1 INTRODUCTION
2 ALMA OBSERVATIONS
2.1 Observed Sample
2.2 ALMA Observing Configuration
2.3 Dust Continuum Observations
2.4 Gas Observations
3 MODELLING RESULTS
3.1 Fit of the Continuum Data
3.2 Fit of the Gas Data
4 DISCUSSION
4.1 New Continuum Detections
4.2 First Gas Detection Around a G-type Star: HD 129590
4.3 New Constraints from the CO Gas Detection in HD 121191
4.4 Detection of the Star HD 69830
4.5 Constraints on Exocomet Compositions
4.6 Unexplained CO Gas Detection Close to HD 106906
5 SUMMARY AND CONCLUSIONS