The debris disc of solar analogue   Ceti: Herschel observations and dynamical simulations of the proposed multiplanet system

τ Ceti is a nearby, mature G-type star very similar to our Sun, with a massive Kuiper Belt analogue and possible multiplanet system that has been compared to our Solar system. We present Herschel Space Observatory images of the debris disc, finding the disc is resolved at 70µm and 160µm, and marginally resolved at 250µm. The Herschel images and infrared photometry from the literature are best modelled using a wide dust annulus with an inner edge between1and10auandanouteredgeat ∼55au,inclinedfromface-onby35 ◦ ±10 ◦ ,andwith no significant azimuthal structure. We model the proposed tightly packed planetary system of five super-Earths and find that the innermost dynamically stable disc orbits are consistent with the inner edge found by the observations. The photometric modelling, however, cannot rule out a disc inner edge as close to the star as 1 au, though larger distances produce a better fit to the data. Dynamical modelling shows that the five-planet system is stable with the addition of a Neptune or smaller mass planet on an orbit outside 5 au, where the radial velocity data analysis would not have detected a planet of this mass.

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