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JWST Photometric Time-delay and Magnification Measurements for the Triply Imaged Type Ia SN H0pe at z=1.78
Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0009-0005-6323-0457
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0001-5409-6480
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0001-5975-290x
Number of Authors: 632024 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 967, no 1, article id 50Article in journal (Refereed) Published
Abstract [en]

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 Delta t(ab) = -116.6(-9.3)(+10.8) observer-frame days and Delta t(cb) = -48.6(-4.0)(+3.6) observer-frame days relative to the last image to arrive (image 2b; all uncertainties are 1 sigma), which corresponds to a similar to 5.6% uncertainty contribution for H-0 assuming 70 km s(-1) Mpc(-1). We also constrain the absolute magnification of each image to mu(a) = 4.3(-1.8)(+1.6), mu(b) = 7.6(-2.6)(+3.6), mu(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.

Place, publisher, year, edition, pages
2024. Vol. 967, no 1, article id 50
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Astronomy, Astrophysics and Cosmology
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URN: urn:nbn:se:su:diva-231542DOI: 10.3847/1538-4357/ad3c43ISI: 001224715100001Scopus ID: 2-s2.0-85193689084OAI: oai:DiVA.org:su-231542DiVA, id: diva2:1885121
Available from: 2024-07-22 Created: 2024-07-22 Last updated: 2024-07-22Bibliographically approved

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Thorp, StephenArendse, NikkiPearson Johansson, Joel

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