A5053613581- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- High-pressure geophysics and materials
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Scientific Measurement and Uncertainty Evaluation
- History and Developments in Astronomy
- Particle Accelerators and Free-Electron Lasers
- Calibration and Measurement Techniques
- Radio Astronomy Observations and Technology
- Geophysics and Gravity Measurements
- Statistical and numerical algorithms
- Spectroscopy and Laser Applications
- Cosmology and Gravitation Theories
- Superconducting Materials and Applications
- Mechanics and Biomechanics Studies
- CCD and CMOS Imaging Sensors
University of St Andrews
2016-2025
St. Andrews University
1996-2024
Scottish Universities Physics Alliance
2005-2013
Sorbonne Université
2012
Centre National de la Recherche Scientifique
2012
Institut d'Astrophysique de Paris
2012
The Ohio State University
2011
University of Warsaw
2008
Carter Observatory
2008
Tel Aviv University
1996-2008
An optimal spectrum extraction procedure is described, and examples of its performance with CCD data are presented. The algorithm delivers the maximum possible signal-to-noise ratio while preserving spectrophotometric accuracy. effects moderate geometric distortion cosmic-ray hits on automatically accounted for. In tests background-noise limited spectra, offers a 70-percent gain in effective exposure time comparison conventional procedures.
The SuperWASP cameras are wide‐field imaging systems at the Observatorio del Roque de los Muchachos on island of La Palma in Canary Islands, and Sutherland Station South African Astronomical Observatory. Each instrument has a field view some 482 deg2 with an angular scale 13 7 pixel−1, is capable delivering photometry accuracy better than 1% for objects having V∼7.0–11.5. Lower quality data brighter V∼15.0 stored project archive. systems, while designed to monitor fields high cadence,...
In an earlier paper a method was presented for imaging the continuum light of accretion discs from curves their eclipses. this we present related making two-dimensional maps in emission lines observations line profiles as function binary phase. Reconstructions simulated datasets demonstrate potential method. The maximum entropy picks single image set allowed by statistical noise data. can accurately reproduce compact 'S'-waves produced asymmetric patterns and should be powerful tool...
The Telescopio Nazionale Galileo (TNG)[9] hosts, starting in April 2012, the visible spectrograph HARPS-N. It is based on design of its predecessor working at ESO's 3.6m telescope, achieving unprecedented results radial velocity measurements extrasolar planetary systems. spectrograph's ultra-stable environment, a temperature-controlled vacuum chamber, will allow under 1 m/s which enable characterization rocky, Earth-like planets. Enhancements from original HARPS include better scrambling...
We report on the discovery of WASP-12b, a new transiting extrasolar planet with $R_{\rm pl}=1.79 \pm 0.09 R_J$ and $M_{\rm pl}=1.41 0.1 M_J$. The host star properties were derived from Monte Carlo Markov Chain analysis transit photometry radial velocity data. Furthermore, by comparing stellar spectrum theoretical spectra evolution models, we determined that is super-solar metallicity ([M/H]$=0.3^{+0.05}_{-0.15}$), late-F (T$_{\rm eff}=6300^{+200}_{-100}$ K) which evolving off zero age main...
Searches for extrasolar planets have uncovered an astonishing diversity of planetary systems, yet the frequency solar system analogs remains unknown. The gravitational microlensing planet search method is potentially sensitive to multiple-planet systems containing all except Mercury. We report detection a with microlensing. identify two masses ∼0.71 and ∼0.27 times mass Jupiter orbital separations ∼2.3 ∼4.6 astronomical units orbiting primary star ∼0.50 at distance ∼1.5 kiloparsecs. This...
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not.The documents may come from teaching institutions in France abroad, public private centers.L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de scientifiques niveau recherche, publiés ou non, émanant des établissements d'enseignement recherche français étrangers, laboratoires publics privés.
The WASP (Wide Angle Search for Planets) project is an exoplanet transit survey that has been automatically taking wide field images since 2004. Two instruments, one in La Palma and the other South Africa, continually monitor night sky, building up light curves of millions unique objects. These are used to search characteristics exoplanetary transits. This first public data release (DR1) archive makes available all curve from 2004 2008 both Northern Southern hemispheres. A web interface...
We have detected low-amplitude radial-velocity variations in two stars, USNO-B1.0 1219-0005465 (GSC 02265-00107 = WASP-1) and 0964-0543604 00522-01199 WASP-2). Both stars were identified as being likely host of transiting exoplanets the 2004 SuperWASP wide-field transit survey. Using newly-commissioned spectrograph SOPHIE at Observatoire de Haute-Provence, we found that both objects exhibit reflex orbital with amplitudes characteristic planetary-mass companions in-phase photometric orbits....
We present a systematic search for changing-look quasars based on repeat photometry from Sloan Digital Sky Survey (SDSS) and Pan-STARRS1, along with spectra SDSS SDSS-III Baryon Oscillation Spectroscopic Survey. Objects large, |Δg| > 1 mag photometric variations in their light curves are selected as candidates to look changes broad emission line (BEL) features. Out of sample 1011 objects that satisfy our selection criteria have more than one epoch spectroscopy, we find 10 examples variable...
We present reverberation mapping results from the first year of combined spectroscopic and photometric observations Sloan Digital Sky Survey Reverberation Mapping Project. successfully recover time delays between $g+i$-band emission broad H$\beta$ line for a total 44 quasars, H$\alpha$ in 18 quasars. Time are computed using JAVELIN CREAM software traditional interpolated cross-correlation function (ICCF): Using well defined criteria, we report measurements 32 13 lags with JAVELIN, 42 17...
SDSS-V will be an all-sky, multi-epoch spectroscopic survey of over six million objects. It is designed to decode the history Milky Way, trace emergence chemical elements, reveal inner workings stars, and investigate origin planets. also create integral-field map gas in Galaxy Local Group that 1,000x larger than current state art at high enough spatial resolution self-regulation mechanisms galactic ecosystems. pioneer systematic, monitoring across whole sky, revealing changes on timescales...
Abstract We report the first unambiguous detection and mass measurement of an isolated stellar-mass black hole (BH). used Hubble Space Telescope (HST) to carry out precise astrometry source star long-duration ( t E ≃ 270 days), high-magnification microlensing event MOA-2011-BLG-191/OGLE-2011-BLG-0462 (hereafter designated as MOA-11-191/OGLE-11-462), in direction Galactic bulge. HST imaging, conducted at eight epochs over interval 6 yr, reveals a clear relativistic astrometric deflection...
Abstract We present the final data from Sloan Digital Sky Survey (SDSS) Reverberation Mapping (RM) project, a precursor to SDSS-V Black Hole Mapper RM program. This set includes 11 yr photometric and 7 spectroscopic light curves for 849 broad-line quasars over redshift range of 0.1 < z 4.5 luminosity L bol = 10 44−47.5 erg s −1 , along with spectral variability measurements. report 23, 81, 125, 110 lags (relative optical continuum variability) broad H α β Mg ii C iv using SDSS-RM sample,...
We describe a model‐independent method of assessing the uncertainties in cross‐correlation lags determined from light curves active galactic nuclei (AGNs) and use this to investigate reality between UV optical continuum variations well‐studied AGNs. Our results confirm existence such NGC 7469. find that at 1825, 4845, 6962 Å follow those 1315 by 0.22+0.12-0.13,1.25+0.48-0.35, 1.84+0.93-0.94 days, respectively, based on centroids functions; error intervals quoted correspond 68% confidence...
view Abstract Citations (418) References (43) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Radial Velocity Curve and Peculiar TiO Distribution of the Red Secondary Star in Z Chamaeleontis Wade, Richard A. ; Horne, Keith secondary star dwarf nova Cha has been detected with CCD spectrograph CTIO 4 m telescope. λ7150/λ7650 band ratio implies a Boeshaar spectral type M5.5 for star, which contributes ≡15% light at λ7500. absolute absorption strength is very...
We detect a Neptune mass ratio (q ≃ 8 × 10-5) planetary companion to the lens star in extremely high magnification (A ~ 800) microlensing event OGLE-2005-BLG-169. If parent is main-sequence star, it has M 0.5 M☉, implying planet of ~13 M⊕ and projected separation ~2.7 AU. When intensely monitored over their peak, high-magnification events similar OGLE-2005-BLG-169 have nearly complete sensitivity planets with separations 0.6-1.6 Einstein radii, corresponding 1.6-4.3 AU present case. Only two...
view Abstract Citations (378) References (39) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Ultraviolet Variability of NGC 5548: Dynamics the Continuum Production Region and Geometry Broad-Line Krolik, J. H. ; Horne, Keith Kallman, T. R. Malkan, M. A. Edelson, Kriss, G. We used data obtained in 1989-1990 IUE monitoring 5548 to derive a mean shape for ionizing spectrum; line profiles; continuum fluctuation power spectrum three UV bands; cross-correlation...
We examine the formation of emission lines from accretion discs and develop simple expressions for computing profiles both optically thin thick lines. The effect Keplerian velocity gradient on transfer line radiation in disc is taken into account to first order H/R. Line photons that are trapped an layer can escape more easily directions along which shear flow provides large Doppler gradients. This anisotropy local pattern alters shape global profile. present synthetic limits covering a full...
We report the discovery of a several-Jupiter-mass planetary companion to primary lens star in microlensing event OGLE-2005-BLG-071. Precise (≲1%) photometry at peak yields an extremely high signal-to-noise ratio detection deviation from light curve expected isolated lens. The character this is easily and unambiguously discernible gross features curve. Detailed modeling tightly constrained planet-star mass q = mp/M 0.0071 ± 0.0003. This second robust planet with microlensing, demonstrating...