Spectroscopy of supernova 1987A at 1-4 microns. II - Days 377 to 1114

Details Spectroscopy of supernova 1987A at 1-4 microns. II - Days 377 to 1114 Spectroscopy of supernova 1987A at 1-4 microns. II - Days 377 to 1114

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.261..535m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 261, no. 3, p. 535-572.

Astronomy and Astrophysics

Astronomy

55

Infrared Spectra, Infrared Stars, Stellar Spectra, Supernova 1987A, Cosmic Dust, Interstellar Extinction

Scientific paper

IR spectroscopy of SN 1987A has continued through the second and third years of its existence, allowing unprecedented coverage of the late-time behavior of a supernova. We present the data and their analysis. The continuum emission in the L window is interpreted in terms of dust condensation which had commenced by day 350. The mass of dust formed exceeded 0.0003 solar mass, possibly by a large factor, and it probably had a clumped distribution. Forbidden lines increased in prominence, especially those of forbidden Fe II. The similarity of linewidths for a wide range of elements confirms extensive mixing of the ejecta. Up to day about 500, most lines were redshifted with respect to the supernova center of mass, possibly due to a spatially biased, clumped distribution of material. After day about 500 most lines exhibited a shift to the blue, probably due to inhomogeneous, localized cooling and dust condensation. By the end of year 3, the decline rate of lines and of the JHK continuum roughly matched the radioactive decay rate. This may also be an indication of strong clumping. The ejecta of SN 1987A were extensively mixed and yet highly inhomogeneous; high-excitation emission zones coexisted with localized, cold concentrations of dust and molecules.

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