2019MNRAS.485.5329L

Query : 2019MNRAS.485.5329L

2019MNRAS.485.5329L - Mon. Not. R. Astron. Soc., 485, 5329-5344 (2019/June-1)

First cosmology results using Type IA supernovae from the dark energy survey: effects of chromatic corrections to supernova photometry on measurements of cosmological parameters.

LASKER J., KESSLER R., SCOLNIC D., BROUT D., BURKE D.L., D'ANDREA C.B., DAVIS T.M., HINTON S.R., KIM A.G., LI T.S., LIDMAN C., MACAULAY E., MOLLER A., RYKOFF E.S., SAKO M., SMITH M., SULLIVAN M., SWANN E., TUCKER B.E., WESTER W., BASSETT B.A., ABBOTT T.M.C., ALLAM S., ANNIS J., AVILA S., BECHTOL K., BERTIN E., BROOKS D., CARNERO ROSELL A., CARRASCO KIND M., CARRETERO J., CASTANDER F.J., CALCINO J., CAROLLO D., DA COSTA L.N., DAVIS C., DE VICENTE J., DIEHL H.T., DOEL P., DRLICA-WAGNER A., FLAUGHER B., FRIEMAN J., GARCIA-BELLIDO J., GAZTANAGA E., GRUEN D., GRUENDL R.A., GSCHWEND J., GUTIERREZ G., HOLLOWOOD D.L., HONSCHEID K., HOORMANN J.K., JAMES D.J., KENT S., KRAUSE E., KRON R., KUEHN K., KUROPATKIN N., LIMA M., MAIA M.A.G., MARSHALL J.L., MARTINI P., MENANTEAU F., MILLER C.J., MIQUEL R., PLAZAS A.A., SANCHEZ E., SCARPINE V., SEVILLA-NOARBE I., SMITH R.C., SOARES-SANTOS M., SOBREIRA F., SUCHYTA E., SWANSON M.E.C., TARLE G., TUCKER D.L., WALKER A.R. (The DES Collaboration)

Abstract (from CDS):

Calibration uncertainties have been the leading systematic uncertainty in recent analyses using Type Ia supernovae (SNe Ia) to measure cosmological parameters. To improve the calibration, we present the application of spectral energy distribution-dependent 'chromatic corrections' to the SN light-curve photometry from the Dark Energy Survey (DES). These corrections depend on the combined atmospheric and instrumental transmission function for each exposure, and they affect photometry at the 0.01 mag (1 per cent) level, comparable to systematic uncertainties in calibration and photometry. Fitting our combined DES and low-z SN Ia sample with baryon acoustic oscillation (BAO) and cosmic microwave background (CMB) priors for the cosmological parameters Ωm (the fraction of the critical density of the universe comprised of matter) and w (the dark energy equation of state parameter), we compare those parameters before and after applying the corrections. We find the change in w and Ωm due to not including chromatic corrections is -0.002 and 0.000, respectively, for the DES-SN3YR sample with BAO and CMB priors, consistent with a larger DES-SN3YR-like simulation, which has a w-change of 0.0005 with an uncertainty of 0.008 and an Ωm change of 0.000 with an uncertainty of 0.002. However, when considering samples on individual CCDs we find large redshift-dependent biases (∼0.02 in distance modulus) for SN distances.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): techniques: photometric - supernovae: general - dark energy - cosmology: observations

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 UCAC3 125-8171 * 03 32 32.8728703992 -27 51 48.339287532 18.74 18.0893 16.64   17.0383 ~ 40 0
2 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0V 2787 1
3 BD+17 4708 SB* 22 11 31.3756832854 +18 05 34.177983548 9.73 9.91 9.46 9.03 8.70 sdF8 580 0

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