Convection and mixing in giant planet evolution

A. Vazan, R. Helled, A. Kovetz, M. Podolak

نتاج البحث: نشر في مجلةمقالةمراجعة النظراء


The primordial internal structures of gas giant planets are unknown. Often giant planets are modeled under the assumption that they are adiabatic, convective, and homogeneously mixed, but this is not necessarily correct. In this work, we present the first self-consistent calculation of convective transport of both heat and material as the planets evolve. We examine how planetary evolution depends on the initial composition and its distribution, whether the internal structure changes with time, and if so, how it affects the evolution. We consider various primordial distributions, different compositions, and different mixing efficiencies and follow the distribution of heavy elements in a Jupiter-mass planet as it evolves. We show that a heavy-element core cannot be eroded by convection if there is a sharp compositional change at the core-envelope boundary. If the heavy elements are initially distributed within the planet according to some compositional gradient, mixing occurs in the outer regions resulting in a compositionally homogeneous outer envelope. Mixing of heavy materials that are injected in a convective gaseous envelope are found to mix efficiently. Our work demonstrates that the primordial internal structure of a giant planet plays a substantial role in determining its long-term evolution and that giant planets can have non-adiabatic interiors. These results emphasize the importance of coupling formation, evolution, and internal structure models of giant planets self-consistently.

اللغة الأصليةالإنجليزيّة
رقم المقال32
دوريةAstrophysical Journal
مستوى الصوت803
رقم الإصدار1
المعرِّفات الرقمية للأشياء
حالة النشرنُشِر - 10 أبريل 2015
منشور خارجيًانعم

ملاحظة ببليوغرافية

Publisher Copyright:
© 2015. The American Astronomical Society. All rights reserved.


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