Infrared Photometry and Spectrophotometry of Supernova 1987A - Part Two - 1987NOV to 1991MAR Observations

Details Infrared Photometry and Spectrophotometry of Supernova 1987A - Part Two - 1987NOV to 1991MAR Observations Infrared Photometry and Spectrophotometry of Supernova 1987A - Part Two - 1987NOV to 1991MAR Observations

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...273..451b&link_type=abstract

Astronomy and Astrophysics, Vol.273, NO. 2/JUNII, P. 451, 1993

Astronomy and Astrophysics

Astrophysics

34

Scientific paper

We present the infrared (1-20 micron) observations of SN 1987A obtained at ESO La Silla between 29 October 1987 and 27 March 1991 (day 1493); photometry and narrow band CVF spectrophotometry (λ/{DELTA}λ ~ 60) were acquired during that period. The infrared light curves and the spectra are shown and discussed. The spectral energy distribution is dominated by an increasing IR excess after day 530 (beyond 3.5 microns) due to the presence of dust in the envelope which was first discovered by its spectroscopic signature. We show that dust is still present at least until day ~1400, and that the two zone model for the expanding envelope, suggested from the visible spectra obtained at ESO, can account for the observed changes in the near-infrared colours in the period days 530-560. Hydrogen lines, observed in the spectrum from the very beginning, are present until day 1109 (although Brγ is hardly noticeable on the 9 March 1990 spectrum) and we describe the variations of their intensities throughout our monitoring period. Attention is drawn to the presence of CO emission observed until November 1988, and to the evolution of cobalt through the observation of the fine structure line of [Co II] at 10.52 microns. The temporal behaviour of the emission lines due to [Ni I] 3.12 microns and [Si I] + [Fe II] 1.644 microns are also shown.

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