Abstract
We present the HOLISMOKES programme on strong gravitational lensing of supernovae (SNe) as a probe of SN physics and cosmology. We investigate the effects of microlensing on early-phase SN Ia spectra using four different SN explosion models. We find that distortions of SN Ia spectra due to microlensing are typically negligible within ten rest-frame days after a SN explosion (< 1% distortion within the 1σspread and ≲10% distortion within the 2σspread). This shows the great prospects of using lensed SNe Ia to obtain intrinsic early-phase SN spectra for deciphering SN Ia progenitors. As a demonstration of the usefulness of lensed SNe Ia for cosmology, we simulate a sample of mock lensed SN Ia systems that are expected to have accurate and precise time-delay measurements in the era of theRubinObservatory Legacy Survey of Space and Time (LSST). Adopting realistic yet conservative uncertainties on their time-delay distances and lens angular diameter distances, of 6.6% and 5%, respectively, we find that a sample of 20 lensed SNe Ia would allow us to constrain the Hubble constant (H0) with 1.3% uncertainty in the flat ΛCDM cosmology. We find a similar constraint onH0in an open ΛCDM cosmology, while the constraint degrades to 3% in a flatwCDM cosmology. We anticipate lensed SNe to be an independent and powerful probe of SN physics and cosmology in the upcoming LSST era.
Highlights
In the past few years, strongly lensed supernovae (SNe) have transformed from a theoretical fantasy to reality
We present the HOLISMOKES programme on strong gravitational lensing of supernovae (SNe) as a probe of SN physics and cosmology
Adopting realistic yet conservative uncertainties on their time-delay distances and lens angular diameter distances, of 6.6% and 5%, respectively, we find that a sample of 20 lensed SNe Ia would allow us to constrain the Hubble constant (H0) with 1.3% uncertainty in the flat Λ cold dark matter (ΛCDM) cosmology
Summary
In the past few years, strongly lensed supernovae (SNe) have transformed from a theoretical fantasy to reality. We are exploring in more detail the microlensing of lensed SNe Ia (Huber et al 2020, HOLISMOKES III) and core-collapse SNe (Bayer et al in prep., HOLISMOKES V) for measuring the time delays, following the works of Goldstein et al (2018) and Huber et al (2019) In this first paper of the HOLISMOKES series, we study and forecast our ability to achieve two scientific goals with a sample of lenses from the upcoming LSST: constrain SN Ia progenitors through early-phase observations, and probe cosmology through lensing time delays.
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