Publications (167)
Extreme magnification of a star at redshift 1.5 by a galaxy-cluster lens
Patrick L. Kelly, Jose M. Diego, Steven Rodney +42
Galaxy-cluster gravitational lenses can magnify background galaxies by a total factor of up to ~50. Here we report an image of an individual star at redshift z=1.49 (dubbed "MACS J…
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…
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 Hubble Tension and Early Dark Energy
Marc Kamionkowski, Adam G. Riess
Over the past decade, the disparity between the value of the cosmic expansion rate directly determined from measurements of distance and redshift or instead from the standard C…
Cosmology Intertwined II: The Hubble Constant Tension
Eleonora Di Valentino, Luis A. Anchordoqui, Ozgur Akarsu +90
The current cosmological probes have provided a fantastic confirmation of the standard Cold Dark Matter cosmological model, that has been constrained with unprecedented accura…
SN H0pe: The First Measurement of from a Multiply-Imaged Type Ia Supernova, Discovered by JWST
Massimo Pascale, Brenda L. Frye, Justin D. R. Pierel +21
The first James Webb Space Telescope ({\it JWST}) Near InfraRed Camera (NIRCam) imaging in the field of the galaxy cluster PLCK G165.7+67.0 () uncovered a Type Ia supernova…
A Near-Infrared Period-Luminosity Relation for Miras in NGC 4258, an Anchor for a New Distance Ladder
Caroline D. Huang, Adam G. Riess, Samantha L. Hoffmann +8
We present year-long, near-infrared Hubble Space Telescope WFC3 observations of Mira variables in the water megamaser host galaxy NGC 4258. Miras are AGB variables that can be divi…
Optical Spectra of Type Ia Supernovae at z=0.46 and z=1.2
Alison L. Coil, Thomas Matheson, Alexei V. Filippenko +19
We present optical spectra, obtained with the Keck 10-m telescope, of two high-redshift type Ia supernovae (SNe Ia) discovered by the High-z Supernova Search Team: SN 1999ff at z=0…
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 Case for an Accelerating Universe from Supernovae
Adam G. Riess
The unexpected faintness of high-redshift Type Ia supernovae (SNe Ia), as measured by two teams, has been interpreted as evidence that the expansion of the Universe is accelerating…
Empirical Delay Time Distributions of Type Ia Supernovae From The Extended GOODS/HST Supernova Survey
Louis-Gregory Strolger, Tomas Dahlen, Adam G. Riess
Using the Hubble Space Telescope ACS imaging of the GOODS North and South fields during Cycles 11, 12, and 13, we derive empirical constraints on the delay-time distribution functi…
Measurements of the Rate of Type Ia Supernovae at Redshift z < ~0.3 from the SDSS-II Supernova Survey
Benjamin Dilday, Mathew Smith, Bruce Bassett +33
We present a measurement of the volumetric Type Ia supernova (SN Ia) rate based on data from the Sloan Digital Sky Survey II (SDSS-II) Supernova Survey. The adopted sample of super…
The Extended HST Supernova Survey: The Rate of SNe Ia at z>1.4 Remains Low
Tomas Dahlen, Louis-Gregory Strolger, Adam G. Riess
We use the HST ACS imaging of the two GOODS fields during Cycles 11, 12, and 13 to derive the Type Ia supernova rate in four redshift intervals in the range 0.2<z<1.8. Compared to…
Supernova Cosmology and the ESSENCE project
Jesper Sollerman, Claudio Aguilera, Andy Becker +27
The proper usage of Type Ia supernovae (SNe Ia) as distance indicators has revolutionized cosmology, and added a new dominant component to the energy density of the Universe, dark…
Significant Luminosity Differences of Two Twin Type Ia Supernovae
Ryan J. Foley, Samantha L. Hoffmann, Lucas M. Macri +5
The Type Ia supernovae (SNe Ia) 2011by, hosted in NGC 3972, and 2011fe, hosted in M101, are optical "twins," having almost identical optical light-curve shapes, colours, and near-m…
A Mismatch in the Ultraviolet Spectra between Low-Redshift and Intermediate-Redshift Type Ia Supernovae as a Possible Systematic Uncertainty for Supernova Cosmology
Ryan J. Foley, Alexei V. Filippenko, Richard Kessler +11
We present Keck high-quality rest-frame ultraviolet (UV) through optical spectra of 21 Type Ia supernovae (SNe Ia) in the redshift range 0.11 < z < 0.37 and a mean redshift of 0.22…
Snapshot Distances to Type Ia Supernovae -- All in ``One'' Night's Work
Adam G. Riess, Peter Nugent, Alexei V. Filippenko +2
We present an empirical method which measures the distance to a Type Ia supernova (SN Ia) with a precision of ~ 10% from a single night's data. This method measures the supernova's…
Cosmology Intertwined I: Perspectives for the Next Decade
Eleonora Di Valentino, Luis A. Anchordoqui, Ozgur Akarsu +89
The standard Cold Dark Matter cosmological model provides an amazing description of a wide range of astrophysical and astronomical data. However, there are a few big open ques…
Milky Way Cepheid Standards for Measuring Cosmic Distances and Application to Gaia DR2: Implications for the Hubble Constant
Adam G. Riess, Stefano Casertano, Wenlong Yuan +9
We present HST photometry of a selected sample of 50 long-period, low-extinction Milky Way Cepheids measured on the same WFC3 F555W, F814W, and F160W-band photometric system as ext…
A Measurement of the Rate of Type Ia Supernovae in Galaxy Clusters from the SDSS-II Supernova Survey
Benjamin Dilday, Bruce Bassett, Andrew Becker +32
ABRIDGED We present measurements of the Type Ia supernova (SN) rate in galaxy clusters based on data from the Sloan Digital Sky Survey-II (SDSS-II) Supernova Survey. The cluster SN…
Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
Adam G. Riess, Alexei V. Filippenko, Peter Challis +17
We present observations of 10 type Ia supernovae (SNe Ia) between 0.16 < z < 0.62. With previous data from our High-Z Supernova Search Team, this expanded set of 16 high-redshift s…
The Dark Energy Bedrock All-Sky Supernova Program: Motivation, Design, Implementation, and Preliminary Data Release
Nora F. Sherman, Maria Acevedo, Dillon Brout +20
Precise measurements of Type Ia supernovae (SNe Ia) at low redshifts () serve as one of the most viable keys to unlocking our understanding of cosmic expansion, isotropy, and gr…
Determining the Motion of the Local Group Using SN Ia Light Curve Shapes
Adam G. Riess, William H. Press, Robert P. Kirshner
We have measured our Galaxy's motion relative to distant galaxies in which type Ia supernovae (SN Ia) have been observed. The effective recession velocity of this sample is 7000 km…
Improving the Determination of Supernova Cosmological Redshifts by Using Galaxy Groups
Erik R. Peterson, Bastien Carreres, Anthony Carr +9
At the low-redshift end () of the Hubble diagram with Type Ia Supernovae (SNe Ia), the contribution to Hubble residual scatter from peculiar velocities is of similar size t…
Using SN Ia Light Curve Shapes to Measure The Hubble Constant
Adam G. Riess, William H. Press, Robert P. Kirshner
We present an empirical method which uses visual band light curve shapes (LCS) to estimate the luminosity of type Ia supernovae (SN Ia). This method is first applied to a ``trainin…
The DEHVILS Survey Overview and Initial Data Release: High-Quality Near-Infrared Type Ia Supernova Light Curves at Low Redshift
Erik R. Peterson, David O. Jones, Daniel Scolnic +17
While the sample of optical Type Ia Supernova (SN Ia) light curves (LCs) usable for cosmological parameter measurements surpasses 2000, the sample of published, cosmologically viab…
Consistent Calibration of the Tip of the Red Giant Branch in the Large Magellanic Cloud on the Hubble Space Telescope Photometric System and a Re-determination of the Hubble Constant
Wenlong Yuan, Adam G. Riess, Lucas M. Macri +2
We present a calibration of the Tip of the Red Giant Branch (TRGB) in the Large Magellanic Cloud (LMC) on the HST/ACS F814W system. We use archival HST observations to derive blend…
A sub-2% Distance to M31 from Photometrically Homogeneous Near-Infrared Cepheid Period-Luminosity Relations Measured with the Hubble Space Telescope
Siyang Li, Adam G. Riess, Michael P. Busch +3
We present Period-Luminosity Relations (PLRs) for 55 Cepheids in M31 with periods ranging from 4 to 78 days observed with the Hubble Space Telescope (HST) using the same three-band…
The trouble with
Jose Luis Bernal, Licia Verde, Adam G. Riess
We perform a comprehensive cosmological study of the tension between the direct local measurement and the model-dependent value inferred from the Cosmic Microwave Background.…
High Redshift Supernova Rates
Tomas Dahlen, Louis-Gregory Strolger, Adam G. Riess +10
We use a sample of 42 supernovae detected with the Advanced Camera for Surveys on-board the Hubble Space Telescope as part of the Great Observatories Origins Deep Survey to measure…
First-year Sloan Digital Sky Survey-II (SDSS-II) Supernova Results: Hubble Diagram and Cosmological Parameters
Richard Kessler, Andrew Becker, David Cinabro +43
We present measurements of the Hubble diagram for 103 Type Ia supernovae (SNe) with redshifts 0.04 < z < 0.42, discovered during the first season (Fall 2005) of the Sloan Digital 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…
Identification of Type Ia Supernovae at Redshift 1.3 and Beyond with the Advanced Camera for Surveys on HST
Adam G. Riess, Louis-Gregory Strolger, John Tonry +15
We present discoveries of SNe Ia at z > 1 and the photometric diagnostic used to discriminate them from other types of SNe detected during the GOODS Hubble Space Telescope Treasury…
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…
Peculiar Velocities from Type Ia Supernovae
Adam G. Riess
Type Ia supernovae have only recently been employed to measure the peculiar motions of galaxies. The great distances to which SNe Ia can be seen makes them particularly well-suited…
JAGB 2.0: Improved Constraints on the J-region Asymptotic Giant Branch-based Hubble Constant from an Expanded Sample of JWST Observations
Siyang Li, Adam G. Riess, Daniel Scolnic +2
The J-region Asymptotic Giant Branch (JAGB) is an overdensity of stars in the near-infrared, attributed to carbon-rich asymptotic giant branch stars, and recently used as a standar…
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 Pantheon+ Analysis: Evaluating Peculiar Velocity Corrections in Cosmological Analyses with Nearby Type Ia Supernovae
Erik R. Peterson, W. D'Arcy Kenworthy, Daniel Scolnic +10
Separating the components of redshift due to expansion and peculiar motion in the nearby universe () is critical for using Type Ia Supernovae (SNe Ia) to measure the Hubble…
The Accuracy of the Hubble Constant Measurement Verified through Cepheid Amplitudes
Adam G. Riess, Wenlong Yuan, Stefano Casertano +2
The accuracy of the Hubble constant measured with extragalactic Cepheids depends on robust photometry and background estimation in the presence of stellar crowding. The conventiona…
Comparing Tip of the Red Giant Branch Distance Scales: An Independent Reduction of the Carnegie-Chicago Hubble Program and the Value of the Hubble Constant
Gagandeep S. Anand, R. Brent Tully, Luca Rizzi +2
The tip of the red giant branch has been used to measure distances to 500 nearby galaxies with the Hubble Space Telescope (HST) which are available in the Color-Magnitude Diagrams…
RELICS: Reionization Lensing Cluster Survey
Dan Coe, Brett Salmon, Marusa Bradac +54
Large surveys of galaxy clusters with the Hubble and Spitzer Space Telescopes, including CLASH and the Frontier Fields, have demonstrated the power of strong gravitational lensing…
A Local Hubble Bubble from SNe Ia?
Idit Zehavi, Adam G. Riess, Robert P. Kirshner +1
We analyze the monopole in the peculiar velocities of 44 Type Ia supernovae (SNe Ia) to test for a local void. The sample extends from 20 to 300 Mpc/h, with distances, deduced from…
Cepheid Calibrations of Modern Type Ia Supernovae:Implications for the Hubble Constant
Adam G. Riess, Lucas Macri, Weidong Li +9
This is the first of two papers reporting measurements from a program to determine the Hubble constant to 5% precision from a refurbished distance ladder. We present new observatio…
Improving Dark Energy Constraints with High Redshift Type Ia Supernovae from CANDELS and CLASH
Vincenzo Salzano, Steven A. Rodney, Irene Sendra +5
Aims. We investigate the degree of improvement in dark energy constraints that can be achieved by extending Type Ia Supernova (SN Ia) samples to redshifts z > 1.5 with the Hubble S…
The Effect of Host Galaxies on Type Ia Supernovae in the SDSS-II Supernova Survey
Hubert Lampeitl, Mathew Smith, Robert C. Nichol +18
We present an analysis of the host galaxy dependencies of Type Ia Supernovae (SNe Ia) from the full three year sample of the SDSS-II Supernova Survey. We rediscover, to high signif…
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…
The Discovery of the Most Distant Known Type Ia Supernova at Redshift 1.914
David O. Jones, Steven A. Rodney, Adam G. Riess +22
We present the discovery of a Type Ia supernova (SN) at redshift from the CANDELS multi-cycle treasury program on the \textit{Hubble Space Telescope (HST)}. This SN was…
The Velocity Field from Type Ia Supernovae Matches the Gravity Field from Galaxy Surveys
Adam G. Riess, Marc Davis, Jonathan Baker +1
We compare the peculiar velocities of nearby SNe Ia with those predicted by the gravity fields of full sky galaxy catalogs. The method provides a powerful test of the gravitational…
Cepheid Period-Luminosity Relations in the Near-Infrared and the Distance to M31 from the Hubble Space Telescope Wide Field Camera 3
Adam G. Riess, Juergen Fliri, David Valls-Gabaud
We present measurements of 68 classical Cepheids with periods from 10 to 78 days observed in the near-infrared by the PHAT Program using the Wide Field Camera 3 (WFC3) on the Hubbl…
A Synthetic Roman Space Telescope High-Latitude Time-Domain Survey: Supernovae in the Deep Field
Kevin X. Wang, Dan Scolnic, M. A. Troxel +14
NASA will launch the Nancy Grace Roman Space Telescope (Roman) in the second half of this decade, which will allow for a generation-defining measurement of dark energy through mult…
Optical Identification of Cepheids in 19 Host Galaxies of Type Ia Supernovae and NGC 4258 with the Hubble Space Telescope
Samantha L. Hoffmann, Lucas M. Macri, Adam G. Riess +10
We present results of an optical search for Cepheid variable stars using the Hubble Space Telescope (HST) in 19 hosts of Type Ia supernovae (SNe Ia) and the maser-host galaxy NGC 4…
A 3% Solution: Determination of the Hubble Constant with the Hubble Space Telescope and Wide Field Camera 3
Adam G. Riess, Lucas Macri, Stefano Casertano +6
We use the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope to determine the Hubble constant (H0) from optical and infrared observations of over 600 Cepheid variables in th…
A 2.4% Determination of the Local Value of the Hubble Constant
Adam G. Riess, Lucas M. Macri, Samantha L. Hoffmann +12
We use the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST) to reduce the uncertainty in the local value of the Hubble constant (H_0) from 3.3% to 2.4%. Improvements…
Identification of the Red Supergiant Progenitor of Supernova 2005cs: Do the Progenitors of Type II-P Supernovae Have Low Mass?
Weidong Li, Schuyler D. Van Dyk, Alexei V. Filippenko +5
The stars that end their lives as supernovae (SNe) have been directly observed in only a handful of cases, due mainly to the extreme difficulty in identifying them in images obtain…
The Rate of Core Collapse Supernovae to Redshift 2.5 From The CANDELS and CLASH Supernova Surveys
Louis-Gregory Strolger, Tomas Dahlen, Steven A. Rodney +6
The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) and Cluster Lensing And Supernova survey with Hubble (CLASH) multi-cycle treasury programs with the Hub…
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…
Blue supergiants in the Pinwheel Galaxy M101: comparison with H II region chemical abundances, spectroscopic distance and an independent determination of the Hubble constant
Fabio Bresolin, Rolf-Peter Kudritzki, Miguel A. Urbaneja +2
We present a quantitative spectroscopic study of 13 blue supergiant stars in the Pinwheel Galaxy M101, based on data obtained with the Low Resolution Imaging Spectrometer available…
An Improved Calibration of the Wavelength Dependence of Metallicity on the Cepheid Leavitt law
Louise Breuval, Adam G. Riess, Pierre Kervella +2
The Cepheid period-luminosity (PL) relation (or Leavitt law) has served as the first rung of the most widely used extragalactic distance ladder and is central to the determination…
The Parallax of Omega Centauri Measured from Gaia EDR3 and a Direct, Geometric Calibration of the Tip of the Red Giant Branch and the Hubble Constant
John Soltis, Stefano Casertano, Adam G. Riess
We use data from the ESA Gaia mission Early Data Release 3 (EDR3) to measure the trigonometric parallax of Cen, the first high precision parallax measurement for the most mass…
Calibrating the Tully-Fisher Relation to Measure the Hubble Constant
Daniel Scolnic, Paula Boubel, Jakob Byrne +2
Boubel et al. 2024 (B24) recently used the Tully-Fisher (TF) relation to measure calibrated distances in the Hubble flow and found km/s/Mpc…
Cosmic Distances Calibrated to 1% Precision with Gaia EDR3 Parallaxes and Hubble Space Telescope Photometry of 75 Milky Way Cepheids Confirm Tension with LambdaCDM
Adam G. Riess, Stefano Casertano, Wenlong Yuan +4
We present an expanded sample of 75 Milky Way Cepheids with Hubble Space Telescope (HST) photometry and Gaia EDR3 parallaxes which we use to recalibrate the extragalactic distance…
NICMOS Status
Roelof S. de Jong, Santiago Arribas, Elizabeth Barker +15
We provide an overview of the most important calibration aspects of the NICMOS instrument on board of HST. We describe the performance of the instrument after the installation of t…
The Extended Hubble Space Telescope Supernova Survey: The Rate of Core Collapse Supernovae to z~1
Tomas Dahlen, Louis-Gregory Strolger, Adam G. Riess +3
We use a sample of 45 core collapse supernovae detected with the Advanced Camera for Surveys on-board the Hubble Space Telescope to derive the core collapse supernova rate in the r…
The Pantheon+ Analysis: The Full Dataset and Light-Curve Release
Dan Scolnic, Dillon Brout, Anthony Carr +27
Here we present 1701 light curves of 1550 spectroscopically confirmed Type Ia supernovae (SNe Ia) that will be used to infer cosmological parameters as part of the Pantheon+ SN ana…
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…
The Cepheid Distance to the Seyfert 1 Galaxy NGC 4151
Wenlong Yuan, Michael M. Fausnaugh, Samantha L. Hoffmann +15
We derive a distance of Mpc to the archetypical Seyfert 1 galaxy NGC 4151 based on the near-infrared Cepheid Period-Luminosity relation and new Hubble Space Telescope…
The Rise and Fall of Type Ia Supernova Light Curves in the SDSS-II Supernova Survey
Brian T. Hayden, Peter M. Garnavich, Richard Kessler +13
We analyze the rise and fall times of type Ia supernova (SN Ia) light curves discovered by the SDSS-II Supernova Survey. From a set of 391 light curves k-corrected to the rest fram…
Imaging and Demography of the Host Galaxies of High-Redshift Type Ia Supernovae
Benjamin F. Williams, Craig J. Hogan, Brian Barris +24
We present the results of a study of the host galaxies of high redshift Type Ia supernovae (SNe Ia). We provide a catalog of 18 hosts of SNe Ia observed with the Hubble Space Teles…
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…
Cosmology Intertwined IV: The Age of the Universe and its Curvature
Eleonora Di Valentino, Luis A. Anchordoqui, Ozgur Akarsu +88
A precise measurement of the curvature of the Universe is of primeval importance for cosmology since it could not only confirm the paradigm of primordial inflation but also help in…
The Cepheid Distance to the Narrow-Line Seyfert 1 Galaxy NGC 4051
Wenlong Yuan, Lucas M. Macri, Bradley M. Peterson +15
We derive a distance of ~Mpc (~mag) to the archetypal narrow-line Seyfert 1 galaxy NGC 4051 based on Cepheid Period--Luminosity relations and new…
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…
Light Curves of 213 Type Ia Supernovae from the ESSENCE Survey
Gautham Narayan, Armin Rest, Brad E. Tucker +34
The ESSENCE survey discovered 213 Type Ia supernovae at redshifts 0.1 < z < 0.81 between 2002 and 2008. We present their R and I-band photometry, measured from images obtained usin…
CANDELS: The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey
Norman A. Grogin, Dale D. Kocevski, S. M. Faber +104
The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) is designed to document the first third of galactic evolution, over the approximate redshift (z) range…
The Subluminous Type Ia Supernova 1998de in NGC 252
Maryam Modjaz, Weidong Li, Alexei V. Filippenko +5
We present spectroscopic and extensive photometric observations of supernova (SN) 1998de in the S0 galaxy NGC 252, discovered during the course of the Lick Observatory Supernova Se…
The Milky Way Cepheid Leavitt law based on Gaia DR2 parallaxes of companion stars and host open cluster populations
Louise Breuval, Pierre Kervella, Richard I. Anderson +12
Classical Cepheids provide the foundation for the empirical extragalactic distance ladder. Milky Way Cepheids are the only stars in this class accessible to trigonometric parallax…
A test of Gaia Data Release 1 parallaxes: implications for the local distance scale
Stefano Casertano, Adam G. Riess, Beatrice Bucciarelli +1
We present a comparison of Gaia Data Release 1 (DR1) parallaxes with photometric parallaxes for a sample of 212 Galactic Cepheids at a median distance of 2~kpc, and explore their i…
Hubble Space Telescope Observations of Mira Variables in the Type Ia Supernova Host NGC 1559: An Alternative Candle to Measure the Hubble Constant
Caroline D. Huang, Adam G. Riess, Wenlong Yuan +7
We present year-long, near-infrared Hubble Space Telescope WFC3 observations used to search for Mira variables in NGC 1559, the host galaxy of the Type Ia supernova (SN Ia) 2005df.…
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…
The High-Z Supernova Search: Measuring Cosmic Deceleration and Global Cur vature of the Universe Using Type Ia Supernovae
Brian P. Schmidt, Nicholas B. Suntzeff, M. M. Phillips +21
The High-Z Supernova Search is an international collaboration to discover and monitor type Ia supernovae (SN Ia) at with the aim of measuring cosmic deceleration and glob…
CANDELS: The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey - The Hubble Space Telescope Observations, Imaging Data Products and Mosaics
Anton M. Koekemoer, S. M. Faber, Henry C. Ferguson +120
This paper describes the Hubble Space Telescope imaging data products and data reduction procedures for the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS). This…
Did LIGO detect dark matter?
Simeon Bird, Ilias Cholis, Julian B. Muñoz +5
We consider the possibility that the black-hole (BH) binary detected by LIGO may be a signature of dark matter. Interestingly enough, there remains a window for masses $20\,M_\odot…
ACCESS: Enabling an Improved Flux Scale for Astrophysics
Mary Elizabeth Kaiser, Jeffrey W. Kruk, Stephan R. McCandliss +20
Improvements in the precision of the astrophysical flux scale are needed to answer fundamental scientific questions ranging from cosmology to stellar physics. The unexpected discov…
Report of the Topical Group on Cosmic Probes of Fundamental Physics for for Snowmass 2021
Rana X. Adhikari, Luis A. Anchordoqui, Ke Fang +118
Cosmic Probes of Fundamental Physics take two primary forms: Very high energy particles (cosmic rays, neutrinos, and gamma rays) and gravitational waves. Already today, these probe…
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…
Results from the High-Z Supernova Search Team
Alexei V. Filippenko, Adam G. Riess
We review the use of Type Ia supernovae for cosmological distance determinations. Low-redshift SNe Ia () demonstrate that (a) the Hubble expansion is linear, (b) $H…
High-resolution Spectroscopic Metallicities of Milky Way Cepheid Standards and their impact on the Leavitt Law and the Hubble constant
Anupam Bhardwaj, Adam G. Riess, Giovanni Catanzaro +10
Milky Way Cepheid variables with accurate {\it Hubble Space Telescope} photometry have been established as standards for primary calibration of the cosmic distance ladder to achiev…
Discovery of Two Distant Type Ia Supernovae in the Hubble Deep Field North with the Advanced Camera for Surveys
John P. Blakeslee, Zlatan I. Tsvetanov, Adam G. Riess +30
We present observations of the first two supernovae discovered with the recently installed Advanced Camera for Surveys (ACS) on the Hubble Space Telescope. The supernovae were foun…
An updated measurement of the Hubble constant from near-infrared observations of Type Ia supernovae
LluÃs Galbany, Thomas de Jaeger, Adam G. Riess +11
We present a measurement of the Hubble constant () using type Ia supernova (SNe Ia) in the near-infrared (NIR) from the recently updated sample of SNe Ia in nearby galaxies wi…
Type Ia Supernova Distances at z > 1.5 from the Hubble Space Telescope Multi-Cycle Treasury Programs: The Early Expansion Rate
Adam G. Riess, Steven A. Rodney, Daniel M. Scolnic +31
We present an analysis of 15 Type Ia supernovae (SNe Ia) at redshift z > 1 (9 at 1.5 < z < 2.3) recently discovered in the CANDELS and CLASH Multi-Cycle Treasury programs using WFC…
Characterizing the contaminating distance distribution for Bayesian supernova cosmology
Bridget L. Falck, Adam G. Riess, Renee Hlozek
Measurements of the equation of state of dark energy from surveys of thousands of Type Ia Supernovae (SNe Ia) will be limited by spectroscopic follow-up and must therefore rely on…
A Redetermination of the Hubble Constant with the Hubble Space Telescope from a Differential Distance Ladder
Adam G. Riess, Lucas Macri, Stefano Casertano +8
We report observations of 240 Cepheid variables obtained with the Near Infrared Camera (NICMOS) through the F160W filter on the Hubble Space Telescope (HST). The Cepheids are distr…
BVRI Light Curves for 22 Type Ia Supernovae
Adam G. Riess, Robert P. Kirshner, Brian P. Schmidt +6
We present 1210 Johnson/Cousins B,V,R, and I photometric observations of 22 recent type Ia supernovae (SNe Ia): SN 1993ac, SN 1993ae, SN 1994M, SN 1994S, SN 1994T, SN 1994Q, SN 199…
Still Brighter than Pre-Explosion, SN 2012Z Did Not Disappear: Comparing Hubble Space Telescope Observations a Decade Apart
Curtis McCully, Saurabh W. Jha, Richard A. Scalzo +10
Type Iax supernovae represent the largest class of peculiar white-dwarf supernovae. The type Iax SN~2012Z in NGC 1309 is the only white dwarf supernova with a detected progenitor s…
On the Color-Metallicity Relation of the Red Clump and the Reddening Toward the Magellanic Clouds
David M. Nataf, Santi Cassisi, Luca Casagrande +2
The zero point of the reddening toward the Large Magellanic Cloud (LMC) has been the subject of some dispute. Its uncertainty propagates as a systematic error for methods which mea…
Cosmological Results from High-z Supernovae
John L. Tonry, Brian P. Schmidt, Brian Barris +22
The High-z Supernova Search Team has discovered and observed 8 new supernovae in the redshift interval z=0.3-1.2. These independent observations, confirm the result of Riess et al.…
HST/JWST Long-Term Monitoring Working Group Final Report
Saurabh W. Jha, Dana I. Casetti-Dinescu, Gary M. Bernstein +9
The Astro2020 Decadal Survey recognizes time-domain astronomy as a key science area over the next decade and beyond. With over 30 years of HST data and the potential for 20 years o…
Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
Adam G. Riess, Stefano Casertano, Wenlong Yuan +2
We present an improved determination of the Hubble constant (H0) from Hubble Space Telescope (HST) observations of 70 long-period Cepheids in the Large Magellanic Cloud. These were…
New Parallaxes of Galactic Cepheids from Spatially Scanning the Hubble Space Telescope: Implications for the Hubble Constant
Adam G. Riess, Stefano Casertano, Wenlong Yuan +8
We present new parallax measurements of 7 long-period (> 10 days) Milky Way Cepheids (SS CMa, XY Car, VY Car, VX Per, WZ Sgr, X Pup and S Vul) using astrometry from spatial scannin…
Type II-P Supernovae from the SDSS-II Supernova Survey and the Standardized Candle Method
Chris B. D'Andrea, Masao Sako, Benjamin Dilday +24
We apply the Standardized Candle Method (SCM) for Type II Plateau supernovae (SNe II-P), which relates the velocity of the ejecta of a SN to its luminosity during the plateau, to 1…