The origin, excitation, and evolution of subarcsecond outflows near T Tauri
Bibliographic record
Abstract
Aims. We study the complex H2 outflows in the inner 300 AU of the young triple star system T Tauri, with the goal of understanding the origin, excitation and evolution of the circumstellar matter.Methods. Using high spatial resolution, integral-field spectroscopy in the J and K photometric bands from SINFONI/VLT, we trace the spatial distribution of 12 H2 ro-vibrational emission lines, as well as one forbidden Fe II line. The ratio of line strengths provides a two-dimensional view of both the variable extinction and excitation temperature in this region, while the line-center velocities, coupled with previously published imagery, allow an assessment of the 3D space velocities and evolution of the outflows.Results. Several spatially distinct flows – some with a bow shock structure – appear within 15 of the stars. Data taken two years apart clearly show the evolution of these flows. Some structures move and evolve, while others are stationary in the plane of the sky. The two-dimensional extinction map shows that the extinction between T Tau N and T Tau S is very high. In addition to being clumpy the extincting material forms part of a filament that extends to the east of the stars. In areas with strong line emission, the v = 1–0 S(1)/v = 2–1 S(1) line ratio ranges from 8 to 20, indicating that all of the observed H2 is shock excited. The outflows in the immediate vicinity of T Tau S span ~270° and are all blue-shifted, suggesting that they are produced by more than one star. We propose that T Tau N drives the east-west outflow, while T Tau Sa and T Tau Sb are the sources of the southeast-northwest and a previously undetected southwest outflow, respectively. There is a large spatial overlap between the [Fe II] line emission and previously measured UV fluorescent H2 emission, showing that both may be produced in J-shocks.
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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 | 0.001 | 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".