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BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Panel/Seminar/Colloquium
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=8a0292fd-8d13410f-018d-cc5e605b-00004257:Angelica M
 itchell\, J.D.
CREATED:20250326T143750Z
DESCRIPTION:Aims. Type Ia Supernovae (SNe Ia) are crucial tools to measure
  the accelerating expansion of the universe\, today comprising thousands 
 of SNe across multiple telescopes. Accurate measurements of cosmological 
 parameters with SNe Ia require a robust understanding and cross-calibrati
 on of the telescopes and filters. The previous best cross-calibration eff
 ort\, 'Fragilistic'\, provided cross-calibration for 25 photometric syste
 ms\, but offered no public code or ability to easily add new surveys. We 
 aim to provide an open-source\ncross-calibration solution with an eye to 
 the future\, available at https://github.com/bap37/Dovekie/ . Methods. We
  use the Pan-STARRs (PS1) and Gaia all-sky telescopes to characterise the
  measured filters from our 11 photometric\nsystems\, using published fiel
 d stars to\, for the first time\, derive uncertainties on our filter meas
 urements and modify filters to best\nmatch the data. With these filters\,
  and direct observations of a set of DA white dwarves from Boyd et al. (2
 024)\, we simultaneously\ncross-calibrate our zeropoints for each filter 
 in each photometric system\, and train a new SALT model to propagate thes
 e results to\ncosmology. \nResults. We find improvements to the calibrati
 on systematic uncertainty of ×2 for the Pantheon+ (Brout et al. 2022) sam
 ple with a new σw(phot) = 0.011\, and smaller yet still significant impro
 vements to the DES5YR calibration uncertainty. For our Pantheon+- like sa
 mple combined with constraints from Baryonic Acoustic Oscillations and th
 e microwave background radiation\, we estimate a reduction in the ΛCDM te
 nsion from previously reported 2.5σ to 2σ.
DURATION:PT1H
DTSTAMP:20250326T143750Z
DTSTART;TZID=America/New_York:20250515T140000
LAST-MODIFIED:20250326T143750Z
LOCATION;X-BEDEWORK-UID=18832edc-1c2ecfef-011c-32333fc8-00000043:Physics 2
 98
STATUS:CONFIRMED
SUMMARY:Cosmology Seminar- A Reassessment of the Pantheon+ and DES 5YR Cal
 ibration Uncertainties: Dovekie
UID:CAL-8a000483-92c3adf6-0195-d2e35cc0-000009fbdemobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Panel_Seminar_Colloquium:/us
 er/public-user/Lectures_Conferences/Panel_Seminar_Colloquium
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-SPEAKER:Brodie Popovic
X-BEDEWORK-DUKE-SERIES:Cosmology Seminar Series
X-BEDEWORK-SUBMITTEDBY:amm342 for Physics (agrp__ArtsandSciences_Physics)
END:VEVENT
END:VCALENDAR