Optical Gravitational Lensing Experiment

Optical Gravitational Lensing Experiment

OGLE telescope at the Las Campanas Observatory
Alternative names	OGLE
Coordinates	29°00′36″S 70°41′56″W / 29.01°S 70.699°W / -29.01; -70.699
Website	ogle.astrouw.edu.pl
Related media on Commons
[edit on Wikidata]

The Optical Gravitational Lensing Experiment (OGLE) is a Polish

The main targets of the experiment are the

The project is now in its fourth phase. The first phase, OGLE-I (1992–1995) used the 1.0-metre (3 ft 3 in) Swope telescope and a single-chip CCD sensor. For OGLE-II (1996–2000), a 1.3-metre (4 ft 3 in) telescope dedicated to the project (the Warsaw telescope) 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.^[1]

OGLE-III (2001–2009) 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

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.[3] 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 the US, 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.^[4][5]

In January 2022 in collaboration with Microlensing Observations in Astrophysics (MOA) they reported in a preprint the first rogue black hole.^[6][7][8][9] While there have been other candidates^[10] this is the most solid detection so far as their technique allowed to measure not only the amplification of light but also its deflection by the BH from the microlensing data.

Planets discovered

At least seventeen planets have so far been discovered by the OGLE project. Eight of the planets were discovered by the

Planets are shown in the order of discovery. Planets in multiple-planet systems are highlighted in yellow. The list below may not be complete.

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.

See also

References