1. High mass loss rate AGB star need a large atmosphere. Its photosphere will be around 1.5au. ​Liljegren et al. (2016) use 1.5au AGB and achieved 3\times10^{-6}M_{\odot}/yr. However, 1.5au will be too large for us. The tidal force will be 50% of the gravitational force from the AGB star. The highest mass loss rate I can do is 10^{-7}M_{\odot}/yr