SN 2025pht
_(weic2604a).jpg) NGC 1637 imaged by Hubble and James Webb showing SN 2025pht and its progenitor | |
| Other designations | SN 2025pht, ASASSN-25cw, ZTF25abjlnnh, BGEM J044128.86-025155.6[1] |
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| Right ascension | 04h 41m 28.93s[2] |
| Declination | −02° 51′ 56.22″[2] |
| Epoch | J2000 |
| Distance | 31.9 ± 5.9 Mly (9.8 ± 1.8 Mpc)[3] |
| Redshift | Lua error in Module:WikidataIB at line 665: attempt to index field 'wikibase' (a nil value). |
| Host | NGC 1637 |
| Progenitor | Red Supergiant |
| Peak apparent magnitude | +13.3[4] |
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| Followed by | Lua error in Module:WikidataIB at line 665: attempt to index field 'wikibase' (a nil value). |
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SN 2025pht (also known as ASASSN-25cw), is a Type II-P supernova that occurred in galaxy NGC 1637, a spiral galaxy located approximately 31.9 million light-years away in the constellation of Eridanus.[5] Discovered on 29 June 2025 by the All Sky Automated Survey for SuperNovae (ASAS-SN), It reached a peak apparent magnitude of approximately +13.3 in the g-Sloan filter and was one of the brighter supernovae observed in 2025.[4][6]
Observation
Pre-explosion imaging of the site of SN 2025pht, combined with precise astrometric alignment Hubble Space Telescope observations from 31 July 2025, identified a single credible progenitor candidate.[5] This source was detected in multiple epochs of HST imaging (including images from as early as 1994) and in JWST NIRCam and MIRI imaging from 2024, covering wavelengths from 0.8 μm to 8.7 μm.[5] It represents the first JWST detection of a supernova progenitor and the longest-wavelength detection of such a star to date.[7]
Spectral energy distribution (SED) modeling indicates the progenitor was a red supergiant (RSG) consistent with a Type II supernova progenitors.[5] The star was heavily reddened by circumstellar dust, among the highest observed for such progenitors.[5] Notably, the dust appears to be carbon-rich (graphite-rich) rather than silicate-rich, suggesting late-stage mass-loss episodes that dredged up carbon from the star's interior shortly before explosion.[5][8] The progenitor was not prominently visible in optical HST images due to this dust but was clearly detected in infrared by JWST.[7]
Comparisons have been made to other events like SN 2023ixf and SN 2004et, with SN 2025pht's progenitor. SN 2025pht was found to be potentially among the most luminous and dustiest identified[9] and SN 2025pht spectrum matches with SN 2004et Spectrum.[5]
References
- ↑ "SN 2025pht". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2026-05-11.
- ↑ 2.0 2.1 "SN 2025pht in NGC 1637 - NASA Science". 2026-02-23. Retrieved 2026-05-11.
- ↑ Crowther, Paul A. (2013-01-21). "On the association between core-collapse supernovae and H ii regions". Monthly Notices of the Royal Astronomical Society. 428 (3): 1927–1943. doi:10.1093/mnras/sts145. ISSN 1365-2966.
- ↑ 4.0 4.1 "2025pht | Transient Name Server". www.wis-tns.org. Retrieved 2026-05-11.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 Kilpatrick, Charles D.; Suresh, Aswin; Davis, Kyle W.; Drout, Maria R.; Foley, Ryan J.; Gagliano, Alexander; Jacobson-Galán, Wynn V.; Kaur, Ravjit; Taggart, Kirsty; Vazquez, Jason (2025-10-10). "The Type II SN 2025pht in NGC 1637: A Red Supergiant with Carbon-rich Circumstellar Dust as the First JWST Detection of a Supernova Progenitor Star". The Astrophysical Journal Letters. 992 (1): L10. arXiv:2508.10994. Bibcode:2025ApJ...992L..10K. doi:10.3847/2041-8213/ae04de. ISSN 2041-8205.
- ↑ "SN 2025pht and its progenitor". donhodges.com. Retrieved 2026-05-11.
- ↑ 7.0 7.1 "NASA's Webb Telescope Locates Former Star That Exploded as Supernova - NASA Science". 2026-02-23. Retrieved 2026-05-11.
- ↑ Gough, Evan (2026-02-24). "This Supernova Progenitor Hid Behind a Surprisingly Thick Veil of Carbon Dust". Universe Today. Retrieved 2026-05-11.
- ↑ Dyk, Schuyler D. Van; Szalai, Tamas; Anand, Gagandeep S.; Brink, Thomas G.; Zimmer, Noah; Milisavljevic, Dan; Fox, Ori D.; Jencson, Jacob E.; Zheng, WeiKang (2026-01-14), The Progenitor of the Type II-Plateau SN 2025pht in NGC 1637: The Dustiest, Most Luminous Red Supergiant So Far?, arXiv:2601.09087
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Category: Supernovae Category:Astronomical objects discovered in 2021
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