Planet migration in wind-fed accretion disks in binaries
Cornell University , 2019.
Popov S., Kulikova O. S., Zhuravlev V. V.
Planet migration originally refers to protoplanetary disks, which are more massive and dense than typical accretion disks in binary systems. We study planet migration in an accretion disk in a binary system consisting of a solar-like star hosting a planet and a red giant donor star. The accretion disk is fed by a stellar wind. %, disk self-gravity is neglected. We use the α-disk model and consider that the stellar wind is time-dependent. Assuming the disk is quasi-stationary we calculate its temperature and surface density profiles. In addition to the standard disk model, when matter is captured by the disk at its outer edge, we study the situation when the stellar wind delivers matter on the whole disc surface inside the accretion radius with the rate depending on distance from the central star. Implying that a planet experiences classical type I/II migration we calculate migration time for a planet on a circular orbit coplanar with the disk. Potentially, rapid inward planet migration can result in a planet-star merger which can be accompanied by an optical or/and UV/X-ray transient. We calculate timescale of migration for different parameters of planets and binaries. Our results demonstrate that planets can fall on their host stars within the lifetime of the late-type donor for realistic sets of parameters.
, , Monthly Notices of the Royal Astronomical Society 2019 Vol. 490 No. 2 P. 2390-2404
Orbits of close-in planets can shrink significantly due to dissipation of tidal energy in a host star. This process can result in star-planet coalescence within the Galactic lifetime. In some cases, such events can be accompanied by an optical or/and UV/X-ray transient. Potentially, these outbursts can be observed in near future with new facilities such ...
Added: October 15, 2019
, , , Monthly Notices of the Royal Astronomical Society 2019 Vol. 487 No. 3 P. 3069-3078
Planet migration originally refers to protoplanetary discs, which are more massive and dense than typical accretion discs in binary systems. We study planet migration in an accretion disc in a binary system consisting of a solar-like star hosting a planet and a red giant donor star. The accretion disc is fed by a stellar wind. ...
Added: June 26, 2019
, , , Astronomy Letters 2018 Vol. 44 No. 5 P. 324-330
The discovery of a terrestrial planet orbiting Proxima Centauri has led to a lot of papers discussing the possible conditions on this planet. Since the main factors determining space weather in the Solar System are the solar wind and cosmic rays (CRs), it seems important to understand what the parameters of the stellar wind, Galactic and stellar CRs ...
Added: November 2, 2018
, , et al., Monthly Notices of the Royal Astronomical Society 2020 Vol. 496 No. 4 P. 5052-5071
Ages and thermal luminosities of neutron stars, inferred from observations, can be interpreted with the aid of the neutron star cooling theory to gain information on the properties of superdense matter in neutron-star interiors. We present a survey of estimated ages, surface temperatures, and thermal luminosities of middle-aged neutron stars with relatively weak or moderately ...
Added: November 13, 2020
, , et al., Nature 2016 Vol. 529 No. 7584 P. 54-58
How black holes accrete surrounding matter is a fundamental yet unsolved question in astrophysics. It is generally believed that matter is absorbed into black holes via accretion disks, the state of which depends primarily on the mass-accretion rate. When this rate approaches the critical rate (the Eddington limit), thermal instability is supposed to occur in ...
Added: January 24, 2018
, , Monthly Notices of the Royal Astronomical Society 2020 Vol. 498 No. 4 P. 5149-5158
We study breaking stress of deformed Coulomb crystals in a neutron star crust, taking into account electron plasma screening of ion–ion interaction; calculated breaking stress is fitted as a function of electron screening parameter. We apply the results for analysing torsional oscillation modes in the crust of a non-magnetic star. We present exact analytical expression ...
Added: November 13, 2020
, , Monthly Notices of the Royal Astronomical Society 2022 Vol. 513 No. 3 P. 4082-4089
On the example of the hot Jupiter HD 189733b, in whose magnetosphere the conditions for the ’operation’ of an electron–cyclotron maser are not fulfilled, an analysis of the plasma mechanism of radio emission generation is carried out. The purpose of the analysis is to highlight the range of parameters at which the realization of a ...
Added: January 26, 2023
, , et al., Письма в Астрономический журнал 2022 Т. 48 № 12 С. 861-868
Представлены результаты исследования рентгеновского пульсара IGR J21343+4738 по данным наблюдений обсерваториями NuSTAR, Swift и СРГ в широком диапазоне энергий 0.3–79 кэВ. Отсутствие особенностей поглощения в энергетических спектрах источника, как усредненном, так и фазово-разрешенных, позволило оценить верхний и нижний пределы на магнитное поле нейтронной звезды в двойной системе B < 2.5 × 10^11 Гс и B ...
Added: December 12, 2022
, , Monthly Notices of the Royal Astronomical Society 2019 Vol. 490 No. 4 P. 5839-5847
We present an accurate analytic approximation for the energy of a quantum one-component Coulomb liquid of ions in a uniform electron background that has been recently calculated from first principles. The approximation enables us to develop in an analytic form a complete thermodynamic description of quantum ions in a practically important range of mass densities ...
Added: November 13, 2020
An Exo-Jupiter Candidate in the Eclipsing Binary FL Lyr Astronomy Reports, 2015, Vol. 59, No. 11, pp. 1035-1051
, , et al., Astronomy Reports 2015 Vol. 59 No. 11-12 P. 1036-1052
Light curves of the eclipsing binary FL Lyr acquired by the Kepler space telescope are analyzed. Eclipse timing measurements for FL Lyr testify to the presence of a third body in the system. Preliminary estimates of its mass and orbital period are 2MJ and 7 yrs. The times of primary minimum in the light curve of FL Lyr ...
Added: March 5, 2016
, , Monthly Notices of the Royal Astronomical Society 2018 Vol. 473 P. 3204-3210
Several candidates for accreting magnetars have been proposed recently by different authors. Existence of such systems contradicts the standard magnetic field decay scenario where a large magnetic field of a neutron star reaches ≲a few ×1013 G at ages ≳1 Myr. Among other sources, the high-mass X-ray binary 4U 0114+65 seems to have a strong ...
Added: November 15, 2018
, , et al., Photonics 2022 Vol. 9 No. 12 Article 950
Over the past decades, the achievements in astronomical instrumentation have given rise to a number of novel advanced studies related to the analysis of large arrays of observational data. One of the most famous of these studies is a study of transient events in the near and far space and a search for exoplanets. The ...
Added: June 26, 2023
Quality flags for GSP-Phot Gaia DR3 astrophysical parameters with machine learning: Effective temperatures case study
, , , Monthly Notices of the Royal Astronomical Society 2023 Article stad3601
Gaia Data Release 3 (DR3) provides extensive information on the astrophysical properties of stars, such as effective temperature, surface gravity, metallicity, and luminosity, for over 470 million objects. However, as Gaia’s stellar parameters in GSP-Phot module are derived through model-dependent methods and indirect measurements, it can lead to additional systematic errors in the derived parameters. ...
Added: November 23, 2023
, , et al., Monthly Notices of the Royal Astronomical Society 2021 Vol. 500 No. 4 P. 4491-4505
We study heat diffusion after an energy release in a deep spherical layer of the outer neutron star crust (107 ≲ ρ ≲ 4 × 1011 g cm-3). We demonstrate that this layer possesses specific heat-accumulating properties, absorbing heat and directing it mostly inside the star. It can absorb up to ∼1043-1044 erg due to ...
Added: October 22, 2021
, , et al., Astrophysical Bulletin 2022 Vol. 77 No. 4 P. 495-508
We present a brief description of a joint Russian-Korean project abbreviated as EXPLANATION (EXoPLANet And Transient events InvestigatiON). The project is aimed at a massive photometric, speckle-interferometric, spectral, and radio bolometric search for non-stationary events in the Universe, as well as the study of exoplanets. The core of the project consists of several 0.07–2.5-m optical ...
Added: June 26, 2023
, , et al., Astrophysical Bulletin 2022 Vol. 77 No. 4 P. 422-430
We present new results of the study of ET Dra—a star of the FK Com type — based on observations carried out at the Zvenigorod Observatory of the Institute of Astronomy of RAS with the help of the FRAM-ORM telescope of the La Palma observatory (Spain) and the broadband optical monitoring system Mini - MegaTORTORA, ...
Added: June 26, 2023
, , et al., Optoelectronics, Instrumentation and Data Processing 2017 Vol. 54 No. 1 P. 1-8
This paper presents an algorithm for processing the transmission spectra of whisperinggallery optical microcavities for use as a nanoparticle detector. The algorithm is based on the broadening of the microcavity resonance curve during precipitation of nanoparticles on the microcavity surface. Experimental results on the detection of particles are compared with Langmuir adsorption theory. The contribution ...
Added: May 25, 2018
Voyager 1/UVS Lyman alpha Measurements at the Distant Heliosphere (90–130 AU): Unknown Source of Additional Emission
, , et al., JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 2017 Vol. 122 No. 11 P. 10921-10937
In this work, we present for the first time the Lyman α intensities measured by Voyager 1/UVS in 2003–2014 (at 90–130 AU from the Sun). During this period Voyager 1 measured the Lyman α emission in the outer heliosphere at an almost fixed direction close to the upwind (i.e.“ toward the interstellar flow). The data show an unexpected behavior in 2003–2009: the ...
Added: January 26, 2018
, , Journal of High Energy Physics 2022 No. 01 Article 43
We study regularization scheme dependence of beta-function for sigma models with two-dimensional target space. Working within four-loop approximation, we conjecture the scheme in which the beta-function retains only two tensor structures up to certain terms containing zeta_3. Using this scheme, we provide explicit solutions to RG flow equation corresponding to Yang-Baxter- and lambda-deformed SU(2)/U(1) sigma ...
Added: February 1, 2022
Specific binding of the α-component of the lantibiotic lichenicidin to the peptidoglycan precursor lipid II predetermines its antimicrobial activity
, , et al., International Journal of Molecular Sciences 2023 Vol. 24 No. 2 P. 1
To date, a number of lantibiotics have been shown to use lipid II — a highly conserved peptidoglycan precursor in the cytoplasmic membrane of bacteria — as their molecular target. The α-component (Lchα) of the two-component lantibiotic lichenicidin (Lchα), previously isolated from the Bacillus licheniformis VK21 strain, seems to contain two putative lipid II binding ...
Added: February 21, 2023
, , Scientific Reports 2018 Vol. 8 No. 1 P. 16915-1-16915-18
Sequential state discrimination is a strategy for quantum state discrimination of a sender’s quantum states when N receivers are separately located. In this report, we propose optical designs that can perform sequential state discrimination of two coherent states. For this purpose, we consider not only binary phase-shifting-key (BPSK) signals but also general coherent states, with arbitrary prior probabilities. Since ...
Added: November 16, 2020
М. : National Instruments Russia, 2017
Содержание сборника составляют доклады с результатами оригинальных исследований и технических решений, ранее не публиковавшиеся. Мы надеемся, что предлагаемый сборник окажется полезным для специалистов, работающих в различных областях науки и техники, для широкого круга преподавателей, аспирантов и студентов ВУЗов, а также для преподавателей средних школ и технических колледжей. ...
Added: May 10, 2017
, , et al., The European Physical Journal C - Particles and Fields 2023 No. 83 P. 543-562
Added: December 4, 2023
, , Physical Review B: Condensed Matter and Materials Physics 2020 Vol. 102 Article 155411
We calculate the electrical and thermal conductivity of a two-dimensional electron gas with strong spin-orbit coupling in which the scattering is dominated by electron-electron collisions. Despite the apparent absence of Galilean invariance in the system, the two-particle scattering does not affect the electrical conductivity above the band-crossing point where both helicity bands are filled. Below the band-crossing point ...
Added: October 14, 2021