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New Method to Measure Proper Motions of Microlensed Sources: Application to Candidate Free-Floating-Planet Event MOA-2011-BLG-262
Jan Skowron, Andrzej Udalski, Michał K Szymański +9
We develop a new method to measure source proper motions in microlensing events, which can partially overcome problems due to blending. It takes advantage of the fact that the sour…
MOA-2008-BLG-379Lb: A Massive Planet from a High Magnification Event with a Faint Source
D. Suzuki, A. Udalski, T. Sumi +31
We report analysis of high microlensing event MOA-2008-BLG-379, which has a strong microlensing anomaly at its peak, due to a massive planet with a mass ratio of q = 6.9 x 10^{-3}.…
Multiplicity of Galactic Cepheids from long-baseline interferometry. II. The Companion of AX Circini revealed with VLTI/PIONIER
A. Gallenne, A. Mérand, P. Kervella +6
Aims: We aim at detecting and characterizing the main-sequence companion of the Cepheid AX Cir ( 18 yrs). The long-term objective is to estimate the mass of b…
The Araucaria Project. The distance to the Small Magellanic Cloud from late-type eclipsing binaries
Dariusz Graczyk, Grzegorz Pietrzynski, Ian B. Thompson +12
We present a distance determination to the Small Magellanic Cloud (SMC) based on an analysis of four detached, long period, late type eclipsing binaries discovered by the OGLE Surv…
Large Variety of New Pulsating Stars in the OGLE-III Galactic Disk Fields
P. Pietrukowicz, W. A. Dziembowski, P. Mroz +10
We present the results of a search for pulsating stars in the 7.12 deg^2 OGLE-III Galactic disk area in the direction tangent to the Centaurus Arm. We report the identification of…
Binary Cepheids from optical interferometry
A. Gallenne, P. Kervella, A. Mérand +3
Classical Cepheid stars have been considered since more than a century as reliable tools to estimate distances in the universe thanks to their Period-Luminosity (P-L) relationship.…
Eclipsing Binary Stars in the OGLE-III Fields of the Small Magellanic Cloud
M. Pawlak, D. Graczyk, I. Soszynski +10
We present a large sample of eclipsing binary stars detected in the Small Magellanic Cloud fields covering about 14 square degrees that have been monitored for eight years during t…
MOA-2010-BLG-328Lb: a sub-Neptune orbiting very late M dwarf ?
K. Furusawa, A. Udalski, T. Sumi +119
We analyze the planetary microlensing event MOA-2010-BLG-328. The best fit yields host and planetary masses of Mh = 0.11+/-0.01 M_{sun} and Mp = 9.2+/-2.2M_Earth, corresponding to…
Variability of Massive Stars with Known Spectral Types in the Small Magellanic Cloud Using 8 Years of OGLE-III Data
M. Kourniotis, A. Z. Bonanos, I. Soszynski +10
We present a variability study of 4646 massive stars in the Small Magellanic Cloud (SMC) with known spectral types from the catalog of Bonanos et al. (2010) using the light curves…
A Super-Jupiter orbiting a late-type star: A refined analysis of microlensing event OGLE-2012-BLG-0406
Y. Tsapras, J. -Y. Choi, R. A. Street +122
We present a detailed analysis of survey and follow-up observations of microlensing event OGLE-2012-BLG-0406 based on data obtained from 10 different observatories. Intensive cover…
MOA-2011-BLG-322Lb: a "second generation survey" microlensing planet
Y. Shvartzvald, D. Maoz, S. Kaspi +37
Global "second-generation" microlensing surveys aim to discover and characterize extrasolar planets and their frequency, by means of round-the-clock high-cadence monitoring of a la…
The Araucaria Project : the Baade-Wesselink projection factor of pulsating stars
N. Nardetto, J. Storm, W. Gieren +2
The projection factor used in the Baade-Wesselink methods of determining the distance of Cepheids makes the link between the stellar physics and the cosmological distance scale. A…
The Kepler-SEP Mission: Harvesting the South Ecliptic Pole large-amplitude variables with Kepler
R. Szabó, L. Molnár, Z. Kołaczkowski +28
As a response to the white paper call, we propose to turn Kepler to the South Ecliptic Pole (SEP) and observe thousands of large amplitude variables for years with high cadence in…
An interferometric view on binarity and circumstellar envelopes of Cepheids
A. Gallenne, P. Kervella, A. Mérand +4
Optical interferometry is the only technique giving access to milli-arcsecond (mas) resolution at infrared wavelengths. For Cepheids, this is a powerful and unique tool to detect t…
Physical parameters and the projection factor of the classical Cepheid in the binary system OGLE-LMC-CEP-0227
B. Pilecki, D. Graczyk, G. Pietrzyński +14
A novel method of analysis of double-lined eclipsing binaries containing a radially pulsating star is presented. The combined pulsating-eclipsing light curve is built up from a pur…
Dwarf Novae in the OGLE Data. II. Forty New Dwarf Novae in the OGLE-III Galactic Disk Fields
P. Mroz, P. Pietrukowicz, R. Poleski +9
We report the discovery of forty erupting cataclysmic variable stars in the OGLE-III Galactic disk fields: seventeen objects of U Gem type, four of Z Cam type, and nineteen stars s…
Eclipsing Binary Stars in the OGLE-III Galactic Disk Fields
P. Pietrukowicz, P. Mroz, I. Soszynski +9
We present the analysis of 11 589 eclipsing binary stars identified in twenty-one OGLE-III Galactic disk fields toward constellations of Carina, Centaurus, and Musca. All eclipsing…
Microlensing Discovery of a Tight, Low Mass-ratio Planetary-mass Object around an Old, Field Brown Dwarf
C. Han, Y. K. Jung, A. Udalski +67
Observations of accretion disks around young brown dwarfs have led to the speculation that they may form planetary systems similar to normal stars. While there have been several de…
Super-massive planets around late-type stars - the case of OGLE-2012-BLG-0406Lb
Radosław Poleski, Andrzej Udalski, Subo Dong +10
The core accretion theory of planetary formation does not predict that super-Jupiters will form beyond the snow line of a low mass stars. We present a discovery of 3.9 +- 1.2 M_Jup…
The Variable Stars from the OGLE-III Shallow Survey in the Large Magellanic Cloud
K. Ulaczyk, M. K. Szymański, A. Udalski +8
We describe variable stars found in the data collected during the OGLE-III Shallow Survey covering the I-band magnitude range from 9.7 mag to 14.5 mag. The main result is the exten…
Gravitational Binary-lens Events with Prominent Effects of Lens Orbital Motion
H. Park, A. Udalski, C. Han +58
Gravitational microlensing events produced by lenses composed of binary masses are important because they provide a major channel to determine physical parameters of lenses. In thi…
Understanding the dynamical structure of pulsating stars: The center-of-mass velocity and the Baade-Wesselink projection factor of the beta-Cephei star alpha-Lupi
N. Nardetto, P. Mathias, A. Fokin +5
High-resolution spectroscopy of pulsating stars is a powerful tool to study the dynamical structure of their atmosphere. Lines asymmetry is used to derive the center-of-mass veloci…
The Magellanic Quasars Survey. III. Spectroscopic Confirmation of 758 AGNs Behind the Magellanic Clouds
Szymon Kozlowski, Christopher A. Onken, Christopher S. Kochanek +12
The Magellanic Quasars Survey (MQS) has now increased the number of quasars known behind the Magellanic Clouds by almost an order of magnitude. All survey fields in the Large Magel…
The Araucaria Project. A Distance Determination to the Local Group Spiral M33 from Near-Infrared Photometry of Cepheid Variables
W. Gieren, M. Gorski, G. Pietrzynski +10
Motivated by an amazing range of reported distances to the nearby Local Group spiral galaxy M33, we have obtained deep near-infrared photometry for 26 long-period Cepheids in this…