Table 1
Sample of dM stars.
Star | Year | Sp. | M ∗ | R ∗ | P rot | Ro |
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T eff | log [L⋆/L⊙] | [lin,lout] |
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α0 (°) |
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|
ID | obs. | type | (M⊙) | (R⊙) | (d) | (0.01) | (G) | (K) | (au) | [Bp,0 = 1G] | [Bp,0 = 1G] | (au) | [present] | [young] | ||
|
||||||||||||||||
GJ 182 | 2007 | M0.5 | 0.75 | 0.82 | 4.35 | 17.4 | 172 | 3950 | − 0.88 | [0.27,0.73] | [4.0,7.7] | [30,21] | 1.3 | [3.6,25] | [0.28,2.0] | |
DT Vir | 2008 | M0.5 | 0.59 | 0.53 | 2.85 | 9.2 | 149 | 3790 | − 1.26 | [0.18,0.47] | [5.5,11] | [25,18] | 0.48 | [1.3,9.6] | [0.11,0.75] | |
DS Leo | 2008 | M0 | 0.58 | 0.52 | 14.00 | 43.8 | 87 | 3770 | − 1.29 | [0.17,0.46] | [5.9,11] | [24,17] | 0.44 | [1.1,7.9] | [0.086,0.62] | |
GJ 49 | 2007 | M1.5 | 0.57 | 0.51 | 18.60 | 56.4 | 27 | 3750 | − 1.31 | [0.17,0.45] | [6.1,12] | [24,17] | 0.42 | [1.00,7.2] | [0.078,0.56] | |
OT Ser | 2008 | M1.5 | 0.55 | 0.49 | 3.40 | 9.7 | 123 | 3690 | − 1.38 | [0.15,0.41] | [3.7,7.1] | [31,22] | 0.81 | [4.4,32] | [0.35,2.5] | |
CE Boo | 2008 | M2.5 | 0.48 | 0.43 | 14.70 | 35.0 | 103 | 3570 | − 1.56 | [0.13,0.34] | [3.0,5.8] | [35,24] | 0.90 | [8.1,59] | [0.63,4.6] | |
AD Leo | 2008 | M3 | 0.42 | 0.38 | 2.24 | 4.7 | 180 | 3540 | − 1.67 | [0.11,0.30] | [2.5,4.9] | [39,27] | 1.0 | [13,97] | [1.0,7.6] | |
EQ Peg A | 2006 | M3.5 | 0.39 | 0.35 | 1.06 | 2.0 | 480 | 3530 | − 1.73 | [0.10,0.28] | [2.2,4.2] | [43,29] | 1.2 | [21,160] | [1.7,12] | |
EV Lac | 2007 | M3.5 | 0.32 | 0.30 | 4.37 | 6.8 | 490 | 3480 | − 1.88 | [0.087,0.24] | [1.9,3.8] | [46,31] | 1.2 | [30,220] | [2.4,17] | |
V374 Peg | 2006 | M4 | 0.28 | 0.28 | 0.45 | 0.6 | 640 | 3410 | − 2.02 | [0.074,0.20] | [1.7,3.3] | [50,34] | 1.3 | [45,340] | [3.5,26] | |
EQ Peg B | 2006 | M4.5 | 0.25 | 0.25 | 0.40 | 0.5 | 450 | 3340 | − 2.14 | [0.065,0.18] | [1.8,3.4] | [49,33] | 1.0 | [39,290] | [3.1,23] | |
GJ 1156 | 2009 | M5 | 0.14 | 0.16 | 0.49 | 0.5 | 100 | 3160 | − 2.60 | [0.038,0.11] | [3.3,6.5] | [33,23] | 0.23 | [5.9,45] | [0.46,3.5] | |
GJ 1245 B | 2008 | M5.5 | 0.12 | 0.14 | 0.71 | 0.7 | 60 | 3030 | − 2.79 | [0.031,0.085] | [3.5,7.0] | [32,22] | 0.17 | [4.8,37] | [0.37,2.9] | |
WX UMa | 2009 | M6 | 0.10 | 0.12 | 0.78 | 0.8 | 1060 | 2770 | − 3.10 | [0.022,0.061] | [1.0,1.7] | [90,50] | 1.0 | [330,2600] | [25,200] | |
DX Cnc | 2009 | M6 | 0.10 | 0.11 | 0.46 | 0.5 | 80 | 2700 | − 3.19 | [0.019,0.055] | [2.8,5.5] | [37,25] | 0.16 | [9.4,75] | [0.73,5.9] |
Notes. The columns are: the star name, the observation year, the
stellar spectral type, mass M∗, radius
R∗, rotation period
Prot, Rossby number Ro, the average surface
magnetic-field strength derived from the ZDI technique
, effective
temperature Teff, stellar bolometric luminosity
L⋆, inner
lin and outer lout edges
of the insulation HZ, the upper limit of magnetospheric sizes
rM (Eq. (4)) of planets with similar Earth’s magnetisation orbiting in the HZ and
the corresponding aperture of their auroral ovals α0.
is
the closest orbital distance required for a terrestrial planet to sustain a
present-day-Earth-sized magnetosphere (Eq. (9)).
and
are the range of the lowest planetary magnetic field (Eq. (10)) required for a terrestrial planet
orbiting inside the HZ to sustain the present-day
(11.7 rp) and young Earth’s
(5 rp) magnetospheric size, respectively.
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