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25 April 2024 |
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The birth place of the progenitor of the type Ic Supernova 2007gr | | R. Mark Crockett
; Justyn R. Maund
; Stephen J. Smartt
; Seppo Mattila
; Andrea Pastorello
; Jonathan Smoker
; Andrew W. Stephens
; Johan Fynbo
; John J. Eldridge
; I. John Danziger
; Christopher R. Benn
; | | Date: |
20 Sep 2007 | | Abstract: | We report our attempts to locate the progenitor of the peculiar type Ic SN
2007gr in HST pre-explosion images of the host galaxy, NGC 1058. Aligning
adaptive optics Altair/NIRI imaging of SN 2007gr from the Gemini (North)
Telescope with the pre-explosion HST WFPC2 images, we identify the SN position
on the HST frames with an accuracy of 20mas. Although nothing is detected at
the SN position we show that it lies on the edge of a bright source, 134+/-23
mas (6.9 pc) from its nominal centre. We suggest that this object is most
likely an unresolved, compact and coeval cluster and that the SN progenitor was
a cluster member. Based on its colour we find two solutions for the age of this
assumed cluster; 7-/+0.5 Myrs and 20-30 Myrs, with turn-off masses of 28+/-4
Msolar and 12-9 Msolar respectively. Prediscovery ground-based K-band and
Halpha images marginally favour the younger cluster age/higher turn-off mass.
Assuming the SN progenitor was a cluster member, the turn-off mass provides the
best estimate for its initial mass. More detailed observations, after the SN
has faded, should determine if the progenitor was indeed part of a cluster,
allow an age estimate to within ~2 Myrs and thereby favour either a high mass
single star or lower mass interacting binary progenitor. | | Source: | arXiv, 0709.2354 | | Services: | Forum | Review | PDF | Favorites | |
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