JWST Photometric Time-delay and Magnification Measurements for the Triply Imaged Type Ia “SN H0pe” at z = 1.78

J. D.R. Pierel, B. L. Frye, M. Pascale, G. B. Caminha, W. Chen, S. Dhawan, D. Gilman, M. Grayling, S. Huber, P. Kelly, S. Thorp, N. Arendse, S. Birrer, M. Bronikowski, R. Cañameras, D. Coe, S. H. Cohen, C. J. Conselice, S. P. Driver, J. C.J. DŚilvaM. Engesser, N. Foo, C. Gall, N. Garuda, C. Grillo, N. A. Grogin, J. Henderson, J. Hjorth, R. A. Jansen, J. Johansson, P. S. Kamieneski, A. M. Koekemoer, C. Larison, M. A. Marshall, L. A. Moustakas, M. Nonino, R. Ortiz, T. Petrushevska, N. Pirzkal, A. Robotham, R. E. Ryan, S. Schuldt, L. G. Strolger, J. Summers, S. H. Suyu, T. Treu, C. N.A. Willmer, R. A. Windhorst, H. Yan, A. Zitrin, A. Acebron, S. Chakrabarti, D. A. Coulter, O. D. Fox, X. Huang, S. W. Jha, G. Li, P. A. Mazzali, A. K. Meena, I. Pérez-Fournon, F. Poidevin, A. Rest, A. G. Riess

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2 Citations (Scopus)


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.

Original languageEnglish
Article number50
Number of pages14
JournalAstrophysical Journal
Issue number1
Publication statusPublished - 16 May 2024


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