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- Title
Atomic gas in debris discs.
- Authors
Hales, Antonio S.; Barlow, M. J.; Crawford, I. A.; Casassus, S.
- Abstract
We have conducted a search for optical circumstellar absorption lines in the spectra of 16 debris disc host stars. None of the stars in our sample showed signs of emission line activity in either Hα, CaII or Na I, confirming their more evolved nature. Four stars were found to exhibit narrow absorption features near the cores of the photospheric Ca II and Na I D lines (when Na I D data were available). We analyse the characteristics of these spectral features to determine whether they are of circumstellar or interstellar origins. The strongest evidence for circumstellar gas is seen in the spectrum of HD 110058, which is known to host a debris disc observed close to edge-on. This is consistent with a recent ALMA detection of molecular gas in this debris disc, which shows many similarities to the β Pictoris system.
- Subjects
CIRCUMSTELLAR matter; ABSORPTION; SOLAR granulation; SOLAR photosphere; SOLAR atmosphere
- Publication
Journal of Infectious Diseases, 2017, Vol 466, Issue 3, p3582
- ISSN
0022-1899
- Publication type
Article
- DOI
10.1093/mnras/stw3274