ARIEL - ESA M-class Mission Proposal

ARIEL survived the initial downselect for ESA's M-Class Cosmic Vission
Atmospheric Remote-Sensing Infrared Exoplanet Large-survey
http://ariel-m4.sciencesconf.org/

https://www.beaconreader.com/katharine-sanderson/space-missions-out-of-the-running-in-european-competition

I think ARIEL is the new designation of EChO :

« …One team that did pass the technical review, is the exoplanet-chasing mission once called EChO, now re-jigged and re-named ARIEL (Atmospheric Remote-sensing Infrared Exoplanet Large survey). Bruce Swinyard, part of the ARIEL team, based at University College London, says the new-version of EChO is the previous version, “put on a diet”… »

http://spaceflightnow.com/2015/06/04/esa-reveals-candidates-for-new-space-science-missions/

In a separate announcement Thursday, ESA unveiled its top three picks for a new “medium-class” science mission due for launch in 2025.

The three candidate missions — ARIEL, THOR and XIPE — were culled from a list of 27 proposals. They will now undergo thorough evaluations before ESA officials decide on one project to proceed toward launch.

a pdf :

http://www.astropa.inaf.it/~giusi/WOW/ROMA_2014/S4_05_Micela.pdf