Where is the Water? Jupiter-like C/H ratio but strong H2O depletion found on tau Boo b using SPIRou
Bibliographic record
Abstract
In this comic-book-style talk, I will take you along the adventures of protagonists Spirou and Fantasio as they explore the enigmatic tau Boötis exoplanetary system. Their quest? To study the atmosphere of this keystone hot Jupiter and relate its inferred envelope composition back to our understanding of how giant planets form. In this presentation we will follow our heroes as they use the new high-resolution near-infrared SPIRou spectrograph to observe the dayside of the non-transiting hot Jupiter tau Boo b. With its simultaneous 0.95-2.50um wavelength coverage and R = 70000 spectral resolution, SPIRou delivers an unprecedented sensitivity to both H2O and CO, the primary carbon- and oxygen-bearing molecules expected in hot Jupiter atmospheres. Join me today to find out how Spirou and Fantasio combine a total of 20 hours of SPIRou data obtained over five nights to not only recover a precise CO abundance corresponding to a C/H ratio consistent with the value of Jupiter, but also to retrieve the exact temperature structure of tau Boo b, and infer an extremely depleted water abundance of less than 100 times the expected value for a solar composition. Finally, our adventurers will link these unexpected results to the larger population of giant planets, and how these may form in the protoplanetary disk.
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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 | 0.001 | 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".