R. Poleski
A5035560157- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Adaptive optics and wavefront sensing
- Galaxies: Formation, Evolution, Phenomena
- Pulsars and Gravitational Waves Research
- History and Developments in Astronomy
- Astrophysics and Cosmic Phenomena
- Atmospheric and Environmental Gas Dynamics
- Calibration and Measurement Techniques
- Space Exploration and Technology
- Particle Accelerators and Free-Electron Lasers
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Atmospheric Ozone and Climate
- Planetary Science and Exploration
- High-pressure geophysics and materials
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- SAS software applications and methods
- Scientific Research and Discoveries
University of Warsaw
2015-2024
The Ohio State University
2013-2022
Campbell Collaboration
2016-2018
Max Planck Institute for Astronomy
2018
Max Planck Society
2018
Optica
2013-2016
Ohio University
2016
LIGO Scientific Collaboration
2013
We combine VI photometry from OGLE-III with VVV and 2MASS measurements of E(J-K_{s}) to resolve the longstanding problem non-standard optical extinction toward Galactic bulge. show that is well-fit by relation A_{I} = 0.7465*E(V-I) + 1.3700*E(J-K_{s}), or, equivalently, 1.217*E(V-I)(1+1.126*(E(J-K_{s})/E(V-I)-0.3433)). The near-IR reddening law inner Galaxy approximately follows an R_{V} \approx 2.5 curve a dispersion {\sigma}_{R_{V}} 0.2, consistent extragalactic investigations hosts type...
We present the first measurement of planet frequency beyond "snow line," for planet-to-star mass-ratio interval −4.5 < log q −2, corresponding to range ice giants gas giants. find at mean mass ratio = 5 × 10−4 with no discernible deviation from a flat (Öpik's law) distribution in log-projected separation s. The determination is based on sample six planets detected intensive follow-up observations high-magnification (A>200) microlensing events during 2005–2008. sampled host stars have typical...
Robust fast methods to classify variable light curves in large sky surveys are becoming increasingly important. While it is relatively straightforward identify common periodic stars and particular transient events (supernovae, novae, microlensing events), there no equivalent for non-periodic continuously varying sources (quasars, aperiodic stellar variability). In this paper, we present a method modeling classifying such sources. We demonstrate the using ∼86, 000 from OGLE-II survey of LMC...
Context. Stellar mergers are expected to take place in numerous circumstences the evolution of stellar systems. In particular, they considered as a plausible origin eruptions V838 Mon type. V1309 Sco is most recent eruption this type our Galaxy. The object was discovered September 2008.
Abstract APOGEE-2 is a high-resolution, near-infrared spectroscopic survey observing ∼3 × 10 5 stars across the entire sky. It successor to APOGEE and part of Sloan Digital Sky Survey IV (SDSS-IV). expanding on APOGEE’s goals addressing critical questions stellar astrophysics, populations, Galactic chemodynamical evolution using (1) an enhanced set target types (2) second spectrograph at Las Campanas Observatory in Chile. targeting red giant branch clump stars, RR Lyrae, low-mass dwarf young...
The Wide Field Infrared Survey Telescope (WFIRST) is a 2.4m space telescope with 0.281 deg^2 field of view for near-IR imaging and slitless spectroscopy coronagraph designed > 10^8 starlight suppresion. As background information Astro2020 white papers, this article summarizes the current design anticipated performance WFIRST. While WFIRST does not have UV imaging/spectroscopic capabilities Hubble Space Telescope, wide surveys hundreds times more efficient. Some most ambitious multi-cycle...
Abstract We report the first unambiguous detection and mass measurement of an isolated stellar-mass black hole (BH). used Hubble Space Telescope (HST) to carry out precise astrometry source star long-duration ( t E ≃ 270 days), high-magnification microlensing event MOA-2011-BLG-191/OGLE-2011-BLG-0462 (hereafter designated as MOA-11-191/OGLE-11-462), in direction Galactic bulge. HST imaging, conducted at eight epochs over interval 6 yr, reveals a clear relativistic astrometric deflection...
Abstract We present the analysis of five black hole candidates identified from gravitational microlensing surveys. Hubble Space Telescope astrometric data and densely sampled light curves ground-based surveys are fit with a single-source, single-lens model in order to measure mass luminosity each lens determine if it is hole. One targets (OGLE-2011-BLG-0462/MOA-2011-BLG-191 or OB110462 for short) shows significant >1 mas coherent shift, little no flux, has an inferred 1.6–4.4 M ⊙ . This...
Abstract Measurements of the microlensing optical depth and event rate toward Large Magellanic Cloud (LMC) can be used to probe distribution mass function compact objects in direction that galaxy—in Milky Way disk, dark matter halo, LMC itself. The previous measurements, based on small statistical samples events, found is an order magnitude smaller than expected from entire halo form objects. However, these studies were not sensitive long-duration events with Einstein timescales longer 2.5–3...
We present the first microlensing candidate for a free-floating exoplanet–exomoon system, MOA-2011-BLG-262, with primary lens mass of Mhost ∼ 4 Jupiter masses hosting sub-Earth moon. The argument an exomoon hinges on system being relatively close to Sun. data constrain product MLπrel where ML is and πrel lens–source relative parallax. If nearby (large πrel), then small (a few masses) companion sub-Earth-mass exomoon. best-fit solution has large proper motion, μrel = 19.6 ± 1.6 mas yr−1,...
We present a detailed elemental abundance study of 90 F and G dwarf, turn-off, subgiant stars in the Galactic bulge. Based on high-resolution spectra acquired during gravitational microlensing events, stellar ages abundances for 11 elements (Na, Mg, Al, Si, Ca, Ti, Cr, Fe, Zn, Y Ba) have been determined. Four main findings are presented: (1) wide metallicity distribution with distinct peaks at [Fe/H] = −1.09, −0.63, −0.20, + 0.12, 0.41; (2) ahigh fraction intermediate-age to young where > 0...
We present the first example of binary microlensing for which parameter measurements can be verified (or contradicted) by future Doppler observations. This test is made possible a confluence two relatively unusual circumstances. First, lens bright enough (I=15.6) to permit measurements. Second, we measure not only usual 7 binary-lens parameters, but also 'microlens parallax' (which yields mass) and components instantaneous orbital velocity. Thus measure, effectively, 6 'Kepler+1' parameters...
Most stellar remnants so far have been found in binary systems, where they interact with matter from their companions. Isolated neutron stars and black holes are difficult to find as dark, yet predicted exist our Galaxy vast numbers. We explored the OGLE-III data base of 150 million objects observed years 2001–2009 59 microlensing events exhibiting a parallax effect due Earth's motion around Sun. Combining brightness measurements light curves expected proper motions Milky Way, we identified...
We combine Spitzer and ground-based observations to measure the microlens parallax vector , thus mass distance of OGLE-2014-BLG-0124L, making it first microlensing planetary system with a space-based measurement. The planet star have masses m ∼ 0.5 Mjup M 0.7 M☉ are separated by a⊥ 3.1 AU in projection. main source uncertainty all these numbers (approximately 30%, 20%) is relatively poor measurement Einstein radius θE, rather than πE, which measured 2.5% precision. This compares 22% based on...
We present a statistical analysis of the first four seasons from "second-generation" microlensing survey for extrasolar planets, consisting near-continuous time coverage 8 deg$^2$ Galactic bulge by OGLE, MOA, and Wise surveys. During this period, 224 events were observed all three groups. Over 12% showed deviation single-lens microlensing, $\sim$1/3 those anomaly is likely caused planetary companion. For each we have performed numerical ray-tracing simulations to calculate detection...
Because of the development large-format, wide-field cameras, microlensing surveys are now able to monitor millions stars with sufficient cadence detect planets. These new discoveries will span full range significance levels including planetary signals too small be distinguished from noise. At present, we do not understand where threshold is for detecting MOA-2011-BLG-293Lb first planet published surveys, and it also has substantial follow-up observations. This robustly detected in...
We have analyzed a sample of 27,258 fundamental-mode RR Lyrae variable stars (type RRab) detected recently toward the Galactic bulge by Optical Gravitational Lensing Experiment (OGLE) survey. The data support our earlier claim that these metal-poor trace closely barred structure formed intermediate-age red clump giants. distance to center (GC) inferred from is R_0=8.27+/-0.01(stat)+/-0.40(sys) kpc. show their spatial distribution has shape triaxial ellipsoid with an major axis located in...
We investigate interstellar extinction curve variations toward $\sim$4 deg$^{2}$ of the inner Milky Way in $VIJK_{s}$ photometry from OGLE-III and $VVV$ surveys, with supporting evidence diffuse bands $F435W,F625W$ photometry. obtain independent measurements $\sim$2,000 sightlines $A_{I}$, $E(V-I)$, $E(I-J)$, $E(J-K_{s})$, median precision accuracy 2%. find that ratios $A_{I}/E(V-I)$, $E(I-J)/E(V-I)$ $E(J-K_{s})/E(V-I)$ are large (exceeding 20%), significant, positively correlated, as...
Impolite planet ignores host's partner Many known exoplanets (planets outside our own solar system) are hosted by binary systems that contain two stars. These planets normally circle around both of their Using microlensing data taken with a worldwide network telescopes, Gould et al. found twice the mass Earth circles just one pair The same approach has potential to uncover other similar star and help illuminate some mysteries formation. Science , this issue p. 46
The Large Synoptic Survey Telescope is designed to provide an unprecedented optical imaging dataset that will support investigations of our Solar System, Galaxy and Universe, across half the sky over ten years repeated observation. However, exactly how LSST observations be taken (the observing strategy or "cadence") not yet finalized. In this dynamically-evolving community white paper, we explore detailed performance anticipated science expected depend on small changes strategy. Using...
We report the detection of a Cold Neptune m_planet=21+/-2MEarth orbiting 0.38MSol M dwarf lying 2.5-3.3 kpc toward Galactic center as part campaign combining ground-based and Spitzer observations to measure distribution planets. This is first time that complex real-time protocols described by Yee et al. (2015), which aim maximize planet sensitivity while maintaining sample integrity, have been carried out in practice. Multiple survey follow-up teams successfully combined their efforts within...