SN Ia Standardization on the Rise: Evidence for the Cosmological Importance of Pre-maximum Measurements

Hayden, B.; Rubin, D.; Strovink, M.

doi:10.3847/1538-4357/aaf232

Title: SN Ia Standardization on the Rise: Evidence for the Cosmological Importance of Pre-maximum Measurements

Journal Article · 01 February 2019 · The Astrophysical Journal (Online)

DOI: https://doi.org/10.3847/1538-4357/aaf232 · OSTI ID:1544078

^[1];

^[2]; Strovink, M. ^[3]

Univ. of California, Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Space Telescope Science Inst., Baltimore, MD (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

We introduce SALT2X, an extension of the SALT2 model for SN Ia light curves. SALT2X separates the light-curve-shape parameter x 1 into an $${x}_{1}^{r}$$ and $${x}_{1}^{f}$$ for the rise and fall portions of the light curve. Using the Joint Lightcurve Analysis SN sample, we analyze the importance of the rising and falling portions of the light curve for cosmological standardization using a modified version of the Unified Nonlinear Inference for Type Ia cosmologY (UNITY) framework. We find strong evidence that $${x}_{1}^{r}$$ has a stronger correlation with peak magnitude than $${x}_{1}^{f}$$. We observe evidence that standardizing on the rise affects the color standardization relation, and reduces the size of the host-galaxy standardization and the unexplained ("intrinsic") luminosity dispersion. Since SNe Ia typically rise more quickly than they decline, a faster observing cadence in future surveys will be necessary to maximize the gain from this work and to continue to explore the impacts of decoupling the rising and falling portions of SN Ia light curves.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1544078

Journal Information:: The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 2 Vol. 871; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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