A Uniform Type Ia Supernova Distance Ladder with the Zwicky Transient Facility:Absolute Calibration Based on the Tip of the Red Giant Branch Method

Dhawan, Suhail and Goobar, Ariel and Johansson, Joel and Jang, In Sung and Rigault, Mickael and Harvey, Luke and Maguire, Kate and Freedman, Wendy L. and Madore, Barry F. and Smith, Mathew and Sollerman, Jesper and Kim, Young-Lo and Andreoni, Igor and Bellm, Eric C. and Coughlin, Michael W. and Dekany, Richard and Graham, Matthew J. and Kulkarni, Shrinivas R. and Laher, Russ R. and Medford, Michael S. and Neill, James D. and Nir, Guy and Riddle, Reed and Rusholme, Ben (2022) A Uniform Type Ia Supernova Distance Ladder with the Zwicky Transient Facility:Absolute Calibration Based on the Tip of the Red Giant Branch Method. The Astrophysical Journal, 934 (2). ISSN 0004-637X

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Abstract

The current Cepheid-calibrated distance ladder measurement of H 0 is reported to be in tension with the values inferred from the cosmic microwave background (CMB), assuming standard cosmology. However, some tip of the red giant branch (TRGB) estimates report H 0 in better agreement with the CMB. Hence, it is critical to reduce systematic uncertainties in local measurements to understand the Hubble tension. In this paper, we propose a uniform distance ladder between the second and third rungs, combining Type Ia supernovae (SNe Ia) observed by the Zwicky Transient Facility (ZTF) with a TRGB calibration of their absolute luminosity. A large, volume-limited sample of both calibrator and Hubble flow SNe Ia from the same survey minimizes two of the largest sources of systematics: host-galaxy bias and nonuniform photometric calibration. We present results from a pilot study using the existing TRGB distance to the host galaxy of ZTF SN Ia SN 2021rhu (aka ZTF21abiuvdk) in NGC7814. Combining the ZTF calibrator with a volume-limited sample from the first data release of ZTF Hubble flow SNe Ia, we infer H 0 = 76.94 ± 6.4 km s−1 Mpc−1, an 8.3% measurement. The error budget is dominated by the single object calibrating the SN Ia luminosity in this pilot study. However, the ZTF sample includes already five other SNe Ia within ∼20 Mpc for which TRGB distances can be obtained with the Hubble Space Telescope. Finally, we present the prospects of building this distance ladder out to 80 Mpc with James Webb Space Telescope observations of more than 100 ZTF SNe Ia.

Item Type:
Journal Article
Journal or Publication Title:
The Astrophysical Journal
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900/1912
Subjects:
ID Code:
174317
Deposited By:
Deposited On:
08 Aug 2022 09:25
Refereed?:
Yes
Published?:
Published
Last Modified:
09 Aug 2022 02:30