A5059712743- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Space Satellite Systems and Control
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Adaptive optics and wavefront sensing
- Astro and Planetary Science
- Advanced machining processes and optimization
- Manufacturing Process and Optimization
- Astrophysical Phenomena and Observations
- Quantum chaos and dynamical systems
- Nonlinear Dynamics and Pattern Formation
- Engineering Technology and Methodologies
- Chaos control and synchronization
- Spacecraft Design and Technology
- Advanced Surface Polishing Techniques
- Spacecraft Dynamics and Control
- Planetary Science and Exploration
- Galaxies: Formation, Evolution, Phenomena
- Injection Molding Process and Properties
- Structural Health Monitoring Techniques
- History and Developments in Astronomy
- Impact of Light on Environment and Health
Skolkovo Institute of Science and Technology
2018-2022
Bauman Moscow State Technical University
2014-2017
Murmansk State Technical University
2015
Lawrence Livermore National Laboratory
2002-2013
Campbell Collaboration
2009
Tel Aviv University
2008
Blue Planet (Norway)
2008
Saratov State University
2006-2008
University of Notre Dame
2008
University of Warsaw
2008
Searches for extrasolar planets have uncovered an astonishing diversity of planetary systems, yet the frequency solar system analogs remains unknown. The gravitational microlensing planet search method is potentially sensitive to multiple-planet systems containing all except Mercury. We report detection a with microlensing. identify two masses ∼0.71 and ∼0.27 times mass Jupiter orbital separations ∼2.3 ∼4.6 astronomical units orbiting primary star ∼0.50 at distance ∼1.5 kiloparsecs. This...
Characterizing the nature and spatial distribution of lensing objects that produce previously measured microlensing optical depth toward Large Magellanic Cloud (LMC) remains an open problem. We present appraisal ability SuperMACHO Project, a next-generation survey directed LMC, to discriminate between various proposed populations. consider two scenarios: by uniform foreground screen self-lensing LMC stars. have carried out extensive simulations, based upon data obtained during first year...
We present a morphological analysis of the feature-rich 2MASS LMC color-magnitude diagram, identifying Galactic and populations estimating density alone. also projected spatial distributions various stellar populations. The conditions that prevailed when observed provided 10 σ limiting sensitivity for J ≲ 16.3, H 15.3, Ks 14.7. Major are identified based on matching features diagram with expected positions known populations, isochrone fits, distributions. has detected significant population...
We present a detailed study of the viewing angles and geometry inner LMC (ρ ≲ 4°) based on sample more than 2000 MACHO Cepheids with complete {VR}KC light curves single-phase Two Micron All Sky Survey (2MASS) JHKs observations. The is considerably larger any previously studied subset has an improved areal coverage. Single-epoch random-phase 2MASS photometry corrected using V to derive mean magnitudes. analyze resulting period-luminosity relations in VRJHKs recover statistical reddening...
We present a new analysis of the Jupiter+Saturn analog system, OGLE-2006-BLG-109Lb,c, which was first double planet system discovered with gravitational microlensing method. This is only multi-planet by any method measured masses for star and both planets. In addition to signatures two planets, this event also exhibits parallax signature finite source effects that provide direct measure expected brightness host confirmed Keck AO imaging, yielding M_* = 0.51(+0.05-0.04) M_sun, M_b 231+-19...
We report the successful identification of type supernova responsible for remnant SNR 0509-675 in Large Magellanic Cloud (LMC) using Gemini spectra surrounding light echoes. The ability to classify outbursts associated with centuries-old remnants provides a new window into several aspects research and is likely be providing constraints on additional LMC supernovae as well their historical counterparts Milky Way Galaxy (MWG). combined spectrum echo from shows broad emission absorption lines...
We report the discovery of a supernova (SN) with highest apparent energy output to date and conclude that it represents an extreme example Type IIn subclass. The SN, which was discovered behind Large Magellanic Cloud at z = 0.289 by SuperMACHO microlensing survey, peaked M_R -21.5 mag only declined 2.9 over 4.7 years after peak. Over this period, SN 2003ma had integrated bolometric luminosity 4 x 10^51 ergs, more than any other date. radiated is close limit allowed conventional core-collapse...
The potential benefits of using small satellites are expected to increase if they operated in groups form "virtual" satellites, which have the same functionality a much larger satellite but at fraction cost. Unfortunately, due third body gravitational forces, solar radiation pressure, and other perturbing will drift apart no control mechanism is employed maintain formation. This work describes passive technique that uses differential aerodynamic forces experienced by two spacecraft exert...
We derive structural parameters and evidence for extended tidal debris from star count preliminary standard candle analyses of the Large Magellanic Cloud based on Two Micron All Sky Survey (2MASS) data. The full-sky coverage low extinction in K_s presents an ideal sample analysis LMC. surface densities deprojected inclination both young older populations are consistent with previous work. use full areal large LMC diameter to Galactrocentric distance ratio infer same value disk perspective. A...
(abridged) Recent studies, using OGLE data for LMC Cepheids in the optical, strongly suggest that period-luminosity (PL) relation Large Magellanic Cloud (LMC) shows a break or non-linearity at period of 10 days. In this paper we apply statistical tests, chi-square test and F-test, to Cepheid from MACHO project V- R-band PL relations days, extend these tests near infrared (JHK-band) with 2MASS data. We correct extinction by applying an map towards LMC. The use, is able take account small...
We propose a new autonomous dynamical system of dimension N = 4 that demonstrates the regime stable two-frequency motions and period-doubling bifurcations two-dimensional torus. It is shown bifurcation torus not followed by resonance phenomenon, ergodic undergoes bifurcation. The interaction two generators also analyzed. phenomenon external mutual synchronization oscillations observed, for which winding number locking on takes place.
The peculiarities of external synchronization a resonant limit cycle on torus are studied in an autonomous oscillator quasiperiodic oscillations with two basic frequencies. We show numerically and experimentally that the resonance conditions effect takes place only at one frequencies system, while second frequency remain unsynchronized. Our results convincingly indicate principal difference between typical cycle. This is contrast to well-established theory finding opens new strategies for...
We study synchronization of a resonant limit cycle on two-dimensional torus with an external harmonic signal. The regime the is realized in system two coupled Van der Pol oscillators; we consider resonances 1:1 and 1:3. analyze influence coupling strength between oscillators. show that can be generally synchronized through resonance destruction followed by locking one then another basic frequencies. bifurcational mechanism effect.
We present a set of 11 type Ia supernova (SN Ia) lightcurves with dense, pre-maximum sampling. These supernovae (SNe), in galaxies behind the Large Magellanic Cloud (LMC), were discovered by SuperMACHO survey. The SNe span redshift range z = 0.11 - 0.35. Our contain some earliest observations to date. also give functional model that describes SN lightcurve shape (in our VR-band). function uses "expanding fireball" Goldhaber et al. (1998) describe rising immediately after explosion but...
Previous work reported a bar signature in color-selected IRAS variable stars. Here, we estimate the source density of these variables while consistently accounting for spatial incompleteness data using likelihood approach. The existence is confirmed with shoulder at ≈ 3 kpc, an axis ratio a:b = 2.2-2.7, and position angle 19° ± 1°. nonaxisymmetric to axisymmetric components gives similar size 3.3 0.1 kpc ϕ0 24° 2°. We scale length 4.00 0.55 population, suggesting that stars represent old...
In this paper, we recalibrate the Cepheid distance to some nearby galaxies observed by HST Key Project and Sandage-Tammann-Saha group. We use much of methodology in our analysis but apply new techniques, based on Fourier methods estimate mean a sparsely sampled light curve, published extra-galactic data. also different calibrating PL relations distances, investigate sensitivity moduli adopted relation. re-determine OGLE LMC using more conservative approach study effect Galactic scale. For...
Fourier decomposition is a well-established technique used in the study of stellar pulsation. However, quality reconstructed light curves using this method reduced when observed data have uneven phase coverage. We use simulated annealing techniques together with to improve for many Optical Gravitational Lensing Experiment LMC fundamental-mode Cepheids. This restricts range that amplitudes can take. The ranges are specified by well-sampled Cepheids Galaxy and Magellanic Clouds. also apply...
We present results from the application of a global photometric calibration (GPC) procedure to data first 2 years Two Micron All Sky Survey (2MASS). The GPC algorithm uses photometry both primary standards and moderately bright "tracer" stars in 35 2MASS fields. During survey, each standard was observed on approximately 50 nights, with about 900 individual measurements. Based secondary tracer under assumption that nightly zero-point drift is linear, ties together all fields survey nights...
We present 2323 high-amplitude δ-Scuti (HADS) candidates discovered in the Large Magellanic Cloud by SuperMACHO survey (Rest et al.). Frequency analyses of these reveal that several are multimode pulsators, including 119 whose largest amplitude pulsation is fundamental (F) mode and 19 first overtone (FO) mode. Using Fourier decomposition HADS light curves, we find period–luminosity (PL) relation defined FO pulsators does not show a clear separation from PL F pulsators. This differs other...
The Space-based Telescopes for Actionable Refinement of Ephemeris (STARE) program will collect the information needed to help satellite operators avoid collisions in space by using a network nanosatellites determine more accurate trajectories selected objects orbiting Earth. In first phase STARE program, two pathfinder cube-satellites (CubeSats) equipped with an optical imaging payload are being developed and deployed demonstrate main elements concept. We give overview program. details...
We propose a new autonomous dynamical system of dimension N = 4 that demonstrates the regime stable two-frequency motions. It is shown two generators quasiperiodic oscillations with symmetric coupling can realize motions on four-dimensional torus resonant structures it in form three- and two-dimensional torus. show increase noise intensity when higher destroyed faster.