The local ultraviolet signature of Type Ia supernova environments from HST and MUSE

[2606.22173] The local ultraviolet signature of Type Ia supernova environments from HST and MUSE Skip to main content Search Submit Donate Log in Astrophysics > Cosmology and Nongalactic Astrophysics arXiv:2606.22173 (astro-ph) [Submitted on 20 Jun 2026 ( v1 ), last revised 25 Aug 2026 (this version, v2)] Title: The local ultraviolet signature of Type Ia supernova environments from HST and MUSE Authors: Lluís Galbany , Cullen Abelson , Alaa Alburai , Joseph P Anderson , Yago Ascasibar , Chris Ashall , Carles Badenes , Chris Burns , Èlia Diéguez Gurnés , Albert García Soto , Claudia P. Gutiérrez , Eric Y. Hsiao , Hanindyo Kuncarayakti , Andrew J. Levan , Jospeh Lyman , Mark M. Phillips , Sebastian F. Sánchez , Ramon Sanfeliu , Maximilian Stritzinger , Danny Steeghs View PDF HTML (experimental) Abstract: The local environment of a Type Ia supernova (SN~Ia) traces the local stellar-population age (a statistical proxy for the progenitor age), star formation, dust, and chemical enrichment that may influence both its light-curve properties and its standardized luminosity. We assemble a homogeneous explosion-site dataset to test how near-ultraviolet (UV) imaging combined with optical integral-field spectroscopy improves the characterization of SN~Ia environments and their connection to SN~Ia observables. We analyze 340 low-redshift SN~Ia explosion sites observed with HST/WFC3 in F275W together with matched VLT/MUSE spectroscopy. For each site we measure local photometry and extract a 1~kpc-aperture spectrum, model the stellar continuum with STARLIGHT in a joint UV+optical fit, derive local stellar and gas-phase properties, and fit the SN light curves with sncosmo/SALT3-NIR. UV emission is detected at 235 of the 337 sites with valid HST imaging. The UV- and H$\alpha$-based star-formation-rate surface densities are strongly correlated, with the UV estimates systematically higher by about 0.5 dex. Including the UV constraint in the STARLIGHT fit shifts local luminosity-weighted ages toward older values by a median of $+0.20$ dex for UV detections and $+0.45$ dex for UV non-detections, showing that UV data help break age--dust--metallicity degeneracies and substantially alter and tighten the inferred local stellar-population ages within the adopted modelling framework. Consistently, F275W$-r$ is very strongly correlated with the joint-fit stellar age. Within the 169-SN~Ia calibration sample, the joint stellar age, the H$\alpha$ specific star-formation rate (sSFR), and the UV sSFR all correlate strongly with the SALT3 stretch parameter $x_1$, with significances above $6.8\sigma$. (abridged) Comments: 15 pages, 10 Figures. Submitted to A&A Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO) ; Astrophysics of Galaxies (astro-ph.GA); High Energy Astrophysical Phenomena (astro-ph.HE) Cite as: arXiv:2606.22173 [astro-ph.CO] (or arXiv:2606.22173v2 [astro-ph.CO] for this version) https://doi.org/10.48550/arXiv.2606.22173 Focus to learn more arXiv-issued DOI via DataCite Submission history From: Lluís Galbany [ view email ] [v1] Sat, 20 Jun 2026 18:02:30 UTC (13,588 KB) [v2] Tue, 25 Aug 2026 08:10:32 UTC (13,704 KB) Full-text links: Access Paper: View PDF HTML (experimental) TeX Source view license Current browse context: astro-ph.CO < prev | next > new | recent | 2026-06 Change to browse by: astro-ph astro-ph.GA astro-ph.HE References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar export BibTeX citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer ( What is the Explorer? ) Connected Papers Toggle Connected Papers ( What is Connected Papers? ) Litmaps Toggle Litmaps ( What is Litmaps? ) scite.ai Toggle scite Smart Citations ( What are Smart Citations? ) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv ( What is alphaXiv? ) Links to Code Toggle CatalyzeX Code Finder for Papers ( What is CatalyzeX? ) DagsHub Toggle DagsHub ( What is DagsHub? ) GotitPub Toggle Gotit.pub ( What is GotitPub? ) Huggingface Toggle Hugging Face ( What is Huggingface? ) ScienceCast Toggle ScienceCast ( What is ScienceCast? ) Demos Demos Replicate Toggle Replicate ( What is Replicate? ) Spaces Toggle Hugging Face Spaces ( What is Spaces? ) Spaces Toggle TXYZ.AI ( What is TXYZ.AI? ) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower ( What are Influence Flowers? ) Core recommender toggle CORE Recommender ( What is CORE? ) IArxiv recommender toggle IArxiv Recommender ( What is IArxiv? ) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. 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