HOLISMOKES XIX: SN 2025wny at $z=2$, the first strongly lensed superluminous supernova
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| Format: | Preprint |
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2025
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| author | Taubenberger, Stefan Acebron, Ana Cañameras, Raoul Chen, Ting-Wan Galan, Aymeric Grillo, Claudio Melo, Alejandra Schuldt, Stefan Schweinfurth, Allan G. Suyu, Sherry H. Aldering, Greg Aryan, Amar Lee, Yu-Hsing Mamuzic, Elias Millon, Martin Reynolds, Thomas M. Sergeyev, Alexey V. Asfandiyarov, Ildar M. Basa, Stéphane Blondin, Stéphane Burkhonov, Otabek A. Christensen, Lise Courbin, Frederic Ehgamberdiev, Shuhrat A. Killestein, Tom L. Mattila, Seppo Shaymanov, Asadulla M. Shu, Yiping Xu, Dong Yang, Sheng Gruen, Daniel Pierel, Justin D. R. Storfer, Christopher J. Tran, Kim-Vy Wong, Kenneth C. Becerra, Rosa L. Dornic, Damien Ducoin, Jean-Grégoire Globus, Noémie Gutiérrez, Claudia P. Jiang, Ji-an Kuncarayakti, Hanindyo López-Cámara, Diego Lundqvist, Peter Magnani, Francesco Méndez, Enrique Moreno Schneider, Benjamin Vogl, Christian |
| author_facet | Taubenberger, Stefan Acebron, Ana Cañameras, Raoul Chen, Ting-Wan Galan, Aymeric Grillo, Claudio Melo, Alejandra Schuldt, Stefan Schweinfurth, Allan G. Suyu, Sherry H. Aldering, Greg Aryan, Amar Lee, Yu-Hsing Mamuzic, Elias Millon, Martin Reynolds, Thomas M. Sergeyev, Alexey V. Asfandiyarov, Ildar M. Basa, Stéphane Blondin, Stéphane Burkhonov, Otabek A. Christensen, Lise Courbin, Frederic Ehgamberdiev, Shuhrat A. Killestein, Tom L. Mattila, Seppo Shaymanov, Asadulla M. Shu, Yiping Xu, Dong Yang, Sheng Gruen, Daniel Pierel, Justin D. R. Storfer, Christopher J. Tran, Kim-Vy Wong, Kenneth C. Becerra, Rosa L. Dornic, Damien Ducoin, Jean-Grégoire Globus, Noémie Gutiérrez, Claudia P. Jiang, Ji-an Kuncarayakti, Hanindyo López-Cámara, Diego Lundqvist, Peter Magnani, Francesco Méndez, Enrique Moreno Schneider, Benjamin Vogl, Christian |
| contents | We present imaging and spectroscopic observations of supernova SN 2025wny, associated with the lens candidate PS1 J0716+3821. Photometric monitoring from the Lulin and Maidanak observatories confirms multiple point-like images, consistent with SN 2025wny being strongly lensed by two foreground galaxies. Optical spectroscopy of the brightest image with the Nordic Optical Telescope and the University of Hawaii 88-inch Telescope allows us to determine the redshift to be z_s = 2.008 +- 0.001, based on narrow absorption lines originating in the interstellar medium of the supernova host galaxy. At this redshift, the spectra of SN 2025wny are consistent with those of superluminous supernovae of Type I. We find a high ejecta temperature and depressed spectral lines compared to other similar objects. We also measure, for the first time, the redshift of the fainter of the two lens galaxies (the "perturber") to be z_p = 0.375 +- 0.001, fully consistent with the DESI spectroscopic redshift of the main deflector at z_d = 0.3754. SN 2025wny thus represents the first confirmed galaxy-scale strongly lensed supernova with time delays likely in the range of days to weeks, as judged from the image separations. This makes SN 2025wny suitable for cosmography, offering a promising new system for independent measurements of the Hubble constant. Following a tradition in the field of strongly-lensed SNe, we give SN 2025wny the nickname SN Winny. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_21694 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | HOLISMOKES XIX: SN 2025wny at $z=2$, the first strongly lensed superluminous supernova Taubenberger, Stefan Acebron, Ana Cañameras, Raoul Chen, Ting-Wan Galan, Aymeric Grillo, Claudio Melo, Alejandra Schuldt, Stefan Schweinfurth, Allan G. Suyu, Sherry H. Aldering, Greg Aryan, Amar Lee, Yu-Hsing Mamuzic, Elias Millon, Martin Reynolds, Thomas M. Sergeyev, Alexey V. Asfandiyarov, Ildar M. Basa, Stéphane Blondin, Stéphane Burkhonov, Otabek A. Christensen, Lise Courbin, Frederic Ehgamberdiev, Shuhrat A. Killestein, Tom L. Mattila, Seppo Shaymanov, Asadulla M. Shu, Yiping Xu, Dong Yang, Sheng Gruen, Daniel Pierel, Justin D. R. Storfer, Christopher J. Tran, Kim-Vy Wong, Kenneth C. Becerra, Rosa L. Dornic, Damien Ducoin, Jean-Grégoire Globus, Noémie Gutiérrez, Claudia P. Jiang, Ji-an Kuncarayakti, Hanindyo López-Cámara, Diego Lundqvist, Peter Magnani, Francesco Méndez, Enrique Moreno Schneider, Benjamin Vogl, Christian Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena Solar and Stellar Astrophysics We present imaging and spectroscopic observations of supernova SN 2025wny, associated with the lens candidate PS1 J0716+3821. Photometric monitoring from the Lulin and Maidanak observatories confirms multiple point-like images, consistent with SN 2025wny being strongly lensed by two foreground galaxies. Optical spectroscopy of the brightest image with the Nordic Optical Telescope and the University of Hawaii 88-inch Telescope allows us to determine the redshift to be z_s = 2.008 +- 0.001, based on narrow absorption lines originating in the interstellar medium of the supernova host galaxy. At this redshift, the spectra of SN 2025wny are consistent with those of superluminous supernovae of Type I. We find a high ejecta temperature and depressed spectral lines compared to other similar objects. We also measure, for the first time, the redshift of the fainter of the two lens galaxies (the "perturber") to be z_p = 0.375 +- 0.001, fully consistent with the DESI spectroscopic redshift of the main deflector at z_d = 0.3754. SN 2025wny thus represents the first confirmed galaxy-scale strongly lensed supernova with time delays likely in the range of days to weeks, as judged from the image separations. This makes SN 2025wny suitable for cosmography, offering a promising new system for independent measurements of the Hubble constant. Following a tradition in the field of strongly-lensed SNe, we give SN 2025wny the nickname SN Winny. |
| title | HOLISMOKES XIX: SN 2025wny at $z=2$, the first strongly lensed superluminous supernova |
| topic | Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2510.21694 |