A5056926929- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Planetary Science and Exploration
- Spacecraft Dynamics and Control
- Quantum chaos and dynamical systems
- Scientific Research and Discoveries
- Geomagnetism and Paleomagnetism Studies
- Space Science and Extraterrestrial Life
- Space Exploration and Technology
- Chaos control and synchronization
- Geophysics and Gravity Measurements
- semigroups and automata theory
- High-pressure geophysics and materials
- Nuclear physics research studies
- graph theory and CDMA systems
- Computability, Logic, AI Algorithms
- Astronomical and nuclear sciences
- Mathematical Dynamics and Fractals
- Geology and Paleoclimatology Research
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astrophysical Phenomena and Observations
- Protein Structure and Dynamics
University of Vienna
2014-2023
University of Graz
2014-2015
Netherlands Institute for Radio Astronomy
2010
Purple Mountain Observatory
2007
Institute of Astronomy
2004
Centre National de la Recherche Scientifique
1999
Observatoire de la Côte d’Azur
1999
In the near future, space missions will be launched (e.g. COROT, KEPLER) to detect Earth-like extrasolar planets. The orbital elements of these (still hypothetic) planets contain some uncertainties that can only eliminated by careful dynamical investigations hosting planetary systems. proportion systems with one known giant planet is high (∼90 per cent). Therefore, as a first step we have investigated possible existence terrestrial in this paper, development stability catalogue habitable...
<i>Aims. <i/>We investigate the dynamical stability of compact planetary systems in CoRoT discovery space, i.e., with orbital periods less than 50 days, including a detailed study systems, which are spaced according to Hill's criteria.<i>Methods. <i/>The innermost fictitious planet was placed close Roche limit from star (<i>M<i/><sub>Star<sub/> = 1 <i>M<i/><sub>Sun<sub/>) and all other planets lined up criteria distance 0.26 AU, corresponds day period for Sun-massed star. For masses planets,...
Binary and multiple systems constitute more than half of the total stellar population in Solar neighborhood (Kiseleva-Eggleton Eggleton 2001). Their frequent occurrence as well fact that 70 (Schneider et al. 2011) planets have already been discovered such configurations - most noteably telluric companion alpha Centauri B (Dumusque 2012) make them interesting targets search for habitable worlds. Recent studies (Eggl 2012b, Forgan shown, despite variations gravitational radiative environment,...
We investigate the stability regions of hypothetical terrestrial planets around Lagrangian equilibrium points L4 and L5 in some specific extrasolar planetary systems. The problem their can be treated framework restricted three body where host star a massive Jupiter-like planet are primary bodies is regarded as being massless. From these theoretical investigations one cannot determine extension stable zones points. Using numerical experiments we determined largeness for test systems chosen...
We treat the problem of stability planetary orbits in double stars with aid numerical studies model elliptic restricted three–body problem. Many investigations exist for limits S-type motion (i.e. around one component binary). In this paper we present a investigation so-called P-type which are defined as planet both primary masses. The growing interest such is due to discovery numerous extra-solar planets, where five them move star systems. Two different methods used; first study was...
In close eclipsing binaries, measurements of the variations in binary's eclipse timing may be used to infer information about existence circumbinary objects. To determine possibility detection such with CoRoT and Kepler space telescopes, we have carried out an extensive study dynamics a binary star system planet, calculated its (ETVs) for different values mass ratio orbital elements perturbing body. Here, present results our assess detectability planet by comparing resulting ETVs temporal...
With more and extrasolar planets discovered in around binary star systems, questions concerning the determination of classical Habitable Zone arise. Do radiative gravitational perturbations second influence extent significantly, or is it sufficient to consider host-star only? In this article we investigate implications stellar companions with different spectral types on insolation a terrestrial planet receives orbiting Sun-like primary. We present time independent analytical estimates...
We present a survey on exoplanetary systems of binary stars with stellar separations less than 100 au. For sample 11 binaries that harbour detected circumstellar giant planets we investigate the frequency secular resonances (SR) affecting habitable zone (HZ). Secular are connected to dynamically unstable or chaotic regions by enforcing highly eccentric motion. apply semi-analytical method determine locations linear SR, which is based finding apsidal precession frequencies massive bodies....
Aims. We investigate the influence of impacts large planetesimals and small planetary embryos on early Martian surface hydrodynamic escape an steam atmosphere that is exposed to high soft X-ray extreme-ultraviolet (EUV) flux young Sun.
The recently discovered planetary system in the binary γ Cep was studied concerning its dynamical evolution. We confirm that orbital parameters found by observers are a stable configuration. primary aim of this study to find orbits habitable region system, which consists double star ( AU) and relatively close massive () planet. did straightforward numerical integrations equations motion different models determined stability regions for fictitious massless planet interval semimajor axis...
Given the considerable percentage of stars that are members binaries or stellar multiples in solar neighborhood, it is expected many these host planets, possibly even habitable ones. The discovery a terrestrial planet α Centauri system supports this notion. Due to potentially strong gravitational interaction an Earth-like may experience such systems, classical approaches determining zones (HZ), especially close S-type binary can be rather inaccurate. Recent progress field, however, allows us...
Context. In binary star systems, the winds from two components impact each other, leading to strong shocks and regions of enhanced density temperature. Potentially habitable circumbinary planets must continually be exposed these interactions regions. Aims. We study, for first time, between low-mass stars in a system, show wind conditions seen by potentially planets. Methods. use advanced 3D numerical hydrodynamic code Nurgush model identical solar mass with circular orbits separation 0.5 AU....
Using numerical methods we thoroughly investigate the dynamical stability in region between two planets found HD 74156. The with minimum masses 1.56 M_JUP (HD 74156b) and 7.5 74156c), semimajor axes 0.276 AU 3.47 move on quite eccentric orbits (e=0.649 0.395). There is a 0.7 1.4 which may host additional checked via integrations using different models. Besides orbital evolution of several thousands massless regarded three-dimensional restricted 4-body problem (host star, + bodies) also have...
The dynamical structure of the habitable zone in multiple exoplanetary systems HD 38529, 168443 and 169830 is investigated. By using long-time numerical integration fast chaos-detection methods, it shown that all three mostly chaotic. There a stable region between two known planets only system near inner edge zone, where third planet could exist. This for wide range orbital eccentricity mass larger outer planet. stability divided by higher-order mean motion resonances, which are studied...
We present a numerical study of several two-planet systems based on the motions Jupiter and Saturn, in which two giant planets move low eccentric orbits close to mean motion resonance. It is more likely find with similar characteristics system than clone Jupiter-Saturn pair our solar system. Therefore, we vary distance between their mass ratio by changing Saturn's semimajor axis from 8 11 AU increasing its factors 2-40. The different two-planets were analyzed for interacting perturbations...
The problem of the stability planetary systems, a question that concerns only multiplanetary systems host at least two planets, is discussed. mean motion resonances addressed prior to discussion dynamical structure more than 350 known planets. difference with regard our own Solar System eight planets on low eccentricity evident in 60% extrasolar have orbits e > 0.2. We theoretically highlight studies concerning possible terrestrial Jupiter-like planet. emphasize an orbit particular nature...
ABSTRACT Gravitational perturbations in multi-planet systems caused by an accompanying star are the subject of this investigation. Our dynamical model is based on binary HD 41004 AB where a giant planet orbits A. We modify orbital parameters system and analyze motion hypothetical test surrounding A interior orbit to detected planet. numerical computations indicate due mean secular resonances (SRs). The locations these usually connected high eccentricity highly inclined depending strongly...