The VELOCE Project: First Data Release, Key Findings, and Future Directions
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2026
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| author | Viviani, Giordano |
| author_facet | Viviani, Giordano |
| contents | <p>The VELOcities of CEpheids (VELOCE) project is a comprehensive spectroscopic survey of Galactic classical Cepheids, designed to achieve high-precision radial velocity (RV) measurements, long temporal baselines, and dense sampling. Its first data release (DR1; mid-2024) provides 18 225 RV measurements of 258 bona fide Cepheids and 1 161 observations of 164 additional variables, collected from both hemispheres since 2010. Individual uncertainties of 2-50 m/s and multi-year coverage enable high-fidelity pulsation curves and robust comparisons with the literature.</p> <p>DR1 offers an unprecedented view of Cepheid line-of-sight variations: the most detailed description to date of the Hertzsprung progression in RVs; the first identification of double-peaked bumps in pulsation curves; and clear evidence that virtually all Cepheids exhibit spectroscopic variability leading to RV modulations at the level of 20-40 m/s. Modulated variability is detected in 36 stars, and further inspection of these targets has revealed the first spectroscopic detections of non-radial pulsation modes. DR1 also includes measurements of linear period-change rates for 146 Cepheids and the identification of 76 single-lined spectroscopic binaries (29 % of the sample), from which we derive 30 precise and 3 tentative orbital solutions-18 of them reported for the first time. The behaviour of ΔR/p as a function of period suggests star-to-star variations in the p-factor that may explain difficulties in determining a clear relation between p and log(P).</p> <p>Ongoing work focuses on modulated variability and the development of RV templates. The latter are designed to streamline future analyses - even with sparse or noisy data - and to enable consistent comparisons across large surveys such as Gaia, 4MOST, and SDSS, as well as future missions like WST. These templates will be particularly valuable for kinematic studies of the Magellanic Clouds and constraining the Milky Way's rotation curve.</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_18130070 |
| institution | Zenodo |
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| publishDate | 2026 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | The VELOCE Project: First Data Release, Key Findings, and Future Directions Viviani, Giordano <p>The VELOcities of CEpheids (VELOCE) project is a comprehensive spectroscopic survey of Galactic classical Cepheids, designed to achieve high-precision radial velocity (RV) measurements, long temporal baselines, and dense sampling. Its first data release (DR1; mid-2024) provides 18 225 RV measurements of 258 bona fide Cepheids and 1 161 observations of 164 additional variables, collected from both hemispheres since 2010. Individual uncertainties of 2-50 m/s and multi-year coverage enable high-fidelity pulsation curves and robust comparisons with the literature.</p> <p>DR1 offers an unprecedented view of Cepheid line-of-sight variations: the most detailed description to date of the Hertzsprung progression in RVs; the first identification of double-peaked bumps in pulsation curves; and clear evidence that virtually all Cepheids exhibit spectroscopic variability leading to RV modulations at the level of 20-40 m/s. Modulated variability is detected in 36 stars, and further inspection of these targets has revealed the first spectroscopic detections of non-radial pulsation modes. DR1 also includes measurements of linear period-change rates for 146 Cepheids and the identification of 76 single-lined spectroscopic binaries (29 % of the sample), from which we derive 30 precise and 3 tentative orbital solutions-18 of them reported for the first time. The behaviour of ΔR/p as a function of period suggests star-to-star variations in the p-factor that may explain difficulties in determining a clear relation between p and log(P).</p> <p>Ongoing work focuses on modulated variability and the development of RV templates. The latter are designed to streamline future analyses - even with sparse or noisy data - and to enable consistent comparisons across large surveys such as Gaia, 4MOST, and SDSS, as well as future missions like WST. These templates will be particularly valuable for kinematic studies of the Magellanic Clouds and constraining the Milky Way's rotation curve.</p> |
| title | The VELOCE Project: First Data Release, Key Findings, and Future Directions |
| url | https://doi.org/10.5281/zenodo.18130070 |