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Sep 16 – 20, 2019
University of Stuttgart, Campus Vaihingen
Europe/Berlin timezone

OGLE-ing the Variable Sky


Tuesday, September 17, 14:00-18:30

Room: 9.22

Pawel Pietrukowicz (University of Warsaw, Poland)

The Optical Gravitational Lensing Experiment (OGLE) is a long-term large-scale variability survey conducted at Las Campanas Observatory, Chile. The Principal Investigator of the project is Prof. Andrzej Udalski, the 2018 Karl-Schwarzschild Medal winner. OGLE started in 1992, with a monitoring programme of 2 million stars towards the Galactic bulge. The prime goal of the programme was the detection of microlensing events and characterization of dark massive halo objects, suspected components of the mysterious dark matter. Currently, OGLE monitors over 2 billion stars of the Milky Way stripe and Magellanic Clouds in searches for any kind of variable objects: periodic, irregular as well as transients. The survey has a significant impact on modern stellar astrophysics and other fields of astronomy. In 2002, OGLE opened the era of extrasolar planets detection through the transit technique. Out of some 2000 microlensing events recorded every year, several events are of unique planetary nature. OGLE has discovered a full variety of exoplanets: Jupiter-like, ice giants, cold super-Earths, and many candidates for free-floating planets.

Among hundreds of extragalactic transients observed in the background of the Magellanic System, OGLE has found rare types of supernovae and candidates for tidal disruption events. Thanks to regular high-cadance observations, OGLE has discovered and classified, so far, over one million genuine variable stars, including precious pulsating stars, such as Cepheids and RR Lyrae-type stars. These stars are used to trace the structure of young and old populations in the Milky Way and nearby satellite galaxies. Very recently, an unexpected, completely new class of variable stars has been found in the OGLE data, the Blue Large-Amplitude Pulsators. OGLE has provided a proof that rare spectacular phenomena called red novae are stellar mergers. Long-term observations of millions of sources allow studying various processes happening on long time-scales, such as photometric behaviour of quasars and evolutionary changes in stars and stellar systems. During the meeting various OGLE-related topics as well as the OGLE data archive will be presented.

14:00 - 14:10  Joachim Wambsganss (Heidelberg) - Introduction Words
14:10 - 14:30  Andrew Gould (MPA-Heidelberg, Ohio State) - The past and the future of microlensing
14:35 - 14:55  Radek Poleski (Ohio State) - Microlensing exoplanets

15:10 - 15:40  Coffee Break & Poster Session

15:50 - 16:00  Pawel Pietrukowicz (Warsaw) - OGLE data products
16:00 - 16:20  Giuseppe Bono (Roma Tor Vergata) - RR Lyrae stars to trace the Bulge/Halo transition
16:25 - 16:45  Veronika Schaffenroth (Potsdam) - The EREBOS project: Studying the influence of low-mass companions on late stellar evolution
16:50 - 17:10  Radek Smolec (Copernicus Center) - OGLE view on pulsating stars
17:15 - 17:35  Ortwin Gerhard (MPE-Garching) - The Milky Way bulge/bar
17:40 - 18:00  Anna Jacyszyn-Dobrzeniecka (Heidelberg) - Structure of the Magellanic System
18:05 - 18:25  Szymon Kozlowski (Warsaw) - Optical variability of quasars

Related posters:

Name Title
IWANEK, Patryk 12 660 spotted stars towards the OGLE Galac-
tic bulge fields
WRONA, Marcin Overview of the OGLE Collection of Variable