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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