Regolith dynamics on small bodies in the Solar System
Bibliographic record
Abstract
Many small bodies in the Solar System, such as near-Earth asteroids, are believed to be granular aggregates - rubble piles – held together mainly by low self-gravity, typically of the order of mms −2 . Over their lifetime, the evolution of the spin state and shape of such bodies, as well as their bulk and surface differentiation, is affected by numerous geophysical processes that includes radiation, tides, impact cratering, surface activity, thermal cycling, degassing and electromagnetic forces. An ultimate goal is the development of a model that incorporates these processes and is able to follow the body’s development over its lifetime. Here, as a first step, we present a stochastic continuum model to investigate regolith dynamics on small rubble bodies, and its role in the rotational dynamics and reshaping of these bodies. We account for radiation torque and impactinduced landsliding, and couple the body’s rotation to its shape variations. We apply our model to investigate the shape and spin changes of a rubble asteroid over millions of years. An important finding is that the asteroid’s long-term dynamics appears to be controlled by global landsliding events, which has generally been ignored.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".