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This video is captioned.

Abstract:
We present the bright, multi-planet system TOI-431, characterised with photometry (from TESS, LCO, NGTS, and Spitzer) and radial velocities (from HARPS, HIRES, iSHELL, FEROS, and MINERVA-Australis).
TOI-431b is a super-Earth with a period of 0.49 days, a radius of 1.28 REarth, a mass of 3.07 MEarth, and a density of 7.96 gcm-3; TOI-431d is a sub-Neptune with a period of 12.46 days, a radius of 3.29 REarth, a mass of 9.90 MEarth, and a density of 1.52 gcm-3. We find a third planet candidate, TOI-431c, in the HARPS and HIRES RV data, but it is not seen to transit in the TESS light curves. It has an Msini of 2.83 MEarth, and a period of 4.85 days.
TOI-431d likely has an extended atmosphere and is one of the most well-suited TESS discoveries for atmospheric characterisation, while the super-Earth TOI-431b may be a stripped core. These planets straddle the radius gap, presenting an interesting case-study for atmospheric evolution, and TOI-431b is a prime TESS discovery for the study of rocky planet phase curves.

You can find a poster that presents the information in this talk here: https://warwick.ac.uk/fac/sci/physics/research/astro/people/aresosborn/2021_stsci_towards_a_comprehensive_characterisation_of_exoplanets_poster.jpg

TOI-431: a super-Earth and sub-Neptune transiting a bright, early K-Dwarf, with an additional RV planet (UKEXOM21)