The superluminous supernova PS1-11ap: bridging the gap between low and high redshift
McCrum, M.; Smartt, S.J.; Kotak, R.; Rest, A.; Jerkstrand, A.; Inserra, C.; Rodney, S.A.; Chen, T. -W.; Howell, D.A.; Huber, M.E.; Pastorello, A.; Tonry, J.L.; Bresolin, F.; Kudritzki, R. -P.; Chornock, R.; Berger, E.; Smith, K.; Botticella, M.T.; Foley, R.J.; Fraser, M.; Milisavljevic, D.; Nicholl, M.; Riess, A.G.; Stubbs, C.W.; Valenti, S.; Wood-Vasey, W.M.; Wright, D.; Young, D.R.; Drout, M.; Czekala, I.; Burgett, W.S.; Chambers, K.C.; Draper, P.; Flewelling, H.; Hodapp, K.W.; Kaiser, N.; Magnier, E.A.; Metcalfe, N.; Price, P.A.; Sweeney, W.; Wainscoat, R.J.
T. -W. Chen
R. -P. Kudritzki
Dr Peter Draper firstname.lastname@example.org
Senior Computer Programmer
Dr Nigel Metcalfe email@example.com
We present optical photometric and spectroscopic coverage of the superluminous supernova (SLSN) PS1-11ap, discovered with the Pan-STARRS1 Medium Deep Survey at z = 0.524. This intrinsically blue transient rose slowly to reach a peak magnitude of Mu = −21.4 mag and bolometric luminosity of 8 × 1043 erg s−1 before settling on to a relatively shallow gradient of decline. The observed decline is significantly slower than those of the SLSNe-Ic which have been the focus of much recent attention. Spectroscopic similarities with the lower redshift SN2007bi and a decline rate similar to 56Co decay time-scale initially indicated that this transient could be a candidate for a pair instability supernova (PISN) explosion. Overall the transient appears quite similar to SN2007bi and the lower redshift object PTF12dam. The extensive data set, from 30 d before peak to 230 d after, allows a detailed and quantitative comparison with published models of PISN explosions. We find that the PS1-11ap data do not match these model explosion parameters well, supporting the recent claim that these SNe are not pair instability explosions. We show that PS1-11ap has many features in common with the faster declining SLSNe-Ic, and the light-curve evolution can also be quantitatively explained by the magnetar spin-down model. At a redshift of z = 0.524, the observer-frame optical coverage provides comprehensive rest-frame UV data and allows us to compare it with the SLSNe recently found at high redshifts between z = 2 and 4. While these high-z explosions are still plausible PISN candidates, they match the photometric evolution of PS1-11ap and hence could be counterparts to this lower redshift transient.
McCrum, M., Smartt, S., Kotak, R., Rest, A., Jerkstrand, A., Inserra, C., …Wainscoat, R. (2014). The superluminous supernova PS1-11ap: bridging the gap between low and high redshift. Monthly Notices of the Royal Astronomical Society, 437(1), 656-674. https://doi.org/10.1093/mnras/stt1923
|Journal Article Type||Article|
|Publication Date||Jan 1, 2014|
|Deposit Date||Apr 3, 2014|
|Publicly Available Date||Jun 19, 2014|
|Journal||Monthly Notices of the Royal Astronomical Society|
|Publisher||Royal Astronomical Society|
|Peer Reviewed||Peer Reviewed|
|Keywords||Supernovae: general, Supernovae: individual: PS1-11ap|
Published Journal Article
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society © 2014 The Authors Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved.
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