Optical Gravitational Lensing Experiment

Optical Gravitational Lensing Experiment

OGLE telescope at the Las Campanas Observatory
Alternative names	OGLE
Survey type	Astronomical survey, Optical telescope
Target	Gravitational microlensing, Exoplanet
Organization	University of Warsaw
Coordinates	29°00′36″S 70°41′56″W / 29.01°S 70.699°W / -29.01; -70.699Coordinates: 29°00′36″S 70°41′56″W / 29.01°S 70.699°W / -29.01; -70.699
Observations	Warsaw Telescope
Website	ogle.astrouw.edu.pl
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The Optical Gravitational Lensing Experiment (OGLE) is a Polish astronomical project based at the University of Warsaw that runs a long-term variability sky survey (1992-present). Main goals are the detection and classification of variable stars (pulsating and eclipsing), 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 (OGLE-TR-56b) 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 (1992–1995), was the project pilot phase; for OGLE-II (1996–2000), a telescope was specially constructed, placed in Las Campanas Observatory and dedicated to the project. The 8-chip mosaic CCD camera was built in Poland and shipped to Chile. OGLE-III (2001–2009) was primarily devoted to detecting gravitational microlensing events and transiting planets in four fields: the Galactic Bulge, the constellation Carina,^[1] 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. 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 in great distance from stars around which they revolve despite there being other stars near them.^[2][3]

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.

Artist's impression of the planet OGLE-2005-BLG-390Lb 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.

OGLE-IV Galactic Bulge fields with cadence, from OGLE-IV sky coverage.

See also

• All Sky Automated Survey
• Bohdan Paczyński
• Grzegorz Pojmański
• List of planetary systems
• Microlensing Observations in Astrophysics (MOA)

References

External links

• OGLE Homepage in Warsaw, Poland
• OGLE-IV sky coverage maps
• Detailed OGLE-IV fields diagrams