The DEHVILS in the Details: Type Ia Supernova Hubble Residual Comparisons and Mass Step Analysis in the Near-Infrared
arxiv(2024)
摘要
Measurements of Type Ia Supernovae (SNe Ia) in the near-infrared (NIR) have
been used both as an alternate path to cosmology compared to optical
measurements and as a method of constraining key systematics for the larger
optical studies. With the DEHVILS sample, the largest published NIR sample with
consistent NIR coverage of maximum light across three NIR bands (Y, J, and
H), we check three key systematics: (i) the reduction in Hubble residual
scatter as compared to the optical, (ii) the measurement of a "mass step" or
lack thereof and its implications, and (iii) the ability to distinguish between
various dust models by analyzing correlations between Hubble residuals in the
NIR and optical. We produce accurate simulations of the DEHVILS sample and
find, contrary to assumptions in the literature, it is harder to
differentiate between various dust models than previously understood.
Additionally, we find that fitting with the current SALT3 model does not yield
accurate wavelength-dependent stretch-luminosity correlations, and we propose a
limited solution for this problem. From the data, we see that (i) the standard
deviation of Hubble residual values from NIR bands treated as standard candles
are 0.007-0.042 mag smaller than those in the optical, (ii) the NIR mass step
is not constrainable with the current sample size from DEHVILS, and (iii)
Hubble residuals in the NIR and optical are correlated in both the simulations
and the data. We test a few variations on the number and combinations of
filters and data samples, and we observe that none of our findings or
conclusions are significantly impacted by these modifications.
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