A. Mahabal
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View article: Optically Overluminous Tidal Disruption Events: Outflow Properties and Implications for Extremely Relativistic Disruptions
Optically Overluminous Tidal Disruption Events: Outflow Properties and Implications for Extremely Relativistic Disruptions Open
Recent studies suggest that tidal disruption events (TDEs) with off-axis jets may manifest as optically overluminous events. To search for jet signatures at late times, we conducted radio observations of eight such optically overluminous (…
View article: An extremely luminous flare recorded from a supermassive black hole
An extremely luminous flare recorded from a supermassive black hole Open
View article: Deconvolution for Large Astronomical Surveys: A Study of the Scaled Gradient Projection Method on Zwicky Transient Facility Data
Deconvolution for Large Astronomical Surveys: A Study of the Scaled Gradient Projection Method on Zwicky Transient Facility Data Open
Ground-based astronomical observations will continue to produce resolution-limited images due to atmospheric seeing. Deconvolution reverses such effects and thus can benefit extracted science in multifaceted ways. We apply the Scaled Gradi…
View article: BOOM and Babamul: a real-time, multi-survey, optical alert broker system operating at scale
BOOM and Babamul: a real-time, multi-survey, optical alert broker system operating at scale Open
With the arrival of ever higher throughput wide-field surveys and a multitude of multi-messenger and multi-wavelength instruments to complement them, software capable of harnessing these associated data streams is urgently required. To mee…
View article: Deconvolution for Large Astronomical Surveys: A Study of the Scaled Gradient Projection Method on Zwicky Transient Facility Data
Deconvolution for Large Astronomical Surveys: A Study of the Scaled Gradient Projection Method on Zwicky Transient Facility Data Open
Ground-based astronomical observations will continue to produce resolution-limited images due to atmospheric seeing. Deconvolution reverses such effects and thus can benefit extracted science in multifaceted ways. We apply the Scaled Gradi…
View article: OpenUniverse2024: A shared, simulated view of the sky for the next generation of cosmological surveys
OpenUniverse2024: A shared, simulated view of the sky for the next generation of cosmological surveys Open
The OpenUniverse2024 simulation suite is a cross-collaboration effort to produce matched simulated imaging for multiple surveys as they would observe a common simulated sky. Both the simulated data and associated tools used to produce it a…
View article: GWSkyNet-Multi. II. An Updated Machine Learning Model for Rapid Classification of Gravitational-wave Events
GWSkyNet-Multi. II. An Updated Machine Learning Model for Rapid Classification of Gravitational-wave Events Open
Multimessenger observations of gravitational waves and electromagnetic emission from compact object mergers offer unique insights into the structure of neutron stars, the formation of heavy elements, and the expansion rate of the Universe.…
View article: QZO: A Catalog of 5 Million Quasars from the Zwicky Transient Facility
QZO: A Catalog of 5 Million Quasars from the Zwicky Transient Facility Open
Machine learning methods are well established in the classification of quasars (QSOs). However, the advent of light-curve observations adds a great amount of complexity to the problem. Our goal is to use the Zwicky Transient Facility (ZTF)…
View article: Spectroscopic classification of extragalactic transients from CRTS
Spectroscopic classification of extragalactic transients from CRTS Open
The Catalina Real-time Transient Survey (CRTS) carried out a public survey for optical transients between 2007 and 2019, discovering more than 16 000 transient candidates. Here, we present the spectra and highlight the results of the spect…
View article: A Machine Learning Approach to Surveying Solar Energetic Particle Time Profiles
A Machine Learning Approach to Surveying Solar Energetic Particle Time Profiles Open
View article: A machine-learning empowered search for sub-minute optical transient events with the <i>Deeper, Wider, Faster</i> programme
A machine-learning empowered search for sub-minute optical transient events with the <i>Deeper, Wider, Faster</i> programme Open
Optical transient surveys continue to generate increasingly large data sets, prompting the introduction of machine-learning algorithms to search for quality transient candidates efficiently. Existing machine-learning infrastructure can be …
View article: Low-latency Forecasts of Kilonova Light Curves for Rubin and ZTF
Low-latency Forecasts of Kilonova Light Curves for Rubin and ZTF Open
Follow-up of gravitational-wave events by wide-field surveys is a crucial tool for the discovery of electromagnetic counterparts to gravitational wave sources, such as kilonovae. Machine learning tools can play an important role in aiding …
View article: PKS J0805-0111: A Second Owens Valley Radio Observatory Blazar Showing Highly Significant Sinusoidal Radio Variability—The Tip of the Iceberg
PKS J0805-0111: A Second Owens Valley Radio Observatory Blazar Showing Highly Significant Sinusoidal Radio Variability—The Tip of the Iceberg Open
Owens Valley Radio Observatory observations of the supermassive black hole binary (SMBHB) candidate PKS 2131−021 revealed, for the first time, six likely characteristics of the phenomenology exhibited by SMBHBs in blazars, of which the mos…
View article: Inferring CSM properties of Type II SNe using a magnitude-limited ZTF sample
Inferring CSM properties of Type II SNe using a magnitude-limited ZTF sample Open
Although all Type II supernovae (SNe) originate from massive stars possessing a hydrogen-rich envelope, their light-curve morphology is diverse, reflecting poorly characterized heterogeneity in the physical properties of their progenitor s…
View article: Eclipsing white dwarf from the Zwicky Transient Facility: II. Seven eclipsing double white dwarfs
Eclipsing white dwarf from the Zwicky Transient Facility: II. Seven eclipsing double white dwarfs Open
In a systematic search for eclipsing white dwarfs using Zwicky transient facility (ZTF) data, we found seven eclipsing double white dwarfs with orbital periods ranging from 45 minutes to 3 hours. We collected high-speed light curves, archi…
View article: Deep Learning–Based Artificial Intelligence Algorithm to Classify Tremors from Hand‐Drawn Spirals
Deep Learning–Based Artificial Intelligence Algorithm to Classify Tremors from Hand‐Drawn Spirals Open
Background No objective biomarkers exist for diagnosing and classifying tremor syndromes. Objective The aim was to develop and validate a deep learning (DL) algorithm for classifying tremors from hand‐drawn pen‐on‐paper spirals. Methods We…
View article: CCSNscore: A Multi-input Deep Learning Tool for Classification of Core-collapse Supernovae Using SED-machine Spectra
CCSNscore: A Multi-input Deep Learning Tool for Classification of Core-collapse Supernovae Using SED-machine Spectra Open
Supernovae (SNe) come in various flavors and are classified into different types based on emission and absorption lines in their spectra. SN candidates are now abundant with the advent of large systematic sky surveys like the Zwicky Transi…
View article: QZO: A Catalog of 5 Million Quasars from the Zwicky Transient Facility
QZO: A Catalog of 5 Million Quasars from the Zwicky Transient Facility Open
Machine learning methods are well established in the classification of quasars (QSOs). However, the advent of light curve observations adds a great amount of complexity to the problem. Our goal is to use the Zwicky Transient Facility (ZTF)…
View article: GWSkyNet-Multi II: an updated deep learning model for rapid classification of gravitational-wave events
GWSkyNet-Multi II: an updated deep learning model for rapid classification of gravitational-wave events Open
Multi-messenger observations of gravitational waves and electromagnetic emission from compact object mergers offer unique insights into the structure of neutron stars, the formation of heavy elements, and the expansion rate of the Universe…
View article: Cyclotron emitting magnetic white dwarfs in post common envelope binaries discovered with the Zwicky Transient Facility
Cyclotron emitting magnetic white dwarfs in post common envelope binaries discovered with the Zwicky Transient Facility Open
We present the discovery of 14 new (and recovery of 4 known) low accretion rate magnetic white dwarfs in post-common envelope binaries that emit strong cyclotron emission using the Zwicky Transient Facility (ZTF) light curves, doubling the…
View article: CCSNscore: A multi-input deep learning tool for classification of core-collapse supernovae using SED-Machine spectra
CCSNscore: A multi-input deep learning tool for classification of core-collapse supernovae using SED-Machine spectra Open
Supernovae (SNe) come in various flavors and are classified into different types based on emission and absorption lines in their spectra. SN candidates are now abundant with the advent of large systematic sky surveys like the Zwicky Transi…
View article: Expanding the Ultracompacts: Gravitational-wave-driven Mass Transfer in the Shortest-period Binaries with Accretion Disks
Expanding the Ultracompacts: Gravitational-wave-driven Mass Transfer in the Shortest-period Binaries with Accretion Disks Open
We report the discovery of three ultracompact binary white dwarf systems hosting accretion disks, with orbital periods of 7.95, 8.68, and 13.15 minutes. This significantly augments the population of mass-transferring binaries at the shorte…
View article: Selfish Evolution: Making Discoveries in Extreme Label Noise with the Help of Overfitting Dynamics
Selfish Evolution: Making Discoveries in Extreme Label Noise with the Help of Overfitting Dynamics Open
Motivated by the scarcity of proper labels in an astrophysical application, we have developed a novel technique, called Selfish Evolution, which allows for the detection and correction of corrupted labels in a weakly supervised fashion. Un…
View article: Expanding the ultracompacts: gravitational wave-driven mass transfer in the shortest-period binaries with accretion disks
Expanding the ultracompacts: gravitational wave-driven mass transfer in the shortest-period binaries with accretion disks Open
We report the discovery of three ultracompact binary white dwarf systems hosting accretion disks, with orbital periods of 7.95, 8.68, and 13.15 minutes. This significantly augments the population of mass-transferring binaries at the shorte…
View article: Searching for Gravitational Wave Optical Counterparts with the Zwicky Transient Facility: Summary of O4a
Searching for Gravitational Wave Optical Counterparts with the Zwicky Transient Facility: Summary of O4a Open
During the first half of the fourth observing run (O4a) of the International Gravitational Wave Network, the Zwicky Transient Facility (ZTF) conducted a systematic search for kilonova (KN) counterparts to binary neutron star (BNS) and neut…
View article: Subrelativistic Outflow and Hours-timescale Large-amplitude X-Ray Dips during Super-Eddington Accretion onto a Low-mass Massive Black Hole in the Tidal Disruption Event AT2022lri
Subrelativistic Outflow and Hours-timescale Large-amplitude X-Ray Dips during Super-Eddington Accretion onto a Low-mass Massive Black Hole in the Tidal Disruption Event AT2022lri Open
We present the tidal disruption event (TDE) AT2022lri, hosted in a nearby (≈144 Mpc) quiescent galaxy with a low-mass massive black hole (10 4 M ⊙ < M BH < 10 6 M ⊙ ). AT2022lri belongs to the TDE-H+He subtype. More than 1 Ms of X-ray data…
View article: GWSkyNet. II. A Refined Machine-learning Pipeline for Real-time Classification of Public Gravitational Wave Alerts
GWSkyNet. II. A Refined Machine-learning Pipeline for Real-time Classification of Public Gravitational Wave Alerts Open
Electromagnetic follow-up observations of gravitational wave events offer critical insights and provide significant scientific gain from this new class of astrophysical transients. Accurate identification of gravitational wave candidates a…
View article: The Zwicky Transient Facility Bright Transient Survey. III. BTSbot: Automated Identification and Follow-up of Bright Transients with Deep Learning
The Zwicky Transient Facility Bright Transient Survey. III. BTSbot: Automated Identification and Follow-up of Bright Transients with Deep Learning Open
The Bright Transient Survey (BTS) aims to obtain a classification spectrum for all bright ( m peak ≤ 18.5 mag) extragalactic transients found in the Zwicky Transient Facility (ZTF) public survey. BTS critically relies on visual inspection …
View article: GWSkyNet II : a refined machine learning pipeline for real-time classification of public gravitational wave alerts
GWSkyNet II : a refined machine learning pipeline for real-time classification of public gravitational wave alerts Open
Electromagnetic follow-up observations of gravitational wave events offer critical insights and provide significant scientific gain from this new class of astrophysical transients. Accurate identification of gravitational wave candidates a…
View article: PKS~J0805$-$0111: A Second Owens Valley Radio Observatory Blazar Showing Highly Significant Sinusoidal Radio Variability -- The Tip of the Iceberg
PKS~J0805$-$0111: A Second Owens Valley Radio Observatory Blazar Showing Highly Significant Sinusoidal Radio Variability -- The Tip of the Iceberg Open
Owens Valley Radio Observatory (OVRO) observations of supermassive black hole binary (SMBHB) candidate PKS~2131$-$021 revealed, for the first time, six likely characteristics of the phenomenology exhibited by SMBHB in blazars, of which the…