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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 ISSN 0035-8711.

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Official URL: http://dx.doi.org/10.1093/mnras/stz2888

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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
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:
DateEvent
21 December 2019Published
10 October 2019Accepted
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 (Creative Commons)
Copyright Holders: 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
Date of first compliant deposit: 27 November 2019
Date of first compliant Open Access: 27 November 2019
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDIniciativa Científica Mileniohttp://viaf.org/viaf/130928259
1190748[FONDECYT] Fondo Nacional de Desarrollo Científico y Tecnológicohttp://dx.doi.org/10.13039/501100002850
UNSPECIFIEDUniversidad de Valparaísohttp://dx.doi.org/10.13039/501100004427
1180395[FONDECYT] Fondo Nacional de Desarrollo Científico y Tecnológicohttp://dx.doi.org/10.13039/501100002850
UNSPECIFIEDChinese Academy of SciencesUNSPECIFIED
UNSPECIFIED[RS] Royal Societyhttp://dx.doi.org/10.13039/501100000288
21170650[CONICYT] Comisión Nacional de Investigación Científica y Tecnológicahttp://dx.doi.org/10.13039/501100002848
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