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Supernova Cousins: The Intrinsic Dispersion and Environmental Dependence of Type Ia Supernovae in Galaxy Groups with TITAN
Allison Blum, Erik R. Peterson, David O. Jones +7
At low redshift, scatter in the Type Ia supernova (SN Ia) Hubble diagram is increased by peculiar velocities (PVs) and correlations between SN distances and their host-galaxy envir…
A Simulation Based Inference Approach to Modelling of Type Ia Supernova Populations
B. Popovic, M. Grayling, M. O'Callaghan +10
Type Ia Supernovae (SNe Ia) are prominent cosmological probes, utilising a standardisation process to reduce their observed scatter to mag. A growing number of models se…
The Peculiar Growth of Structure: Validating Measurements from TITAN Type Ia Supernovae and the Uchuu Simulations
Mitchell Dixon, David O. Jones, Nicole E. Drakos +11
The growth rate of cosmic structure, parameterized by , is a fundamental test of CDM and general relativity. Using Type Ia supernova (SN Ia) peculiar velocities in conjunc…
Old Universe, Young SNe Ia: A Statistical Analysis of Type Ia Supernova Progenitor Age from 6,983 TITAN Host Galaxies, and Implications for Cosmology
Yukei Murakami, Jack Tweddle, Phil Wiseman +17
Correlations between standardized Type Ia supernova (SN Ia) luminosities and host-galaxy properties are routinely modeled to avoid bias in cosmological parameter inference. A recen…
Still Accelerating: Type Ia supernova cosmology is robust to host galaxy age evolution
Phil Wiseman, Brodie Popovic, Mark Sullivan +14
Type Ia supernovae are a cornerstone of modern cosmology, providing first evidence for cosmic acceleration and new tests of dark energy. Son et al. 2025 (S25) claim a strong redshi…
TITAN DR1: An Improved, Validated, and Systematically-Controlled Recalibration of ATLAS Photometry toward Type Ia Supernova Cosmology
Elijah G. Marlin, Yukei S. Murakami, Dillon Brout +14
ATLAS (Asteroid Terrestrial Last Alert System) is a time-domain survey using four telescopes, covering the entire sky. It has observed over 10,000 spectroscopically confirmed Type…
The Perfect Host: JWST Cepheid Observations in a Background-Free SN Ia Host Confirm No Bias in Hubble-Constant Measurements
Adam G. Riess, Siyang Li, Gagandeep S. Anand +8
Cycle 1 JWST observations of Cepheids in SN Ia hosts resolved their red-giant-dominated NIR backgrounds, sharply reducing crowding and showing that photometric bias in lower-resolu…
Reassessing the ZTF Volume-Limited Type Ia Supernova Sample and Its Implications for Continuous, Dust-Dependent Models of Intrinsic Scatter
Yukei S. Murakami, Daniel Scolnic
The ZTF DR2 includes light curves of 3628 Type Ia supernovae (SNe Ia), making it the largest low-redshift SNe Ia sample available. One central question for analyses of SNe Ia is wh…
The Complete Sample of Available SNe Ia Luminosity Calibrations from the TRGB Observed with either HST or JWST
Siyang Li, Adam G. Riess, Gagandeep S. Anand +4
Distance ladders which calibrate the luminosity of Type Ia supernovae (SNe Ia) currently provide the strongest constraints on the local value of H0. Recent studies from the Hubble…
The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533
The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades.…
The Extinction Law in SN Ia Hosts from Background Galaxy Measurements: Toward a 1% Determination of
Yukei S. Murakami, Adam G. Riess, Henry C. Ferguson +4
In the most precise distance ladder determination of , the observed near-infrared (NIR) fluxes of Cepheids are corrected for dust, assuming that the extinction law in large, s…
The Hubble Tension in our own Backyard: DESI and the Nearness of the Coma Cluster
Daniel Scolnic, Adam G. Riess, Yukei S. Murakami +8
The Dark Energy Spectroscopic Instrument (DESI) collaboration measured a tight relation between the Hubble constant () and the distance to the Coma cluster using the fundament…
JWST Validates HST Distance Measurements: Selection of Supernova Subsample Explains Differences in JWST Estimates of Local H0
Adam G. Riess, Dan Scolnic, Gagandeep S. Anand +16
JWST provides new opportunities to cross-check the HST Cepheid/SNeIa distance ladder, which yields the most precise local measure of H0. We analyze early JWST subsamples (~1/4 of t…
Small Magellanic Cloud Cepheids Observed with the Hubble Space Telescope Provide a New Anchor for the SH0ES Distance Ladder
Louise Breuval, Adam G. Riess, Stefano Casertano +7
We present phase-corrected photometric measurements of 88 Cepheid variables in the core of the Small Magellanic Cloud (SMC), the first sample obtained with the Hubble Space Telesco…
Leveraging SN Ia spectroscopic similarity to improve the measurement of
Yukei S. Murakami, Adam G. Riess, Benjamin E. Stahl +7
Recent studies suggest spectroscopic differences explain a fraction of the variation in Type Ia supernova (SN Ia) luminosities after light-curve/color standardization. In this work…
A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team
Adam G. Riess, Wenlong Yuan, Lucas M. Macri +15
We report observations from HST of Cepheids in the hosts of 42 SNe Ia used to calibrate the Hubble constant (H0). These include all suitable SNe Ia in the last 40 years at z<0.01,…
On the relationship between Type Ia supernova luminosity and host-galaxy properties
Yukei S. Murakami, Benjamin E. Stahl, Keto D. Zhang +4
A string of recent studies has debated the exact form and physical origin of an evolutionary trend between the peak luminosity of Type Ia supernovae (SNe Ia) and the properties of…
Improving Bayesian posterior correlation analysis on Type Ia supernova luminosity evolution
Keto D. Zhang, Yukei S. Murakami, Benjamin E. Stahl +2
Much of the cosmological utility thus far extracted from Type Ia supernovae (SNe Ia) relies on the assumption that SN~Ia peak luminosities do not evolve significantly with the age…