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Fig. 2

image

Averaged HARPS spectra of β Pictoris (flux as a function of wavelength in Å). They reveal the very high S/N achieved, even at very short wavelengths at 3820 Å and 3860 Å. Each detected Fe I line is indicated by a tick mark at +20.5 km s-1, i.e., the β Pictoris heliocentric radial velocity. The detected signatures are due to the stable gas within the circumstellar disk. Left: section of the spectrum from 3820 to 3827 Å. Three lines are detected: one line from the 6928 cm-1 excited levels at 3820.7 Å, one line from the ground base level near 3824.7 Å, and one line from the 7377 cm-1 excited levels at 3823.15 Å. Right: spectral region from 3856 to 3861 Å. The strongest Fe I line from ground base level is seen near 3860.15 Å, as well as the line from the 416 cm-1 excited level (noted Fe I* near 3856.65 Å).

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