Evidence for synchronisation of Gaia eclipsing binaries from their stellar rotational velocity
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866908481951367168 |
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| author | Hadad, E. Mazeh, T. Faigler, S. |
| author_facet | Hadad, E. Mazeh, T. Faigler, S. |
| contents | The Gaia DR3 catalogue includes line-broadening (vbroad) measurements for 10,387 eclipsing binaries. In this study, we focus on a subset of 977 short-period main-sequence systems with primary radii between 1.25 and 3 solar radii, effective temperatures from 5600 to 8000 K, orbital periods between 0.3 and 3 days, vbroad values from 30 to 300 km/s, eclipse depth ratios below 0.7, and eccentricity indicators |e cos(omega)| less than 0.1. We find a clear inverse correlation between vbroad and orbital period, consistent with tidal synchronisation and spin-orbit alignment. Comparing the Gaia vbroad values with the expected rotational velocities based on stellar radii, we find that the measurements are generally consistent with rotational broadening, albeit with a systematic offset of approximately 10 percent. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2508_05774 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Evidence for synchronisation of Gaia eclipsing binaries from their stellar rotational velocity Hadad, E. Mazeh, T. Faigler, S. Solar and Stellar Astrophysics The Gaia DR3 catalogue includes line-broadening (vbroad) measurements for 10,387 eclipsing binaries. In this study, we focus on a subset of 977 short-period main-sequence systems with primary radii between 1.25 and 3 solar radii, effective temperatures from 5600 to 8000 K, orbital periods between 0.3 and 3 days, vbroad values from 30 to 300 km/s, eclipse depth ratios below 0.7, and eccentricity indicators |e cos(omega)| less than 0.1. We find a clear inverse correlation between vbroad and orbital period, consistent with tidal synchronisation and spin-orbit alignment. Comparing the Gaia vbroad values with the expected rotational velocities based on stellar radii, we find that the measurements are generally consistent with rotational broadening, albeit with a systematic offset of approximately 10 percent. |
| title | Evidence for synchronisation of Gaia eclipsing binaries from their stellar rotational velocity |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2508.05774 |