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Table 1

Log from our ATCA observations.

Low-frequency (1.62 GHz) observations
Time (a) Phase (b) Phase (c) Stokes I (d) rms(I) (e) Stokes V (f) rms(V) (g) pV (h) σ(pV) (i)
(days) (0–1) (degrees) (mJy) (mJy beam−1) (mJy) (mJy beam−1)
12.673 0.2593 93.34 0.342 0.049 0.212 0.037 0.62 0.14
13.677 0.3490 125.65 0.309 0.069 0.194 0.048 0.63 0.21
14.669 0.4377 157.58 0.173 0.056 ∣ <0.126∣ 0.042 <0.73
15.675 (j) – – – – – – – –
16.656 0.6154 221.53 <0.204 0.068 ∣ <0.126∣ 0.042
17.567 0.6968 250.85 0.364 0.059 0.213 0.047 0.59 0.16
18.654 0.7940 285.84 0.816 0.053 0.301 0.044 0.37 0.06
19.654 0.8834 318.01 0.672 0.053 0.545 0.047 0.81 0.09
20.657 0.9731 350.32 <0.228 0.076 ∣ <0.147∣ 0.049
21.656 0.0624 22.45 0.196 0.059 ∣ <0.129∣ 0.043 <0.66
22.407 0.1295 46.61 <0.171 0.057 ∣ <0.123∣ 0.041
23.637 0.2394 86.20 <0.234 0.078 ∣ <0.126∣ 0.042
24.514 0.3179 114.44 0.279 0.038 −0.127 0.024 0.46 0.11
25.634 0.4180 150.48 0.330 0.057 −0.142 0.040 0.43
26.867 0.5281 190.13 <0.213 0.071 ∣ <0.174∣ 0.058
27.634 0.5968 214.84 0.339 0.053 −0.230 0.043 0.68 0.17
28.634 0.6862 247.02 4.967 0.078 −4.623 0.055 0.93 0.02
29.634 0.7756 279.22 1.504 0.050 −1.208 0.045 0.80 0.04
High-frequency (2.52 GHz) observations
12.673 0.2593 93.34 0.210 0.034 ∣ <0.090∣ 0.030 <0.43
13.677 0.3490 125.65 0.315 0.041 ∣ <0.096∣ 0.032 < 0.30
14.669 0.4377 157.58 0.212 0.035 ∣ <0.090∣ 0.030 <0.43
15.675 0.5277 189.96 0.462 0.050 ∣ <0.120∣ 0.040 < 0.26
16.656 0.6154 221.53 0.231 0.036 ∣ <0.090∣ 0.030 <0.39
17.567 0.6968 250.85 0.108 0.030 ∣ <0.096∣ 0.032 < 0.89
18.654 0.7940 285.84 0.551 0.033 0.139 0.034 0.25 0.06
19.654 0.8834 318.01 0.167 0.033 ∣ <0.093∣ 0.031 < 0.55
20.657 0.9731 350.32 <0.126 0.042 ∣ <0.096∣ 0.032
21.656 0.0624 22.45 0.168 0.038 ∣ <0.093∣ 0.031 <0.55
22.407 0.1295 46.61 <0.126 0.042 −0.148 0.034
23.637 0.2394 86.20 0.139 0.042 ∣ <0.093∣ 0.031 <0.67
24.514 0.3179 114.44 0.337 0.019 -0.053 0.017 0.16 0.05
25.634 0.4180 150.48 0.312 0.036 ∣ <0.108∣ 0.036 <0.35
26.867 0.5281 190.13 0.169 0.042 ∣ <0.120∣ 0.040 < 0.71
27.634 0.5968 214.84 0.544 0.034 −0.167 0.032 0.31 0.06
28.634 0.6862 247.02 0.307 0.036 −0.110 0.030 0.36 0.11
29.634 0.7756 279.22 0.583 0.034 −0.520 0.037 0.89 0.08

Notes. (a) Mean time of each observing session, given in days, in April 2017. (b) Orbital phase of Proxima b, measured from 0 to 1. (c)Orbital phase of Proxima b, measured in degrees from 0 to 360. (d)Total flux density of Proxima. For non-detections 3σ upper limits are given. (e)rms of total flux density. (f)Circularly polarized flux density. For non-detections we give 3σ upper limits to its absolute value. (g)rms of circularly polarized flux density. (h)Fraction of circular polarization (V/I). When I is detected, but not V, we give upper limits to the polarization fraction as 3 × rms(V)∕I. (i) 1σ uncertainty on the fraction of circular polarization, pV. (j) For the epoch April 15.675, the low-frequency data had to be severely flagged, so obtaining an image was not possible.

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