SALT3-NIR: Taking the open-source type Ia supernova model to longer wavelengths for next-generation cosmological measurements
SALT3-NIR: Taking the open-source type Ia supernova model to longer wavelengths for next-generation cosmological measurements
A large fraction of Type Ia supernova (SN Ia) observations over the next decade will be in the near-infrared (NIR), at wavelengths beyond the reach of the current standard light-curve model for SN Ia cosmology, SALT3 (∼2800-8700 Å central filter wavelength). To harness this new SN Ia sample and reduce future light-curve standardization systematic uncertainties, we train SALT3 at NIR wavelengths (SALT3-NIR) up to 2 μm with the open-source model-training software SALTshaker, which can easily accommodate future observations. Using simulated data, we show that the training process constrains the NIR model to ∼2%-3% across the phase range (−20 to 50 days). We find that Hubble residual (HR) scatter is smaller using the NIR alone or optical+NIR compared to optical alone, by up to ∼30% depending on filter choice (95% confidence). There is significant correlation between NIR light-curve stretch measurements and luminosity, with stretch and color corrections often improving HR scatter by up to ∼20%. For SN Ia observations expected from the Roman Space Telescope, SALT3-NIR increases the amount of usable data in the SALT framework by ∼20% at redshift z ≲ 0.4 and by ∼50% at z ≲ 0.15. The SALT3-NIR model is part of the open-source SNCosmo and SNANA SN Ia cosmology packages.
Pierel, J. D. R.
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Jones, D. O.
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Kenworthy, W. D.
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Dai, M.
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Kessler, R.
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Ashall, C.
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Do, A.
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Peterson, E. R.
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Shappee, B. J.
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Siebert, M. R.
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Barna, T.
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Brink, T. G.
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Burke, J.
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Calamida, A.
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Camacho-Neves, Y.
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Jaeger, T. de
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Filippenko, A. V.
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Foley, R. J.
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Galbany, L.
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Fox, O. D.
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Gomez, S.
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Hiramatsu, D.
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Hounsell, R.
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Howell, D. A.
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Jha, S. W.
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Kwok, L. A.
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Pérez-Fournon, I.
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Poidevin, F.
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Rest, A.
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Rubin, D.
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Scolnic, D. M.
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Shirley, R.
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Strolger, L. G.
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Tinyanont, S.
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Wang, Q.
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1 November 2022
Pierel, J. D. R.
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Jones, D. O.
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Kenworthy, W. D.
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Dai, M.
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Kessler, R.
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Ashall, C.
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Do, A.
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Peterson, E. R.
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Shappee, B. J.
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Siebert, M. R.
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Barna, T.
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Brink, T. G.
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Burke, J.
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Calamida, A.
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Camacho-Neves, Y.
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Jaeger, T. de
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Filippenko, A. V.
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Foley, R. J.
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Galbany, L.
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Fox, O. D.
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Gomez, S.
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Hiramatsu, D.
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Hounsell, R.
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Howell, D. A.
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Jha, S. W.
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Kwok, L. A.
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Pérez-Fournon, I.
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Poidevin, F.
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Rest, A.
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Rubin, D.
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Scolnic, D. M.
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Shirley, R.
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Strolger, L. G.
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Tinyanont, S.
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Wang, Q.
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