Abstract
Supernova (SN) SN H0pe is a gravitationally lensed, triply imaged, Type Ia SN (SN Ia) discovered in James Webb Space Telescope imaging of the PLCK G165.7+67.0 cluster of galaxies. Well-observed multiply imaged SNe provide a rare opportunity to constrain the Hubble constant (H
0), by measuring the relative time delay between the images and modeling the foreground mass distribution. SN H0pe is located at z = 1.783 and is the first SN Ia with sufficient light-curve sampling and long enough time delays for an H
0 inference. Here we present photometric time-delay measurements and SN properties of SN H0pe. Using JWST/NIRCam photometry, we measure time delays of Δt
ab =
−
116.6
−
9.3
+
10.8
observer-frame days and Δt
cb =
−
48.6
−
4.0
+
3.6
observer-frame days relative to the last image to arrive (image 2b; all uncertainties are 1σ), which corresponds to a ∼5.6% uncertainty contribution for H
0 assuming 70 km s−1 Mpc−1. We also constrain the absolute magnification of each image to μ
a
=
4.3
−
1.8
+
1.6
, μ
b
=
7.6
−
2.6
+
3.6
, μ
c
=
6.4
−
1.5
+
1.6
by comparing the observed peak near-IR magnitude of SN H0pe to the nonlensed population of SNe Ia.</jats:p
