The Hubble Constant from Blue Type Ia Supernovae

Abstract There is a persistent tension of about 5 σ –6 σ between the value of the Hubble constant, as derived from the local distance ladder versus the cosmic microwave background, signaling either unaccounted for systematics in the measurements or “new physics,” such as early dark energy. Determining the Hubble constant using Type Ia supernovae requires nontrivial and accurate corrections for dust extinction. To circumvent this obstacle, we here determine the Hubble constant from blue, and hence presumably unextinguished, supernovae. For two different sets of Type Ia supernova data and lightcurve fitting methods, we find that when using blue supernovae only, the derived Hubble constant is consistently lower…

• VF
  Villum Fonden

  Awards: VIL54489, 16599, 54489, VIL16599, VIL69896, 25501, 69896