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47 papers
Breaking the AGB Color Degeneracy with Variability and HO: A Consistent Picture of AGB Chemistry, Dust, and the J-Region Across Environments
Caroline D. Huang, Massimo Marengo, Antonio Capodagli +7
Resolved asymptotic giant branch (AGB) populations present many observational puzzles. We consider three often treated separately: photometric C/O classification boundaries must be…
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…
Converging on the Cepheid Metallicity Dependence: Implications of Non-Standard Gaia Parallax Recalibration on Distance Measures
Louise Breuval, Gagandeep S. Anand, Richard I. Anderson +20
By comparing Cepheid brightnesses with geometric distance measures including Gaia EDR3 parallaxes, most recent analyses conclude metal-rich Cepheids are brighter, quantified as $γ\…
The Hubble constant anchor galaxy NGC 4258: metallicity and distance from blue supergiants
Rolf-Peter Kudritzki, Miguel A. Urbaneja, Fabio Bresolin +5
A quantitative spectroscopic study of blue supergiant stars in the Hubble constant anchor galaxy NGC 4258 is presented. The non-LTE analysis of Keck I telescope LRIS spectra yields…
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…
Tip of the Red Giant Branch Distances with JWST. II. I-band Measurements in a Sample of Hosts of 10 SN Ia Match HST Cepheids
Siyang Li, Gagandeep S. Anand, Adam G. Riess +7
The Hubble Tension, a >5 sigma discrepancy between direct and indirect measurements of the Hubble constant (H0), has persisted for a decade and motivated intense scrutiny of the pa…
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…
Reconnaissance with JWST of the J-region Asymptotic Giant Branch in Distance Ladder Galaxies: From Irregular Luminosity Functions to Approximation of the Hubble Constant
Siyang Li, Adam G. Riess, Stefano Casertano +5
We study stars in the J-regions of the asymptotic giant branch (JAGB) of near-infrared color magnitude diagrams in the maser host NGC 4258 and 4 hosts of 6 Type Ia supernovae (SN I…
The Mira Distance to M101 and a 4% Measurement of H0
Caroline D. Huang, Wenlong Yuan, Adam G. Riess +8
The giant spiral galaxy M101 is host to the nearest recent Type Ia Supernova (SN 2011fe) and thus has been extensively monitored in the near-infrared to study the late-time lightcu…
The Mira Distance Ladder
Caroline D. Huang
Here we provide a review of Mira variables, their basic properties, and Period-Luminosity Relations with an emphasis on their role in measuring the Hubble Constant. The usage of mu…
JWST Observations Reject Unrecognized Crowding of Cepheid Photometry as an Explanation for the Hubble Tension at 8 sigma Confidence
Adam G. Riess, Gagandeep S. Anand, Wenlong Yuan +7
We present high-definition observations with the James Webb Space Telescope of >1000 Cepheids in a geometric anchor of the distance ladder, NGC4258, and in 5 hosts of 8 SNe~Ia, a f…
Tip of the Red Giant Branch Distances with JWST: An Absolute Calibration in NGC 4258 and First Applications to Type Ia Supernova Hosts
Gagandeep S. Anand, Adam G. Riess, Wenlong Yuan +12
The tip of the red giant branch (TRGB) allows for the measurement of precise and accurate distances to nearby galaxies, based on the brightest ascent of low-mass red giant branch s…
Crowded No More: The Accuracy of the Hubble Constant Tested with High Resolution Observations of Cepheids by JWST
Adam G. Riess, Gagandeep S. Anand, Wenlong Yuan +7
High-resolution JWST observations can test confusion-limited HST observations for a photometric bias that could affect extragalactic Cepheids and the determination of the Hubble co…
Standardized Luminosity of the Tip of the Red Giant Branch utilizing Multiple Fields in NGC 4258 and the CATs Algorithm
Siyang Li, Adam G. Riess, Dan Scolnic +6
The Tip of the Red Giant Branch provides a luminous standard candle for calibrating distance ladders that reach Type Ia supernova (SN Ia) hosts. However, recent work reveals that t…
Reassessing the Constraints from SH0ES Extragalactic Cepheid Amplitudes on Systematic Blending Bias
Amir Sharon, Doron Kushnir, Wenlong Yuan +2
The SH0ES collaboration Hubble constant determination is in a difference with the value, known as the Hubble tension. The accuracy of the Hubble constant measur…
A 1.3% distance to M33 from HST Cepheid photometry
Louise Breuval, Adam G. Riess, Lucas M. Macri +7
We present a low-dispersion period-luminosity relation (PL) based on 154 Cepheids in Messier 33 (M33) with Hubble Space Telescope (HST) photometry from the PHATTER survey. Using hi…
A First Look at Cepheids in a SN Ia Host with JWST
Wenlong Yuan, Adam G. Riess, Stefano Casertano +1
We report the first look at extragalactic Cepheid variables with the James Webb Space Telescope, obtained from a serendipitous (to this purpose) observation of NGC 1365, host of an…
Cluster Cepheids with High Precision Gaia Parallaxes, Low Zeropoint Uncertainties, and Hubble Space Telescope Photometry
Adam G. Riess, Louise Breuval, Wenlong Yuan +6
We present HST photometry of 17 Cepheids in open clusters and their mean parallaxes from Gaia EDR3. These parallaxes are more precise than those from individual Cepheids (G<8 mag)…
Measurements of the Hubble Constant with a Two Rung Distance Ladder: Two Out of Three Ain't Bad
W. D'Arcy Kenworthy, Adam G. Riess, Daniel Scolnic +7
The three rung distance ladder, which calibrates Type Ia supernovae through stellar distances linked to geometric measurements, provides the highest precision direct measurement of…
Absolute Calibration of Cepheid Period-Luminosity Relations in NGC 4258
Wenlong Yuan, Lucas M. Macri, Adam G. Riess +6
NGC 4258 is one of the most important anchors for calibrating the Cepheid period--luminosity relations (PLRs) owing to its accurate distance measured from water maser motions. We e…
Interacting and quark matter at finite densities and quark stars
Wen-Li Yuan, Ang Li, Zhiqiang Miao +2
The stability and equation of state of quark matter are studied within both two-flavor and (2+1)-flavor Nambu-Jona-Lasinio (NJL) models including the vector interactions. With a fr…
H-band light curves of Milky Way Cepheids via Difference Imaging
Tarini Konchady, Ryan J. Oelkers, David O. Jones +4
We present H-band light curves of Milky Way Classical Cepheids observed as part of the DEHVILS survey with the Wide-Field Infrared Camera on the United Kingdom InfraRed Telescope.…
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,…
The iron and oxygen content of LMC Classical Cepheids and its implications for the Extragalactic Distance Scale and Hubble constant
Martino Romaniello, Adam Riess, Sara Mancino +6
Classical Cepheids are primary distance indicators and a crucial stepping stone to determining the present-day Hubble constant Ho to the precision and accuracy required to constrai…