668 transients classified by PESSTO so far
132 transients are being followed by PESSTO

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A new method for measuring nickel masses in type Ia supernova

Mike Childress has submitted a paper analysing 94 nebular spectra of type Ia supernovae in the most extensive study to date of cobalt emission lines. Type Ia supernovae are powered by the radioactive decay of 56-Ni to 56-Co during their early phases. After about 60 days the decay of 56-Co to stable 56-Fe powers their luminosity. Mike’s paper shows that the initial mass of 56-Ni can be determined from the flux in the cobalt 5892 Angstrom line (a forbidden transition of Co III). This is po ...

A surprising new discovery for superluminous supernovae

We have made a surprising discovery of a double-parked light curve of a super-luminous supernova. The dense daily cadence of the La Silla QUEST survey produced a beautifully sampled lightcurve of LSQ14bdq, which was classified as a superluminous SN by PESSTO on 2014 March 22 at a redshift z=0.345. Matt Nicholl spotted the excess flux in the LSQ images when studying the LSQ data for early lightcurve. Matt’s paper (published in ApJ letters) proposes this “bump” is post-shock cooling after breakout of the SN shock from the stellar surface. However ...

a few of the most recent PESSTO papers ...

SN 2013ej in M74: A Luminous and Fast-declining Type II-P Supernova  Huang, Fang; Wang, Xiaofeng; Zhang, Jujia et al.
Measuring nickel masses in Type Ia supernovae using cobalt emission in nebular phase spectra  Childress, Michael J.; Hillier, D. John; Seitenzahl, Ivo et al.
LSQ14bdq: A Type Ic Super-luminous Supernova with a Double-peaked Light Curve  Nicholl, M.; Smartt, S. J.; Jerkstrand, A. et al.
Bright but slow - Type II supernovae from OGLE-IV - implications for magnitude-limited surveys  Poznanski, D.; Kostrzewa-Rutkowska, Z.; Wyrzykowski, L. et al.