A5040588942- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Advanced Fiber Optic Sensors
- CCD and CMOS Imaging Sensors
- Adaptive optics and wavefront sensing
- Optical Network Technologies
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Semiconductor Lasers and Optical Devices
- Infrared Target Detection Methodologies
- Optical Wireless Communication Technologies
- Cosmology and Gravitation Theories
- History and Developments in Astronomy
- Photonic and Optical Devices
- Photocathodes and Microchannel Plates
- Spectroscopy Techniques in Biomedical and Chemical Research
- Planetary Science and Exploration
- Particle accelerators and beam dynamics
- Calibration and Measurement Techniques
- Photonic Crystal and Fiber Optics
- Inertial Sensor and Navigation
- Advanced Optical Sensing Technologies
Herzberg Institute of Astrophysics
2023-2024
University of Toronto
2024
University of Florida
2018-2022
This paper provides a catalogue of stars, quasars, and galaxies for the Southern Photometric Local Universe Survey Data Release 2 (S-PLUS DR2) in Stripe 82 region. We show that 12-band filter system (5 Sloan-like 7 narrow bands) allows better performance object classification than usual analysis based solely on broad bands (regardless infrared information). Moreover, we our is robust against missing values. Using spectroscopically confirmed sources retrieved from Sloan Digital Sky DR16...
The Dharma Planet Survey (DPS) aims to monitor about 150 nearby very bright FGKM dwarfs (within 50 pc) during 2016–2020 for low-mass planet detection and characterization using the TOU high resolution optical spectrograph (|$R \approx 100\, 000$|, 380–900 nm). was initially mounted 2-m Automatic Spectroscopic Telescope at Fairborn Observatory in 2013–2015 conduct a pilot survey, then moved dedicated 50-inch automatic telescope on Mt. Lemmon 2016 launch survey. Here, we report first from...
We present results from end-to-end simulations of observations designed to constrain the rate change in expansion history Universe using redshift drift Lyman-$\alpha$ forest absorption lines along lines-of-sight toward bright quasars. For our we take extracted Keck/HIRES spectra quasars at $z>3$, and compare these real quasar with mock generated via Monte Carlo realizations. use assess potential for a dedicated observatory detect drift, quantify telescope spectrograph requirements...
We propose an experiment, the Cosmic Accelerometer, designed to yield velocity precision of $\leq 1$ cm/s with measurement stability over years decades. The first-phase which is at scale Astro2020 Small programs, will be ideal for radial measurements terrestrial exoplanets in Habitable Zone Sun-like stars. At same time, this experiment serve as technical pathfinder and facility core a second-phase larger Medium scale, can provide significant detection cosmological redshift drift on 6-year...
The PolyOculus technology produces large-area-equivalent telescopes by using fiber optics to link modules of multiple semi-autonomous, small, inexpensive, commercial-off-the-shelf telescopes. Crucially, this scalable design has construction costs that are <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mo>></mml:mo> </mml:mrow> <mml:mspace width="negativethinmathspace"/> <mml:mn>10</mml:mn> <mml:mo>×</mml:mo> </mml:math>...
Astronomy-grade cameras with robust performance and heritage in the space environment have long been costly, substantially limiting capacity for space-based astronomy creating a resource barrier to access. Additionally, ultraviolet observations historically limited by low-sensitivity of most sensors this wavelength range. The LUVCam program is designed address both issues, providing high-performance, low-cost, UV/optical camera system sufficiently capable support wide-array missions....
Modern scientific complementary metal-oxide semiconductor (sCMOS) detectors provide a highly competitive alternative to charge-coupled devices (CCDs), the latter of which have historically been dominant in optical imaging. sCMOS boast comparable performances CCDs with faster frame rates, lower read noise, and higher dynamic range. Furthermore, their production costs are shifting industry abandon CCD support favour CMOS, making characterization urgent. In this work, we characterized variety...
High sensitivity spectroscopy of astronomical targets is used for determining stellar radial velocities, exoplanet detection, and even atmosphere sensing. However, high resolution spectrographs are bulky, highly complex expensive instruments. While this bulk optical approach versatile, fiber optic photonic instruments can be lower cost, more compact, simpler to parallelize multiple targets. Here we present a low-cost fiber-based correlation technique which simultaneously measuring velocity...
Nearly a century after the discovery that we live in an expanding Universe, and two decades of accelerating cosmic expansion, there remains no direct detection this acceleration via redshift drift - change cosmological expansion velocity versus time. Because directly determines Hubble parameter H(z), it is arguably cleanest possible measurement history, has potential to constrain dark energy models (e.g. Kim et al. 2015). The challenge signal small best observational constraint presently...
As astronomy moves into the era of large-scale time-domain surveys, we are seeing a flood new transient and variable sources which will reach biblical proportions with advent LSST. A key strategic challenge for in this is lack suitable spectroscopic followup facilities. In response to need, have developed PolyOculus approach producing large-area-equivalent telescopes by using fiber optics link modules multiple semi-autonomous, small, inexpensive, commercial-off-the-shelf telescopes....
We report the discovery and confirmation of a bright quasi-stellar object (QSO), 2MASS J13260399+7023462, at $z=2.889$. This QSO is first spectroscopically confirmed candidate from an ongoing search using combination Gaia WISE photometry to identify QSOs $z>2$, redshift regime for which Lyman-$\alpha$ forest accessible with ground-based facilities. With apparent magnitude $G=16.07$, J13260399+7023462 one brightest known only 15 currently brighter QSOs. Given its inferred $M_{1450,AB}$...
Abstract We present a machine learning methodology to separate quasars from galaxies and stars using data S-PLUS in the Stripe-82 region. In terms of quasar classification, we achieved 95.49% for precision 95.26% recall Random Forest algorithm. For photometric redshift estimation, obtained 6% k-Nearest Neighbour.
The PolyOculus technology, developed by CREOL's Astrophonics group, creates a large-area-equivalent telescope using fiber optics and photonic lantern to link several semi-autonomous, small, inexpensive, commercial-off-theshelf telescopes. Original Array, OPA, will use seven, Celestron 11" telescopes with iOptron centralbalanced equatorial mounts (CEM 70) create ~0.75m equivalent optical for spectroscopic follow up observations of astronomical events. This array include 7 acquisition guiding...