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Using Neural Networks to Perform Rapid High-Dimensional Kilonova Parameter Inference
Mouza Almualla, Yuhong Ning, Pouyan Salehi +4
On the 17th of August, 2017 came the simultaneous detections of GW170817, a gravitational wave that originated from the coalescence of two neutron stars, along with the gamma-ray b…
An imaging polarimetry survey of Type Ia supernovae: are peculiar extinction and polarization properties produced by circumstellar or interstellar matter?
Matthew R. Chu, Aleksandar Cikota, Dietrich Baade +8
Some highly reddened Type Ia supernovae (SNe Ia) display low total-to-selective extinction ratios () in comparison to that of typical Milky Way dust ($R_V \approx 3…
Spectropolarimetry of the Type Ia SN 2019ein rules out significant global asphericity of the ejecta
Kishore C. Patra, Yi Yang, Thomas G. Brink +12
Detailed spectropolarimetric studies may hold the key to probing the explosion mechanisms and the progenitor scenarios of Type Ia supernovae (SNe Ia). We present multi-epoch spectr…
Data-driven expectations for electromagnetic counterpart searches based on LIGO/Virgo public alerts
Polina Petrov, Leo P. Singer, Michael W. Coughlin +7
Searches for electromagnetic counterparts of gravitational-wave signals have redoubled since the first detection in 2017 of a binary neutron star merger with a gamma-ray burst, opt…
Probing the Progenitors of Type Ia Supernovae using Circumstellar Material Interaction Signatures
Peter Clark, Kate Maguire, Mattia Bulla +4
This work aims to study different probes of Type Ia supernova progenitors that have been suggested to be linked to the presence of circumstellar material (CSM). In particular, we h…
Inferring kilonova population properties with a hierarchical Bayesian framework I : Non-detection methodology and single-event analyses
Siddharth R. Mohite, Priyadarshini Rajkumar, Shreya Anand +17
We present : a hierarchical Bayesian framework to infer the intrinsic luminosity parameters of kilonovae (KNe) associated with gravitational-wave (GW) events, based…
Constraining Neutron-Star Matter with Microscopic and Macroscopic Collisions
S. Huth, P. T. H. Pang, I. Tews +8
Interpreting high-energy, astrophysical phenomena, such as supernova explosions or neutron-star collisions, requires a robust understanding of matter at supranuclear densities. How…
Optimizing Cadences with Realistic Light Curve Filtering for Serendipitous Kilonova Discovery with Vera Rubin Observatory
Igor Andreoni, Michael W. Coughlin, Mouza Almualla +11
Current and future optical and near-infrared wide-field surveys have the potential of finding kilonovae, the optical and infrared counterparts to neutron star mergers, independentl…
Evidence for multiple origins of fast declining Type II supernovae from spectropolarimetry of SN 2013ej and SN 2017ahn
T. Nagao, F. Patat, S. Taubenberger +10
The origin of the diverse light-curve shapes of Type II supernovae (SNe), and whether they come from similar or distinct progenitors, has been actively discussed for decades. Here…
Discovery and confirmation of the shortest gamma ray burst from a collapsar
Tomas Ahumada, Leo P. Singer, Shreya Anand +54
Gamma-ray bursts (GRBs) are among the brightest and most energetic events in the universe. The duration and hardness distribution of GRBs has two clusters, now understood to reflec…
Nuclear-Physics Multi-Messenger Astrophysics Constraints on the Neutron-Star Equation of State: Adding NICER's PSR J0740+6620 Measurement
Peter T. H. Pang, Ingo Tews, Michael W. Coughlin +3
In the past few years, new observations of neutron stars and neutron-star mergers have provided a wealth of data that allow one to constrain the equation of state of nuclear matter…
Fast-transient Searches in Real Time with ZTFReST: Identification of Three Optically-discovered Gamma-ray Burst Afterglows and New Constraints on the Kilonova Rate
Igor Andreoni, Michael W. Coughlin, Erik C. Kool +32
While optical surveys regularly discover slow transients like supernovae on their own, the most common way to discover extragalactic fast transients, fading away in a few nights, i…
Predicting electromagnetic counterparts using low-latency, gravitational-wave data products
Cosmin Stachie, Michael W. Coughlin, Tim Dietrich +8
Searches for gravitational-wave counterparts have been going in earnest since GW170817 and the discovery of AT2017gfo. Since then, the lack of detection of other optical counterpar…
The Challenges Ahead for Multimessenger Analyses of Gravitational Waves and Kilonova: a Case Study on GW190425
Geert Raaijmakers, Samaya Nissanke, Francois Foucart +12
In recent years, there have been significant advances in multi-messenger astronomy due to the discovery of the first, and so far only confirmed, gravitational wave event with a sim…
Infrared Spectropolarimetric Detection of Intrinsic Polarization from a Core-Collapse Supernova
Samaporn Tinyanont, Maxwell Millar-Blanchaer, Mansi Kasliwal +8
Massive stars die an explosive death as a core-collapse supernova (CCSN). The exact physical processes that cause the collapsing star to rebound into an explosion are not well-unde…