A5090750649- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Space Exploration and Technology
- Planetary Science and Exploration
- Galaxies: Formation, Evolution, Phenomena
- Spectroscopy and Chemometric Analyses
Herzberg Institute of Astrophysics
2017-2021
University of Victoria
2017-2021
Queen's University
2017
The Canada-France Imaging Survey (CFIS) will map the northern high Galactic latitude sky in $u$-band ("CFIS-u", 10,000$\, {\rm deg^2}$) and $r$-band ("CFIS-r", 5,000$\, deg^2}$), enabling a host of stand-alone science investigations, providing some ground-based data necessary for photometric redshift determination Euclid mission. In this first contribution we present component survey, describe observational strategy, discuss highlight results, based on approximately one third final area. We...
We present the results of a 3-year long, medium-resolution spectroscopic campaign aimed at identifying very metal-poor stars from candidates selected with CaHK, metallicity-sensitive Pristine survey. The catalogue consists total 1007 stars, and includes 146 rediscoveries already presented in previous surveys, 707 new [Fe/H] < -2.0, 95 extremely -3.0. provide for every star catalogue, [C/Fe] measurements subset (10% -3 24% -2) which carbon determination is possible, contingent mainly on...
We present the stellar density profile of outer halo Galaxy traced over a range Galactocentric radii in 15 < RGC 220 kpc by blue horizontal branch (BHB) stars. These stars are identified photometrically using deep u-band imaging from new Canada–France Imaging Survey (CFIS) that reaches 24.5 mag. This is combined with griz bands Pan-STARRS 1 and covers total ∼4000 deg2 northern sky. method to select BHB has low contamination stragglers high completeness. use this sample measure parametrize...
As the remnants of stars with initial masses $\lesssim$ 8 M$_{\odot}$, white dwarfs contain valuable information on formation histories stellar populations. In this paper, we use deep, high-quality, u-band photometry from Canada France Imaging Survey (CFIS), griz Pan-STARRS 1 (PS1), as well proper motions Gaia DR2, to select 25,156 dwarf candidates over $\sim$4500 deg$^2$ using a reduced motion diagram. We develop new population synthesis code that returns mock observations Galactic field...
We present the chemical distribution of Milky Way, based on 2,900$\, {\rm deg^2}$ $u$-band photometry taken as part Canada-France Imaging Survey. When complete, this survey will cover 10,000$\, Northern sky. By combing CFHT together with SDSS and Pan-STARRS $g,r,$ $i$, we demonstrate that are able to measure reliably metallicities individual stars $\sim 0.2$ dex, hence additionally obtain good photometric distance estimates. This thus permits measurement distances dominant main-sequence...
Abstract We present a new fully data-driven algorithm that uses photometric data from the Canada–France Imaging Survey (CFIS; u ), Pan-STARRS 1 (PS1; griz and Gaia ( G ) to discriminate between dwarf giant stars estimate their distances metallicities. The is trained tested using Sloan Digital Sky (SDSS)/SEGUE spectroscopic set photometric/astrometric set. At [Fe/H] < −1.2, succeeds in identifying more than 70% of giants training/test set, with contamination fraction below 30% (with...
Abstract With the imminent start of Legacy Survey for Space and Time (LSST) at Vera C. Rubin Observatory several new space telescopes expected to begin operations later in this decade, both time-domain wide-field astronomy are on threshold a era. In paper, we use multicomponent model distribution white dwarfs (WDs) our Galaxy simulate WD populations four upcoming surveys (i.e., LSST, Euclid, Roman Telescope, Cosmological Advanced Telescope Optical uv Research) resulting samples explore some...
Abstract We present optical spectroscopy for 18 halo white dwarfs identified using photometry from the Canada–France Imaging Survey and Pan-STARRS1 DR1 3 π survey combined with astrometry Gaia DR2. The sample contains 13 DA, 1 DZ, 2 DC, potentially exotic types of dwarf. fit both spectrum spectral energy distribution in order to obtain temperature surface gravity, which we then convert into mass age stellar isochrones initial-to-final relation. find a large spread ages that is not consistent...
Abstract We use three different techniques to identify hundreds of white dwarf (WD) candidates in the Next Generation Virgo Cluster Survey (NGVS) based on photometry from NGVS and GUViCS, proper motions derived Sloan Digital Sky (SDSS). Photometric distances for these are calculated using theoretical color–absolute magnitude relations, while effective temperatures measured by fitting their spectral energy distributions. Disk halo WD separated a tangential velocity cut 200 km s −1 reduced...
With the imminent start of Legacy Survey for Space and Time (LSST) on Vera C. Rubin Observatory, several new space telescopes expected to begin operations later in this decade, both time domain wide-field astronomy are threshold a era. In paper, we use new, multi-component model distribution white dwarfs (WDs) our Galaxy simulate WD populations four upcoming surveys (i.e., LSST, Euclid, Roman Telescope CASTOR) resulting samples explore some representative science cases. Our results confirm...