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Sökning: (WFRF:(Wright MJ)) pers:(Medland SE) > The Pantheon+ analy...

The Pantheon+ analysis : supercal-fragilistic cross calibration, retrained SALT2 light-curve model, and calibration systematic uncertainty

Brout, Dillon (författare)
Center for Astrophysics, Harvard & Smithsonian, MA, Cambridge, United States
Taylor, Georgie (författare)
Research School of Astronomy and Astrophysics, Australian National University, Canberra, Australia
Scolnic, Dan (författare)
Department of Physics, Duke University, NC, Durham, United States
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Wood, Charlotte M. (författare)
Department of Physics, University of Notre Dame, IN, Notre Dame, United States
Rose, Benjamin M. (författare)
Department of Physics, Duke University, NC, Durham, United States
Vincenzi, Maria (författare)
Department of Physics, Duke University, NC, Durham, United States
Dwomoh, Arianna (författare)
Department of Physics, Duke University, NC, Durham, United States
Lidman, Christopher (författare)
The Research School of Astronomy and Astrophysics, Australian National University, ACT, Australia; Centre for Gravitational Astrophysics, College of Science, Australian National University, ACT, Australia
Riess, Adam (författare)
Department of Physics and Astronomy, Johns Hopkins University, MD, Baltimore, United States
Ali, Noor (författare)
Umeå universitet,Institutionen för fysik
Qu, Helen (författare)
Department of Physics and Astronomy, University of Pennsylvania, PA, Philadelphia, United States
Dai, Mi (författare)
Department of Physics and Astronomy, Johns Hopkins University, MD, Baltimore, United States
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 (creator_code:org_t)
2022-10-19
2022
Engelska.
Ingår i: Astrophysical Journal. - : Institute of Physics (IOP). - 0004-637X .- 1538-4357. ; 938:2
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • We present a recalibration of the photometric systems in the Pantheon+ sample of Type Ia supernovae (SNe Ia) including those in the SH0ES distance-ladder measurement of H0. We utilize the large and uniform sky coverage of the public Pan-STARRS stellar photometry catalog to cross calibrate against tertiary standards released by individual SN Ia surveys. The most significant updates over the “SuperCal” cross calibration used for the previous Pantheon and SH0ES analyses are: (1) expansion of the number of photometric systems (now 25) and filters (now 105), (2) solving for all filter offsets in all systems simultaneously to produce a calibration uncertainty covariance matrix for cosmological-model constraints, and (3) accounting for the change in the fundamental flux calibration of the Hubble Space Telescope CALSPEC standards from previous versions on the order of 1.5% over a Δλ of 4000 Å. We retrain the SALT2 model and find that our new model coupled with the new calibration of the light curves themselves causes a net distance modulus change (dμ/dz) of 0.04 mag over the redshift range 0 < z < 1. We introduce a new formalism to determine the systematic impact on cosmological inference by propagating the covariance in the fitted calibration offsets through retraining simultaneously with light-curve fitting and find a total calibration uncertainty impact of σw = 0.013; roughly half the size of the sample statistical uncertainty. Similarly, we find the systematic SN calibration contribution to the SH0ES H0 uncertainty is less than 0.2 km s−1 Mpc−1, suggesting that SN Ia calibration cannot resolve the current level of the “Hubble Tension.”

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

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