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Table A.1

Reported stellar parameters.

Parameter GJ 1132 GJ 1252 LTT 3780 GJ 357 HD 260655 L 98-59 LHS 1140 TOI-270
TOI 667 1078 732 562 4599 175 256 270
Mass (M) 0.198 ± 0.005 0.381 ± 0.008 0.363 ± 0.008 0.346 ± 0.007 0.463 ± 0.010 0.293 ± 0.006 0.184 ± 0.004 0.362 ± 0.008
Radius (R) 0.226 ± 0.007 0.391 ± 0.012 0.375 ± 0.011 0.360 ± 0.011 0.465 ± 0.014 0.314 ± 0.009 0.215 ± 0.007 0.374 ± 0.011
Teff (K) 322962+78Mathematical equation: $\[3229_{-62}^{+78}\]$3 3458 ± 1374 3358 ± 925 3505 ± 516 3803 ± 507 3415 ± 1358 3096 ± 489 3506 ± 7010
Sp. T M4.5V M3V M 3.5V M 2.5V M0V M3V M 4.5V M3V
log g 5.02 ± 0.03 4.83 ± 0.03 4.85 ± 0.03 4.86 ± 0.03 4.77 ± 0.03 4.91 ± 0.03 5.04 ± 0.03 4.85 ± 0.03
vmic (km/s) [0,2] [0, 1] [0, 1] [0, 1] [0, 1.5] [0, 1.5] [0, 1] [0, 1]
vmac (km/s) [5.5, 7.5] 5.65 ± 1.98 5.54 ± 2.54 5.48 ± 1.86 4.33 ± 1.10 5.43 ± 2.36 [6, 8] 5.33 ± 1.73
[Fe/H] −0.18 ± 0.15 −0.18 ± 0.13 0.06 ± 0.14 −0.12 ± 0.12 −0.48 ± 0.06 −0.29 ± 0.15 −0.25 ± 0.11 −0.14 ± 0.12
[Mg/H] _1 −0.04 ± 0.24 0.07 ± 0.16 −0.27 ± 0.12 −0.32 ± 0.09 −0.34 ± 0.21 _1 −0.31 ± 0.13
[Si/H] _1 −0.00 ± 0.39 0.20 ± 0.23 −0.26 ± 0.16 −0.57 ± 0.11 −0.27 ± 0.28 _1 −0.20 ± 0.19
[Ti/H] −0.19 ± 0.17 −0.30 ± 0.12
[M/H] −0.17 ± 0.10 0.020.16+0.19Mathematical equation: $\[-0.02_{-0.16}^{+0.19}\]$ 0.140.11+0.12Mathematical equation: $\[0.14_{-0.11}^{+0.12}\]$ −0.20 ± 0.08 −0.43 ± 0.06 0.270.13+0.14Mathematical equation: $\[-0.27_{-0.13}^{+0.14}\]$ −0.28 ± 0.07 −0.20 ± 0.09
Fe/Mg 0.810.33+0.56Mathematical equation: $\[0.81_{-0.33}^{+0.56}\]$2 0.570.27+0.51Mathematical equation: $\[0.57_{-0.27}^{+0.51}\]$ 0.770.30+0.50Mathematical equation: $\[0.77_{-0.30}^{+0.50}\]$ 1.120.37+0.56Mathematical equation: $\[1.12_{-0.37}^{+0.56}\]$ 0.550.14+0.19Mathematical equation: $\[0.55_{-0.14}^{+0.19}\]$ 0.890.40+0.72Mathematical equation: $\[0.89_{-0.40}^{+0.72}\]$ 0.900.29+0.44Mathematical equation: $\[0.90_{-0.29}^{+0.44}\]$2 1.170.40+0.62Mathematical equation: $\[1.17_{-0.40}^{+0.62}\]$
Mg/Si 1.160.76+2.15Mathematical equation: $\[1.16_{-0.76}^{+2.15}\]$ 0.920.44+0.84Mathematical equation: $\[0.92_{-0.44}^{+0.84}\]$ 1.220.46+0.74Mathematical equation: $\[1.22_{-0.46}^{+0.74}\]$ 2.190.66+0.94Mathematical equation: $\[2.19_{-0.66}^{+0.94}\]$ 1.070.59+1.33Mathematical equation: $\[1.07_{-0.59}^{+1.33}\]$ 0.940.40+0.69Mathematical equation: $\[0.94_{-0.40}^{+0.69}\]$
[α/Fe] 0.00 ± 0.19 0.200.26+0.27Mathematical equation: $\[0.20_{-0.26}^{+0.27}\]$ 0.10 ± 0.20 −0.14 ± 0.16 0.07 ± 0.10 0.01 ± 0.23 −0.05 ± 0.14 0.100.16+0.17Mathematical equation: $\[-0.10_{-0.16}^{+0.17}\]$

This table details the stellar parameters and abundances we derived. The stellar masses and radii are derived from relations in Mann et al. (2015) and Mann et al. (2019), using K-band magnitudes from 2MASS and parallaxes from Gaia DR3. Surface gravities are derived from calculated masses and radii. The [M/H] values reported here are the final values derived from stellar abundances in this paper; the initial [M/H] values used in the stellar abundance calculations described in Section 3.2 are given in Section 3.1. As we did not calculate effective temperature, however, the values reported in Section 3.1 are repeated here. For reference, solar values of Fe/Mg and Mg/Si are 0.800.10+0.11Mathematical equation: $\[0.80_{-0.10}^{+0.11}\]$ and 1.230.13+0.15Mathematical equation: $\[1.23_{-0.13}^{+0.15}\]$ respectively (Asplund et al. 2009). All of the microturbulences and some of the macroturbulences calculated have unreasonably wide uncertainties or physically implausible parameter ranges when fit as described in Section 3.2; we therefore estimated these parameter ranges by eye and report them instead.

1 The [Mg/H] and [Si/H] abundances for GJ 1132 and LHS 1140 are not considered reliable, due to the low number of spectral lines used and their poor quality. See Section 3.2 for more details; the unreliable abundances are reported in Table C.1 for completeness.

2 The Fe/Mg values calculated for GJ 1132 and LHS 1140 are calculated by assuming [Mg/H] is equal to the calculated [Ti/H] value; see Section 3.2 for more details.

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