Extended Data Fig. 5: ESPaDOnS spectropolarimetry of the host star 8 UMi and active red giant TYC 3542-1885-1. | Nature

Extended Data Fig. 5: ESPaDOnS spectropolarimetry of the host star 8 UMi and active red giant TYC 3542-1885-1.

From: A close-in giant planet escapes engulfment by its star

Extended Data Fig. 5: ESPaDOnS spectropolarimetry of the host star 8 UMi and active red giant TYC 3542-1885-1.

The least-squares deconvolution profiles in each panel, from top to bottom, are that of Stokes V, null polarisation N, and Stokes I, respectively. Error bars indicate 1σ (standard deviation) uncertainties for the profiles. Included are the Stokes V mean longitudinal magnetic field strength (BZ) and its corresponding 1σ (standard deviation) uncertainty, polarimetric signal-to-noise ratio (SNR), and observation times (t) in BJD - 2459000. Panels (a–d) correspond to observations of 8 UMi, whilst panels (e–h) correspond to observations of TYC 3542-1885-1.

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