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Amalgame: Cosmological Constraints from the First Combined Photometric Supernova Sample
Authors
Ava Claire Bailey
Dillon Brout
+12Â more
Rebecca Chen
Lisa Kelsey
Richard Kessler
Utsav Patel
Erik R. Peterson
Brodie Popovic
Bruno O. Sanchez
Daniel Scolnic
Mark Sullivan
Marcus Toy
Maria Vincenzi
Phil Wiseman
Publication date
11 September 2023
Publisher
View
on
arXiv
Abstract
Future constraints of cosmological parameters from Type Ia supernovae (SNe Ia) will depend on the use of photometric samples, those samples without spectroscopic measurements of the SNe Ia. There is a growing number of analyses that show that photometric samples can be utilised for precision cosmological studies with minimal systematic uncertainties. To investigate this claim, we perform the first analysis that combines two separate photometric samples, SDSS and Pan-STARRS, without including a low-redshift anchor. We evaluate the consistency of the cosmological parameters from these two samples and find they are consistent with each other to under
1
σ
1\sigma
1
σ
. From the combined sample, named Amalgame, we measure
Ω
M
=
0.328
±
0.024
\Omega_M = 0.328 \pm 0.024
Ω
M
​
=
0.328
±
0.024
with SN alone in a flat
Λ
\Lambda
Λ
CDM model, and
Ω
M
=
0.330
±
0.018
\Omega_M = 0.330 \pm 0.018
Ω
M
​
=
0.330
±
0.018
and
w
=
−
1.01
6
−
0.058
+
0.055
w = -1.016^{+0.055}_{-0.058}
w
=
−
1.01
6
−
0.058
+
0.055
​
when combining with a Planck data prior and a flat
w
w
w
CDM model. These results are consistent with constraints from the Pantheon+ analysis of only spectroscopically confirmed SNe Ia, and show that there are no significant impediments to analyses of purely photometric samples of SNe Ia.Comment: Submitting to MNRAS; comments welcom
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oai:arXiv.org:2309.05654
Last time updated on 06/10/2023