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Lensed Type Ia Supernova "Encore" at z=2: The First Instance of Two Multiply Imaged Supernovae in the Same Host Galaxy
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
Number of Authors: 632024 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 967, no 2, article id L37Article in journal (Refereed) Published
Abstract [en]

A bright (mF150W,AB = 24 mag), z = 1.95 supernova (SN) candidate was discovered in JWST/NIRCam imaging acquired on 2023 November 17. The SN is quintuply imaged as a result of strong gravitational lensing by a foreground galaxy cluster, detected in three locations, and remarkably is the second lensed SN found in the same host galaxy. The previous lensed SN was called "Requiem," and therefore the new SN is named "Encore." This makes the MACS J0138.0−2155 cluster the first known system to produce more than one multiply imaged SN. Moreover, both SN Requiem and SN Encore are Type Ia SNe (SNe Ia), making this the most distant case of a galaxy hosting two SNe Ia. Using parametric host fitting, we determine the probability of detecting two SNe Ia in this host galaxy over a ∼10 yr window to be ≈3%. These observations have the potential to yield a Hubble constant (H0) measurement with ∼10% precision, only the third lensed SN capable of such a result, using the three visible images of the SN. Both SN Requiem and SN Encore have a fourth image that is expected to appear within a few years of ∼2030, providing an unprecedented baseline for time-delay cosmography.

Place, publisher, year, edition, pages
2024. Vol. 967, no 2, article id L37
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Astronomy, Astrophysics and Cosmology
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URN: urn:nbn:se:su:diva-231543DOI: 10.3847/2041-8213/ad4648ISI: 001234776400001Scopus ID: 2-s2.0-85195099247OAI: oai:DiVA.org:su-231543DiVA, id: diva2:1885116
Available from: 2024-07-22 Created: 2024-07-22 Last updated: 2024-07-22Bibliographically approved

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Arendse, Nikki

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