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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 RHK (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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