Lensed Type Ia Supernova "Encore" at z=2: The First Instance of Two Multiply-Imaged Supernovae in the Same Host Galaxy
Abstract
A bright (=24 mag), 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 J0138.02155 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 year window to be . These observations have the potential to yield a Hubble Constant () measurement with 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 , providing an unprecedented baseline for time-delay cosmography.
Keywords
Cite
@article{arxiv.2404.02139,
title = {Lensed Type Ia Supernova "Encore" at z=2: The First Instance of Two Multiply-Imaged Supernovae in the Same Host Galaxy},
author = {J. D. R. Pierel and A. B. Newman and S. Dhawan and M. Gu and B. A. Joshi and T. Li and S. Schuldt and L. G. Strolger and S. H. Suyu and G. B. Caminha and S. H. Cohen and J. M. Diego and J. C. J. Dsilva and S. Ertl and B. L. Frye and G. Granata and C. Grillo and A. M. Koekemoer and J. Li and A. Robotham and J. Summers and T. Treu and R. A. Windhorst and A. Zitrin and S. Agarwal and A. Agrawal and N. Arendse and S. Belli and C. Burns and R. Cañameras and S. Chakrabarti and W. Chen and T. E. Collett and D. A. Coulter and R. S. Ellis and M. Engesser and N. Foo and O. D. Fox and C. Gall and N. Garuda and S. Gezari and S. Gomez and K. Glazebrook and J. Hjorth and X. Huang and S. W. Jha and P. S. Kamieneski and P. Kelly and C. Larison and L. A. Moustakas and M. Pascale and I. Pérez-Fournon and T. Petrushevska and F. Poidevin and A. Rest and M. Shahbandeh and A. J. Shajib and M. Siebert and C. Storfer and M. Talbot and Q. Wang and T. Wevers and Y. Zenati},
journal= {arXiv preprint arXiv:2404.02139},
year = {2024}
}
Comments
Accepted, ApJL