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A BayeSN distance ladder: H0 from a consistent modelling of Type Ia supernovae from the optical to the near-infrared
Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Stockholm University, Faculty of Science, Department of Physics. University of Cambridge, UK.ORCID iD: 0009-0005-6323-0457
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Number of Authors: 72023 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 524, no 1, p. 235-244, article id stad1590Article in journal (Refereed) Published
Abstract [en]

The local distance ladder estimate of the Hubble constant (H-0) is important in cosmology, given the recent tension with the early universe inference. We estimate H-0 from the Type Ia supernova (SN Ia) distance ladder, inferring SN Ia distances with the hierarchical Bayesian SED model, BayeSN. This method has a notable advantage of being able to continuously model the optical and near-infrared (NIR) SN Ia light curves simultaneously. We use two independent distance indicators, Cepheids or the tip of the red giant branch (TRGB), to calibrate a Hubble-flow sample of 67 SNe Ia with optical and NIR data. We estimate H-0 = 74.82 +/- 0.97 (stat) +/- 0.84 (sys) km s(-1) Mpc(-1) when using the calibration with Cepheid distances to 37 host galaxies of 41 SNe Ia, and 70.92 +/- 1.14 (stat) +/- 1.49 (sys) km s(-1) Mpc(-1) when using the calibration with TRGB distances to 15 host galaxies of 18 SNe Ia. For both methods, we find a low intrinsic scatter sigma(int) less than or similar to 0.1 mag. We test various selection criteria and do not find significant shifts in the estimate of H-0. Simultaneous modelling of the optical and NIR yields up to similar to 15 per cent reduction in H-0 uncertainty compared to the equivalent optical-only cases. With improvements expected in other rungs of the distance ladder, leveraging joint optical-NIR SN Ia data can be critical to reducing the H-0 error budget.

Place, publisher, year, edition, pages
2023. Vol. 524, no 1, p. 235-244, article id stad1590
Keywords [en]
supernovae: general, cosmological parameters, distance scale
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-221080DOI: 10.1093/mnras/stad1590ISI: 001023651100018Scopus ID: 2-s2.0-85165456412OAI: oai:DiVA.org:su-221080DiVA, id: diva2:1798088
Available from: 2023-09-18 Created: 2023-09-18 Last updated: 2023-09-18Bibliographically approved

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Thorp, Stephen

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Thorp, StephenJha, Saurabh W.
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The Oskar Klein Centre for Cosmo Particle Physics (OKC)Department of Physics
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