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.; Booth, M.; Zamora, C.; Iglesias, D.; Henning, Th; Schreiber, M. R.; Cáceres, C.

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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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https://ui.adsabs.harvard.edu/abs/2019MNRAS.486.5552B
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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: https://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.