%0 Generic %1 mortsell2021hubble %A Mortsell, Edvard %A Goobar, Ariel %A Johansson, Joel %A Dhawan, Suhail %D 2021 %K tifr %T The Hubble Tension Bites the Dust: Sensitivity of the Hubble Constant Determination to Cepheid Color Calibration %U http://arxiv.org/abs/2105.11461 %X Motivated by the large observed diversity in the properties of extra-galactic extinction by dust, we re-analyse the Cepheid calibration used to infer the local value of the Hubble constant, $H_0$, from Type Ia supernovae. Unlike the SH0ES team, we do not enforce a universal color-luminosity relation to correct the near-IR Cepheid magnitudes. Instead, we focus on a data driven method, where the measured colors of the Cepheids are used to derive a color-luminosity relation for each galaxy individually. We present two different analyses, one based on Wesenheit magnitudes, a common practice in the field that attempts to combine corrections from both extinction and variations in intrinsic colors, resulting in $H_0=66.92.5$ km/s/Mpc, in agreement with the Planck value. In the second approach, we calibrate using color excesses with respect to derived average intrinsic colors, yielding $H_0=71.81.6$ km/s/Mpc, a $2.7\,\sigma$ tension with the value inferred from the cosmic microwave background. Hence, we argue that systematic uncertainties related to the choice of Cepheid color-luminosity calibration method currently inhibits us from measuring $H_0$ to the precision required to claim a substantial tension with Planck data.

@misc{mortsell2021hubble, abstract = {Motivated by the large observed diversity in the properties of extra-galactic extinction by dust, we re-analyse the Cepheid calibration used to infer the local value of the Hubble constant, $H_0$, from Type Ia supernovae. Unlike the SH0ES team, we do not enforce a universal color-luminosity relation to correct the near-IR Cepheid magnitudes. Instead, we focus on a data driven method, where the measured colors of the Cepheids are used to derive a color-luminosity relation for each galaxy individually. We present two different analyses, one based on Wesenheit magnitudes, a common practice in the field that attempts to combine corrections from both extinction and variations in intrinsic colors, resulting in $H_0=66.9\pm 2.5$ km/s/Mpc, in agreement with the Planck value. In the second approach, we calibrate using color excesses with respect to derived average intrinsic colors, yielding $H_0=71.8\pm 1.6$ km/s/Mpc, a $2.7\,\sigma$ tension with the value inferred from the cosmic microwave background. Hence, we argue that systematic uncertainties related to the choice of Cepheid color-luminosity calibration method currently inhibits us from measuring $H_0$ to the precision required to claim a substantial tension with Planck data.}, added-at = {2021-05-26T07:55:39.000+0200}, author = {Mortsell, Edvard and Goobar, Ariel and Johansson, Joel and Dhawan, Suhail}, biburl = {https://www.bibsonomy.org/bibtex/2384f471c27e285007f82edce7342194e/citekhatri}, description = {The Hubble Tension Bites the Dust: Sensitivity of the Hubble Constant Determination to Cepheid Color Calibration}, interhash = {a5c6b0def986f769dd660e3fe690421a}, intrahash = {384f471c27e285007f82edce7342194e}, keywords = {tifr}, note = {cite arxiv:2105.11461Comment: 13 pages, 12 figures}, timestamp = {2021-05-26T07:55:39.000+0200}, title = {The Hubble Tension Bites the Dust: Sensitivity of the Hubble Constant Determination to Cepheid Color Calibration}, url = {http://arxiv.org/abs/2105.11461}, year = 2021 }