Extended Data Fig. 5: Equivalent widths of helium 5,876-Å and 10,830-Å lines. | Nature

Extended Data Fig. 5: Equivalent widths of helium 5,876-Å and 10,830-Å lines.

From: Helium in the eroding atmosphere of an exoplanet

Extended Data Fig. 5

a, Measurements for 30 stars of different colour indices with 1σ errors from a previous work60. The two helium lines are expected to form in the same stellar-atmosphere regions and their equivalent widths are clearly correlated. Our 5,876-Å line measurement for WASP-107 (colour index B–V > 0.7), obtained from HARPS spectra, is plotted as a red line and the red-shaded region shows the 1σ error. b, Co-added spectra of WASP-107b around the 5,876-Å line of metastable helium from the HARPS radial-velocity campaign (blue line). Absorption lines are fitted with Gaussian profiles, and the best-fit results are shown as green, yellow and red lines, with the sum of the profiles shown in black. The best-fitting line profile of the 5,876-Å line is shaded in grey.

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