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Table 1.
Properties of the HD 24121 AB system.
| Property | Primary | Secondary |
|---|---|---|
| Age (Myr) (a) | 30–40 | … |
| Parallax (mas) (b) | 10.17 ± 0.01 | 9.67 ± 0.53 |
| μαcos(δ) (mas yr−1) (b) | 38.72 ± 0.01 | 38.13 ± 0.34 |
| μδ (mas yr−1) (b) | –2.64 ± 0.01 | –5.22 ± 0.48 |
| Sep (c) (mas, 2016.0) | – | 2071.2 ± 0.4 |
| PA (c) (deg, 2016.0) | – | 146.31 ± 0.01 |
| Sep (d) (mas, 2023-10-04) | – | 2082 ± 4 |
| PA (d) (deg, 2023-10-04) | – | 146.56 ± 0.15 |
| Sep (d) (mas, 2024-11-10) | – | 2082 ± 4 |
| PA (d) (deg, 2024-11-10) | – | 146.62 ± 0.15 |
| Gaia G (mag) | 9.628 ± 0.003 | 17.28 ± 0.01 |
| SPHERE ΔH2 (mag) (e) | – | 5.07 ± 0.05 |
| SPHERE ΔH3 (mag) (e) | – | 4.98 ± 0.05 |
| 2MASS J (mag) | 8.656 ± 0.024 | – |
| 2MASS H (mag) | 8.383 ± 0.046 | – |
| 2MASS K (mag) | 8.312 ± 0.024 | – |
| Teff (K) (e) | 5819 ± 13 | 2972 |
| log(L/L⊙) (dex) (e) | 0.012 ± 0.001 | –2.48 ± 0.06 |
| Mass | 1.06 M⊙(f) | 74.9 ± 7.5 MJ(e) |
Notes.
(a)
There is no conclusive age for XFOR, but the latest age estimate is about 30 Myr (Galli et al. 2021; Kerr et al. 2022). We adopted a conservative age range of 30–40 Myr.
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