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Architectures of Compact Super-Earth Systems Shaped by Instabilities

Goldberg, Max and Batygin, Konstantin (2021) Architectures of Compact Super-Earth Systems Shaped by Instabilities. Bulletin of the American Astronomical Society, 53 (7). Art. No. 403.06. ISSN 0002-7537.

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Compact non-resonant super-Earth systems are a common outcome of planet formation and display dramatic signatures of intra-system uniformity, but the details of their formation and early evolution are poorly-known. During the protoplanetary disk phase, planets are expected to form outside of their current positions and migrate inwards, capturing into mean motion resonances. Dynamical instabilities can later destabilize these resonances. Here, we use a suite of n-body simulations to show that instabilities can not only reproduce the observed period ratio distribution, but that the resulting collisions also modify the mass uniformity in a way that is consistent with the observed sample. Furthermore, we demonstrate that primordial mass uniformity, motivated by the sample of resonant chains coupled with dynamical sculpting, naturally produces uniformity in period spacing similar to what is observed. Finally, we find that almost all collisions lead to perfect mergers, but some sort of post-instability damping and accretion are likely needed to completely reproduce the present-day dynamically cold architectures of sub-Jovian exoplanets.

Item Type:Article
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URLURL TypeDescription ItemJournal Article
Goldberg, Max0000-0003-3868-3663
Batygin, Konstantin0000-0002-7094-7908
Additional Information:License: Creative Commons Attribution 4.0 International License (CC-BY 4.0). Presentation #403.06 in the session “Exoplanets and Systems: Dynamics I”.
Issue or Number:7
Record Number:CaltechAUTHORS:20220518-223444857
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Official Citation:Goldberg, M., & Batygin, K. (2021). Architectures of Compact Super-Earth Systems Shaped by Instabilities. Bulletin of the AAS, 53(7). Retrieved from
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:114804
Deposited By: Tony Diaz
Deposited On:19 May 2022 15:38
Last Modified:19 May 2022 15:38

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