Optical Gravitational Lensing Experiment
The Optical Gravitational Lensing Experiment is a Polish astronomical project based at the University of Warsaw that runs a long-term variability sky survey. Main goals are the detection and classification of variable stars, discoveries of the microlensing events, dwarf novae, studies of the Galaxy structure and the Magellanic Clouds. Since the project began in 1992, it has discovered multitude of extrasolar planets, together with a first planet discovered using transit method and gravitational microlensing method. The project from its inception is led by Prof. Andrzej Udalski.
Description
The main targets of the experiment are the Magellanic Clouds and the Galactic Bulge, because of the large number of intervening stars that can be used for microlensing during a stellar transit. Most of the observations have been made at the Las Campanas Observatory in Chile. Cooperating institutions include Princeton University and the Carnegie Institution.The project is now in its fourth phase. The first phase, OGLE-I used the 1.0 m Swope telescope and a single-chip CCD sensor. For OGLE-II, a 1.3 m telescope dedicated to the project was constructed at Las Campanas Observatory. It was equipped with a single 2048×2048 pixel sensor with a field of view 0.237 degrees wide. OGLE-III expanded the camera to a mosaic of eight 2048×4096 pixel CCDs, and was able to search for gravitational microlensing events and transiting planets in four fields: the Galactic Bulge, the constellation Carina, and toward both Magellanic Clouds. As a byproduct of the constant monitoring of hundreds of millions of stars, the largest catalogs of variable stars were constructed, and the first exoplanets discovered using the microlensing technique were detected. In 2010, following engineering work in 2009, the fourth and current phase, OGLE-IV, was started using a 32-chip mosaic CCD camera which fills the Warsaw telescope's 1.5° field of view. The main goal for this phase is to increase the number of planetary detections using microlensing, enabled by the new camera.
Recently the OGLE team, in cooperation with scientists mostly from USA, New Zealand and Japan, proved that small, Earth-like planets can exist at a significant distance from stars around which they revolve despite there being other stars near them.
Planets discovered
At least seventeen planets have so far been discovered by the OGLE project. Eight of the planets were discovered by the transit method and six by the gravitational microlensing method.Planets are shown in the order of discovery. Planets in multiple-planet systems are highlighted in yellow. Please note that list below may not be complete.
| Star | Constellation | Right ascension | Declination | App. mag. | Distance | Spectral type | Planet | Mass | Radius | Orbital period | a | ecc. | incl. | Discovery year |
| OGLE-TR-10 | Sagittarius | 15.78 | 5000 | G2V | OGLE-TR-10 b | 0.63 | 1.26 | 3.10129 | 0.04162 | 0 | 84.5 | 2002 | ||
| OGLE-TR-111 | Carina | 16.96 | 5000 | G | OGLE-TR-111 b | 0.53 | 1.0 | 4.01610 | 0.047 | 0 | 88.1 | 2002 | ||
| OGLE-TR-132 | Carina | 15.72 | 7110 | F | OGLE-TR-132 b | 1.14 | 1.18 | 1.689868 | 0.0306 | 0 | 85 | 2003 | ||
| OGLE-TR-56 | Sagittarius | 16.56 | 4892 | G | OGLE-TR-56 b | 1.29 | 1.30 | 1.211909 | 0.0225 | 0 | 78.8 | 2003 | ||
| OGLE-TR-113 | Carina | 16.08 | 1800 | K | OGLE-TR-113 b | 1.32 | 1.09 | 1.4324757 | 0.0229 | 0 | 89.4 | 2004 | ||
| OGLE-2003-BLG-235L /MOA-2003-BLG-53L | Sagittarius | 19000 | K | OGLE-2003-BLG-235Lb | 2.6 | 4.3 | 2004 | |||||||
| OGLE-2005-BLG-071L | Scorpius | 19.5 | 9500 | M | OGLE-2005-BLG-071Lb | 3.5 | 3600 | 3.6 | 2005 | |||||
| OGLE-2005-BLG-169L | Sagittarius | 19.4 | 8800 | M? | OGLE-2005-BLG-169Lb | 0.041 | 0.345 | 2006 | ||||||
| OGLE-2005-BLG-390L | Sagittarius | 21500 | M? | OGLE-2005-BLG-390Lb | 0.018 | 2006 | ||||||||
| OGLE-TR-211 | Carina | 5300 | F | OGLE-TR-211 b | 1.03 | 1.36 | 3.67724 | 0.051 | 0 | ≥87.2 | 2007 | |||
| OGLE-TR-182 | Carina | 16.84 | 12700 | G | OGLE-TR-182 b | 1.01 | 1.13 | 3.9791 | 0.051 | 0 | 85.7 | 2007 | ||
| OGLE2-TR-L9 | Carina | 2935 | F3 | OGLE2-TR-L9 b | 4.5 | 1.61 | 2.4855335 | 0.0308 | 2008 | |||||
| OGLE-2006-BLG-109L | Sagittarius | 4900 | OGLE-2006-BLG-109Lb | 0.71 | 1825 | 2.3 | 2008 | |||||||
| OGLE-2006-BLG-109L | Sagittarius | 4900 | OGLE-2006-BLG-109Lc | 0.27 | 5100 | 4.8 | 0.11 | 59 | 2008 | |||||
| OGLE-2012-BLG-0026L | 17:34:19.0 | 4080 | OGLE-2012-BLG-0026Lb | 0.11 | 3.82 | 2012 | ||||||||
| OGLE-2012-BLG-0026L | 4080 | OGLE-2012-BLG-0026Lc | 0.68 | 4.63 | 2012 | |||||||||
| OGLE-2011-BLG-0251 | 8232 | M | OGLE-2011-BLG-0251 b | 0.53±0.21 | 2.72±0.75 or 1.5±0.5 | 2013 | ||||||||
| OGLE-2007-BLG-349 | OGLE-2007-BLG-349b | 2016 | ||||||||||||
| OGLE-2016-BLG-1195L | OGLE-2016-BLG-1195Lb | 2017 |
discovered by the OGLE Team
Notes: For events detected by the gravitational microlensing method, year stands for OGLE season, BLG means that an event detected is in the Galactic BuLGe, and the following 3-digit number is an ordinal number of microlensing event in that season. For events detected by the transit method TR stands for TRansit and the following 3-digit number is an ordinal number of transit event.
File:OGLE-IV-BLG-fields-overview.png|thumb|OGLE-IV Galactic Bulge fields with cadence, from .