280 citations · 2.9k across the 59 of their papers we have counts for
30 papers · 1 filter
Follow-up of SN 2025wny I: Space-based Observations of the First Multiply-imaged Superluminous Supernova
Ariel Goobar, Joel Johansson, Edvard Mörtsell +21
We present space-based follow-up observations of the superluminous Type I supernova (SLSN-I) SN 2025wny at redshift , gravitationally lensed by two galaxies at redsh…
Discovery of SN 2025wny: a Strongly Gravitationally Lensed Superluminous Supernova at z = 2.01
Joel Johansson, Daniel A. Perley, Ariel Goobar +31
We present the discovery of SN 2025wny (ZTF25abnjznp/GOTO25gtq) and spectroscopic classification of this event as the first gravitationally lensed Type I superluminous supernovae (…
Detecting strongly-lensed type Ia supernovae with LSST
Nikki Arendse, Suhail Dhawan, Ana Sagués Carracedo +8
Strongly-lensed supernovae are rare and valuable probes of cosmology and astrophysics. Upcoming wide-field time-domain surveys, such as the Vera C. Rubin Observatory's Legacy Surve…
CATS: The Hubble Constant from Standardized TRGB and Type Ia Supernova Measurements
D. Scolnic, A. G. Riess, J. Wu +7
The Tip of the Red Giant Branch (TRGB) provides a luminous standard candle for constructing distance ladders to measure the Hubble constant. In practice its measurements via edge-d…
Growth-rate measurement with type-Ia supernovae using ZTF survey simulations
Bastien Carreres, Julian E. Bautista, Fabrice Feinstein +21
Measurements of the growth rate of structures at with peculiar velocity surveys have the potential of testing the validity of general relativity on cosmic scales. In this…
Type Ia supernova constraints on compact object dark matter
S. Dhawan, E. Mörtsell
The nature of dark matter (DM) is an open question in cosmology, despite its abundance in the universe. While elementary particles have been posited to explain DM, compact astrophy…
Potential signature of a quadrupolar Hubble expansion in Pantheon+ supernovae
Jessica A. Cowell, Suhail Dhawan, Hayley J. Macpherson
The assumption of isotropy -- that the Universe looks the same in all directions on large scales -- is fundamental to the standard cosmological model. This model forms the building…
A BayeSN Distance Ladder: from a consistent modelling of Type Ia supernovae from the optical to the near infrared
Suhail Dhawan, Stephen Thorp, Kaisey S. Mandel +4
The local distance ladder estimate of the Hubble constant () is important in cosmology, given the recent tension with the early universe inference. We estimate from the…
LensWatch: I. Resolved HST Observations and Constraints on the Strongly-Lensed Type Ia Supernova 2022qmx ("SN Zwicky")
J. D. R. Pierel, N. Arendse, S. Ertl +39
Supernovae (SNe) that have been multiply-imaged by gravitational lensing are rare and powerful probes for cosmology. Each detection is an opportunity to develop the critical tools…
Uncovering a population of gravitational lens galaxies with magnified standard candle SN Zwicky
Ariel Goobar, Joel Johansson, Steve Schulze +35
Detecting gravitationally lensed supernovae is among the biggest challenges in astronomy. It involves a combination of two very rare phenomena: catching the transient signal of a s…
Relative intrinsic scatter in hierarchical Type Ia supernova siblings analyses: Application to SNe 2021hpr, 1997bq & 2008fv in NGC 3147
Sam M. Ward, Stephen Thorp, Kaisey S. Mandel +22
We present Young Supernova Experiment photometry of SN 2021hpr, the third Type Ia supernova sibling to explode in the Cepheid calibrator galaxy, NGC 3147. Siblings are usef…
The quadrupole in the local Hubble parameter: first constraints using Type Ia supernova data and forecasts for future surveys
Suhail Dhawan, Antonin Borderies, Hayley J. Macpherson +1
The cosmological principle asserts that the Universe looks spatially homogeneous and isotropic on sufficiently large scales. Given the fundamental implications of the cosmological…
Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
Elcio Abdalla, Guillermo Franco Abellán, Amin Aboubrahim +200
In this paper we will list a few important goals that need to be addressed in the next decade, also taking into account the current discordances between the different cosmological…
Hubble constant and nuclear equation of state from kilonova spectro-photometric light curves
M. A. Pérez-García, L. Izzo, D. Barba +17
The merger of two compact objects of which at least one is a neutron star is signalled by transient electromagnetic emission in a kilonova (KN). This event is accompanied by gravit…
A Uniform Type Ia Supernova Distance Ladder with the Zwicky Transient Facility: Absolute Calibration Based on the Tip of the Red Giant Branch (TRGB) Method
Suhail Dhawan, Ariel Goobar, Joel Johansson +21
The current Cepheid-calibrated distance ladder measurement of is reported to be in tension with the values inferred from the cosmic microwave background (CMB), assuming stand…
The Zwicky Transient Facility Type Ia supernova survey: first data release and results
S. Dhawan, A. Goobar, M. Smith +17
Type Ia supernovae (SNe~Ia) in the nearby Hubble flow are excellent distance indicators in cosmology. The Zwicky Transient Facility (ZTF) has observed a large sample of supernovae…
The Hubble constant from strongly lensed supernovae with standardizable magnifications
Simon Birrer, Suhail Dhawan, Anowar J. Shajib
The dominant uncertainty in the current measurement of the Hubble constant () with strong gravitational lensing time delays is attributed to uncertainties in the mass profiles…
The Hubble Tension Revisited: Additional Local Distance Ladder Uncertainties
Edvard Mortsell, Ariel Goobar, Joel Johansson +1
In a recent paper, we investigated possible systematic uncertainties related to the Cepheid color-luminosity calibration method and their influence on the tension between the Hubbl…
Sensitivity of the Hubble Constant Determination to Cepheid Calibration
Edvard Mortsell, Ariel Goobar, Joel Johansson +1
Motivated by the large observed diversity in the properties of extra-galactic extinction by dust, we re-analyse the Cepheid calibration used to infer the Hubble constant, , fr…
Non-parametric spatial curvature inference using late-universe cosmological probes
Suhail Dhawan, Justin Alsing, Sunny Vagnozzi
Inferring high-fidelity constraints on the spatial curvature parameter, , under as few assumptions as possible, is of fundamental importance in cosmology. We propose a m…
Cosmological model insensitivity of local from the Cepheid distance ladder
S. Dhawan, D. Brout, D. Scolnic +3
The observed tension ( difference) between the local distance ladder measurement of the Hubble constant, , and its value inferred from the cosmic microwave backgroun…
Lens modelling of the strongly lensed Type Ia supernova iPTF16geu
E. Mörtsell, J. Johansson, S. Dhawan +3
In 2016, the first strongly lensed Type Ia supernova, iPTF16geu at redshift with four resolved images arranged symmetrically around the lens galaxy at , was dis…
The Next Generation of Cosmological Measurements with Type Ia Supernovae
Dan Scolnic, Saul Perlmutter, Greg Aldering +56
While Type Ia Supernovae (SNe Ia) are one of the most mature cosmological probes, the next era promises to be extremely exciting in the number of different ways SNe Ia are used to…
The cosmic transparency measured with Type Ia supernovae: implications for intergalactic dust
Ariel Goobar, Suhail Dhawan, Daniel Scolnic
Observations of high-redshift Type Ia supernovae (SNe~Ia) are used to study the cosmic transparency at optical wavelengths. Assuming a flat CDM cosmological model based on BAO a…