Measuring Type Ia Supernova Distances and Redshifts From Their Multi-band Light Curves

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dc.creatorKim, Alex G.
dc.creatorMiquel, Ramon
dc.date2007-08-21
dc.date.accessioned2026-07-07T10:57:12Z
dc.date.available2026-07-07T10:57:12Z
dc.descriptionThe distance and redshift of a type Ia supernova can be determined simultaneously through its multi-band light curves. This fact may be used for imaging surveys that discover and obtain photometry for large numbers of supernovae; so many that it would be difficult to obtain a spectroscopic redshift for each. Using available supernova-analysis tools we find that there are several conditions in which a viable distance-redshift can be determined. Uncertainties in the effective distance at z~0.3 are dominated by redshift uncertainties coupled with the steepness of the Hubble law. By z~0.5 the Hubble law flattens out and distance-modulus uncertainties dominate. Observations that give S/N=50 at peak brightness and a four-day observer cadence in each of griz-bands are necessary to match the intrinsic supernova magnitude dispersion out to z=1.0. Lower S/N can be tolerated with the addition of redshift priors (e.g. from a host-galaxy photometric redshift), observations in an additional redder band, or by focusing on supernova redshifts that have particular leverage for this measurement. More stringent S/N requirements are anticipated as improved systematics control over intrinsic color, metallicity, and dust is attempted to be drawn from light curves.
dc.description16 pages, 4 figures, Astroparticle Physics, accepted
dc.identifierhttps://arxiv.org/abs/0708.2745
dc.identifierhttp://arxiv.org/abs/0708.2745
dc.identifierAstropart.Phys.28:448-455,2007
dc.identifierdoi:10.1016/j.astropartphys.2007.08.009
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/186669
dc.subjectAstrophysics
dc.titleMeasuring Type Ia Supernova Distances and Redshifts From Their Multi-band Light Curves
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