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Table A.1

Observing log of our Stokes VQU spectropolarimetric SPIRou observations of AU Mic in August 2023

BJD UT date Star c/ϕ texp S/N σP Stokes Bℓ <Bs> dT
(2459000+) (s) (H) (10−4 Ic) (G) (kG) (K)
1158.9450165 02 Aug 2023 AU Mic 238/0.466 802.4 834 0.81 V 5±4 2.51±0.05 19.19±1.18
1158.9557904 02 Aug 2023 AU Mic 238/0.468 802.4 845 0.63 Q
1158.9664817 02 Aug 2023 AU Mic 238/0.470 802.4 845 0.64 U
1159.8927438 03 Aug 2023 AU Mic 238 0.661 802.4 889 0.80 V 93±4 2.62±0.05 3.70±1.14
1159.9035273 03 Aug 2023 AU Mic 238 0.663 802.4 876 0.61 Q
1159.9143589 03 Aug 2023 AU Mic 238 0.666 802.4 895 0.61 U
1160.9676210 04 Aug 2023 AU Mic 238 0.882 802.4 920 0.74 V −13±4 2.54±0.04 16.45±1.31
1161.9622558 05 Aug 2023 AU Mic 239 0.087 802.4 893 0.95 V 76±5 2.81±0.03 -6.09±1.21
1165.8684823 09 Aug 2023 AU Mic 239 0.891 802.4 908 0.80 V −12±4 2.57±0.04 13.82±1.26
1165.8795421 09 Aug 2023 AU Mic 239 0.893 802.4 925 0.64 Q
1165.8903909 09 Aug 2023 AU Mic 239 0.895 802.4 923 0.61 U
1166.8725352 10 Aug 2023 AU Mic 240 0.097 802.4 882 0.77 V 62±4 2.80±0.03 -6.97±1.21
1166.8834741 10 Aug 2023 AU Mic 240 0.099 802.4 850 0.59 Q
1166.8938495 10 Aug 2023 AU Mic 240 0.102 802.4 772 0.65 U
1167.8481084 11 Aug 2023 AU Mic 240 0.298 802.4 904 0.84 V 11±4 2.79±0.04 1.06±1.25
1167.8590500 11 Aug 2023 AU Mic 240 0.300 802.4 907 0.63 Q
1167.8697311 11 Aug 2023 AU Mic 240 0.302 802.4 905 0.64 U
1179.8186449 23 Aug 2023 AU Mic 242 0.761 802.4 844 0.86 V 79±4 2.44±0.05 12.64±1.16
1179.8302123 23 Aug 2023 AU Mic 242 0.763 802.4 860 0.63 Q
1179.8420478 23 Aug 2023 AU Mic 242 0.766 802.4 880 0.66 U
1180.9308369 24 Aug 2023 AU Mic 242 0.990 802.4 867 0.92 V 17±4 2.61±0.04 5.83±1.13
1181.8186111 25 Aug 2023 AU Mic 243 0.173 802.4 866 0.84 V -16±4 2.88±0.03 -9.74±1.31
1181.8298154 25 Aug 2023 AU Mic 243 0.175 802.4 851 0.63 Q
1181.8406102 25 Aug 2023 AU Mic 243 0.177 802.4 837 0.65 U
1182.8234064 26 Aug 2023 AU Mic 243 0.379 802.4 830 0.94 V 27±5 2.50±0.05 15.01 ±1.31
1182.8342156 26 Aug 2023 AU Mic 243 0.382 802.4 832 0.66 Q
1182.8451345 26 Aug 2023 AU Mic 243 0.384 802.4 831 0.66 U
1184.8133935 28 Aug 2023 AU Mic 243 0.789 802.4 894 0.90 V 71±4 2.40±0.06
1185.7993039 29 Aug 2023 AU Mic 243 0.992 802.4 902 0.82 V 14±4 2.57±0.04 6.39±1.23
1185.8100395 29 Aug 2023 AU Mic 243 0.994 802.4 908 0.58 Q
1185.8207370 29 Aug 2023 AU Mic 243 0.996 802.4 891 0.73 U
1186.8327092 30 Aug 2023 AU Mic 244 0.204 802.4 740 0.91 V −20±4 2.83±0.03 -10.81±1.19
1186.8438843 30 Aug 2023 AU Mic 244 0.207 802.4 717 0.70 Q
1186.8546516 30 Aug 2023 AU Mic 244 0.209 802.4 709 0.71 U
1187.7936592 31 Aug 2023 AU Mic 244 0.402 802.4 670 0.95 V 16±5 18.52±1.16
1187.8247707 31 Aug 2023 AU Mic 244 0.408 802.4 691 0.71 Q
1187.8355074 31 Aug 2023 AU Mic 244 0.411 802.4 650 0.74 U
1188.7797490 01 Sep 2023 AU Mic 244 0.605 802.4 870 0.77 V 92±4 2.54±0.04 11.29±1.07
1188.7903324 01 Sep 2023 AU Mic 244 0.607 802.4 882 0.64 Q
1188.8013085 01 Sep 2023 AU Mic 244 0.609 802.4 896 0.61 U

Notes. All exposures consist of 4 sub-exposures of equal length. For each star and each visit, we list the barycentric Julian date BJD, the UT date, the rotation cycle c and phase ϕ (computed as indicated in Sect. 3), the total observing time texp, the peak S/N in the spectrum (in the H band) per 2.3 km s−1 pixel, the noise level in the LSD Stokes profile, the estimated Bℓ with error bars (for Stokes V profiles only), the measured small-scale field <Bs> and differential temperature dT with error bars (for each observing night).

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