S. D. Ryder
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View article: The Demographics of Binary Companions to Stripped-Envelope Supernovae: Confronting Population Synthesis Models with Observations
The Demographics of Binary Companions to Stripped-Envelope Supernovae: Confronting Population Synthesis Models with Observations Open
Stripped-envelope supernovae (SESNe) mark the deaths of massive stars without hydrogen-rich envelopes. Most SESNe likely originate from binary systems where a companion stripped the progenitor of its envelope. Years of HST imaging of nearb…
View article: A depolarization census of ASKAP fast radio bursts
A depolarization census of ASKAP fast radio bursts Open
Fast radio bursts (FRBs) are luminous, dispersed pulses of extragalactic origin. The physics of the emission mechanism, the progenitor environment, and their origin are unclear. Some repeating FRBs exhibit a frequency-dependent decrease in…
View article: The Radio Flare and Multiwavelength Afterglow of the Short GRB 231117A: Energy Injection from a Violent Shell Collision
The Radio Flare and Multiwavelength Afterglow of the Short GRB 231117A: Energy Injection from a Violent Shell Collision Open
We present the early radio detection and multiwavelength modeling of the short gamma-ray burst (GRB) 231117A at redshift z = 0.257. The Australia Telescope Compact Array automatically triggered a 9 hr observation of GRB 231117A at 5.5 and …
View article: Hubble Space Telescope Deep Upper Limits Rule out a Surviving Massive Binary Companion to the Type Ic Supernova 2012fh
Hubble Space Telescope Deep Upper Limits Rule out a Surviving Massive Binary Companion to the Type Ic Supernova 2012fh Open
Current explanations of the mass-loss mechanism for stripped-envelope supernovae (SNe) remain divided between single and binary progenitor systems. Here we obtain deep ultraviolet (UV) imaging with the Hubble Space Telescope (HST) of the T…
View article: Mapping the Spatial Distribution of Fast Radio Bursts within their Host Galaxies
Mapping the Spatial Distribution of Fast Radio Bursts within their Host Galaxies Open
We present deep optical and near-infrared observations of the host galaxies of 34 fast radio bursts (FRBs) detected by the Commensal Real-time ASKAP Fast Transient (or CRAFT) survey on the Australian SKA Pathfinder (ASKAP) to compare the l…
View article: HST Deep Upper Limits Rule Out a Surviving Massive Binary Companion to the Type Ic Supernova 2012fh
HST Deep Upper Limits Rule Out a Surviving Massive Binary Companion to the Type Ic Supernova 2012fh Open
Current explanations of the mass-loss mechanism for stripped-envelope supernovae remain divided between single and binary progenitor systems. Here we obtain deep ultraviolet (UV) imaging with the Hubble Space Telescope (HST) of the Type Ic…
View article: The Demographics of Binary Companions to Stripped-Envelope Supernovae: Confronting Observations with Population Synthesis
The Demographics of Binary Companions to Stripped-Envelope Supernovae: Confronting Observations with Population Synthesis Open
Stripped-envelope supernovae (SESNe) mark the deaths of massive stars without hydrogen-rich envelopes. Most SESNe likely originate from binary systems where a companion stripped the progenitor of its envelope. Years of HST imaging of nearb…
View article: The undetectable fraction of core-collapse supernovae in luminous infrared galaxies
The undetectable fraction of core-collapse supernovae in luminous infrared galaxies Open
Context. A large fraction of core-collapse supernovae (CCSNe) in luminous infrared galaxies (LIRGs) remain undetected due to extremely high line-of-sight host galaxy dust extinction and a strong contrast between the SN and the galaxy backg…
View article: An investigation into correlations between FRB and host galaxy properties
An investigation into correlations between FRB and host galaxy properties Open
Impulsive radio signals such as fast radio bursts (FRBs) are imprinted with the signatures of multi-path propagation through ionised media in the form of frequency-dependent temporal broadening of the pulse profile (scattering). The domina…
View article: The Low Mass Dwarf Host Galaxy of Non-Repeating FRB 20230708A
The Low Mass Dwarf Host Galaxy of Non-Repeating FRB 20230708A Open
We present Very Large Telescope/X-Shooter spectroscopy for the host galaxies of 12 fast radio bursts (FRBs) detected by the Australian SKA Pathfinder (ASKAP) observed through the ESO Large Programme "FURBY", which imposes strict selection …
View article: The Magnetic Keys to Massive Star Formation: The Western <i>η</i> Carinae Giant Molecular Cloud
The Magnetic Keys to Massive Star Formation: The Western <i>η</i> Carinae Giant Molecular Cloud Open
We present SOFIA/HAWC+ continuum polarization data on the magnetic fields ( B fields) threading 17 pc-scale massive molecular clumps at the western end of the η Carinae giant molecular cloud (Region 9 of the Galactic Census of High- and Me…
View article: Empirical estimation of host galaxy dispersion measure toward well-localized fast radio bursts
Empirical estimation of host galaxy dispersion measure toward well-localized fast radio bursts Open
Context. Fast radio bursts (FRBs) are very energetic pulses in the radio wavelengths that have an unknown physical origin. They can be used to study the intergalactic medium thanks to their dispersion measure (DM). The DM has several contr…
View article: The radio re-brightening of the Type IIb SN 2001ig
The radio re-brightening of the Type IIb SN 2001ig Open
We study the late-time evolution of the compact Type IIb SN 2001ig in the spiral galaxy NGC 7424, with new and unpublished archival data from the Australia Telescope Compact Array and the Australian Square Kilometre Array Pathfinder. More …
View article: Empirical estimation of host galaxy dispersion measure towards well localized fast radio bursts
Empirical estimation of host galaxy dispersion measure towards well localized fast radio bursts Open
Fast radio bursts (FRBs) are very energetic pulses of unknown physical origin. These can be used to study the intergalactic medium (IGM) thanks to their dispersion measure (DM). The DM has several contributions that can be measured (or est…
View article: The fast radio burst population energy distribution
The fast radio burst population energy distribution Open
We examine the energy distribution of the fast radio burst (FRB) population using a well-defined sample of 63 FRBs from the Australian Square Kilometre Array Pathfinder (ASKAP) radio telescope, 28 of which are localised to a host galaxy. W…
View article: The radio re-brightening of the Type IIb SN 2001ig
The radio re-brightening of the Type IIb SN 2001ig Open
We study the late-time evolution of the compact Type IIb SN 2001ig in the spiral galaxy NGC 7424, with new and unpublished archival data from the Australia Telescope Compact Array and the Australian Square Kilometre Array Pathfinder. More …
View article: An investigation into correlations between FRB and host galaxy properties
An investigation into correlations between FRB and host galaxy properties Open
Impulsive radio signals such as fast radio bursts (FRBs) are imprinted with the signatures of multi-path propagation through ionised media in the form of frequency-dependent temporal broadening of the pulse profile, commonly referred to as…
View article: Modelling DSA, FAST, and CRAFT surveys in a <i>z</i>-DM analysis and constraining a minimum FRB energy
Modelling DSA, FAST, and CRAFT surveys in a <i>z</i>-DM analysis and constraining a minimum FRB energy Open
Fast radio burst (FRB) science primarily revolves around two facets: the origin of these bursts and their use in cosmological studies. This work follows from previous redshift–dispersion measure ( z –DM) analyses in which we model instrume…
View article: FRB 20230708A, a quasi-periodic FRB with unique temporal-polarimetric morphology
FRB 20230708A, a quasi-periodic FRB with unique temporal-polarimetric morphology Open
There has been a rapid increase in the known fast radio burst (FRB) population, yet the progenitor(s) of these events have remained an enigma. A small number of FRBs have displayed some level of quasi-periodicity in their burst profile, wh…
View article: FRB 20230708A, a quasi-periodic FRB with unique temporal-polarimetric morphology
FRB 20230708A, a quasi-periodic FRB with unique temporal-polarimetric morphology Open
There has been a rapid increase in the known fast radio burst (FRB) population, yet the progenitor(s) of these events have remained an enigma. A small number of FRBs have displayed some level of quasi-periodicity in their burst profile, wh…
View article: Optical and near-infrared photometry of 94 type II supernovae from the Carnegie Supernova Project
Optical and near-infrared photometry of 94 type II supernovae from the Carnegie Supernova Project Open
Type II supernovae (SNeII) mark the endpoint in the lives of hydrogen-rich massive stars. Their large explosion energies and luminosities allow us to measure distances, metallicities, and star formation rates into the distant Universe. To …
View article: Optical and near-infrared photometry of 94 type II supernovae from the Carnegie Supernova Project
Optical and near-infrared photometry of 94 type II supernovae from the Carnegie Supernova Project Open
Context. Type II supernovae (SNe II) mark the endpoint in the lives of hydrogen-rich massive stars. Their large explosion energies and luminosities allow us to measure distances, metallicities, and star formation rates into the distant Uni…
View article: Late-time supernovae radio re-brightening in the VAST pilot survey
Late-time supernovae radio re-brightening in the VAST pilot survey Open
We present our analysis of supernovae serendipitously found to be radio-bright several years after their optical discovery. We used recent observations from the Australian SKA Pathfinder (ASKAP) taken as part of the pilot Variables and Slo…
View article: Late-Time Supernovae Radio Re-brightening in the VAST Pilot Survey
Late-Time Supernovae Radio Re-brightening in the VAST Pilot Survey Open
We present our analysis of supernovae serendipitously found to be radio-bright several years after their optical discovery. We used recent observations from the Australian SKA Pathfinder taken as part of the pilot Variables and Slow Transi…
View article: The Environments of Fast Radio Bursts Viewed Using Adaptive Optics
The Environments of Fast Radio Bursts Viewed Using Adaptive Optics Open
We present observations from the Gemini Multi-Conjugate Adaptive Optics System/Gemini South Adaptive Optics Imager at Gemini South of five fast radio burst (FRB) host galaxies of FRBs with subarcsecond localizations. We examine and quantif…
View article: The Fast Radio Burst Population Energy Distribution
The Fast Radio Burst Population Energy Distribution Open
We examine the energy distribution of the fast radio burst (FRB) population using a well-defined sample of 63 FRBs from the ASKAP radio telescope, 28 of which are localised to a host galaxy. We apply the luminosity-volume ($V/V_{\mathrm{ma…
View article: The Curious Case of Twin Fast Radio Bursts: Evidence for Neutron Star Origin?
The Curious Case of Twin Fast Radio Bursts: Evidence for Neutron Star Origin? Open
Fast radio bursts (FRBs) are brilliant short-duration flashes of radio emission originating at cosmological distances. The vast diversity in the properties of currently known FRBs and the fleeting nature of these events make it difficult t…
View article: Carnegie Supernova Project I and II: Measurements of H <sub>0</sub> Using Cepheid, Tip of the Red Giant Branch, and Surface Brightness Fluctuation Distance Calibration to Type Ia Supernovae*
Carnegie Supernova Project I and II: Measurements of H <sub>0</sub> Using Cepheid, Tip of the Red Giant Branch, and Surface Brightness Fluctuation Distance Calibration to Type Ia Supernovae* Open
We present an analysis of Type Ia supernovae (SNe Ia) from the Carnegie Supernova Project I and II and extend the Hubble diagram from optical to near-infrared wavelengths ( uBgVriYJH ). We calculate the Hubble constant, H 0 , using various…
View article: Optical Spectroscopy of Type Ia Supernovae by the Carnegie Supernova Projects I and II
Optical Spectroscopy of Type Ia Supernovae by the Carnegie Supernova Projects I and II Open
We present the second and final release of optical spectroscopy of Type Ia supernovae (SNe Ia) obtained during the first and second phases of the Carnegie Supernova Project (CSP-I and CSP-II). The newly released data consist of 148 spectra…
View article: Measuring the Variance of the Macquart Relation in Redshift–Extragalactic Dispersion Measure Modeling
Measuring the Variance of the Macquart Relation in Redshift–Extragalactic Dispersion Measure Modeling Open
The Macquart relation describes the correlation between the dispersion measure (DM) of fast radio bursts (FRBs) and the redshift z of their host galaxies. The scatter of the Macquart relation is sensitive to the distribution of baryons in …