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

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 p.m is in lac( arising from a contaminant source, most likely a sub-min galaxy, located al 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 ntly at 870 p.m. With this detection, we show that the spectral energy distribution can be reproduced with a single dust belt.