paper

A 5% measurement of the Hubble constant from Type II supernovae

arXiv:2203.08974 · doi:10.1093/mnras/stac1661

Abstract

The most stringent local measurement of the Hubble-Lemaître constant from Cepheid-calibrated Type Ia supernovae (SNe~Ia) differs from the value inferred via the cosmic microwave background radiation ({\it Planck}CDM) by . This so-called "Hubble tension" has been confirmed by other independent methods, and thus does not appear to be a possible consequence of systematic errors. Here, we continue upon our prior work of using Type II supernovae to provide another, largely-independent method to measure the Hubble-Lemaître constant. From 13 SNe~II with geometric, Cepheid, or tip of the red giant branch (TRGB) host-galaxy distance measurements, we derive H\,km\,s\,Mpc (statistical errors only), consistent with the local measurement but in disagreement by with the {\it Planck}CDM value. Using only Cepheids (), we find H\,km\,s\,Mpc, while using only TRGB (), we derive H\,km\,s\,Mpc. Via 13 variants of our dataset, we derive a systematic uncertainty estimate of 1.5\,km\,s\,Mpc. The median value derived from these variants differs by just 0.3\,km\,s\,Mpc from that produced by our fiducial model. Because we only replace SNe~Ia with SNe~II -- and we do not find statistically significant difference between the Cepheid and TRGB H measurements -- our work reveals no indication that SNe~Ia or Cepheids could be the sources of the "H tension." We caution, however, that our conclusions rest upon a modest calibrator sample; as this sample grows in the future, our results should be verified.

10 pages, 4 figures, 2 tables. Accepted for publication by MNRAS. arXiv admin note: text overlap with arXiv:2006.03412

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