Comment on the recent claims of H0 measurements with the ZTF DR2 SN Ia sample (arXiv:2610.36051)
Abstract
Karchev et al. (2026) derived a value of H0 by combining the ZTF SN Ia DR2 sample with SH0ES calibrator Type Ia supernovae (SNe Ia; Riess et al. 2022), used to anchor the SN Ia absolute luminosity. The ZTF SN Ia DR2 dataset (Rigault et al., 2025) is the largest (O(3000)) SN Ia sample to date obtained with a single telescope. However, as emphasized in the data release, the absolute photometric calibration of the survey has not yet been established to the precision required for cosmological inference. The relative photometric zeropoint offset between the SH0ES and ZTF SN Ia DR2 samples, which is fully degenerate with H0, is therefore unknown and cannot be determined from publicly available data. The photometric corrections introduced in Karchev et al. (2026) do not address this global calibration offset. Consequently, their reported H0 determination is not supported by the available calibration information. We nonetheless share the excitement of pursuing state-of-the-art cosmology with ZTF and are actively working toward the release of a fully calibrated dataset
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BibTeX
@misc{rigault2026comment,
title = {{Comment on the recent claims of H0 measurements with the ZTF DR2 SN Ia sample (arXiv:2610.36051)}},
author = {Mickael Rigault and Brodie Popovic and Ariel Goobar and Suhail Dhawan and Marie Aubert and Marc Betoule and Umut Burgaz and Georgios Dimitriadis and Lluís Galbany and Tomás E. Müller Bravo and Antoine Gilles Lordet and Madeleine Ginolin and Young-Lo Kim and Marek Kowalski and Jakob Nordin and Nicolas Regnault and Mathew Smith and Jesper Sollerman and Jacco H. Terwel and Alice Townsend},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.07794},
eprint = {2611.07794},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.07794},
}
RIS
TY - UNPB
TI - Comment on the recent claims of H0 measurements with the ZTF DR2 SN Ia sample (arXiv:2610.36051)
AU - Mickael Rigault
AU - Brodie Popovic
AU - Ariel Goobar
AU - Suhail Dhawan
AU - Marie Aubert
AU - Marc Betoule
AU - Umut Burgaz
AU - Georgios Dimitriadis
AU - Lluís Galbany
AU - Tomás E. Müller Bravo
AU - Antoine Gilles Lordet
AU - Madeleine Ginolin
AU - Young-Lo Kim
AU - Marek Kowalski
AU - Jakob Nordin
AU - Nicolas Regnault
AU - Mathew Smith
AU - Jesper Sollerman
AU - Jacco H. Terwel
AU - Alice Townsend
PY - 2026
DA - 2026/11/05
PB - arXiv
DO - 10.48550/arxiv.2611.07794
UR - https://arxiv.org/abs/2611.07794
AB - Karchev et al. (2026) derived a value of H0 by combining the ZTF SN Ia DR2 sample with SH0ES calibrator Type Ia supernovae (SNe Ia; Riess et al. 2022), used to anchor the SN Ia absolute luminosity. The ZTF SN Ia DR2 dataset (Rigault et al., 2025) is the largest (O(3000)) SN Ia sample to date obtained with a single telescope. However, as emphasized in the data release, the absolute photometric calibration of the survey has not yet been established to the precision required for cosmological inference. The relative photometric zeropoint offset between the SH0ES and ZTF SN Ia DR2 samples, which is fully degenerate with H0, is therefore unknown and cannot be determined from publicly available data. The photometric corrections introduced in Karchev et al. (2026) do not address this global calibration offset. Consequently, their reported H0 determination is not supported by the available calibration information. We nonetheless share the excitement of pursuing state-of-the-art cosmology with ZTF and are actively working toward the release of a fully calibrated dataset
ER -