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The Perfect Host: JWST Cepheid Observations in a Background-free Type Ia Supernova Host Confirm No Bias in Hubble-constant Measurements

  • Authors: Adam G. Riess, Siyang Li, Gagandeep S. Anand, Wenlong Yuan, Louise Breuval, Stefano Casertano, Lucas M. Macri, Dan Scolnic, Yukei S. Murakami, Alexei V. Filippenko, Thomas G. Brink

Adam G. Riess et al 2025 The Astrophysical Journal Letters 992 .

  • Provider: AAS Journals

Caption: Figure 6.

A larger sample of Cepheids in NGC 3447A, the tidal companion, illustrating the absence of a contaminating background. The general appearance is similar to that of an MW open cluster. As discussed in Section 3.2, the rare superposition of a blue star with a Cepheid would suppress the latter’s amplitude more strongly in the optical (where their light curves are measured) than in the infrared and eliminate such an object from the amplitude selection.

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