Near infrared spectra of SN 1987A: Days 936 to 1445

Details Near infrared spectra of SN 1987A: Days 936 to 1445 Near infrared spectra of SN 1987A: Days 936 to 1445

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109..729b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 109, no. 2, p. 729-736

Astronomy and Astrophysics

Astronomy

9

Emission Spectra, Infrared Astronomy, Infrared Spectra, Iron, Near Infrared Radiation, Supernova 1987A, Astronomical Spectroscopy, Carbon Monoxide, Cobalt, Electron Energy, Hydrogen, Ionization, Line Spectra, Silicon

Scientific paper

We present 1-2.5 micrometer spectra of SN 1987A taken 936, 1058, 1294, and 1445 days after core collapse. The low resolution (lambda/delta lambda approx. equals 150) spectra show many lines from neutral and singly ionized species, most notably Fe and Si. We also tentatively detect Co emission. Measurements of several (Fe II) lines suggest that on day 936 the electron density in the Fe II emitting region was 104.0 +/- 0.3/cu cm. This density and the intensity of the (Fe II) lines suggest that the electron temperature on day 936 was between 1900 and 3000 K. We find that the electron temperature throughout these epochs is greater than approximately 1500 K, which seems to indicate that the Fe escaped and infrared catastrophe through day approximately 1500. The total mass of Fe estimated from our measurements is less than 0.04 solar mass, most of which if Fe0 and lower than many theoretical expectations. We also show that the Fe II and the observed H I emission lines probably come from different regions in the ejecta of the supernova.

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