ZTF SN Ia DR2: Improved SN Ia colors through expanded dimensionality with SALT3+

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Table 2.

Tripp nuisance parameters and maximum likelihood, compared between SALT3+ and SALT3.K21.

Name	ℒ	M₀	α₁	α₂	β	$σ_{int}^{nonZTF}$ $\sigma_{\mathrm{int}}^{\mathrm{nonZTF}}$	$σ_{int}^{ZTF}$ $\sigma_{\mathrm{int}}^{\mathrm{ZTF}}$	γ
Full sample, SALT3	427.63	−19.471(0.005)	0.145(0.005)	−	2.72(0.05)	0.082(0.007)	0.140(0.007)	0.07(0.01)
Full sample, SALT3+	461.85	−19.413(0.005)	0.111(0.005)	−0.019(0.005)	2.94(0.05)	0.088(0.006)	0.135(0.006)	0.07(0.01)

Non-ZTF, SALT3	289.21	−19.450(0.006)	0.143(0.007)	−	2.74(0.07)	0.078(0.007)	−	0.04(0.01)
Non-ZTF, SALT3+	292.22	−19.385(0.006)	0.107(0.007)	−0.034(0.007)	2.91(0.08)	0.082(0.006)	−	0.04(0.01)

ZTF only, SALT3	167.98	−19.511(0.008)	0.156(0.008)	−	2.89(0.06)	−	0.128(0.007)	0.12(0.02)
ZTF only, SALT3+	214.26	−19.457(0.007)	0.121(0.007)	−0.009(0.006)	3.20(0.07)	−	0.118(0.006)	0.11(0.02)

Notes. Parameters are shown as fitted using either the full sample, only ZTF data, or only non-ZTF data. Definitions of the nuisance parameters are given in Equation (6). The full sample here includes 1161 SNe, of which 643 are ZTF objects and 518 are from other surveys.

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