Lensed Type Ia Supernova “Encore” at z = 2: The First Instance of Two Multiply Imaged Supernovae in the Same Host Galaxy
Open accessAbstract
A bright ( m F150W,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 ( H 0 ) 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.
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MACSJ0138 is the first known lens system to host multiple strongly-lensed supernovae.
“making this the first known lens system to host multiple strongly-lensed SNe.”
From Constraint on dark matter self-interaction from combined strong lensing and stellar kinematics in MACS J0138-2155 (2026) · cites this paper as [32]
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O’Donnell, J. H., Jeltema, T. E., Roberts, M. G., Nightingale, J., Flowers, A., & Aldas, D. (2026) · Physical Review D · doi:10.1103/hfgd-245k · Cited by 5 · see citing works
- Authors
- Pierel, J. D. R., Newman, A. B., Dhawan, S., Gu, M., Joshi, B. A., Li, T., Schuldt, S., Strolger, L. G., Suyu, S. H., Caminha, G. B., Cohen, S. H., Diego, J. M., DŚilva, J. C. J., Ertl, S., Frye, B. L., Granata, G., Grillo, C., Koekemoer, A. M., Li, J., Robotham, A., Summers, J., Treu, T., Windhorst, R. A., Zitrin, A., Agarwal, S., Agrawal, A., Arendse, N., Belli, S., Burns, C., Cañameras, R., Chakrabarti, S., Chen, W., Collett, T. E., Coulter, D. A., Ellis, R. S., Engesser, M., Foo, N., Fox, O. D., Gall, C., Garuda, N., Gezari, S., Gomez, S., Glazebrook, K., Hjorth, J., Huang, X., Jha, S. W., Kamieneski, P. S., Kelly, P., Larison, C., Moustakas, L. A., Pascale, M., Pérez-Fournon, I., Petrushevska, T., Poidevin, F., Rest, A., Shahbandeh, M., Shajib, A. J., Siebert, M., Storfer, C., Talbot, M., Wang, Q., Wevers, T., & Zenati, Y.
- Affiliations
- Space Telescope Science Institute (US)
- Carnegie Institution for Science (US)
- University of Cambridge (GB)
- University of Hong Kong (HK)
- Johns Hopkins University (US)
- University of Portsmouth (GB)
- University of Milan (IT)
- Institute of Astronomy and Astrophysics, Academia Sinica (TW)
- Max Planck Institute for Astrophysics (DE)
- Arizona State University (US)
- Consejo Superior de Investigaciones Científicas (ES)
- University of Arizona (US)
- The University of Western Australia (AU)
- University of California, Los Angeles (US)
- Ben-Gurion University of the Negev (IL)
- University of California, Berkeley (US)
- University of Illinois Urbana-Champaign (US)
- Stockholm University (SE)
- University of Bologna (IT)
- University of Alabama (US)
- Oklahoma State University (US)
- University College London (GB)
- University of Copenhagen (DK)
- Swinburne University of Technology (AU)
- University of Chicago (US)
- Rutgers, The State University of New Jersey (US)
- University of Minnesota (US)
- Jet Propulsion Laboratory (US)
- Universidad de La Laguna (ES)
- University of Nova Gorica (SI)
- University of Hawaiʻi at Mānoa (US)
- Corresponding author
- Pierel, J. D. R.
- ORCID
- Pierel, J. D. R.
- Newman, A. B.
- Dhawan, S.
- Gu, M.
- Joshi, B. A.
- Li, T.
- Schuldt, S.
- Strolger, L. G.
- Suyu, S. H.
- Caminha, G. B.
- Cohen, S. H.
- Diego, J. M.
- DŚilva, J. C. J.
- Ertl, S.
- Frye, B. L.
- Granata, G.
- Grillo, C.
- Koekemoer, A. M.
- Li, J.
- Robotham, A.
- Summers, J.
- Treu, T.
- Windhorst, R. A.
- Zitrin, A.
- Agarwal, S.
- Agrawal, A.
- Arendse, N.
- Belli, S.
- Burns, C.
- Cañameras, R.
- Chakrabarti, S.
- Chen, W.
- Collett, T. E.
- Coulter, D. A.
- Ellis, R. S.
- Engesser, M.
- Foo, N.
- Fox, O. D.
- Gall, C.
- Garuda, N.
- Gezari, S.
- Gomez, S.
- Glazebrook, K.
- Hjorth, J.
- Huang, X.
- Jha, S. W.
- Kamieneski, P. S.
- Kelly, P.
- Larison, C.
- Moustakas, L. A.
- Pascale, M.
- Pérez-Fournon, I.
- Petrushevska, T.
- Poidevin, F.
- Rest, A.
- Shahbandeh, M.
- Shajib, A. J.
- Siebert, M.
- Storfer, C.
- Talbot, M.
- Wang, Q.
- Wevers, T.
- Zenati, Y.
- Venue
- The Astrophysical Journal Letters
- Publisher
- American Astronomical Society
- Published
- 2024-05-29
- Volume
- 967
- Issue
- 2
- Pages
- L37
- ISSN
- 2041-8205 (ISSN-L)
- 2041-8213
- OpenAlex
- W4399140417
- Cited by
- 56
- References
- 4
- Citations by year
- 2026: 18 · 2025: 24 · 2024: 14
- FWCI
- 10.48
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- The Astrophysical Journal Letters (publishedVersion, cc-by)
- University of Birmingham Research Portal (University of Birmingham) (publishedVersion, cc-by)
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- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- UWA Profiles and Research Repository (UWA) (submittedVersion, cc-by)
- arXiv (Cornell University)
- Funders
- National Aeronautics and Space Administration (HF2-51541.001, HF2-51492, NAG5-12460, NNX14AN10G, 80NSSC18K020)
- EC ∣ European Research Council (771776, 01076080)
- Deutsche Forschungsgemeinschaft (390783311)
- Ministerio de Ciencia, Innovación y Universidades (PID2019-110614GB-C21)
- Department of Education and Training ∣ Australian Research Council (FL180100060)
- EC ∣ ERC ∣ HORIZON EUROPE European Research Council (101105167, 945536)
- Villum Fonden (25501)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Gamma-ray bursts and supernovae
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
- Keywords
- Type Ia supernovae, gravitational lensing, lensed supernovae, supernova host galaxies, time-delay cosmography, JWST NIRCam, supernova discovery
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