SN 1997D, discovered in January 1997 by Duília de Mello in galaxy

NGC 1536 NGC commonly refers to: * New General Catalogue of Nebulae and Clusters of Stars, a catalogue of deep sky objects in astronomy NGC may also refer to: Companies * NGC Corporation, name of US electric company Dynegy, Inc. from 1995 to 1998 * Nat ...

Reticulum constellation Reticulum is a small, faint constellation in the southern sky. Its name is Latin for a small net, or reticle—a net of crosshairs at the focus of a telescope eyepiece that is used to measure star positions. The constellation is best viewed ...

is a first clearly identified example of atypical Type II supernova with a very low luminosity and expansion velocity.

Progenitor

There are two alternatives, a high-mass 25-40 solar masses star or smaller star with mass of 8-10 solar masses. As there is no evidence that neutron star was formed during the collapse of the star, it is likely that star was in upper spectrum of the mass.

Remnants

Observations of the light curve from SN 1997D showed no evidence of other energy sources in the expanding supernova envelope therefore it is unlikely that a Neutron star was created, all the evidence leads to the creation of the

stellar mass black hole A stellar black hole (or stellar-mass black hole) is a black hole formed by the gravitational collapse of a star. They have masses ranging from about 5 to several tens of solar masses. The process is observed as a hypernova explosion or as a gam ...

of approximately 3 solar masses.

References

From twilight to highlight: the physics of supernovae : proceedings of the ... By Wolfgang Hillebrandt, Bruno Leibundgut The fading of supernova 1997D Benetti, S., Turatto, M., Balberg, S., Zampieri, L., Shapiro, S. L., Cappellaro {{DEFAULTSORT:SN 1997D Supernovae Reticulum (constellation)