D. Cheryasov
A5010011056- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- Geophysics and Gravity Measurements
- Astro and Planetary Science
- Solar and Space Plasma Dynamics
- Astrophysical Phenomena and Observations
- Neutrino Physics Research
- Calibration and Measurement Techniques
- Dark Matter and Cosmic Phenomena
- Atmospheric Ozone and Climate
- GNSS positioning and interference
- Particle Detector Development and Performance
- Atmospheric aerosols and clouds
- Optical Systems and Laser Technology
- Meteorological Phenomena and Simulations
- Photonic and Optical Devices
- Optical measurement and interference techniques
- Photocathodes and Microchannel Plates
- Gyrotron and Vacuum Electronics Research
Lomonosov Moscow State University
2014-2024
Abstract The Transiting Exoplanet Survey Satellite (TESS) has discovered hundreds of new worlds, with TESS planet candidates now outnumbering the total number confirmed planets from Kepler. Owing to differences in survey design, continues provide that are better suited for subsequent follow-up studies, including mass measurement through radial velocity (RV) observations, compared Kepler targets. In this work, we present TESS-Keck Survey’s (TKS) Mass Catalog: a uniform analysis all TKS RV...
Context . Short-period giant planets ( P ≲ 10 days, M p >0.1 J ) are frequently found to be solitary compared other classes of exo-planets. Small inner companions with 15 days known only in five compact systems: WASP-47, Kepler-730, WASP-132, TOI-1130, and TOI-2000. Here, we report the confirmation TOI-5398, youngest multi-planet system composed a hot sub-Neptune (TOI-5398 c, c = 4.77271 days) orbiting interior short-period Saturn b, b 10.590547 planet, both transiting around 650 ± 150...
We present the results of atmospheric optical turbulence (OT) measurements performed atop Mount Shatdzhatmaz at installation site new 2.5 m telescope Sternberg Astronomical Institute. Nearly 300,000 vertical OT profiles from ground up to an altitude 23 km were obtained in period 2007 November–2013 June 2 with combined multiaperture scintillation sensor (MASS) and differential image motion monitor (DIMM) instrument. The medians main characteristics, computed over whole dataset are as follows:...
Planets with orbital periods shorter than 1 day are rare and have formation histories that not completely understood. Small ( R p < 2 ⊕ ) ultra-short-period (USP) planets highly irradiated, probably rocky compositions high bulk densities, often found in multi-planet systems. Additionally, USP around small stars excellent candidates for characterization using present-day instrumentation. Of the current full sample of approximately 5500 confirmed exoplanets, only 130 40 mass radius...
Abstract This article presents the early results of synchronous multiwavelength observations one brightest gamma-ray bursts (GRBs) GRB 160625B with detailed continuous fast optical photometry its counterpart obtained by MASTER and hard X-ray emission, Lomonosov Konus-Wind spacecraft. The led us to detect quasi-periodical emission components in intrinsic emission. As a result our analysis observations, we propose three-stage collapse scenario for this long bright GRB. We suggest that...
The photometric sky quality of Mt Shatdzhatmaz, the site Sternberg Astronomical Institute Caucasian Observatory 2.5-m telescope, is characterized here by statistics night-time brightness and extinction. data were obtained as a by-product atmospheric optical turbulence measurements with MASS (Multi-Aperture Scintillation Sensor) device conducted in 2007–2013. factors biasing night-sky are considered technique to reduce their impact on proposed. single-band estimations provided easy transform...
Speckle polarimeter (SPP) is a facility instrument of the 2.5-m telescope Caucasian Mountain Observatory SAI MSU. By design it combination speckle interferometer and dual--beam polarimeter. In 2022 we performed major upgrade instrument. New version features Hamamatsu ORCA-Quest qCMOS C15550-20UP, having subelectron readout noise, as main detector, opposed to EMCCD Andor iXon 897 used in previous version. Optical distortions present are considered they directly affect accuracy interferometric...
We report the confirmation and characterization of four hot Jupiter-type exoplanets initially detected by TESS: TOI-1295 b, TOI-2580 TOI-6016 TOI-6130 b. Using observations with high-resolution echelle spectrograph MaHPS on 2.1 m telescope at Wendelstein Observatory, together NEID Kitt Peak National Observatory TRES Fred Lawrence Whipple we confirmed planetary nature these planet candidates. also performed precise mass measurements. All planets are found to be Jupiters orbital periods...
Polarimetric interferometry is a method allowing the study of distribution polarized flux at diffraction-limited resolution. Its basic observable ratio $\mathcal{R}$ visibilities object in two orthogonal polarizations. Here, we demonstrate how this observables can be measured with SPeckle Polarimeter (SPP) 2.5-m telescope. The SPP combination dual-beam polarimeter and an EMCCD-based visible-range speckle interferometer. We propose simple for correction instrumental polarization differential...
Planets with orbital periods shorter than 1 day are rare and have formation histories that not completely understood. Small ($R_\mathrm{p} < 2\; R_\oplus$) ultra-short-period (USP) planets highly irradiated, probably rocky compositions high bulk densities, often found in multi-planet systems. Additionally, USP around small stars excellent candidates for characterization using present-day instrumentation. Of the current full sample of approximately 5500 confirmed exoplanets, only 130 40 mass...
A strong global magnetic field of young low-mass stars and a high accretion rate are the necessary conditions for formation collimated outflows (jets) from these objects. But it is still unclear whether also sufficient. We aim to check BP Tau, an actively accreting star with field, has jet. carried out narrowband SII 672 nm imaging spectroscopic observations Tau its vicinity. find that source Herbig-Haro flow (assigned number HH 1181), which includes two objects moving in opposite directions...
Context. A strong global magnetic field of young low-mass stars and a high accretion rate are the necessary conditions for formation collimated outflows (jets) from these objects. But it is still unclear whether also sufficient. Aims. We aim to check BP Tau, an actively accreting star with field, has jet. Methods. carried out narrowband [S II ] 672 nm imaging spectroscopic observations Tau its vicinity. Results. find that source Herbig-Haro flow (assigned number HH 1181), which includes two...
The TESS mission searches for transiting exoplanets by monitoring the brightness of hundreds thousands stars across entire sky. M-type planet hosts are ideal targets this due to their smaller size and cooler temperatures, which makes it easier detect planets near or within habitable zones. Additionally, M dwarfs have a contrast ratio between star, making measure planet’s properties accurately. Here, we report validation analysis 13 exoplanet candidates orbiting around dwarfs. We studied...
The TESS mission searches for transiting exoplanets by monitoring the brightness of hundreds thousands stars across entire sky. M-type planet hosts are ideal targets this due to their smaller size and cooler temperatures, which makes it easier detect planets near or within habitable zones. Additionally, M~dwarfs have a contrast ratio between star, making measure planet's properties accurately. Here, we report validation analysis 13 exoplanet candidates orbiting around M dwarfs. We studied...
Short-period giant planets are frequently found to be solitary compared other classes of exoplanets. Small inner companions with $P \lesssim$ 15 days known only in five compact systems: WASP-47, Kepler-730, WASP-132, TOI-1130, and TOI-2000. Here, we report the confirmation TOI-5398, youngest multi-planet system composed a hot sub-Neptune (TOI-5398 c, $P_{\rm c}$ = 4.77271 days) orbiting interior short-period Saturn b, b}$ 10.590547 planet, both transiting around 650 $\pm$ 150 Myr G-type...