The Near-Infrared Spectrum of SN 1998S in NGC 3877

Details The Near-Infrared Spectrum of SN 1998S in NGC 3877 The Near-Infrared Spectrum of SN 1998S in NGC 3877

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.4707g&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #47.07; Bulletin of the American Astronomical Society, Vol. 30, p.1324

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We present near-infrared J, H, and K spectra of the Type IIn supernova 1998S in NGC 3877 taken ~ 100 days after maximum brightness with the 2.4m Hilter telescope at MDM. To our knowledge, this is the first near-infrared spectrum of a Type IIn event. The data show broad emission from hydrogen recombination lines, as well as emission from the first and second overtone bands of CO in the H and K spectra. Preliminary analysis suggests a CO overabundance of ~ 2 and a temperature in the CO forming region of 4000 to 4500 K. This is the third detection of CO emission in a Type II supernova, and may indicate that molecule formation is common in Type II events. The detected presence of CO in supernovae is important as molecular emission can be a strong coolant and is a first step toward dust formation.

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