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450 d of Type II SN 2013ej in optical and near-infrared

Yuan, Fang, Jerkstrand, A., Valenti, S., Sollerman, J., Seitenzahl, I. R., Pastorello, A., Schulze, S., Chen, T.-W., Childress, M. J., Fraser, M., Fremling, C., Kotak, R., Ruiter, A. J., Schmidt, B. P., Smartt, S. J., Taddia, F., Terreran, G., Tucker, B. E., Barbarino, C., Benetti, S., Elias-Rosa, N., Gal-Yam, A., Howell, D. A., Inserra, C., Kankare, E., Lee, M. Y., Li, K. L., Maguire, K., Margheim, S., Mehner, A., Ochner, P., Sullivan, M., Tomasella, L. and Young, D. R. 2016. 450 d of Type II SN 2013ej in optical and near-infrared. Monthly Notices of the Royal Astronomical Society 461 (2) , pp. 2003-2018. 10.1093/mnras/stw1419

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Abstract

We present optical and near-infrared photometric and spectroscopic observations of SN 2013ej, in galaxy M74, from 1 to 450 d after the explosion. SN 2013ej is a hydrogen-rich supernova, classified as a Type IIL due to its relatively fast decline following the initial peak. It has a relatively high peak luminosity (absolute magnitude MV = −17.6) but a small 56Ni production of ∼0.023 M⊙. Its photospheric evolution is similar to other Type II SNe, with shallow absorption in the Hα profile typical for a Type IIL. During transition to the radioactive decay tail at ∼100 d, we find the SN to grow bluer in B − V colour, in contrast to some other Type II supernovae. At late times, the bolometric light curve declined faster than expected from 56Co decay and we observed unusually broad and asymmetric nebular emission lines. Based on comparison of nebular emission lines most sensitive to the progenitor core mass, we find our observations are best matched to synthesized spectral models with a MZAMS = 12–15 M⊙ progenitor. The derived mass range is similar to but not higher than the mass estimated for Type IIP progenitors. This is against the idea that Type IIL are from more massive stars. Observations are consistent with the SN having a progenitor with a relatively low-mass envelope.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 23 January 2019
Date of Acceptance: 10 June 2016
Last Modified: 24 May 2019 14:09
URI: http://orca.cf.ac.uk/id/eprint/118673

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