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On the progenitor of the Type IIP SN 2013ej in M74

Fraser, Morgan, Maund, Justyn R., Smartt, Stephen J., Kotak, Rubina, Lawrence, Andy, Bruce, Alastair, Valenti, Stefano, Yuan, Fang, Benetti, Stefano, Chen, Ting-Wan, Gal-Yam, Avishay, Inserra, Cosimo ORCID: and Young, David R. 2014. On the progenitor of the Type IIP SN 2013ej in M74. Monthly Notices of the Royal Astronomical Society: Letters 439 (1) , L56-L60. 10.1093/mnrasl/slt179

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We use natural seeing imaging of SN 2013ej in M74 to identify a progenitor candidate in archival Hubble Space Telescope (HST) + Advanced Camera for Survey images. We find a source coincident with the supernova (SN) in the F814W filter within the total 75 mas (∼3 pc astrometric uncertainty; however, the position of the progenitor candidate in contemporaneous F435W and F555W filters is significantly offset. We conclude that the ‘progenitor candidate’ is in fact two physically unrelated sources; a blue source which is likely unrelated to the SN, and a red source which we suggest exploded as SN 2013ej. Deep images with the same instrument on board HST taken when the SN has faded (in approximately two year's time) will allow us to accurately characterize the unrelated neighbouring source and hence determine the intrinsic flux of the progenitor in three filters. We suggest that the F814W flux is dominated by the progenitor of SN 2013ej, and assuming a bolometric correction appropriate to an M-type supergiant, we estimate that the mass of the progenitor of SN 2013ej was between 8 and 15.5 M⊙.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Oxford University Press (OUP): Policy P - Oxford Open Option A
ISSN: 1745-3933
Date of First Compliant Deposit: 24 January 2019
Date of Acceptance: 8 December 2013
Last Modified: 05 May 2023 18:56

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