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First assessment of the binary lens OGLE-2015_BLG-0232
E. Bachelet, V. Bozza, C. Han +51
We present an analysis of the microlensing event OGLE-2015-BLG-0232. This event is challenging to characterize for two reasons. First, the light curve is not well sampled during th…
Two new free-floating or wide-orbit planets from microlensing
P. Mroz, A. Udalski, D. P. Bennett +57
Planet formation theories predict the existence of free-floating planets that have been ejected from their parent systems. Although they emit little or no light, they can be detect…
Identification of V735 Sgr as an Active Herbig Ae/Be Object
P. Pietrukowicz, F. Di Mille, R. Angeloni +1
V735 Sgr was known as an enigmatic star with rapid brightness variations. Long-term OGLE photometry, brightness measurements in infrared bands, and recently obtained moderate resol…
Three-Dimensional Distributions of Type II Cepheids and Anomalous Cepheids in the Magellanic Clouds. Do these Stars Belong to the Old, Young or Intermediate-Age Population?
P. Iwanek, I. Soszyński, D. Skowron +8
The nature of type II Cepheids and anomalous Cepheids is still not well known and their evolutionary channels leave many unanswered questions. We use complete collection of classic…
Discovery of two quasars at from the OGLE Survey
Szymon Kozłowski, Eduardo Bañados, A. Udalski +16
We have used deep Optical Gravitational Lensing Experiment (OGLE-IV) images ( mag, mag at ) of the Magellanic System, encompassing an area of $\s…
OGLE Collection of Galactic Cepheids
A. Udalski, I. Soszyński, P. Pietrukowicz +10
We present here a new major part of the OGLE Collection of Variable Stars - OGLE Collection of Galactic Cepheids. The new dataset was extracted from the Galaxy Variability Survey i…
Rotation curve of the Milky Way from Classical Cepheids
P. Mroz, A. Udalski, D. M. Skowron +7
Flat rotation curves of spiral galaxies are considered as an evidence for dark matter, but the rotation curve of the Milky Way is difficult to measure. Various objects were used to…
OGLE-2015-BLG-1670Lb: A Cold Neptune beyond the Snow Line in the Provisional WFIRST Microlensing Survey Field
Clément Ranc, David P. Bennett, Yuki Hirao +56
We present the analysis of the microlensing event OGLE-2015-BLG-1670, detected in a high-extinction field, very close to the Galactic plane. Due to the dust extinction along the li…
OGLE-2017-BLG-0039: Microlensing Event with Light from the Lens Identified from Mass Measurement
C. Han, Y. K. Jung, A. Udalski +58
We present the analysis of the caustic-crossing binary microlensing event OGLE-2017-BLG-0039. Thanks to the very long duration of the event, with an event time scale $t_{\rm E}\sim…
OGLE-2014-BLG-1186: gravitational microlensing providing evidence for a planet orbiting the foreground star or for a close binary source?
M. Dominik, E. Bachelet, V. Bozza +40
(abridged) Using the particularly long gravitational microlensing event OGLE-2014-BLG-1186 with a time-scale ~ 300 d, we present a methodology for identifying the na…
The OGLE Collection of Variable Stars. Type II Cepheids in the Magellanic System
I. Soszyński, A. Udalski, M. K. Szymański +10
We present a nearly complete collection of type II Cepheids in the Magellanic System. The sample consists of 338 objects: 285 and 53 variables in the Large and Small Magellanic Clo…
OGLE-2017-BLG-0537: Microlensing Event with a Resolvable Lens in years from High-resolution Follow-up Observations
Y. K. Jung, C. Han, A. Udalski +29
We present the analysis of the binary-lens microlensing event OGLE-2017-BLG-0537. The light curve of the event exhibits two strong caustic-crossing spikes among which the second ca…
Impact of distance determinations on Galactic structure. II. Old tracers
A. Kunder, E. Valenti, M. Dall'Ora +14
Here we review the efforts of a number of recent results that use old tracers to understand the build up of the Galaxy. Details that lead directly to using these old tracers to mea…
A Planetary Microlensing Event with an Unusually Red Source Star: MOA-2011-BLG-291
David P. Bennett, Andrzej Udalski, Ian A. Bond +43
We present the analysis of planetary microlensing event MOA-2011-BLG-291, which has a mass ratio of and a source star that is redder (or brighter) than…
A three-dimensional map of the Milky Way using classical Cepheid variable stars
D. M. Skowron, J. Skowron, P. Mróz +9
The Milky Way is a barred spiral galaxy, with physical properties inferred from various tracers informed by the extrapolation of structures seen in other galaxies. However, the dis…
OGLE-2014-BLG-0962 and the First Statistical Validation of Bayesian Priors for Galactic Microlensing
Yutong Shan, Jennifer C. Yee, Andrzej Udalski +46
OGLE-2014-BLG-0962 (OB140962) is a stellar binary microlensing event that was well-covered by observations from the Spitzer satellite as well as ground-based surveys. Modelling yie…
The late type eclipsing binaries in the Large Magellanic Cloud: catalogue of fundamental physical parameters
Dariusz Graczyk, Grzegorz Pietrzynski, Ian B. Thompson +29
We present a determination of precise fundamental physical parameters of twenty detached, double- lined, eclipsing binary stars in the Large Magellanic Cloud (LMC) containing G- or…
Microlensing Parallax for OGLE-2017-BLG-0896 Reveals a Counter-Rotating Low-Mass Brown Dwarf
Yossi Shvartzvald, Jennifer C. Yee, Jan Skowron +63
The kinematics of isolated brown dwarfs in the Galaxy, beyond the solar neighborhood, is virtually unknown. Microlensing has the potential to probe this hidden population, as it ca…
An ice giant exoplanet interpretation of the anomaly in microlensing event OGLE-2011-BLG-0173
R. Poleski, B. S. Gaudi, A. Udalski +7
We analyze the microlensing event OGLE-2011-BLG-0173, which shows a small perturbation at the end of the microlensing event caused by the primary lens. We consider both binary lens…
Spitzer Opens New Path to Break Classic Degeneracy for Jupiter-Mass Microlensing Planet OGLE-2017-BLG-1140Lb
S. Calchi Novati, J. Skowron, Y. K. Jung +36
We analyze the combined Spitzer and ground-based data for OGLE-2017-BLG-1140 and show that the event was generated by a Jupiter-class planet orbiting…
The Cluster AgeS Experiment (CASE). Detecting Photometric Variability with the Friends of Friends Algorithm
M. Rozyczka, W. Narloch, P. Pietrukowicz +2
We adapt the friends of friends algorithm to the analysis of light curves, and show that it can be successfully applied to searches for transient phenomena in large photometric dat…
MOA-2015-BLG-337: A Planetary System with a Low-mass Brown Dwarf/Planetary Boundary Host, or a Brown Dwarf Binary
S. Miyazaki, T. Sumi, D. P. Bennett +59
We report the discovery and the analysis of the short timescale binary-lens microlensing event, MOA-2015-BLG-337. The lens system could be a planetary system with a very low mass h…
OGLE-2017-BLG-0482Lb: A Microlensing Super-Earth Orbiting a Low-mass Host Star
C. Han, Y. Hirao, A. Udalski +62
We report the discovery of a planetary system in which a super-earth orbits a late M-dwarf host. The planetary system was found from the analysis of the microlensing event OGLE-201…
A Likely Detection of a Two-Planet System in a Low Magnification Microlensing Event
D. Suzuki, D. P. Bennett, A. Udalski +37
We report on the analysis of a microlensing event OGLE-2014-BLG-1722 that showed two distinct short term anomalies. The best fit model to the observed light curves shows that the t…