Table 3
Stellar parameters of the stars presented in this paper.
| TOI-3288 | TOI-4666 | ||||
|---|---|---|---|---|---|
| Parameter | TIC 79920467 | TIC 165202476 | Source | Sect. | |
| SpType | K9V | M 2.5V | Teff NIRPS | 4 | |
| B | (mag) | 16.5 ± 0.1 | 16.75 ± 0.08 | TESS | |
| V | (mag) | 15.0 ± 0.2 | 15.3 ± 0.2 | TESS | |
| G | (mag) | 14.2 | 14.4 | Gaia DR3 | |
| J | (mag) | 12.04 ± 0.03 | 11.98 ± 0.02 | 2MASS | |
| H | (mag) | 11.42 ± 0.03 | 11.29 ± 0.02 | 2MASS | |
| K | (mag) | 11.20 ± 0.03 | 11.09 ± 0.03 | 2MASS | |
| π | (mas) | 4.97 ± 0.02 | 6.49 ± 0.02 | Gaia DR3 | |
| d | (pc) | 201.3 ± 1.0 | 154.1 ± 0.4 | π | 4 |
| log(g) | (cm s−2) | ![Mathematical equation: $\[4.658_{-0.004}^{+0.003}\]$](/articles/aa/full_html/2026/03/aa57656-25/aa57656-25-eq1.png) |
![Mathematical equation: $\[4.626_{-0.004}^{+0.008}\]$](/articles/aa/full_html/2026/03/aa57656-25/aa57656-25-eq2.png) |
Gaia DR3 | |
| Teff | (K) | 3933 ± 48 | 3512 ± 36 | NIRPS | 4.1.1 |
| Teff | (K) | 3881 ± 111 | 3720 ± 103 | HARPS | 4.1.2 |
| [M/H](a) | (dex) | −0.1 ± 0.1 | −0.1 ± 0.1 | NIRPS | 4.1.1 |
| [Fe/H] | (dex) | 0.27 ± 0.13 | 0.19 ± 0.12 | HARPS | 4.1.2 |
| [Mg I/H] | (dex) | 0.10 ± 0.09 | NIRPS | 4.1.1 | |
| [Si I/H] | (dex) | 0.16 ± 0.14 | NIRPS | 4.1.1 | |
| [Ca I/H] | (dex) | 0.03 ± 0.21 | 0.3 ± 0.5 | NIRPS | 4.1.1 |
| AV | (mag) | 0.10 ± 0.09 | 0.02 ± 0.02 | SED | 4.2 |
| Lbol | (L⊙) | 0.110 ± 0.003 | 0.060 ± 0.003 | SED | 4.2 |
| R⋆ | (R⊙) | 0.67 ± 0.02 | 0.59 ± 0.02 | Mann et al. (2015) | |
| M⋆ | (M⊙) | 0.64 ± 0.01 | 0.58 ± 0.01 | Mann et al. (2019) | |
| Prot | (d) | ~13.7(b) | ~15.5 | TESS | 4.3 |
| Prot | (d) | 16.3 | 15.3 | ASAS | 4.3 |
Notes. (a)The [M/H] values reported here are derived from spectral metallicity and should be considered lower bounds for the star’s overall metallicity. They reflect primarily the OH abundance and should not be directly compared to integrated [M/H] measurements from other sources. (b) Ambiguous variation.
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