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

Journal Article · · The Astrophysical Journal (Online)
ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [3]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Astronomy; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Computational Cosmology Center
  2. Univ. of California, Berkeley, CA (United States). Dept. of Astronomy; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division; Univ. of California, Berkeley, CA (United States). Dept. of Physics
  3. Univ. of Portsmouth (United Kingdom). Inst. of Cosmology and Gravitation

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. Lastly, 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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1457001
Journal Information:
The Astrophysical Journal (Online), Vol. 855, Issue 1; Related Information: © 2018. The American Astronomical Society. All rights reserved.; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 62 works
Citation information provided by
Web of Science

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Strong gravitational lensing of explosive transients journal November 2019
Magnified or multiply imaged? – Search strategies for gravitationally lensed supernovae in wide-field surveys journal June 2019
Observing Cosmological Processes in Real Time with Repeating Fast Radio Bursts journal October 2018
LSST: From Science Drivers to Reference Design and Anticipated Data Products journal March 2019
Turning Gravitationally Lensed Supernovae into Cosmological Probes journal May 2019
Cosmological Distance Indicators book January 2018
LSST: from Science Drivers to Reference Design and Anticipated Data Products text January 2008
Limits on stellar-mass compact objects as dark matter from gravitational lensing of type Ia supernovae text January 2017
Impact of the 3D source geometry on time-delay measurements of lensed type-Ia Supernovae text January 2018
A Hubble constant measurement from superluminal motion of the jet in GW170817 preprint January 2018
Observing Cosmological Processes in Real Time with Repeating Fast Radio Bursts text January 2018
Strong gravitational lensing of explosive transients text January 2019

Figures / Tables (13)