Maund 2005 Ic SN 2004gt

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Title:		Luminosity and Mass Limits for the Progenitor of the Type Ic Supernova 2004gt in NGC 4038
Authors:		Maund, Justyn R.; Smartt, Stephen J.; Schweizer, Francois
Affiliation:		AA(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, U.K; jrm@ast.cam.ac.uk.), AB(Department of Physics and Astronomy, Queen's University Belfast, Belfast, BT7 1NN, UK.), AC(Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101.)
Publication:		The Astrophysical Journal, Volume 630, Issue 1, pp. L33-L36. (ApJ Homepage)
Publication Date:		09/2005
Origin:		UCP
ApJ Keywords:		Galaxies: Individual: NGC Number: NGC 4038, Stars: Evolution, Stars: Supernovae: General, supernovae: individual (2004gt)
Abstract Copyright:		(c) 2005: The American Astronomical Society
DOI:		10.1086/491620
Bibliographic Code:		2005ApJ...630L..33M

Abstract

We report on our attempts to locate the progenitor of the Type Ic supernova SN 2004gt in NGC 4038. We use high-resolution HST ACS images of SN 2004gt and have compared them with deep pre-explosion HST WFPC2 F336W, F439W, F555W, and F814W images. We identify the SN location on the pre-explosion frames with an accuracy of 5 mas. We show that the progenitor is below the detection thresholds of all the pre-explosion images. These detection limits are used to place luminosity and mass limits on the progenitor. The progenitor of SN 2004gt seems to be restricted to a low-luminosity high-temperature star, either a single WC star with an initial mass of >40 M_solar or a low-mass star in a binary. The pre-explosion data cannot distinguish between the two scenarios.

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