The impact of microlensing on the standardization of strongly lensed Type Ia supernovae

Foxley-Marrable, Max; Collett, Thomas E.; Vernardos, G.; Goldstein, D.; Bacon, David

doi:10.1093/mnras/sty1346

Cited by 65 publications

(79 citation statements)

References 37 publications

(56 reference statements)

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“…There are many ways in which our methodology might be improved. First of all, in the framework of the Chabrier IMF, 90% lensed SNe Ia can be classified as standard candles and insignificantly suffer less from the microlensing effects (Foxley-Marrable et al 2018), which makes it possible to get more precise measurements of the cosmic opacity from future observations of strongly lensed SNe Ia. Secondly, we may expect more vigorous and convincing constraints on the cosmic opacity within the coming years with more precise data.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…Firstly, due to exceptionally well-characterized spectral sequences and considerable variation in light curve morphology (Nugent et al 2002;Pereira et al 2013), the time delay between each image can be precisely measured from the time-domain information observed by dedicated monitoring campaigns. More interestingly, SLSNe Ia time delays can be obtained in a single observing season, since the light curves have a strong peak before they decay, occurring over a timescale of several weeks (Foxley-Marrable et al 2018). In the framework of a typical SNe Ia-elliptical galaxy lensing systems, the fractional uncertainty of ∆t is expected to be determined at the level of 1%, which is supported by the recent analysis by the strong lens time delay challenge (TDC) (Liao et al 2015b;Dobler et al 2015).…”

Section: Simulated Data Of Lensed and Unlensed Sne Iamentioning

confidence: 99%

“…More progress has been made to discuss this important issue (Goldstein & Nugent 2017), which indicated that the absolute time delay error due to microlensing is unbiased at the sub-percent level. Following the quantitative analysis made by Foxley-Marrable et al (2018), in the framework of the Salpeter IMF, only 22% of the 650 SLSNe Ia discovered by LSST will be standardisable due to the microlensing effects. Lensed images are standardisable in regions of low convergence, shear and stellar density (especially the outer image of an asymmetric double for lenses with large θ E ).…”

Section: Simulated Data Of Lensed and Unlensed Sne Iamentioning

confidence: 99%

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Testing Cosmic Opacity with the Combination of Strongly Lensed and Unlensed Supernova Ia

Ma¹,

Cao²,

Zhang³

et al. 2019

ApJ

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In this paper, we present a scheme to investigate the opacity of the Universe in a cosmological-modelindependent way, with the combination of current and future measurements of type Ia supernova sample and galactic-scale strong gravitational lensing systems with SNe Ia acting as background sources. The observational data include the current newly-compiled SNe Ia data (Pantheon sample) and simulated sample of SNe Ia observed by the forthcoming Large Synoptic Survey Telescope (LSST) survey, which are taken for luminosity distances (D L ) possibly affected by the cosmic opacity, as well as strongly lensed SNe Ia observed by the LSST, which are responsible for providing the observed time-delay distance (D ∆t ) unaffected by the cosmic opacity. Two parameterizations, τ (z) = 2βz and τ (z) = (1 + z) 2β − 1 are adopted for the optical depth associated to the cosmic absorption. Focusing on only one specific type of standard cosmological probe, this provides an original method to measure cosmic opacity at high precision. Working on the simulated sample of strongly lensed SNe Ia observed by the LSST in 10 year z-band search, our results show that, with the combination of the current newly-compiled SNe Ia data (Pantheon sample), there is no significant deviation from the transparency of the Universe at the current observational data level. Moreover, strongly lensed SNe Ia in a 10 year LSST z-band search would produce more robust constraints on the validity of cosmic transparency (at the precision of ∆β = 10 −2 ), with a larger sample of unlensed SNe Ia detected in future LSST survey. We have also discussed the ways in which our methodology could be improved, with the combination of current and future available data in gravitational wave (GW) and electromagnetic (EM) domain. Therefore, the proposed method will allow not only to check the foundations of observational cosmology (a transparent universe), but also open the way to identify completely new physics (non-standard physics).

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Section: Conclusion and Discussionmentioning

confidence: 99%

Section: Simulated Data Of Lensed and Unlensed Sne Iamentioning

confidence: 99%

Section: Simulated Data Of Lensed and Unlensed Sne Iamentioning

confidence: 99%

See 1 more Smart Citation

Testing Cosmic Opacity with the Combination of Strongly Lensed and Unlensed Supernova Ia

Ma¹,

Cao²,

Zhang³

et al. 2019

ApJ

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show abstract

“…Inversely, we can use strong lensing of Type Ia supernovae to calibrate their absolute magnitudes [260]. Again, an obstacle is microlensing which can change the total magnification of each lens system considerably in some cases [246,261]. Similarly, the standard siren nature of gravitational waves can add useful information to the time delay cosmography.…”

Section: Time Delay Cosmographymentioning

confidence: 99%

Strong gravitational lensing of explosive transients

2019

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Recent rapid progress in time domain surveys makes it possible to detect various types of explosive transients in the Universe in large numbers, some of which will be gravitationally lensed into multiple images. Although a large number of strongly lensed distant galaxies and quasars have already been discovered, strong lensing of explosive transients opens up new applications, including improved measurements of cosmological parameters, powerful probes of small scale structure of the Universe, and new observational tests of dark matter scenarios, thanks to their rapidly evolving light curves as well as their compact sizes. In particular, the compactness of these transient events indicates that the wave optics effect plays an important role in some cases, which can lead to totally new applications of these lensing events. Recently we have witnessed first discoveries of strongly lensed supernovae, and strong lensing events of other types of explosive transients such as gamma-ray bursts, fast radio bursts, and gravitational waves from compact binary mergers are expected to be observed soon. In this review article, we summarize the current state of research on strong gravitational lensing of explosive transients and discuss future prospects.

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“…The system is a SNe Ia at redshift 0.409 and strongly lensed by an intervening galaxy at a redshift of 0.216. Strong lens mass models of the system from More et al (2017) yield SN image fluxes that are discrepant with the observations, which might be partly an effect of microlensing (Yahalomi et al 2017;Foxley-Marrable et al 2018;. Additionally, Mörtsell et al (2019) show that the flux anomalies are within stellar microlensing predictions for certain values of the slope of the projected surface density of the lens galaxy.…”

Section: Introductionmentioning

confidence: 96%

Strongly lensed SNe Ia in the era of LSST: observing cadence for lens discoveries and time-delay measurements

Huber

Suyu

Noebauer

et al. 2019

A&A

110

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The upcoming Large Synoptic Survey Telescope (LSST) will detect many strongly lensed Type Ia supernovae (LSNe Ia) for timedelay cosmography. This will provide an independent and direct way for measuring the Hubble constant H 0 , which is necessary to address the current 4.4σ tension in H 0 between the local distance ladder and the early Universe measurements. We present a detailed analysis of different observing strategies (also referred to as cadence strategy) for the LSST, and quantify their impact on time-delay measurement between multiple images of LSNe Ia. For this, we simulated observations by using mock LSNe Ia for which we produced mock-LSST light curves that account for microlensing. Furthermore, we used the free-knot splines estimator from the software PyCS to measure the time delay from the simulated observations. We find that using only LSST data for time-delay cosmography is not ideal. Instead, we advocate using LSST as a discovery machine for LSNe Ia, enabling time delay measurements from follow-up observations from other instruments in order to increase the number of systems by a factor of 2 to 16 depending on the observing strategy. Furthermore, we find that LSST observing strategies, which provide a good sampling frequency (the mean inter-night gap is around two days) and high cumulative season length (ten seasons with a season length of around 170 days per season), are favored. Rolling cadences subdivide the survey and focus on different parts in different years; these observing strategies trade the number of seasons for better sampling frequency. In our investigation, this leads to half the number of systems in comparison to the best observing strategy. Therefore rolling cadences are disfavored because the gain from the increased sampling frequency cannot compensate for the shortened cumulative season length. We anticipate that the sample of lensed SNe Ia from our preferred LSST cadence strategies with rapid follow-up observations would yield an independent percent-level constraint on H 0 .

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The impact of microlensing on the standardization of strongly lensed Type Ia supernovae

Cited by 65 publications

References 37 publications

Testing Cosmic Opacity with the Combination of Strongly Lensed and Unlensed Supernova Ia

Testing Cosmic Opacity with the Combination of Strongly Lensed and Unlensed Supernova Ia

Strong gravitational lensing of explosive transients

Strongly lensed SNe Ia in the era of LSST: observing cadence for lens discoveries and time-delay measurements

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