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Table 1

Observing log of the Narval observations.

ID HJD [d] texp [s] φ rot All He only He excluded
−2 450 000 S/N Detect. S/N Detect. S/N Detect.
1 6185.66197234 4 × 1000 s 0.803874 2067 DD 297 ND 1597 ND
2 6203.61791407 4 × 1000 s 0.806639 2075 DD 291 MD 1666 MD
3 6206.64674915 4 × 1000 s 0.180735 2111 DD 288 DD 1662 MD
4 6214.58370424 4 × 1000 s 0.022434 2032 ND 290 ND 1647 ND
5 6230.56793210 4 × 800 s 0.828727 2083 DD 288 DD 1650 MD
6 6230.60771309 4 × 800 s 0.873043 2052 DD 284 MD 1657 MD
7 6230.64747616 4 × 800 s 0.917338 2032 DD 280 MD 1654 MD
8 6232.54916364 4 × 800 s 0.035802 1972 MD 284 MD 1624 ND
9 6232.58891699 4 × 800 s 0.080087 2018 MD 284 ND 1634 MD
10 6232.62864977 4 × 800 s 0.124349 2012 DD 283 DD 1643 ND
11a 6244.56044152 4 × 800 s 0.416262 1964 MD 286 MD 1590 ND
12 6244.60021716 4 × 800 s 0.460572 2018 MD 286 ND 1620 ND
13 6244.64000450 4 × 800 s 0.504894 2050 MD 288 ND 1611 ND
14 6245.63552455 4 × 800 s 0.613895 1734 ND 287 ND 1454 ND
15 6245.67535221 4 × 800 s 0.658263 1703 ND 288 ND 1412 ND
16a 6245.71511288 4 × 800 s 0.702556 1753 ND 289 ND 1485 ND
17 6254.51437756 4 × 800 s 0.504861 1488 ND 275 ND 1277 MD
18 6254.55412207 4 × 800 s 0.549136 1959 MD 288 ND 1571 ND
19 6254.59394714 4 × 800 s 0.593501 1873 ND 287 ND 1510 ND
20 7326.61890886 4 × 800 s 0.820086 1991 MD 296 ND 1506 ND
21 7326.66079329 4 × 800 s 0.866745 1987 MD 294 ND 1515 MD
22 7326.70220134 4 × 800 s 0.912874 1906 ND 292 ND 1468 DD
23 7337.61241188 4 × 800 s 0.066754 1914 MD 276 MD 1458 MD
24 7337.65343636 4 × 800 s 0.112455 1911 DD 275 MD 1461 ND
25 7337.70094841 4 × 800 s 0.165383 1929 MD 281 MD 1488 ND
26a 7339.61360976 4 × 800 s 0.296071 1938 DD 278 MD 1541 ND
27a 7339.65460177 4 × 800 s 0.341736 1872 ND 273 ND 1482 ND
28b 7339.69683246 4 × 800 s 0.388781 1401 ND 247 ND 1475 ND
29 7412.46045929 4 × 800 s 0.446835 1907 MD 281 ND 1513 ND
30 7412.50162638 4 × 800 s 0.492695 1934 ND 287 ND 1536 ND
31 7412.54282594 4 × 800 s 0.538591 1927 ND 292 ND 1513 MD
32 7413.45749773 4 × 800 s 0.557527 1923 MD 285 MD 1554 ND
33 7413.49866839 4 × 800 s 0.603391 1864 ND 290 ND 1511 ND
34 7413.53974771 4 × 800 s 0.649153 1942 MD 293 ND 1558 ND

Notes. The exposure time of the full sequence, as well as the mid-exposure HJD, are indicated. The rotation phase, φrot is determined with Prot = 0.897673d and T0 = 2 456 185.8380 d. The provided S/N is that of the LSD Stokes I profile calculated with various linemasks. In addition, the magnetic detection status for each observation is indicated (DD = definite detection, MD = marginal detection, and ND = non detection).

(a)

These observations were used in Sect. 4.2 together with the rotation phase-binned measurements from Table 3 to fully cover the rotation period.

(b)

This observation was excluded during the analysis, since two of the sub-exposures were particularly noisy, leading to issues in the corresponding Stokes V profile with a very low S/N.

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