A5033977248- Stellar, planetary, and galactic studies
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- History and Developments in Astronomy
- Optical Network Technologies
- Optical Systems and Laser Technology
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Galaxies: Formation, Evolution, Phenomena
- Optical Coherence Tomography Applications
- Astrophysical Phenomena and Observations
- Scientific Research and Discoveries
- Optical Wireless Communication Technologies
- Neural Networks and Reservoir Computing
- Pulsars and Gravitational Waves Research
The University of Sydney
2021-2024
University of California, Irvine
2024
European Southern Observatory
2024
Isolated black holes (BHs) and neutron stars (NSs) are largely undetectable across the electromagnetic spectrum. For this reason, our only real prospect of observing these isolated compact remnants is via microlensing; a feat recently performed for first time. However, characterisation microlensing events caused by BHs NSs still in its infancy. In work, we perform N-body simulations to explore frequency physical characteristics entire sky. Our find that every year can expect $88_{-6}^{+6}$...
ABSTRACT We chart the expected Galactic distribution of neutron stars and black holes. These compact remnants dead – underworld are found to exhibit a fundamentally different structure visible Galaxy. Compared Galaxy, concentration into thin flattened disc is much less evident with scale height more than tripling 1260 ± 30 pc. This difference arises from two primary causes. First, in part inherited integration over evolving Galaxy itself (and hence changing parent stars). Secondly, an even...
Abstract The pyramid wave front sensor (PyWFS) has become increasingly popular to use in adaptive optics (AO) systems due its high sensitivity. main drawback of the PyWFS is that it inherently nonlinear, which means classic linear reconstruction techniques face a significant reduction performance at errors, particularly when unmodulated. In this paper, we consider potential neural networks (NNs) replace widely used matrix vector multiplication (MVM) control. We aim test hypothesis NN's...
Integrated-optic components are being increasingly used in astrophysics, mainly where accuracy and precision paramount. One such emerging technology is nulling interferometry that targets high contrast angular resolution. Two of the most critical limitations encountered by nullers rapid phase fluctuations incoming light causing instability interference chromaticity directional couplers prevent a deep broadband interferometric null. We explore use tricoupler designed ultrafast laser...
Photonic lanterns (PLs) allow the decomposition of highly multimodal light into a simplified modal basis such as single-moded and/or few-moded. They are increasingly finding uses in astronomy, optics, and telecommunications. Calculating propagation through PL using traditional algorithms takes ∼1 h per simulation on modern CPU. We demonstrate that neural networks can bridge disparate opto-electronic systems and, when trained, achieve speedup over five orders magnitude. show this approach be...
Abstract This research note addresses a bug in the Gaia functionality of astroquery Python package. The bug, which results sources catalog not being returned, affects Gaia.query_object() and Gaia.query_object_async() functions. These rely on deprecated ADQL BOX function if width or height are specified. functions used published as such could affect peer-reviewed results. We advise any researchers using these to instead use Gaia.cone_search() counterparts Gaia.launch_job() helpdesk have been...
ABSTRACT Isolated black holes (BHs) and neutron stars (NSs) are largely undetectable across the electromagnetic spectrum. For this reason, our only real prospect of observing these isolated compact remnants is via microlensing; a feat recently performed for first time. However, characterization microlensing events caused by BHs NSs still in its infancy. In work, we perform N-body simulations to explore frequency physical characteristics entire sky. Our find that every year can expect...
Nulling interferometry is a promising technology to enable prospecting for and characterising sub-stellar companions at extremely close separations high contrasts. The most scientifically rewarding observations will require well corrected wavefronts in order deliver consistent, deep nulls that suppress the flux from central star. We present two stage system whose first deploys hybrid mode-selective photonic lantern optimally inject starlight into single mode fibre. Starlight does not couple...
Gravitationally lensed quasars are important objects in astronomy for probing the universe. Unfortunately, these exceedingly rare, occurring only ∼ 1/10 000 quasars. The challenge is to find amongst large astronomical data sets. In contrast previous attempts, which have made use of numeric data, we perform semi-supervised classification based on images These low resolution and noisy, but enough experienced astronomers classification. Using virtual adversarial training take advantage millions...
The pyramid wavefront sensor (PyWFS) has become increasingly popular to use in adaptive optics (AO) systems due its high sensitivity. main drawback of the PyWFS is that it inherently nonlinear, which means classic linear reconstruction techniques face a significant reduction performance at errors, particularly when unmodulated. In this paper, we consider potential neural networks (NNs) replace widely used matrix vector multiplication (MVM) control. We aim test hypothesis network (NN)'s...