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An unusually large gaseous transit in a debris disc
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Iglesias, Daniela P, Olofsson, Johan, Bayo, Amelia, Zieba, Sebastian, Montesinos, Matías, Smoker, Jonathan, Kennedy, Grant M., Godoy, Nicolás, Pantoja, Blake, Talens, Geert Jan, Wahhaj, Zahed and Zamora, Catalina (2019) An unusually large gaseous transit in a debris disc. Monthly Notices of the Royal Astronomical Society, 490 (4). pp. 5218-5227. doi:10.1093/mnras/stz2888
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Official URL: http://dx.doi.org/10.1093/mnras/stz2888
Abstract
We present the detection of an unusually large transient gas absorption in several ionized species in the debris disc star HD 37306 using high-resolution optical spectra. We have been analysing a large sample of debris discs searching for circumstellar gas absorptions aiming to determine the frequency of gas in debris discs. HD 37306 stood out showing remarkably broad absorptions superimposed on to several photospheric Ca II, Fe II, and Ti II lines. The observed absorptions, unlike typical exocometary transits, lasted for at least eight days. Here, we analyse simultaneous spectroscopic and photometric data of the event and evaluate different scenarios that might explain the observed features. We conclude that the most likely scenario might be an exocometary break-up releasing a significant amount of gas close to the star, producing an occulting `ring'/`torus' shape.
| Item Type: | Journal Article | ||||||||||||||||||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||||||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Comets, Circumstellar matter, Planetary systems | ||||||||||||||||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||||||||||||||
| Publisher: | Wiley | ||||||||||||||||||||||||
| ISSN: | 0035-8711 | ||||||||||||||||||||||||
| Official Date: | 21 December 2019 | ||||||||||||||||||||||||
| Dates: |
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| Volume: | 490 | ||||||||||||||||||||||||
| Number: | 4 | ||||||||||||||||||||||||
| Page Range: | pp. 5218-5227 | ||||||||||||||||||||||||
| DOI: | 10.1093/mnras/stz2888 | ||||||||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||||||||
| Access rights to Published version: | Open Access | ||||||||||||||||||||||||
| Copyright Holders: | 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society | ||||||||||||||||||||||||
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