An unusually low density ultra-short period super-Earth and three mini-Neptunes around the old star TOI-561
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Abstract
Based on HARPS-N radial velocities (RVs) and TESS photometry, we present a
full characterisation of the planetary system orbiting the late G dwarf
TOI-561. After the identification of three transiting candidates by TESS, we
discovered two additional external planets from RV analysis. RVs cannot confirm
the outer TESS transiting candidate, which would also make the system
dynamically unstable. We demonstrate that the two transits initially associated
with this candidate are instead due to single transits of the two planets
discovered using RVs. The four planets orbiting TOI-561 include an ultra-short
period (USP) super-Earth (TOI-561 b) with period
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1365-2966