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    Atomic gas in debris discs

    Hales, A.S. and Barlow, M.J. and Crawford, Ian and Casassus, S. (2016) Atomic gas in debris discs. Monthly Notices of the Royal Astronomical Society 466 (3), pp. 3582-3593. ISSN 0035-8711.

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    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, Ca ii 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.

    Metadata

    Item Type: Article
    Additional Information: ©: 2016, The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
    Keyword(s) / Subject(s): techniques, spectroscopic, circumstellar matter
    School: Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences
    Depositing User: Administrator
    Date Deposited: 31 Jan 2017 14:14
    Last Modified: 31 Jan 2017 14:14
    URI: http://eprints.bbk.ac.uk/id/eprint/18051

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