本文選題：原行星盤　切入點(diǎn)：塵埃生長(zhǎng)　出處：《天文學(xué)進(jìn)展》2012年03期

【摘要】：塵埃發(fā)射隨恒星年齡增加而降低的統(tǒng)計(jì)分析,硅酸鹽發(fā)射譜特征,塵埃盤光深等觀測(cè)證據(jù)都證明原行星盤中塵埃的生長(zhǎng)。在這個(gè)生長(zhǎng)過程中,最主要的生長(zhǎng)方式就是碰撞吸附。導(dǎo)致碰撞的因素有很多,由此產(chǎn)生的碰撞速度分布在一個(gè)很廣的范圍中。整個(gè)盤中塵埃的生長(zhǎng)過程不是同步進(jìn)行的,不同區(qū)域塵埃生長(zhǎng)的時(shí)標(biāo)不同,而盤中的物質(zhì)由于內(nèi)外流、沉淀等因素,不同區(qū)域之間的物質(zhì)存在交換,所以最終盤中物質(zhì)的碰撞過程同時(shí)存在多種可能。不同碰撞速度、大小、孔隙度的碰撞體之間碰撞的結(jié)果存在巨大差異,這些差異對(duì)塵埃生長(zhǎng)起了決定影響,而塵埃的生長(zhǎng)直接影響原行星盤的性質(zhì)以及盤中行星形成的過程。因此,研究塵埃在盤中的生長(zhǎng)過程,不但能夠深入了解原行星盤的性質(zhì),也能揭示行星形成早期物質(zhì)的演化過程。
[Abstract]:The statistical analysis of dust emission decreasing with the age of the star, the characteristics of silicate emission spectrum, the depth of dust disk and other observational evidence all prove the growth of dust in the original planetary disk. The most important growth pattern is collision adsorption. There are many factors leading to the collision, and the resulting collision velocity is distributed over a wide range. The entire dust growth process in the disk is not synchronized. The time scale of dust growth varies from region to region, and the matter in the disk is exchanged between different regions due to internal and external flow, sedimentation and other factors, so there are many possibilities for the collision process of the material in the disk at the same time. Different collision velocities, There are huge differences in the results of collisions between colliders of size and porosity, which have a decisive effect on the growth of dust, and the growth of dust directly affects the properties of the original planetary disk and the formation of planets in the disk. Studying the growth process of dust in disk can not only deeply understand the properties of the original planetary disk, but also reveal the evolution of the matter in the early stage of planetary formation.
【作者單位】： 中國(guó)科學(xué)院紫金山天文臺(tái);中國(guó)科學(xué)院研究生院;
【基金】：國(guó)家自然科學(xué)基金(10973044,10833001,10573040,10203005) 中國(guó)科學(xué)院新興與交叉學(xué)科布局試點(diǎn)項(xiàng)目(KJZD-EW-Z001) 江蘇省自然科學(xué)基金(BK2009341) 紫金山天文臺(tái)小行星基金會(huì)資助課題
【分類號(hào)】：P185

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