History of the solar nebula from meteorite paleomagnetism.

History of the solar nebula from meteorite paleomagnetism.
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DOI:
10.1126/sciadv.aba5967
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发表时间:
2021-01
期刊:
影响因子:
13.6
通讯作者:
Fu RR
Fu RR
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Weiss BP;Bai XN;Fu RR

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陨石测量表明,在早期的太阳系中,磁性在物质运输中发挥了核心作用。本文综述了太阳星云和原行星盘(PPD)磁性研究的最新进展。我们讨论了行星形成和星云演化的理论,陨石测量和天文观测的影响。古地磁测量表明,在太阳系形成后的122万年和251万年前,在距离太阳约1至3天文单位(Au)处存在0.54 ± 0.21 G的磁场,在距离太阳3至7 Au处存在0.06 G的磁场。这些强度与天文学上观测到的典型原恒星吸积速率约为10−8 M·year−1的预测一致,表明磁性在PPD的质量传输中发挥了核心作用。古地磁研究还表明,太阳系内外的磁场分别在3.94和4.89 Ma时<0.006 G和<0.003 G,这与星云气体在此时已经分散一致。这与观测到的太阳系外原行星盘的寿命相似。
Meteorite measurements suggest that magnetism played a central role in mass transport in the early solar system. We review recent advances in our understanding of magnetism in the solar nebula and protoplanetary disks (PPDs). We discuss the implications of theory, meteorite measurements, and astronomical observations for planetary formation and nebular evolution. Paleomagnetic measurements indicate the presence of fields of 0.54 ± 0.21 G at ~1 to 3 astronomical units (AU) from the Sun and ≳0.06 G at 3 to 7 AU until >1.22 and >2.51 million years (Ma) after solar system formation, respectively. These intensities are consistent with those predicted to enable typical astronomically observed protostellar accretion rates of ~10−8 M⊙year−1, suggesting that magnetism played a central role in mass transport in PPDs. Paleomagnetic studies also indicate fields <0.006 G and <0.003 G in the inner and outer solar system by 3.94 and 4.89 Ma, respectively, consistent with the nebular gas having dispersed by this time. This is similar to the observed lifetimes of extrasolar protoplanetary disks.
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