Bright but slow – Type II
supernovae from OGLE-IV &
magnitude limited surveys
Paper by: D. Poznanski, Z. Kostrzewa-Rutkowska, L.
Wyrzykowski & N. Blagorodnova
Talk by: John McCann
OGLE-IV
• OGLE – Optical Gravitational Lensing Experiment,
Phase four
• Las Camapanas Observatory in Chile
• Started in 1992 concern with detecting dark matter
• Current phase uses a 32 chip mosaic CCD camera
Source:
http://ogle.astrouw.edu.pl/cont/7_photogall
ery/gallery_lco.php
Supernovae Type II
• Type II – Hydrogen in the spectrum
• Type II-P – light curve “plateaus”
• Type II-L – light curve decreases “linearly”
Source:
https://en.wikipedia.org/wiki/Type_II_superno
mediaviewer/File:SNIIcurva.png
Eleven Type II
supernovae
discovered by
OGLE-IV survey
Absolute magnitude light curves of the OGLE
sample
Normalized light curves of supernovae
Magnitude vs. Plateau Duration
Black dots – Faran et al. (2014a)
Blue & Green crosses – OGLE
Velocity vs. Plateau Duration
Black dots – Faran et al. (2014a)
Blue & Green crosses – OGLE
Red dots – Numerical models Dessart et. Al (2010)
Velocity vs. Magnitude
Conclusion
• Analyzing the OGLE data set found 3 or 4 SNII-L
(~30% of the sample)
• The SNII-P mostly standard except for high
luminosity, shorter plateaus and longer rise times
• No single parameter to explain range of outcomes