The superluminous supernova PS1-11ap: bridging the gap between low and high redshift
Data(s) |
06/01/2014
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Resumo |
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. |
Formato |
application/pdf |
Identificador | |
Idioma(s) |
eng |
Direitos |
info:eu-repo/semantics/openAccess |
Fonte |
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 2014 , ' The superluminous supernova PS1-11ap: bridging the gap between low and high redshift ' Monthly Notices of the Royal Astronomical Society , vol 437 , no. 1 , pp. 656-674 . DOI: 10.1093/mnras/stt1923 |
Tipo |
article |