Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..11e..23k&link_type=abstract
Pre-Solar Grains as Astrophysical Tools, 26th meeting of the IAU, Joint Discussion 11, 21 August 2006, Prague, Czech Republic, J
Astronomy and Astrophysics
Astrophysics
Scientific paper
Now a problem of planetesimals' formation (comets nuclei), that are on orbits with large eccentricity, is still open. We propose hypothesis whereby fragments of Olbers' planet, that was destructed into drops of melted matter some billions years ago, serve as seeds for comets nuclei. Some fragments of destroyed planet moving through the substance of protoplanetary disk individually or as a swarm of little particles (like fragments of exploded volcanic bomb) heaped substance on itself. Therefore, the mass of this objects was increased. Due to accumulation of snowflakes of volatilities in protoplanetary disk the impulse of composed object was changing. Consequently, its orbit was changing too, so finally the resulting orbit had to be elliptical and belongs to the Kuiper Belt. Process of planetesimals growth was limited by time of existing of primary protoplanetary disk that was swept by solar radiation. A computer simulation of growth of comet nuclei and its orbit for various initial parameters is presented. Models are based on initial parameters - inclination of swallows orbit to the plane of protoplanetary disk, mass of the swallow and total number of its elements, initial velocity of the swallow, parameters of external parts of protoplanetary disk and the time of calculated process. Some of these parameters are free. Computer simulation results in final orbit parameters of these objects and in ratio of total mass of planetesimal to the initial mass of swallow. Simulation shows good agreement between final characteristics of model objects and of real comets from the Kuiper Belt. Best agreement has been attained for initial velocities ~ 25 km/sec, that are in the plane of disk, initial mass about 2ṡ10^ 12 kg and area of cut 200-400 square km. Orbit of this object has eccentricity 0.2-0.4, and semiaxis 11-50 a.e. Presented simulation is a weighty argument for reality of proposed mechanism of comet nuclei formation. As remnants of died comets are meteoroids streams, measurements of initial comet mass and final mass of meteoroids would allow reconstruction of conditions of the earliest events in the Solar System history.
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