Gravitational Instability in a Planet-Forming Disk
Bibliographic record
Abstract
If a protoplanetary disk is sufficiently massive, its own self-gravity becomes absolutely consequential to its evolution and readiness for planet formation. Such a disk is said to be undergoing gravitational instability (GI), a fundamental process that results in prominent spiral arms forming throughout the disk on global scales, which can fragment into clump-like protoplanets. Despite its importance to disk evolution and planet formation, diagnosing whether gravitational instability is at play in real disks has historically proven difficult. In this poster, I present new ALMA Band 6 molecular line observations of the AB Aur disk taken in 2022, one of the longest ALMA gas programs toward a single protoplanetary disk to date. AB Aur is a bright and well-studied young system that hosts multiple candidate sites of protoplanet formation identified in previous observations. I describe our discovery of clear and direct evidence of GI in the AB Aur disk, using newly developed kinematic techniques.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".