Cited by 96Gamma-ray bursts and supernovaeCosmology and Gravitation TheoriesAstrophysical Phenomena and Observations

Precise Time Delays from Strongly Gravitationally Lensed Type Ia Supernovae with Chromatically Microlensed Images

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Goldstein, Daniel A., Nugent, Peter E., Kasen, Daniel N., Collett, Thomas E.·2018·The Astrophysical Journal

Abstract

Time delays between the multiple images of strongly gravitationally lensed Type Ia supernovae (glSNe Ia) have the potential to deliver precise cosmological constraints, but the effects of microlensing on time delay extraction have not been studied in detail. Here we quantify the effect of microlensing on the glSN Ia yield of the Large Synoptic Survey Telescope (LSST) and the effect of microlensing on the precision and accuracy of time delays that can be extracted from LSST glSNe Ia. Microlensing has a negligible effect on the LSST glSN Ia yield, but it can be increased by a factor of ∼2 over previous predictions to 930 systems using a novel photometric identification technique based on spectral template fitting. Crucially, the microlensing of glSNe Ia is achromatic until three rest-frame weeks after the explosion, making the early-time color curves microlensing-insensitive time delay indicators. By fitting simulated flux and color observations of microlensed glSNe Ia with their underlying, unlensed spectral templates, we forecast the distribution of absolute time delay error due to microlensing for LSST, which is unbiased at the sub-percent level and peaked at 1% for color curve observations in the achromatic phase, while for light-curve observations it is comparable to state-of-the-art mass modeling uncertainties (4%). About 70% of LSST glSN Ia images should be discovered during the achromatic phase, indicating that microlensing time delay uncertainties can be minimized if prompt multicolor follow-up observations are obtained. Accounting for microlensing, the 1–2 day time delay on the recently discovered glSN Ia iPTF16geu can be measured to 40% precision, limiting its cosmological utility.

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  • LSST will discover between 500 and 1000 strongly lensed SNe Ia, providing hundreds of additional high-quality time delays.

    “LSST will also discover between 500 and 1000 strongly lensed SNe Ia ( Goldstein & Nugent 2017; Goldstein et al. 2018 ) , which will provide hundreds of additional high-quality time delays.”

    From LSST: From Science Drivers to Reference Design and Anticipated Data Products (2019) · cites this paper as Goldstein et al. 2018

  • LSST is expected to discover 500 to 1000 multiply imaged Type Ia supernovae.

    “500 -1000 multiply imaged SNe Ia ( Goldstein & Nugent 2017; Goldstein et al. 2018 )”

    From LSST: From Science Drivers to Reference Design and Anticipated Data Products (2019) · cites this paper as Goldstein et al. 2018

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Research works printed but not linked: 2

  1. Tie, S. S., & Kochanek, C. S. 2017, ArXiv e-prints, arXiv:1707.01908 · arXiv
  2. Wambsganss, J. 1990, PhD thesis, Thesis Ludwig-Maximilians-Univ., Munich (Germany, F. R.). Fakultät für Physik., (1990) -. 1999, Journal of Computational and Applied Mathematics, 109, 353

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Authors
Goldstein, D. A., Nugent, P. E., Kasen, D. N., & Collett, T. E.
Affiliations
  • Lawrence Berkeley National Laboratory (US)
  • University of Portsmouth (GB)
Venue
The Astrophysical Journal
Published
2018-03-01
Volume
855
Issue
1
Pages
22
ISSN
  • 0004-637X (ISSN-L)
  • 1538-4357
OpenAlex
W2786423804
Cited by
96
References
77
Citations by year
2026: 8 · 2025: 6 · 2024: 12 · 2023: 6 · 2022: 9 · 2021: 11 · 2020: 8 · 2019: 19 · 2018: 13 · 2017: 1 · 2016: 3
FWCI
6.83
Type
journal article
Language
en
Open access
Locations
  • The Astrophysical Journal (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • U.S. Department of Energy (-AC02-05CH11231, 05CH11231, DE AC02 05CH11231, DE-AC02-)
  • National Aeronautics and Space Administration (DE-AC02-05CH11231)
  • Gordon and Betty Moore Foundation (GBMF5076)
  • Strong
  • Office of Science (DEAC02–05CH11231, AC02-05CH11231, DE-AC02, 05CH11231)
  • Nuclear Physics (DE-SC0018297, DEAC02-05CH11231)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Gamma-ray bursts and supernovae
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
Keywords
time delay, strong gravitational lensing, Type Ia supernovae, gravitational microlensing, LSST, cosmological constraints

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