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Contributed talk at the virtual workshop Exoplanets Orbits & Dynamics hosted by University of Liege on Jan. 19-22, 2021. Workshop website: https://sites.google.com/view/exodynamics/home

The orbits and dynamics of exoplanet systems can unveil their tales of formation, migration, interactions with their host star, and even their atmospheric properties. Nowadays, TESS delivers an unprecedented wealth of new data on this matter, but how can we handle all of it? Here, I will present how we can untangle exoplanets' orbits and dynamics using allesfitter, an open-source python software for flexible and robust inference of stars and exoplanets from photometric and radial velocity data. Allesfitter offers a rich selection of orbital and transit/eclipse models, accommodating multiple exoplanets, multi-star systems, transit-timing variations, phase curves. It can also help mitigate "unwanted signals", such as stellar variability, starspots, and stellar flares (or help study them). I will highlight some of allesfitter's science output on examples of exoplanet TTVs (e.g., TOI-216 and TOI-270) and orbital phase curves (e.g., WASP-18 and WASP-121). With TESS' extended mission, a wealth of new data soon face us, allowing TTV and phase curve studies of dozens of such systems over many years.

Maximilian Günther: Studying exoplanet orbits & dynamics with allesfitter