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Title:
The Birth Place of the Type Ic Supernova 2007gr
Authors:
Crockett, R. Mark; Maund, Justyn R.; Smartt, Stephen J.; Mattila, Seppo; Pastorello, Andrea; Smoker, Jonathan; Stephens, Andrew W.; Fynbo, Johan; Eldridge, John J.; Danziger, I. John; Benn, Christopher R.
Affiliation:
AA(Astrophysics Research Centre, School of Maths and Physics, Queen's University Belfast, BT7 1NN, Northern Ireland, UK; .), AB(Department of Astronomy and McDonald Observatory, University of Texas, 1 University Station, C1400, Austin, TX 78712.), AC(Astrophysics Research Centre, School of Maths and Physics, Queen's University Belfast, BT7 1NN, Northern Ireland, UK; .), AD(Astrophysics Research Centre, School of Maths and Physics, Queen's University Belfast, BT7 1NN, Northern Ireland, UK; .; Tuorla Observatory, University of Turku, Väisäläntie 20, FI-21500 Piikkiö, Finland), AE(Astrophysics Research Centre, School of Maths and Physics, Queen's University Belfast, BT7 1NN, Northern Ireland, UK; .), AF(Astrophysics Research Centre, School of Maths and Physics, Queen's University Belfast, BT7 1NN, Northern Ireland, UK; .), AG(Gemini Observatory, 670 North A'ohoku Place, Hilo, HI 96720.), AH(Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej, DK-2100 Copenhagen, Denmark.), AI(Astrophysics Research Centre, School of Maths and Physics, Queen's University Belfast, BT7 1NN, Northern Ireland, UK; .), AJ(INAF, Osservatorio Astronomico di Trieste, via G.B. Tiepolo 11, 34131 Trieste, Italy.; Department of Astronomy, University of Trieste, via G.B. Tiepolo 11, 34131 Trieste, Italy.), AK(Isaac Newton Group, Apartado 321, E-38700 Santa Cruz de La Palma, Spain.)
Publication:
The Astrophysical Journal, Volume 672, Issue 2, pp. L99-L102. (ApJL Homepage)
Publication Date:
01/2008
Origin:
UCP
ApJ Keywords:
Galaxies: Individual: NGC Number: NGC 1058, Stars: Evolution, Stars: Supernovae: General, supernovae: individual (2007gr)
DOI:
10.1086/527299
Bibliographic Code:
2008ApJ...672L..99C

Abstract

We report our attempts to locate the progenitor of the peculiar Type Ic SN 2007gr in Hubble Space Telescope (HST) preexplosion images of the host galaxy, NGC 1058. Aligning adaptive optics Altair/NIRI imaging of SN 2007gr from the Gemini (North) Telescope with the preexplosion HST WFPC2 images, we identify the supernova (SN) position on the HST frames with an accuracy of 20 mas. Although nothing is detected at the SN position, we show that it lies on the edge of a bright source, 134+/-23mas (6.9 pc) from its nominal center. On the basis of its luminosity, we suggest that this object is possibly an unresolved, compact, and coeval cluster and that the SN progenitor was a cluster member, although we note that model profile fitting favors a single bright star. We find two solutions for the age of this assumed cluster: 7-/+0.5 Myr and 20-30 Myr, with turnoff masses of 28+/-4 Msolar and 12-9 Msolar, respectively. Preexplosion ground-based K-band images marginally favor the younger cluster age/higher turnoff mass. Assuming the SN progenitor was a cluster member, the turnoff mass provides the best estimate for its initial mass. More detailed observations, after the SN has faded, should determine whether the progenitor was indeed part of a cluster and, if so, allow an age estimate to within ~2 Myr, thereby favoring either a high-mass single star or lower-mass interacting binary progenitor.
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