A5090032138- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Adaptive optics and wavefront sensing
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Calibration and Measurement Techniques
- Optical Wireless Communication Technologies
- Planetary Science and Exploration
- Optical Systems and Laser Technology
- CCD and CMOS Imaging Sensors
- Distributed and Parallel Computing Systems
- Gamma-ray bursts and supernovae
- Advanced optical system design
- Spacecraft Design and Technology
- Plant Water Relations and Carbon Dynamics
- Meteorological Phenomena and Simulations
- Space Exploration and Technology
- Infrared Target Detection Methodologies
- Solar and Space Plasma Dynamics
- Atmospheric aerosols and clouds
- Astrophysical Phenomena and Observations
- Inertial Sensor and Navigation
- Advanced Fiber Optic Sensors
- Scientific Research and Discoveries
Institute of Applied Physics
2024
Mohammed Bin Rashid School of Government
2018-2024
Kalasalingam Academy of Research and Education
2024
Heidelberg University
2000-2018
European Space Astronomy Centre
2010-2018
Gulf Heart Association
2018
Association of Electronic and Information Technologies
2010-2016
Heidelberg University
2014
Cerro Tololo Inter-American Observatory
2005-2012
TMT Observatory
2008-2012
Gaia is a cornerstone mission in the science programme of EuropeanSpace Agency (ESA). The spacecraft construction was approved 2006, following study which original interferometric concept changed to direct-imaging approach. Both and payload were built by European industry. involvement scientific community focusses on data processing for international Data Processing Analysis Consortium (DPAC) selected 2007. launched 19 December 2013 arrived at its operating point, second Lagrange point...
At about 1000 days after the launch of Gaia we present first data release, DR1, consisting astrometry and photometry for over 1 billion sources brighter than magnitude 20.7. We summarize DR1 provide illustrations scientific quality data, followed by a discussion limitations due to preliminary nature this release. consists of: primary astrometric set which contains positions, parallaxes, mean proper motions 2 million brightest stars in common with Hipparcos Tycho-2 catalogues secondary...
High-precision radial velocity (RV) measurements spanning the years 1980.8-2000.0 are presented for nearby (3.22 pc) K2 V star Eri. These data, which represent a combination of six independent data sets taken with four different telescopes, show convincing variations period ≈7 yr. A least-squares orbital solution using robust estimation yields parameters P = 6.9 yr, amplitude K 19 m s-1, eccentricity e 0.6, projected companion mass M sin i 0.86 MJupiter, and semimajor axis a2 3.4 AU. Ca II H...
Hubble Space Telescope (HST) observations of the nearby (3.22 pc) K2 V star Eridani have been combined with ground-based astrometric and radial velocity data to determine mass its known companion. We model measurements simultaneously obtain parallax, proper motion, perturbation period, inclination, size. Because long period companion, Eri b, we extend our coverage a total 14.94 yr (including 3 span HST data) by including lower precision astrometry from Allegheny Multichannel Astrometric...
Parallaxes for 331 classical Cepheids, 31 Type II Cepheids and 364 RR Lyrae stars in common between Gaia the Hipparcos Tycho-2 catalogues are published Data Release 1 (DR1) as part of Tycho-Gaia Astrometric Solution (TGAS). In order to test these first parallax measurements primary standard candles cosmological distance ladder, that involve astrometry collected by during initial 14 months science operation, we compared them with literature estimates derived new period-luminosity ($PL$),...
Context. The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a subset of about 2 million stars for which, besides position and photometry, proper motion parallax are calculated using Hipparcos Tycho-2 positions in 1991.25 as prior information. Aims. We investigate scientific potential limitations TGAS component by means astrometric data open clusters. Methods. Mean cluster values derived taking into account error correlations within solutions individual...
We report results from of high precision radial velocity monitoring Barnard's star. The RV measurement the VLT-UT2+UVES made following findings possible. (1) first detection change in a star caused by its space motion (RV secular acceleration). (2) An anti-correlation measured with strength filling-in line emission. (3) Very stringent mass upper limits to planetary companions. Using only data 2 years, we obtain best-fit value for acceleration . This agrees within predicted based on Hipparcos...
As part of the conceptual and preliminary design processes Thirty Meter Telescope (TMT), TMT site-testing team has spent last five years measuring atmospheric properties candidate mountains in North South America with an unprecedented array instrumentation. The period was preceded by several analyses selecting candidates: Cerros Tolar, Armazones Tolonchar northern Chile; San Pedro Mártir Baja California, Mexico; 13 (13N) site on Mauna Kea, Hawaii. Site testing concluded selection two...
In satellite communication systems, effective spectrum sensing and management are essential, especially in scenarios involving both geostationary Earth orbit (GEO) non-geostationary (NGEO) satellites. As the number of NGEO satellites increases, managing interference with GEO signals becomes more complex. This study introduces a machine learning (ML) framework for sensing, hole detection occupancy prediction based on data. The utilizes two ML models, support vector (SVM) random forest (RF),...
We report observations using the ESO adaptive optics system ADONIS of known extrasolar planetary Gliese 86. This star has a planet in 15.8 day orbit and exhibits an additional, large, long-period, radial velocity drift ([CITE]). The coronographic images reveal faint () object at projected distance . 86 discovered share same proper motion, as confirmed by independent measurements three different epochs indicating that this is gravitationally bound. From infrared colors magnitudes we infer...
In this article we present the results of planet search program carried out at ESO Coudé Echelle Spectrometer (CES) for components A and B α Centauri system. Since November 1992 have obtained high precision differential radial velocities (RVs) both stars. We demonstrate that, after subtraction binary orbital motion, no additional residual RV signal is within our detection limits, which could been attributed to giant planets orbiting either two performed numerical simulations determine...
The results of the characterization precipitable water vapor in atmospheric column carried out context identifying potential sites for deployment Thirty Meter Telescope (TMT) are presented. Prior to starting dedicated field campaign look a suitable site TMT, candidate were selected based on climatology report utilizing satellite data that considered as one study variables. These all tropical or subtropical location at geographic areas dominated by high-pressure systems. detailed on-site...
In this article we present an analysis of the statistical and temporal properties seeing isoplanatic angle measurements obtained with combined Differential Image Motion Monitor (DIMM) Multi-Aperture Scintillation Sensor (MASS) units at Thirty Meter Telescope (TMT) candidate sites. For each five sites multiyear, high-cadence, high-quality measurements. These data allow for a broad detailed analysis, giving us good understanding characteristics The overall statistics are presented, broken into...
The European Space Agency Gaia satellite was launched into orbit around L2 in December 2013. This ambitious mission has strict requirements on residual systematic errors resulting from instrumental corrections order to meet a design goal of sub-10 microarcsecond astrometry. During the and build phase science instruments, various critical calibrations were studied detail ensure that this could be met orbit. In particular, it determined video-chain offsets analogue side analogue-to-digital...
We present the complete results of planet search program carried out at ESO Coudé Echelle Spectrometer (CES) on La Silla, using Long Camera from Nov. 1992 to April 1998. The CES survey has monitored 37 late-type (F8V – M5V) stars in southern hemisphere for variations their differential radial velocities (RV) order detect Doppler reflex motions caused by planetary companions. This led discovery first extrasolar an Earth-like orbit around young (ZAMS) and active G0V star ι Horologii (Kürster...
The results on the vertical distribution of optical turbulence above five mountains which were investigated by site testing for Thirty Meter Telescope (TMT) are reported. On San Pedro Mártir in Mexico; 13 North Mauna Kea; and three northern Chile: Cerro Tolar, Armazones, Tolonchar; MASS-DIMM profilers have been operated over at least two years. Acoustic profilers—SODARs—were also these sites. obtained profiles indicate that all sites lowest 200 m main source total seeing observed, with...