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  Sub-millimetre non-contaminated detection of the disc around TWA 7 by ALMA

Bayo, A., Olofsson, J., Matrà, L., Beamín, J. C., Gallardo, J., de Gregorio-Monsalvo, I., et al. (2019). Sub-millimetre non-contaminated detection of the disc around TWA 7 by ALMA. Monthly Notices of the Royal Astronomical Society, 486, 5552-5557.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-D427-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-D428-F
Genre: Journal Article

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 Creators:
Bayo, A.1, Author
Olofsson, J.1, Author
Matrà, L.1, Author
Beamín, J. C.1, Author
Gallardo, J.1, Author
de Gregorio-Monsalvo, I.1, Author
Booth, M.1, Author
Zamora, C.1, Author
Iglesias, D.1, Author
Henning, Th1, Author
Schreiber, M. R.1, Author
Cáceres, C.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: stellar matter stars: individual: TWA 7 stars: low-mass Astrophysics - Solar and Stellar Astrophysics Astrophysics - Earth and Planetary Astrophysics
 Abstract: Debris discs can be seen as the leftovers of giant planet formation and the possible nurseries of rocky planets. While M-type stars outnumber more massive stars we know very little about the time evolution of their circumstellar discs at ages older than ̃10 Myr. Sub-millimetre observations are best to provide first order estimates of the available mass reservoir and thus better constrain the evolution of such discs. Here, we present ALMA Cycle 3 Band 7 observations of the debris disc around the M2 star TWA 7, which had been postulated to harbour two spatially separated dust belts, based on unresolved far-infrared and sub-millimetre data. We show that most of the emission at wavelengths longer than ̃300 μm is in fact arising from a contaminant source, most likely a sub-mm galaxy, located at about 6.6 arcsec east of TWA 7 (in 2016). Fortunately, the high resolution of our ALMA data allows us to disentangle the contaminant emission from that of the disc and report a significant detection of the disc in the sub-millimetre for the first time with a flux density of 2.1 ± 0.4 mJy at 870 {μ m}. With this detection, we show that the spectral energy distribution can be reproduced with a single dust belt.

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 Dates: 2019
 Publication Status: Published in print
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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: 486 Sequence Number: - Start / End Page: 5552 - 5557 Identifier: -