A High Spatial Resolution Infrared View of the T Tauri Multiple System
Bibliographic record
Abstract
We present the results of our monitoring study of the IR photometric and spectroscopic variability of the T Tau multiple system. We also present data on the apparent position of T Tau South (T Tau S) with respect to T Tau North (T Tau N), and two new spatially resolved observations of the T Tau Sa-Sb binary. T Tau N has not varied by more than 0.2 mag in K and L ' flux during the 8 years of our observations, although its Brγ and Brα emission-line fluxes have varied by nearly a factor of 4 during this time. For the unresolved T Tau S system, we have derived a 20 yr light curve based on our images and on measurements available in the literature. T Tau S varies by 2-3 mag in K - and L '-band brightness in a "redder when faint" manner, consistent with changes along the line of sight in the amount of material that follows an interstellar medium extinction law. Absorption in the 3.05 μm water ice feature is seen only in the spectra of T Tau S, and it displays variations in depth and profile. H 2 (2.12 μm) emission is also detected only at the position of T Tau S; the H 2 , Brγ, and Brα emission-line fluxes also vary. We have found that the apparent positions of T Tau S with respect to T Tau N and T Tau Sb with respect to Sa are consistent with gravitationally bound orbital motion. The possible orbits of the T Tau S binary imply that Sa is likely the most massive component in this young triple. A reanalysis of the motion of the radio source associated with T Tau S provides no evidence for an ejection event in the T Tau system.
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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 | 0.001 |
| 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) | 0.004 | 0.001 |
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".