Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..11e..15b&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
The generally accepted planetary cosmogony supposes that planets' formation took place under conditions determined by radiation of the central star. Nevertheless, its influence on protoplanetary disk considered being low, so the protoplanetary substance would not clip away for the time of planets' formation (about 10^7 ÷ 10^9^ yrs). An examination of this statement is the aim of presentation. Calculations of total sweeping out time of protoplanetary substance from the central area of the Solar system are presented. The Solar radiation was supposed to be stable and equal to its modern level - about 4*10^33 erg/sec. Initial parameters of protoplanetary disk were taken from classical planetary cosmogony (the thickness of disk is 10^6 km, surface density in this area is uniform: 10-12 gr/cm^2). Physical model of interaction of protoplanetary disk and solar radiation is quite simple. The radiation flux from the Sun inside narrow angular band occupied by disk was totally absorbed by its inner part due to its large opacity. Heated by absorbed energy gas and dust increased in volume and produced "edging" at the inner border of the disk. The "edging" will be ejected by additional radiation flux inside widened spatial angle of edging. So described process consists of two independent phases: arising of edging and its sweeping out. Our calculations show that whole process of ejection of "edging" to the periphery of the system lasts 7000-10000 years. The calculated traverse speed of warming-up area throw the disk is not constant, but it is not less than 10^4 km/year. So estimation of protoplanetary life time since the beginning of stellar activity of central body is in order of 10^5-5ṡ10^5 yrs. It is majority estimation, because we didn't consider the T-Taurus stage of the newly burned star that accelerates the process. Hence, the cosmogony of planetary system under sunshine has to be revised, as the lifetime of protoplanetary disk is too short for planetesimales formation in the vicinity of normal star.
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