Discovery of Two New Pulsating DA (ZZ Ceti) White Dwarfs
Bibliographic record
Abstract
We report the detection of multiperiodic luminosity variations in the light curves of the two DA white dwarfs GD 244 and KUV 02464+3239. We selected these objects as candidate ZZ Ceti stars on the basis of our analysis of their optical spectra, which revealed that their atmospheric parameters place them inside the empirical instability strip in the log g - T eff plane. We find that GD 244 is an intermediate-amplitude pulsator with at least four excited modes with periods in the range 203-307 s, which is consistent with its position in the middle of the ZZ Ceti instability strip at T eff = 11,680 K and log g = 8.08. We compare the properties of GD 244 with those of GD 66, a previously known ZZ Ceti star that appears to be a photometric clone of the former. We also find that KUV 02464+3239 is a large-amplitude, long-period variable, which is again consistent with its position at T eff = 11,290 K and log g = 8.08 in the log g - T eff diagram, near the red edge of the empirical instability strip. The light curve of KUV 02464+3239 is dominated by a quasi-period of ~ 832 s and resembles that of its photometric twin GD 154. Our findings bring to 31 the number of known gravity-mode ZZ Ceti pulsators.
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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 | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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".