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Detection of Preshock Dense Circumstellar Material of SN 1978K

Chu, You-Hua and Caulet, Adeline and Montes, Marcos J. and Panagia, Nino and Van Dyk, Schuyler D. and Weiler, Kurt W. (1999) Detection of Preshock Dense Circumstellar Material of SN 1978K. Astrophysical Journal, 512 (1). L51-L54. ISSN 1538-4357. https://resolver.caltech.edu/CaltechAUTHORS:20170408-155343762

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Abstract

The supernova SN 1978K has been noted for its lack of emission lines broader than a few thousand kilometers per second since its discovery in 1990. Modeling of the radio spectrum of the peculiar SN 1978K indicates the existence of H II absorption along the line of sight. To determine the nature of this absorbing region, we have obtained a high-dispersion spectrum of SN 1978K at the wavelength range 6530-6610 Å. The spectrum shows not only the moderately broad Hα emission of the supernova ejecta but also narrow nebular Hα and [N II] emission. The high [N II] λ6583/Hα ratio, 0.8-1.3, suggests that this radio-absorbing region is a stellar ejecta nebula. The expansion velocity and emission measure of the nebula are consistent with those seen in ejecta nebulae of luminous blue variables. Previous low-dispersion spectra have detected a strong [N II] λ5755 line, indicating an electron density of (3–12) × 10^5 cm^(-3). We argue that this stellar ejecta nebula is probably part of the preshock dense circumstellar envelope of SN 1978K. We further suggest that SN 1997ab may represent a young version of SN 1978K.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/311866DOIArticle
https://arxiv.org/abs/astro-ph/9812240arXivDiscussion Paper
ORCID:
AuthorORCID
Van Dyk, Schuyler D.0000-0001-9038-9950
Additional Information:© 1999. The American Astronomical Society. Received 1998 October 19; accepted 1998 December 11; published 1999 January 13. We would like to thank the referee for useful suggestions to improve this Letter. Y. H. C. acknowledges the support of NASA Long-Term Space Astrophysics grant NAG5-3246. M. J. M. and K. W. W. wish to thank the Office of Naval Research for the 6.1 funding supporting this research.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NASANAG5-3246
Naval Research Laboratory6.1 Base Funding
Subject Keywords:circumstellar matter; galaxies: individual (NGC 1313) ; stars: mass loss; supernovae: individual (SN 1978K)
Issue or Number:1
Record Number:CaltechAUTHORS:20170408-155343762
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170408-155343762
Official Citation:You-Hua Chu et al 1999 ApJ 512 L51
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76086
Collection:CaltechAUTHORS
Deposited By: 1Science Import
Deposited On:30 May 2017 20:20
Last Modified:03 Oct 2019 16:57

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