A survey of the linear polarization of directly imaged exoplanets and brown dwarf companions with SPHERE-IRDIS - First polarimetric detections revealing disks around DH Tau B and GSC 6214-210 B

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Volume 647 (March 2021)

A&A, 647 (2021) A21

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Table 3

Degree and angle of linear polarization, including the uncertainties, of the parent star DH Tau A and the companion DH Tau B as measured in H-band for each of the five data sets and the data set created by mean-combining the final images of the 2019-10-24, 2019-10-25A, and 2019-10-25Bdata sets.

Data set	P_star (%)	χ_star (°)	P_com (%)	χ_com (°)	S∕N q_com	S∕N u_com
2019-08-17	0.08 ± 0.01	83 ± 10	0.4 ± 0.1	46 ± 9	0.1	3.1
2019-09-16	0.23 ± 0.01	114 ± 2	0.6 ± 0.2	51 ± 9	0.6	3.3
2019-10-24	0.11 ± 0.01	119 ± 3	0.51 ± 0.04	56 ± 3	4.3	10.6
2019-10-25A	0.16 ± 0.01	145 ± 2	0.49 ± 0.05	51 ± 3	2.1	9.9
2019-10-25B	0.27 ± 0.02	123 ± 2	0.48 ± 0.05	66 ± 3	6.4	7.4
Mean combined	0.172 ± 0.009	128 ± 1	0.48 ± 0.03	58 ± 2	7.7	16.1

Notes. P_star and χ_star are the degree and angle of linear polarization of the parent star DH Tau A, respectively, and P_com and χ_com are the degree and angle of polarization of the companion DH Tau B. S/N q_com and S/N u_com are the S/Ns with which the q- and u-signals of DH Tau B are detected.

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