Table 1
Stellar properties and parameters of the two planet-hosting stars.
| Parameter | GJ 724 | GJ 3988 | Reference |
|---|---|---|---|
| Name | BD−13 5069 | G 203−42 | Schönfeld (1886); Giclas et al. (1971) |
| Karmn | J18409−133 | J17033+514 | Caballero et al. (2016a) |
| Spectral type | M1.0 V | M4.5 V | Reid et al. (1995) |
| α (J2000) | 18:40:57.31 | 17:03:23.88 | Gaia Collaboration (2022) |
| δ (J2000) | −13:22:46.6 | +51:24:22.9 | Gaia Collaboration (2022) |
| G(a) (mag) | 9.7722 ± 0.0028 | 11.9810 ± 0.0028 | Gaia Collaboration (2021) |
| J(a) (mag) | 7.397 ± 0.018 | 8.768 ± 0.027 | Skrutskie et al. (2006) |
| π (mas) | 58.841 ± 0.030 | 100.927 ± 0.022 | Gaia Collaboration (2021) |
| d (pc) | 16.9949 ± 0.0086 | 9.9081 ± 0.0022 | Gaia Collaboration (2021) |
| μα cos δ (mas yr−1) | −94.287 ± 0.032 | + 124.410 ± 0.025 | Gaia Collaboration (2021) |
| μδ (mas yr−1) | −671.266 ± 0.027 | +610.145 ± 0.028 | Gaia Collaboration (2021) |
| γ (km s−1) | −33.36 ± 0.22 | +37.17 ± 0.30 | Gaia Collaboration (2021) |
| U (km s−1) | −14.5221 ± 0.0.0076 | −21.0460 ± 0.0068 | This work |
| V (km s−1) | −60.124 ± 0.023 | +38.956 ± 0.014 | This work |
| W (km s−1) | −15.754 ± 0.013 | 17.257 ± 0.011 | This work |
| Teff(b)(K) | 3799 ± 81 | 3273 ± 101 | Marfil et al. (2021) |
| log ɡ | 4.88 ± 0.08 | 4.92 ± 0.14 | Marfil et al. (2021) |
| [Fe/H] (dex) | −0.02 ± 0.05 | −0.12 ± 0.17 | Marfil et al. (2021) |
| L★ (L⊙) | 0.05118 ± 0.00034 | 0.004026 ± 0.000020 | This work |
| R★ (R⊙) | 0.52226 ± 0.02234 | 0.19734 ± 0.01219 | This work |
| M★ (M⊙) | 0.5271 ± 0.0263 | 0.1842 ± 0.0153 | This work |
| υ sin i (km s−1) | <2 | <2 | Reiners et al. (2018) |
| pEW(Hα) (Å) | +0.454 ± 0.010 | +0.071 ± 0.042 | Fuhrmeister et al. (2020) |
| < B > (G) | 310 ± 60 | <520 | Reiners et al. (2022) |
| log R′HK (dex) |  |
… | Perdelwitz et al. (2021) |
| < Prot > (d) | 57 ± 1/~28 | 116±3 | This work |
| Gal. population | Thin disc | Thin disc | This work |
Notes. (a)See Cifuentes et al. (2020) for a photometry compilation from Johnson B to WISE W4. (b)Teff uncertainty is the sum of the measurement error given in Marfil et al. (2021) and the weighted average of the widths of the differences to the literature values given in Table 5 of Marfil et al. (2021) serving as an estimate for the systematic error.
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