, the most likely being an infrared echo poweredby X-ray and UV emissions from the shock interaction with a dense circumstellar medium. | | Source: | arXiv, astro-ph/0204477 | | Services: | Forum | Review | PDF | Favorites | |
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