Updated 1.1% Precision Values of the Hubble Constant with Corrected Pantheon+ and Dark Energy Survey (DES)-DOVEKIE Type Ia Supernovae
Abstract
We update the Hubble constant measurement with corrected Pantheon+ and DES-DOVEKIE supernovae. The use of DES-DOVEKIE here is the first application of DES-DOVEKIE to a distance-ladder H0 determination. Recent reanalyses of supernova datasets have put Pantheon+, DES-DOVEKIE, and Union3.1 samples on the same footing with regard to the evidence of dynamical dark energy ($3.2−−3.4σ$), and thus an update on the Hubble constant is the next logical step. The H0 Distance Network (H0DN) baseline is 73.499±0.809 km s−1 Mpc−1, a 7.1σ tension with the cosmic microwave background (CMB) determination in a Λ cold-dark-matter (ΛCDM) cosmology, H0CMB,ΛCDM=67.24±0.35 km s−1 Mpc−1. A revised host-mass correction applied to the older Pantheon+ changes 114 of the total 1701 apparent-magnitude rows. The calibrator supernovae are not affected, but 52 of the 277 Hubble-flow rows are. Applying only these magnitude corrections, with the H0DN covariance, redshifts, and velocities unchanged, gives H0=73.264±0.806 km s−1 Mpc−1 and a 6.85σ Hubble tension. This is our main baseline result and the update for the astrophysics community. Alternatively, replacing the complete Hubble-flow treatment with the corrected Pantheon+ data gives 73.139±0.791 km s−1 Mpc−1 and 6.82σ. For DES-DOVEKIE, 220 supernovae span 0.025≤ zHD≤0.151 in Hubble-diagram redshift, and 196 of them overlap with corrected Pantheon+. These overlaps determine the offset used to place the public DES-DOVEKIE distance moduli on the H0DN apparent-magnitude scale. Holding this offset fixed gives H0=73.267±0.828 km s−1 Mpc−1 and a 6.70σ tension. Extending to zHD≃0.3 raises H0. However, both rises are smaller than the H0DN uncertainty. Neither update resolves the Hubble tension. (abridged)
Versions
Related
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BibTeX
@misc{choudhury2026updated,
title = {{Updated 1.1% Precision Values of the Hubble Constant with Corrected Pantheon+ and Dark Energy Survey (DES)-DOVEKIE Type Ia Supernovae}},
author = {Shouvik Roy Choudhury},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2607.24443},
eprint = {2607.24443},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.24443},
}
RIS
TY - UNPB
TI - Updated 1.1% Precision Values of the Hubble Constant with Corrected Pantheon+ and Dark Energy Survey (DES)-DOVEKIE Type Ia Supernovae
AU - Shouvik Roy Choudhury
PY - 2026
DA - 2026/09/15
PB - arXiv
DO - 10.48550/arxiv.2607.24443
UR - https://arxiv.org/abs/2607.24443
AB - We update the Hubble constant measurement with corrected Pantheon+ and DES-DOVEKIE supernovae. The use of DES-DOVEKIE here is the first application of DES-DOVEKIE to a distance-ladder H_0 determination. Recent reanalyses of supernova datasets have put Pantheon+, DES-DOVEKIE, and Union3.1 samples on the same footing with regard to the evidence of dynamical dark energy ($3.2−−3.4σ$), and thus an update on the Hubble constant is the next logical step. The H_0 Distance Network (H0DN) baseline is 73.499±0.809 km s^−1 Mpc^−1, a 7.1σ tension with the cosmic microwave background (CMB) determination in a Λ cold-dark-matter (ΛCDM) cosmology, H_0^CMB,ΛCDM=67.24±0.35 km s^−1 Mpc^−1. A revised host-mass correction applied to the older Pantheon+ changes 114 of the total 1701 apparent-magnitude rows. The calibrator supernovae are not affected, but 52 of the 277 Hubble-flow rows are. Applying only these magnitude corrections, with the H0DN covariance, redshifts, and velocities unchanged, gives H_0=73.264±0.806 km s^−1 Mpc^−1 and a 6.85σ Hubble tension. This is our main baseline result and the update for the astrophysics community. Alternatively, replacing the complete Hubble-flow treatment with the corrected Pantheon+ data gives 73.139±0.791 km s^−1 Mpc^−1 and 6.82σ. For DES-DOVEKIE, 220 supernovae span 0.025≤ z_HD≤0.151 in Hubble-diagram redshift, and 196 of them overlap with corrected Pantheon+. These overlaps determine the offset used to place the public DES-DOVEKIE distance moduli on the H0DN apparent-magnitude scale. Holding this offset fixed gives H_0=73.267±0.828 km s^−1 Mpc^−1 and a 6.70σ tension. Extending to z_HD≃0.3 raises H_0. However, both rises are smaller than the H0DN uncertainty. Neither update resolves the Hubble tension. (abridged)
ER -