Kavli Affiliate: Wendy L. Freedman
| First 5 Authors: Syed A. Uddin, Christopher R. Burns, Mark M. Phillips, Nicholas B. Suntzeff, Wendy L. Freedman
| Summary:
We present an analysis of Type Ia Supernovae (SNe~Ia) from both the Carnegie
Supernova Project~I (CSP-I) and II (CSP-II), and extend the Hubble diagram from
the optical to the near-infrared wavelengths ($uBgVriYJH$). We calculate the
Hubble constant, $H_0$ using various distance calibrators: Cepheids, Tip of the
Red Giant Branch (TRGB), and Surface Brightness Fluctuations (SBF). Combining
all methods of calibrations, we derive $rm H_0=71.43 pm 0.62 (stat) pm
2.43 (sys) km s^{-1} Mpc^{-1}$ from $B$-band, and $rm H_0=72.65 pm
0.63 (stat) pm 2.88 (sys) km s^{-1} Mpc^{-1}$ from $H$-band. By
assigning equal weight to the Cepheid, TRGB, and SBF calibrators, we derive the
systematic errors required for consistency in the first rung of the distance
ladder, resulting in an increased systematic error in $H_0$. As a result, the
tension between the late-time $H_0$ we derive by combining the various distance
calibrators and the early-time $H_0$ from the Cosmic Microwave Background is
reduced. The highest precision in SN~Ia luminosity is found in the $Y$ band
($0.12pm0.01$ mag), as defined by the intrinsic scatter ($sigma_{int}$). We
revisit SN~Ia Hubble residual-host mass correlations and recover previous
results that these correlations do not change significantly between the optical
and the near-infrared wavelengths. Finally, SNe~Ia that explode beyond 10 kpc
from their host centers exhibit smaller dispersion in their luminosity,
confirming our earlier findings. Reduced effect of dust in the outskirt of
hosts may be responsible for this effect.
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