Table A.1
Model parameter
| Parameter | LHS 1140 | Sun | Comment |
|---|---|---|---|
| type | M4.5 | G2V | (a) |
| Teff | 3220 K | 5772 K | (b) |
| Prot | 131 d | 25 d (equator) | (b) |
| L★/ L⊙ | 4.4 ⋅ 10–3 | 1 | (c) |
| R★/ R⊙ | 0.212 | 1 | (b) |
| M★/ M⊙ | 0.179 | 1 | (b) |
| B★ | 1G | 1 kG | (d,i) |
| Ṁ★ | 5 ⋅ 10–17 M⊙ yr–1 | 2 ⋅ 10–14M⊙ yr–1 | (e) |
| d★ | 14.98 pc | 1 au | |
| age | 7.84 Gyr | 4.6 Gyr | (f) |
| Tsw | 46 ⋅ 103 K | 70 ⋅ 103 K | (g) |
| usw | 250 km s–1 | 400 km s–1 | (e) |
| nsw | 0.04 cm–3 | 4 cm–3 | (e) |
| Bsw | 0.33 nT | 4 nT | (g) |
| Tism,p | 12000 K | 6370 K | (g) |
| uism,p | 48 km s–1 | 26 km s–1 | (g) |
| nism,p | 0.06 cm–3 | 0.06 cm–3 | (g) |
| Bism | 0.3 nT | 0.3 nT | (g) |
| φB,ism | 150° | 150° | (g) |
| ϑB,ism | 30° | 30° | (g) |
| Tism,H | 12000 K | 6370 K | f(g) |
| uism,H | 48 km s–1 | 26 km s–1 | (g) |
| nism,H | 0.1 cm–3 | 0.1 cm–3 | (g) |
Notes. Stellar properties of LHS 1140 (first block), the corresponding stellar wind properties at 1 au (second block), and the assumed ISM parameters (third block). Solar values are listed for comparison. The direction of the inflow vector is always along the x-axis. Comments: (a) = Data taken from the Simbad data base, (b) = taken from Benedict et al. (1998), (c) = data calculated via the Stefan-Boltzmann law L★ ∝ R★ T★, (d) = sophisticated guess, see text, (e) = after Modi et al. (2023), (f) = after Engle & Guinan (2023) (g) = sophisticated estimation based on heliospheric parameters. (i) the solar magnetic field strength seen from 1 pc (private communication with P.J. Steyn).
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