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

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The distance and redshift of a type Ia supernova can bedetermined simultaneously through its multi-band light curves. This factmay beused for imaging surveys that discover and obtain photometry forlarge numbers of supernovae; so many that it would be difficult to obtaina spectroscopic redshift for each. Using available supernova-analysistools we find that there are several conditions in which a viabledistance--redshift can be determined. Uncertainties in the effectivedistance at z~;0.3 are dominated by redshift uncertainties coupled withthe steepness of the Hubble law. By z~;0.5 the Hubble law flattens outand distance-modulus uncertainties dominate. Observations that giveS/N=50 at peak brightness and a four-day observer ... continued below

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Kim, Alex G. & Miquel, Ramon August 12, 2007.

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The distance and redshift of a type Ia supernova can bedetermined simultaneously through its multi-band light curves. This factmay beused for imaging surveys that discover and obtain photometry forlarge numbers of supernovae; so many that it would be difficult to obtaina spectroscopic redshift for each. Using available supernova-analysistools we find that there are several conditions in which a viabledistance--redshift can be determined. Uncertainties in the effectivedistance at z~;0.3 are dominated by redshift uncertainties coupled withthe steepness of the Hubble law. By z~;0.5 the Hubble law flattens outand distance-modulus uncertainties dominate. Observations that giveS/N=50 at peak brightness and a four-day observer cadence in each ofgriz-bands are necessary to match the intrinsic supernova magnitudedispersion out to z=1.0. Lower S/N can be tolerated with the addition ofredshift priors (e.g., from a host-galaxy photometric redshift),observationsin an additional redder band, or by focusing on supernovaredshifts that have particular leverage for this measurement. Morestringent S/N requirements are anticipated as improved systematicscontrol over intrinsic color, metallicity, and dust is attempted to bedrawn from light curves.

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  • Journal Name: Astroparticle Physics; Journal Volume: 28; Journal Issue: 4-5; Related Information: Journal Publication Date: 2007

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  • Report No.: LBNL--63328
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 923299
  • Archival Resource Key: ark:/67531/metadc897709

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  • August 12, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Oct. 31, 2016, 4:12 p.m.

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Kim, Alex G. & Miquel, Ramon. Measuring Type Ia Supernova Distances and Redshifts From TheirMulti-band Light Curves, article, August 12, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc897709/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.