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The Atmospheric Remote-Sensing Infrared Exoplanet Large-survey (ARIEL) mission has been selected by ESA as M4 in the Cosmic Vision programme for a 2028 launch, and is currently in Definition Study phase (phase B1). ARIEL is dedicated to performing measurements of the chemical composition and dynamics of exoplanet atmospheres for a large population (many hundreds) of known diverse preferentially warm and hot transiting planets, thus opening up a new discovery space in the field and enabling the understanding of the physics and chemistry of these far away worlds. The observations will probe atmospheric chemistry and dynamics, by means of infrared spectroscopy in three bands (covering 1.1-7.8 um) and visible/NIR photometry in three bands (covering 0.5-1.1 um). All six bands are observed simultaneously with an off-axis Cassegrain telescope having a ~1.1 x 0.7 m aperture. Both transit and eclipse spectroscopy will be employed to obtain transmission and emission spectra, as well as phase curve observations. The photometry provides thermal and scattering properties and monitors stellar activity. ARIEL will conduct its observations from a large halo orbit around the Sun-Earth L2 point. It is recognized that the data will be of great interest to the entire exoplanet community. ARIEL wants to embrace the general community, by offering open involvement in target selection, and by providing an open data policy. Regular timely public releases of high quality data products at various processing levels will be provided throughout the mission. In this talk I will provide an overview of all aspects of the mission, describe the current ongoing activities in ESA, the ARIEL Consortium, and industry, and the overall schedule.

GoranPilbratt: ARIEL: ESA's mission to study the nature of exoplanets