A5030679825- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Astro and Planetary Science
- Seismology and Earthquake Studies
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- History and Developments in Astronomy
- Health and Medical Research Impacts
- Advanced Vision and Imaging
- GNSS positioning and interference
- Isotope Analysis in Ecology
- Seismic Waves and Analysis
- Cardiac Imaging and Diagnostics
- Optical Systems and Laser Technology
- Astronomy and Astrophysical Research
- High-pressure geophysics and materials
- Radio Astronomy Observations and Technology
- Geophysics and Gravity Measurements
- Adaptive optics and wavefront sensing
- Optical measurement and interference techniques
- Stellar, planetary, and galactic studies
- Advanced X-ray and CT Imaging
McGill University
2020-2024
Abstract Freshly synthesized r -process elements in kilonovae ejecta imprint absorption features on optical spectra, as observed the GW170817 binary neutron star merger. These spectral encode insights into physical conditions of and origins ejected material, but associating with particular inferring resultant abundance pattern is computationally challenging. We introduce Spectroscopic -Process Abundance Retrieval for Kilonovae ( SPARK ), a modular framework to perform Bayesian inference...
Abstract In kilonovae, freshly synthesized r -process elements imprint features on optical spectra, as observed in AT2017gfo, the counterpart to GW170817 binary neutron star merger. However, measuring compositions of merger ejecta is computationally challenging. Vieira et al. introduced Spectroscopic Abundance Retrieval for Kilonovae ( SPARK ), a software tool infer elemental abundance patterns and associate spectral with particular species. Previously, we applied 1.4-day spectrum AT2017gfo...
We present a wide-field optical imaging search for electromagnetic counterparts to the likely neutron star - black hole (NS-BH) merger GW190814/S190814bv. This compact binary was detected through gravitational waves by LIGO/Virgo interferometers, with masses suggestive of NS-BH merger. imaged localization region using MegaCam instrument on Canada-France-Hawaii Telescope. describe our hybrid observing strategy both tiling and galaxy-targeted observations, as well image differencing transient...
Abstract Kilonovae are likely a key site of heavy r -process element production in the Universe, and their optical/infrared spectra contain insights into both properties ejecta conditions -process. However, event GW170817/AT2017gfo is only kilonova so far with well-observed spectra. To understand diversity absorption features that might be observed future kilonovae spectra, we use TARDIS Monte Carlo radiative transfer code to simulate suite optical spanning wide range abundance patterns....
Abstract GWSkyNet-Multi is a machine learning model developed for the classification of candidate gravitational-wave events detected by LIGO and Virgo observatories. The uses limited information released in low-latency Open Public Alerts to produce prediction scores indicating whether an event merger two black holes (BHs), involving neutron star (NS), or non-astrophysical glitch. This facilitates time-sensitive decisions about perform electromagnetic follow-up during LIGO-Virgo-KAGRA (LVK)...
The spectral features in the optical/near-infrared counterparts of neutron star mergers (kilonovae, KNe) evolve dramatically on hourly timescales. To examine evolution, we compiled a temporal series that was complete at all observed epochs from 0.5 to 9.4 days best (NIR) spectra gravitational-wave detected kilonova AT2017gfo. Using our analysis this series, show emergence times place strong constraints line identifications and ejecta properties, while their subsequent evolution probes...
Abstract Compact object mergers which produce both detectable gravitational waves and electromagnetic (EM) emission can provide valuable insights into the neutron star equation of state, tension in Hubble constant, origin r -process elements. However, EM follow-up wave sources is complicated by false-positive detections, transient nature associated emission. GWSkyNet-Multi a machine learning model that attempts facilitate providing real-time predictions source detection. The uses information...
The spectral features in the optical/near-infrared counterparts of neutron star mergers (kilonovae, KNe), evolve dramatically on hour timescales. To examine evolution we compile a temporal series complete at all observed epochs from 0.5 to 9.4 days best (NIR) spectra gravitational-wave detected kilonova AT2017gfo. Using our analysis this series, show that emergence times place strong constraints line identifications and ejecta properties, while their subsequent probes structure ejecta. We...
Reflected light photometry of terrestrial exoplanets could reveal the presence oceans and continents, hence placing direct constraints on current long-term habitability these worlds. Inferring albedo map a planet from its observed curve is challenging because different maps may yield indistinguishable curves. This degeneracy aggravated by changing clouds. It has previously been suggested that disk-integrated spanning multiple days be combined to obtain cloud-free surface an exoplanet. We...
In kilonovae, freshly-synthesized $r$-process elements imprint features on optical spectra, as observed in AT2017gfo, the counterpart to GW170817 binary neutron star merger. However, measuring compositions of merger ejecta is computationally challenging. Vieira et al. (2023) introduced Spectroscopic $r$-Process Abundance Retrieval for Kilonovae (SPARK), a software tool infer elemental abundance patterns ejecta, and associate spectral with particular species. Previously, we applied SPARK 1.4...
GWSkyNet-Multi is a machine learning model developed for classification of candidate gravitational-wave events detected by the LIGO and Virgo observatories. The uses limited information released in low-latency Open Public Alerts to produce prediction scores indicating whether an event merger two black holes, involving neutron star, or non-astrophysical glitch. This facilitates time sensitive decisions about perform electromagnetic follow-up during LIGO-Virgo-KAGRA (LVK) observing runs....
Kilonovae are likely a key site of heavy r-process element production in the Universe, and their optical/infrared spectra contain insights into both properties ejecta conditions r-process. However, event GW170817/AT2017gfo is only kilonova so far with well-observed spectra. To understand diversity absorption features that might be observed future kilonovae spectra, we use TARDIS Monte Carlo radiative transfer code to simulate suite optical spanning wide range abundance patterns. identify...
Freshly-synthesized r-process elements in kilonovae ejecta imprint absorption features on optical spectra, as observed the GW170817 binary neutron star merger. These spectral encode insights into physical conditions of and origins ejected material, but associating with particular inferring resultant abundance pattern is computationally challenging. We introduce Spectroscopic r-Process Abundance Retrieval for Kilonovae (SPARK), a modular framework to perform Bayesian inference kilonova...