Direct imaging of the progenitors of massive, core-collapse supernovae

Details Direct imaging of the progenitors of massive, core-collapse supernovae Direct imaging of the progenitors of massive, core-collapse supernovae

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9041s&link_type=abstract

HST Proposal ID #9041

Physics

Hst Proposal Id #9041 Hot Stars

Scientific paper

Recent surveys of starforming galaxies in the nearby Universe are discovering significant numbers of supernovae which have massive star progenitors {Types II, Ib and Ic}. The extensive HST archive and high-resolution ground-based images of galaxies within 20 Mpc enables us to resolve and quantify their individual bright stellar content. As massive, evolved stars are the most luminous single objects in a galaxy, the progenitors of core-collapse supernovae should be directly detectable on pre-explosion images. The site of the Type II supernova 1999gi {in NGC3184, 8 Mpc distant} has been imaged in two colours by HST prior to explosion - it is a young star- forming region, with a resolved, massive stellar population. We request a post-explosion exposure to allow identification of the progenitor star, and its colours. We have deep, high- quality ground-based archive exposures of the pre-explosion region of 1999em {Type II in NGC1673, also at 8 Mpc distant}. We believe we have identified the progenitor as a mid-late G-type supergiant from its VRI colours, however a high-resolution HST image will indicate if this star really is coincident with the SN position at a more secure level. We are assimilating a database of all suitable exposures of nearby galaxies to allow similar future discoveries, and request similar follow-up exposures {as a TOO} if suitable pre- explosion material exists.

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