Poster Open Access

In depth view of the debris disk around TWA7

Amelia Bayo; Johan Olofsson; Luca Matrà; Juan Carlos Beamín; José Gallardo; Itziar de Gregorio-Monsalvo; Mark Booth; Catalina Zamora; Daniela Iglesias; Thomas Henning; Matthias R Schreiber; Claudio Cáceres

Debris disks can be seen as the left-overs of giant planet formation and the possible nurseries of rocky planets. While M-type stars out-number more massive stars we know very little about the time evolution of their circumstellar disks at ages older than ∼ 10 Myr. Sub-millimeter observations are best to provide first order estimates of the available mass reservoir and thus better constrain the evolution of such disks. Here, we present ALMA Cycle 3 Band 7 observations of the debris disk around the M2 star TWA7, which had been postulated to harbor two spatially separated dust belts, based on unresolved far-infrared and sub-millimeter 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 6.6ʹʹ 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 disk in the sub-millimeter for the first time with a flux density of 2.1±0.4 mJy at 870 μm. With this detection, we show that the SED can be reproduced with a single dust belt.

Files (3.3 MB)
Name Size
3.3 MB Download
All versions This version
Views 4141
Downloads 4646
Data volume 151.2 MB151.2 MB
Unique views 4040
Unique downloads 4545


Cite as