The Type Ic Supernova 1994I in M51: Detection of Helium and Spectral Evolution
Creators
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Filippenko, Alexei V.1
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Barth, Aaron J.1
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Matheson, Thomas1
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Armus, Lee
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Brown, Michael J. I.1, 2
- Espey, Brian R.3
- Fan, Xiao-Ming4, 5
- Goodrich, Robert W.6, 7
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Ho, Luis C.1
- Junkkarinen, Vesa T.4
- Koo, David C.6
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Lehnert, Matthew D.8
- Martel, André R.6
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Mazzarella, Joseph M.9
- Miller, Joseph S.6
- Smith, Graeme H.6
- Tytler, David4
- Wirth, Gregory D.6
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1.
University of California, Berkeley
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2.
University of Arizona
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3.
Johns Hopkins University
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4.
University of California, San Diego
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5.
Columbia University
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6.
University of California, Santa Cruz
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7.
Space Telescope Science Institute
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8.
Lawrence Livermore National Laboratory
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9.
Infrared Processing and Analysis Center
Abstract
We present a series of spectra of SN 1994I in M51, starting 1 week prior to maximum brightness. The nebular phase began about 2 months after the explosion; together with the rapid decline of the optical light, this suggests that the ejected mass was small. Although lines of He I in the optical region are weak or absent, consistent with the Type Ic classification, we detect strong He I λ10830 absorption during the first month past maximum. Thus, if SN 1994I is a typical Type Ic supernova, the atmospheres of these objects cannot be completely devoid of helium. The emission-line widths are smaller than predicted by the model of Nomoto and coworkers, in which the iron core of a low-mass carbon-oxygen star collapses. They are, however, larger than in Type Ib supernovae.
Additional Information
© 1995 American Astronomical Society. Received 1995 May 19; accepted 1995 June 14. This work was supported by grants from NSF, most recently AST-9417213; from NASA, especially GO-2563.01-87A from STScI (operated by AURA, Inc., under NASA contract NAS5-26555); and from the DOE (contract W-7405-ENG-48). We thank the Lick staff for their assistance, and R. P. Harkness for the digital spectrum of SN 1984L (Fig. 2).Attached Files
Published - 1538-4357_450_1_L11.pdf
Files
1538-4357_450_1_L11.pdf
Additional details
Identifiers
- Eprint ID
- 34626
- Resolver ID
- CaltechAUTHORS:20121002-113037407
Funding
- NSF
- AST-9417213
- NASA
- GO-2563.01-87A
- NASA
- NAS5-26555
- Department of Energy (DOE)
- W-7405-ENG-48
- Space Telescope Science Institute
Dates
- Created
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2012-10-02Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field
Caltech Custom Metadata
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)