Cosmology from Type II SupernovaePCA of type II SN light curves 116 SNe II V-band LC from A14...
Transcript of Cosmology from Type II SupernovaePCA of type II SN light curves 116 SNe II V-band LC from A14...
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Cosmology from Type II Supernovae
Mario Hamuy – Thomas de Jaeger – Lluis Galbany – Santiago GonzálezDepartamento de Astronomía – FCFM -- Universidad de Chile
Millennium Institute of Astrophysics
Future and Science of Gemini 2015, Toronto, June 16 2015
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Improvement in precision between 1998-2014 !
60 Type Ia SupernovaePerlmutter et al. 1998
Riess et al. 1998
740 Type Ia SupernovaeBetoule et al. 2014
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JLA SNe = low-z + SDSS II + SNLS + HSTBetoule et al. 2014
740 SNe:
118 low-z (Calán/Tololo; CfA, CSP)374 SDSS II (3 years, Sako et al. 2014)239 SNLS (3 years, Conley et al. 2011)9 HST (Riess et al 2007)
0.15-0.20mag
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Improvement in precision between 1998-2014 !
60 Type Ia SupernovaePerlmutter et al. 1998
Riess et al. 1998
740 Type Ia SupernovaeBetoule et al. 2014
What causes acceleration? Dark energy, P=ωε ?
Cosmological constant, P=-ε , ω = -1 ?
With increasingly larger samplessystematic errors become critical
Alternative methods?
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Type II Supernova light curves(Anderson et al. 2014)
GREAT
DIVERSITY
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Velocity Curve(Hamuy & Pinto 2002)
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Simple Approach
The luminosities of Type II
supernovae can be standardized
Luminosity-Velocity Relation(Hamuy & Pinto 2002)
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The Standardized Candle Method (SCM)(Hamuy & Pinto 2002)
0.39 mag
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The Standardized Candle Method (SCM)(Olivares et al. 2010)
0.31 mag
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Luminosity-Velocity RelationObservations match Theory!
Kasen & Woosley 2009
0.27 mag
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The Standardized Candle Method Revisited(Carnegie Supernova Program, de Jaeger et al. 2015)
� 2004-2009
� z=0.01-0.05
� Filters: ugri + BVYJHK
� Optical spectroscopy
� 54 Supernovae
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The Standardized Candle Method Revisited(Carnegie Supernova Program, de Jaeger et al. 2015)
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The Standardized Candle Method Revisited(Carnegie Supernova Program, de Jaeger et al. 2015)
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The Luminosity-Velocity Relation Revisited(Carnegie Supernova Program, Gutiérrez et al. 2015)
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The Standardized Candle Method Revisited(Carnegie Supernova Program, de Jaeger et al. 2015)
r-band
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The Standardized Candle Method Revisited(Carnegie Supernova Program, de Jaeger et al. 2015)
J-band
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The Standardized Candle Method (SCM)(Hamuy 2004)
0.38 mag
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The Standardized Candle Method (SCM)(Nugent et al. 2006)
0.26 mag
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The Standardized Candle Method (SCM)(Poznanski et al. 2009)
0.25 mag
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The Standardized Candle Method (SCM)(D´Andrea et al. 2010)
0.29 mag
redshift
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The Standardized Candle Method (SCM)(Poznanski et al. 2010)
0.25 mag
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The Standardized Candle Method (SCM)(Maguire et al. 2010)
0.15 mag
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So far so good, but what if we didn´t have spectroscopic information?
Can we come up with a method solely based on photometry?
The Photometric Candle Method (PCM)
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Type II Supernova light curves(Anderson, et al. 2014)
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time
brightness
s2
s3
Mmax
Mend
MtailPd
OPTd
s1
Trise
defined in Anderson et al. 2014
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time
brightness
s2
s1
s3
Mmax
Mend
MtailPd
OPTd
Real data:
SN 2008m
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The Photometric Candle Method(Carnegie Supernova Program, de Jaeger et al. 2015)
Anderson et al. 2014
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HUBBLE FLOW cz>3000 km s-1
The Photometric Candle Method(Carnegie Supernova Program, de Jaeger et al. 2015)
( ) ZP+cz=βCαs+m 5log2 −
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PCA of type II SN light curves
116 SNe II V-band LC from A14
Temporal reference (X reference)
Magnitude units (Y units)
Standardization
5 different options: TEXP, TMAX, TPT, TTRANS, TEND
MABS, MAPP
MXXX-MXXX,MAX, MABS-MABS,MAX + MABS,MAX MAPP-MAPP,MAX + MAPP,MAX
dMXXX, dMABS + dMABS,MAX, dMAPP + dMAPP,MAX
8 different options:
3 options: no, stddev, stddev/sqrt(N)
24 matrices per tREF120 DIFFERENT MATRICES
MW ext and time dilation correction
Normalization: mmax
Reference: Texp4 eigenvectors (templates)
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Fitted LC
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From an initial sample of 32 SNe with RMS= 0.7, we
achieved a RMS in the standardized magnitudes of 0.35
Only using a correction in one band
Further reduction is expected including a color term
PCA-standardized magnitudes
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Cosmology from Type II SupernovaeConclusions
Precision of Type Ia supernovae: 0.15 mag (7% in distance)
Precision of SCM : 0.25 mag (12% in distance)
Precision of PCM: 0.35-0.42 mag (20% in distance)
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Cosmology from Type II SupernovaeThe Next Steps
Expand the sample to high-z SNe:
Dark Energy Survey (DES) supernovae
Gemini-S + Magellan spectroscopic followup
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Cosmology from Type II Supernovae in the 2020´s
LSST � Millions of Type SNe up to z=0.6 with a cadence of 15 days� Independent route for cosmological parameters via PCM
LSST + Gemini-S � Even better route for cosmology via SCM !
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Type II SNe
2025
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