What was supernova 1988Z?

Details What was supernova 1988Z? What was supernova 1988Z?

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.250..786s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 250, June 15, 1991, p. 786-795.

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81

Peculiar Stars, Stellar Evolution, Supernovae, Light Curve, Pulsars, Stellar Spectrophotometry, Supermassive Stars

Scientific paper

Consideration is given to spectroscopic and photometric observations of SN 1988Z, a 'peculiar' type II SN which has evolved very differently from other well-studied SN. Its characteristics include a high luminosity at maximum light, unusually slow fading at late times, and strong narrow emission lines arising from dense circumstellar material. Broad emission features with V approximating 10,000 km/s persisted for over a year, and no absorption lines of P-Cygni profiles were observed, which is also exceptional for a type II SN. It is argued that SN 1988Z does not belong to an exotic new class, but was a normal type II SN which had a progenitor at the upper end of the mass range for red supergiants (up to 40 solar masses) with a dense, slow stellar wind which continued right up to core collapse. It is suggested that a pulsar formed during the collapse may be contributing to the slow decay in luminosity, but also that a substantial fraction of the excess energy comes from shocks.

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