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

MPS-Authors

Bayo,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Olofsson,  J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Matrà,  L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Beamín,  J. C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gallardo,  J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

de Gregorio-Monsalvo,  I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Booth,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zamora,  C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Iglesias,  D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Henning,  Th
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Schreiber,  M. R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cáceres,  C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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Citation

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.


Cite as: http://hdl.handle.net/21.11116/0000-0005-D427-0
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.