Numerical simulations of the production of extinct short-lived nuclides by magnetic flaring in the early solar system

被引:6
|
作者
Sahijpal, S. [1 ]
Soni, P. [1 ]
机构
[1] Punjab Univ, Dept Phys, Chandigarh 160014, India
关键词
D O I
10.1111/j.1945-5100.2007.tb01147.x
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Using the X-ray flare observations of low-mass protostars, we developed numerical simulations of thermal processing and irradiation of protoCAls in the magnetic reconnection ring within the X-wind formulation. Observed X-ray flare luminosities have been used to model various simulation flare characteristics. Several approximations have been made regarding the thermal evolution that involve condensation, evaporation, and coagulation of protoCAls. Ensembles of refractory cores with ferromagnesian mantles were evolved for irradiation production of the short-lived nuclides Be-7, Be-10, Ca-41, Cl-36, Al-26, and Mn-53. Three distinct grain-size distributions of protoCAls with refractory cores in the ranges of 32 mu m-20 mm, 125 mu m-16 mm, and 500 mu m-13 mm were thermally evolved for irradiation. The latter two size distributions were found to result in the accumulation of protoCAls in the reconnection ring during an X-wind cycle, and hence can account for the total inventory of Al-26 in the early solar system. The canonical value of similar to 5 x 10(-5) for Al-26/Al-27 can be inferred from the impulsive flare simulations by a suitable choice of simulation parameters. However, in most of the remaining simulations, the irradiation of protoCAls by superflare(s) with Lx > 10(32)ergs s(-1) subsequent to their thermal processing in the reconnection ring would be required to explain the experimental abundances of the short-lived nuclides. These superflares have never been reliably observed in young stellar objects. If they are real, they would be extremely rare. The paucity of these superflares could impose stringent constraints on the validity of the X-wind irradiation scenario as the source of the short-lived nuclides.
引用
收藏
页码:1005 / 1027
页数:23
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