VROOMM: a new high-resolution echelle spectrograph for Observatoire du Mont Mégantic
Bibliographic record
Abstract
VROOMM is an optical (360nm - 930 nm) high-resolution échelle spectrograph currently in its design phase for the 1.6-meter telescope of the Observatoire du Mont-Mégantic (OMM) in Québec, Canada. Specifically designed for precision radial velocity (RV) measurements of relatively faint stars, the instrument features a 4K photon-counting EMCCD, octagonal fibers, and a double scrambler, all housed in a thermally stabilized vacuum cryostat. Designed for a resolution exceeding 80 000, the spectrograph aims to provide RV measurements with precision tailored for specific cases. The first scenario involves using the EMCCD like a normal CCD without electron amplification, enabling follow-up observations of terrestrial planets, super-Earths, and mini-Neptunes orbiting relatively bright M dwarfs. The second case employs photon counting, utilizing the electron-multiplying mode of the EMCCD to achieve 100−200 m/s velocimetry through cross-correlation of extremely low signal-to-noise ratio data. This innovative approach opens up observations of stars as faint as <i>r</i><sup>sdss</sup>=19-20, an unexplored realm in RV studies. The main science niche for this mode is the confirmation of brown dwarfs orbiting cool stars and stellar dynamics within open clusters and young associations. Typically observed at low resolution, these targets face challenges in achieving RV precision better than a few km/s. VROOMM’s photon counting capability presents a novel solution for obtaining high-precision radial velocities in this challenging regime. We detail the unique features and capabilities of each operation mode, emphasizing the novel contributions of VROOMM in advancing precision RV measurements for a diverse range of exoplanet systems.
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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".