B. Paczyński
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View article: Coronal activity from the ASAS eclipsing binaries
Coronal activity from the ASAS eclipsing binaries Open
We combine the catalogue of eclipsing binaries from the All Sky Automated Survey (ASAS) with the ROSAT All Sky Survey (RASS). The combination results in 836 eclipsing binaries that display coronal activity and is the largest sample of acti…
View article: Discovery of a Jupiter/Saturn Analog with Gravitational Microlensing
Discovery of a Jupiter/Saturn Analog with Gravitational Microlensing Open
Searches for extrasolar planets have uncovered an astonishing diversity of planetary systems, yet the frequency of solar system analogs remains unknown. The gravitational microlensing planet search method is potentially sensitive to multip…
View article: Alien Planetary System Looks a Lot Like Home
Alien Planetary System Looks a Lot Like Home Open
Searches for extrasolar planets have uncovered an astonishing diversity of planetary systems, yet the frequency of solar system analogs remains unknown. The gravitational microlensing planet search method is potentially sensitive to multip…
View article: The VLTI as a tool to study eclipsing binaries for an improved distance scale
The VLTI as a tool to study eclipsing binaries for an improved distance scale Open
Long-baseline interferometry with facilities such as the ESO VLTI is beginning to have the capability to measure directly in the range of milliarcsecond and less the angular separation and the angular diameter of some selected eclipsing bi…
View article: First Space‐Based Microlens Parallax Measurement:<i>Spitzer</i>Observations of OGLE‐2005‐SMC‐001
First Space‐Based Microlens Parallax Measurement:<i>Spitzer</i>Observations of OGLE‐2005‐SMC‐001 Open
We combine Spitzer and ground-based observations to measure the microlens parallax of OGLE-2005-SMC-001, the first such space-based determination since S. Refsdal proposed the idea in 1966. The parallax measurement yields a projected veloc…
View article: First Space-Based Microlens Parallax Measurement: Spitzer Observations of OGLE-2005-SMC-001
First Space-Based Microlens Parallax Measurement: Spitzer Observations of OGLE-2005-SMC-001 Open
We combine Spitzer and ground-based observations to measure the microlens parallax of OGLE-2005-SMC-001, the first such space-based determination since S. Refsdal proposed the idea in 1966. The parallax measurement yields a projected veloc…
View article: Astronomy with Small Telescopes
Astronomy with Small Telescopes Open
The All Sky Automated Survey (ASAS) is monitoring all sky to about 14 mag with a cadence of about 1 day; it has discovered about 10^5 variable stars, most of them new. The instrument used for the survey had aperture of 7 cm. A search for p…
View article: Astronomy with Small Telescopes
Astronomy with Small Telescopes Open
The All Sky Automated Survey (ASAS) is monitoring all sky to about 14 mag with a cadence of about 1 day; it has discovered about 10^5 variable stars, most of them new. The instrument used for the survey had aperture of 7 cm. A search for p…
View article: Microlens OGLE-2005-BLG-169 Implies That Cool Neptune-like Planets Are Common
Microlens OGLE-2005-BLG-169 Implies That Cool Neptune-like Planets Are Common Open
We detect a Neptune mass ratio (q 8#10 5) planetary companion to the lens star in the extremely high magnification (A ∼ 800) microlensing event OGLE-2005-BLG-169. If the parent is a main-sequence star, it has mass M ∼ 0.5 M,, implying a pl…
View article: Eclipsing binaries in the All Sky Automated Survey catalogue
Eclipsing binaries in the All Sky Automated Survey catalogue Open
The All Sky Automated Survey (ASAS) is a long-term project to monitor bright variable stars over the whole sky. It has discovered 50 099 variables brighter than V < 14 mag south of declination +28°, and among them 11 076 eclipsing binar…
View article: Improved correlation between the variability and peak luminosity of gamma-ray bursts
Improved correlation between the variability and peak luminosity of gamma-ray bursts Open
A new procedure for smoothing a gamma-ray burst (GRB) lightcurve and calculating its variability is presented. Applying the procedure to a sample of 25 long GRBs, we have obtained a very tight correlation between the variability and the pe…
View article: Discovery of the distant cool sub-Neptune mass planet OGLE 2005-BLG-390Lb by microlensing
Discovery of the distant cool sub-Neptune mass planet OGLE 2005-BLG-390Lb by microlensing Open
The favoured theoretical explanation for planetary systems formation is the core-accretion model in which solid planetesimals accumulate to build up planetary cores, which then accrete nebular gas if they are sufficiently massive. Around M…
View article: Gamma-ray bursts from quark stars
Gamma-ray bursts from quark stars Open
Long gamma-ray bursts (GRBs) are believed to be related to the explosion of Type Ic supernovae, which have been stripped of their hydrogen and helium envelopes. There appear to be two types of these explosions: those that are approximately…
View article: A Jovian-Mass Planet in Microlensing Event OGLE-2005-BLG-071
A Jovian-Mass Planet in Microlensing Event OGLE-2005-BLG-071 Open
We report the discovery of a several-Jupiter-mass planetary companion to the primary lens star in microlensing event OGLE-2005-BLG-071. Precise (≲1%) photometry at the peak of the event yields an extremely high signal-to-noise ratio …
View article: e-VLBI observations of SN2001em - an off-axis GRB candidate
e-VLBI observations of SN2001em - an off-axis GRB candidate Open
Studying transient phenomena with the Very Long Baseline Interferometry (VLBI) technique faces severe difficulties because the turnaround time of the experiments from the observations to the scientific result is rather long. The e-VLBI tec…
View article: On the nature of the S stars in the Galactic Center
On the nature of the S stars in the Galactic Center Open
Davies and King have suggested that the bright stars observed on short-period orbits about Sgr A* (``S stars'') are old, low-mass stripped AGB stars rather than young, high-mass main-sequence stars. If the observationally inferred effectiv…
View article: The Microlensing Planet Finder: completing the census of extrasolar planets in the Milky Way
The Microlensing Planet Finder: completing the census of extrasolar planets in the Milky Way Open
The Microlensing Planet Finder (MPF) is a proposed Discovery mission that will complete the first census of extrasolar planets with sensitivity to planets like those in our own solar system. MPF will employ a 1.1m aperture telescope, which…
View article: The Microlensing Planet Finder: Completing the Census of Extrasolar Planets in the Milky Way
The Microlensing Planet Finder: Completing the Census of Extrasolar Planets in the Milky Way Open
The Microlensing Planet Finder (MPF) is a proposed Discovery mission that will complete the first census of extrasolar planets with sensitivity to planets like those in our own solar system. MPF will employ a 1.1m aperture telescope, which…
View article: The<i>Swift</i>Gamma‐Ray Burst Mission
The<i>Swift</i>Gamma‐Ray Burst Mission Open
The Swift mission, scheduled for launch in 2004, is a multiwavelength observatory for gamma-ray burst (GRB) astronomy. It is a first-of-its-kind autonomous rapid-slewing satellite for transient astronomy and pioneers the way for future rap…
View article: OGLE small-amplitude variables in the Galactic bar
OGLE small-amplitude variables in the Galactic bar Open
Among over 200,000 Galactic Bulge variable stars in the public domain OGLE catalogue, we found over 15,000 red giant variables following two well defined period -- amplitude relations. The periods are in the range 10 < P < 100 days, and am…
View article: Geometrically Thin Disk Accreting into a Black Hole
Geometrically Thin Disk Accreting into a Black Hole Open
A numerical model of a steady state, thin accretion disk with a constant effective speed of sound is presented. We demonstrate that `zero torque' inner boundary condition is a reasonable approximation provided that the disk thickness, incl…
View article: Gravitational Microlensing: Black Holes, Planets; OGLE, VLTI, HST and Space Probes
Gravitational Microlensing: Black Holes, Planets; OGLE, VLTI, HST and Space Probes Open
OGLE and other projects are likely to discover first stellar mass black holes and the first planets through gravitational lensing in the next year or two. It is important to have follow-up projects ready, using diverse observing methods. T…
View article: The Distance to Pleiades
The Distance to Pleiades Open
The distance to Pleiades remains controversial. There is a simple way to resolve the dispute definitely by measuring the distance to one of its brightest members, Atlas, which is astrometric and spectroscopic binary.
View article: A Possible Planetary Event OGLE-2002-BLG-055
A Possible Planetary Event OGLE-2002-BLG-055 Open
The microlensing event OGLE-2002-BLG-055 has a single, but very reliable data point, deviating upward from a single source microlensing light curve by 0.6 mag. The simplest interpretation calls for a binary lens with a strong parallax effe…
View article: Geometrically Thin Disk Accreting Into a Black Hole
Geometrically Thin Disk Accreting Into a Black Hole Open
A numerical model of a steady state, thin accretion disk with a constant effective speed of sound is presented. We demonstrate that `zero torque' inner boundary condition is a reasonable approximation provided that the disk thickness, incl…
View article: The Optical Gravitational Lensing Experiment. Search for Planetary and Low-Luminosity Object Transits in the Galactic Disk. Results of 2001 Campaign
The Optical Gravitational Lensing Experiment. Search for Planetary and Low-Luminosity Object Transits in the Galactic Disk. Results of 2001 Campaign Open
We present results of an extensive photometric search for planetary and low-luminosity object transits in the Galactic disk stars commencing the third phase of the Optical Gravitational Lensing Experiment -- OGLE-III. Photometric observati…
View article: Massive Variability Searches: The Past, Present and Future Massive Variability Searches
Massive Variability Searches: The Past, Present and Future Massive Variability Searches Open
Many decades ago a search for variable stars was one of the main areas of astrophysical research. Such searches, conducted with CCD detectors rather than with photographic plates, became a by-product of several projects seeking gravitation…