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Detailed spectroscopic analysis of SN 1987A [electronic resource] : The distance to the LMC using the SEAM method

Published:
Washington, D.C. : United States. Dept. of Energy, 2002.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators:
United States. Department of Energy and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
Supernova 1987A remains the most well-studied supernova to date. Observations produced excellent broad-band photometric and spectroscopic coverage over a wide wavelength range at all epochs. We model the observed spectra from Day 1 to Day 81 using a hydrodynamical model. We show that good agreement can be obtained at times up to about 60 days, if we allow for extended nickel mixing. Later than about 60 days the observed Balmer lines become stronger than our models can reproduce. We show that this is likely due to a more complicated distribution of gamma-rays than we allow for in our spherically symmetric calculations. We present synthetic light curves in UBVRIJHK and a synthetic bolometric light curve. Using this broad baseline of detailed spectroscopic models we find a distance modulus mu = 18.5 +/- 0.2 using the SEAM method of determining distances to supernovae. We find that the explosion time agrees with that of the neutrino burst and is constrained at 68 percent confidence to within +/- 0.9 days. We argue that the weak Balmer lines of our detailed model calculations casts doubt on the accuracy of the purely photometric EPM method. We also suggest that Type IIP supernovae will be most useful as distance indicators at early times due to a variety of effects.
Report Numbers:
E 1.99:lbnl--50379
lbnl--50379
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Published through SciTech Connect.
05/21/2002.
"lbnl--50379"
": 400409900"
Astrophysical Journal 574 1 ISSN 0004-637X; ASJOAB FT
Mitchell, Robert C.; Baron, E.; Nugent, Peter E.; Lundqvist, Peter; Branch, David; Hauschildt, Peter H.; Blinnikov, Sergei; Pun, Chun S.J.
Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
National Science Foundation Grants AST-9731450 and AST-9720704, National Aeronautics and Space Administration Grants NAG 5-8425 and 5-3619 and NAG 5-3505
IBM Shared University Research, Russian Grant RFBR 02-02-16500, Pole Scientifique de Modelisation Numerique, Royal Swedish Academy, Swedish Research Council
Funding Information:
DE-AC02-05CH11231
NASA:LTSA
43CX01
View MARC record | catkey: 13825321