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David Nesvorny's and my new review is out: "Origin and dynamical evolution of the asteroid belt". It will be published in a book on Ceres and Vesta.
Let me go through a few interesting things
1/
https://arxiv.org/abs/2012.07932
Let me go through a few interesting things
1/
https://arxiv.org/abs/2012.07932
The asteroids together all add up to less than 1/1000th of an Earth mass.
It's weird to have so much unused orbital real estate in the middle of a system. It's like a vacant skyscraper in the middle of NYC
The question is why?
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(image from https://planetpailly.com/2015/07/28/how-crowded-is-the-asteroid-belt/)
It's weird to have so much unused orbital real estate in the middle of a system. It's like a vacant skyscraper in the middle of NYC
The question is why?
2/
(image from https://planetpailly.com/2015/07/28/how-crowded-is-the-asteroid-belt/)
Standard view (from Wetherill): the belt was born with many Earth masses in planetesimals and strongly depleted.
Contrarian view: few planetesimals ever formed in the belt. The belt's story is one of implantation rather than depletion
3/ https://planetplanet.net/2017/09/13/the-empty-primordial-asteroid-belt/
Contrarian view: few planetesimals ever formed in the belt. The belt's story is one of implantation rather than depletion
3/ https://planetplanet.net/2017/09/13/the-empty-primordial-asteroid-belt/
The asteroids' orbits are excited, with significant eccentricities and inclinations. There are a lot of ideas for how this might have happened:
- scattering by embryos (old view)
- scattering by Jupiter
- chaotic excitation by J/S
- excitation during instability
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- scattering by embryos (old view)
- scattering by Jupiter
- chaotic excitation by J/S
- excitation during instability
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Since the asteroid belt lies between the terrestrial and giant planets, it was sculpted by both.
The belt is sort of like the apartment in between Bob Dylan's childhood home and Stephen Hawking's. What can we learn about what shaped them?
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The belt is sort of like the apartment in between Bob Dylan's childhood home and Stephen Hawking's. What can we learn about what shaped them?
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The asteroid belt directly constrains global models like the Grand Tack, Early Instability and Low-mass Asteroid belt models.
No model these days can be deemed viable if it doesn't match the belt in broad strokes
Lots of details in this review: https://ui.adsabs.harvard.edu/abs/2018arXiv181201033R/abstract
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No model these days can be deemed viable if it doesn't match the belt in broad strokes
Lots of details in this review: https://ui.adsabs.harvard.edu/abs/2018arXiv181201033R/abstract
7/
One newish interesting result: the deficit of inner main belt, high-inclination asteroids can be linked with the last phase of Saturn's migration
From Clement et al (2020): https://ui.adsabs.harvard.edu/abs/2020MNRAS.492L..56C/abstract
8/
From Clement et al (2020): https://ui.adsabs.harvard.edu/abs/2020MNRAS.492L..56C/abstract
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Ceres and Vesta -- targets of the @NASA_Dawn mission -- may both have been born elsewhere.
Ceres from beyond Jupiter (animation from Raymond & Izidoro 2017).
And Vesta from the terrestrial planet-forming region (first proposed by Bottke et al 2006)
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Ceres from beyond Jupiter (animation from Raymond & Izidoro 2017).
And Vesta from the terrestrial planet-forming region (first proposed by Bottke et al 2006)
9/
To wrap up, here is the Asteroid review again.
It was great to write this with David Nesvorny, asteroid (and overall dynamics) ninja!
/end
https://arxiv.org/abs/2012.07932
It was great to write this with David Nesvorny, asteroid (and overall dynamics) ninja!
/end
https://arxiv.org/abs/2012.07932
