Prajakta Mane
Final year, Integrated BS-MS,
Indian Institute of Science Education and Research (IISER) Mohali, India
LSST TDWG Meeting
Anupreeta More, Surhud More
Inter-University Centre for Astronomy and Astrophysics (IUCAA), India
March 26, 2024
Time delay cosmography:
accurate time delays, surface mass distribution and redshift of lens
Hubble constant with strong lensing time delays
well-constrained Hubble Constant!
Hubble constant constraints from 6 lensed quasars, Wong et al., 2019
Time delay cosmography:
accurate time delays, surface mass distribution and redshift of lens
Hubble constant with strong lensing time delays
well-constrained Hubble Constant
What makes SNeIa a better source for TDC?
well-studied light curves -> more accurate time delay measurements
transient source -> improved constraints on the lens galaxy model
standard candle nature -> help overcome degeneracies
How to find lensed SNeIa?
DIA: run LSST Stack's difference imaging pipeline to identify multiply imaged SNe
CMA: study outliers in the colour-magnitude space for transients to identify lensed SNeIa
SNe light curve simulations
Sky data for DIA
Difference imaging analysis
Preliminary results
Difference imaging analysis
Preliminary results
Injected | Detected | % recovery | |
---|---|---|---|
Total | 74k | 51.5k | 70 |
Doubles | 70k | 48.3k | 70 |
Quads | 4.1k | 3.2k | 78 |
g | 310 | 260 | 83 |
r | 5.4k | 4.7k | 86 |
i | 14k | 11k | 80 |
z | 21k | 16k | 76 |
y | 34k | 20k | 58 |
Difference imaging analysis
Preliminary results
Recovery fraction variation with injected unresolved magnitude
Recovery fraction variation with maximum injected angular separation
Color-magnitude analysis
Quimby et al. 2014
: Unlensed SNIa
: Unlensed core collapse
: Lensed SNIa
: Lensed core collapse
The redder supernovae for given i-band magnitude are more likely to be lensed SNeIa
High redshift: 1.64 < z < 2.4
CM diagram for simulated SNeIa
The black bold curve separates the lensed SNeIa from unlensed both on the rising and the falling edge of light curve for z < 2.4!
Low redshift: z < 1.64
Comparison with observed SNeIa
The criteria hold well for the observed unlensed and lensed SNeIa!
Contamination from SNcc (Simulated)
Unlensed
Lensed
Not too much! Lensed Ib and Ic are majority of contaminants
Summary of current results
Ongoing work
Time delay cosmography:
accurate time delays, surface mass distribution and redshift of lens
Hubble constant with strong lensing time delays
well-constrained Hubble Constant
What makes SNeIa a better source for TDC?
well-studied light curves -> more accurate time delay measurements
transient source -> improved constraints on the lens galaxy model
standard candle nature -> help overcome degeneracies
Current lensed supernova sample
SNIa
SNIa
better constraints expected
Time delay cosmography:
accurate time delays, surface mass distribution and redshift of lens
Hubble constant with strong lensing time delays
well-constrained Hubble Constant
What makes SNeIa a better source for TDC?
well-studied light curves -> more accurate time delay measurements
transient source -> improved constraints on the lens galaxy model
standard candle nature -> help overcome degeneracies
How to find lensed SNeIa?
DIA: run LSST Stack's difference imaging pipeline to identify multiply imaged SNe
CMA: study outliers in the colour-magnitude space for transients to identify lensed SNeIa
better constraints expected
Current lensed supernova sample
SNIa
SNIa