The European Space Agency formally adopts Ariel, the exoplanet explorer

The European Space Agency (ESA) has formally adopted Ariel, the first mission dedicated to study the nature, formation and evolution of exoplanets.

Ariel has passed major feasibility reviews and has been formally adopted into the program of future missions for implementation
It will survey about 1000 planets outside our solar system during its lifetime
Ariel will unveil the nature, formation and evolution of a large and assorted sample of planets around different types of stars in our galaxy

More than 50 institutes from 17 countries have been working over the past 5 years to develop the science goals and design the instrumentation which will enable Ariel to survey a diverse sample of around 1000 planets outside our own solar system.

The mission has passed a rigorous set of reviews which it has been undergoing throughout 2020 to prove the technical feasibility and science case and has now received approval from ESA’s member states, confirming that the team can work towards a launch in 2029.

Professor Giovanna Tinetti, Principal Investigator for Ariel from University College London said, “We are the first generation capable of studying planets around other stars. Ariel will seize this unique opportunity and reveal the nature and history of hundreds of diverse worlds in our galaxy. We can now embark on the next stage of our work to make this mission a reality.”

Ariel will be the first mission dedicated to measuring the chemical composition and atmospheric thermal properties of hundreds of transiting exoplanets. Ariel will give us a picture of a diverse range of exoplanets: from extremely hot to temperate, from gaseous to rocky planets orbiting close to their parent stars.

By looking specifically at hot planets, scientists are expecting to build an understanding of the formation of planets and their evolution. At hotter temperature, which in some cases it can be more than 2000’C, a greater number of exotic molecules will be visible to Ariel. The instruments will then be able to determine what the atmospheres are made up of and provide scientists a unique insight into the planet’s internal composition and the formation history of the planetary system

The Ariel team is taking a very open approach providing rapid access to data and even encouraging enthusiasts to help select targets and characterise stars. Much of the data will be available to both the science community and general public immediately.

“Ariel will enable planetary science far beyond the boundaries of our own Solar System,” says Günther Hasinger, ESA’s Director of Science. “The adoption of Ariel cements ESA’s commitment to exoplanet research and will ensure European astronomers are at the forefront of this revolutionary field for the next decade and well beyond.”

Ariel will have a meter-class telescope primary mirror to collect visible and infrared light from distant star systems. An infrared spectrometer will spread the light into a ‘rainbow’ and extract the chemical fingerprints of gases in the planets’ atmospheres, which become embedded in starlight when a planet passes in front or behind the star. A photometer, a spectrometer and guidance system will capture information on the presence on clouds in the atmospheres of the exoplanets and will allow the spacecraft to point to the target star with high stability and precision.

The Ariel Consortium Project Manager, Paul Eccleston, of STFC RAL Space, said “This represents the culmination of lots of preparatory work by our teams across the world over the last 5 years in order to demonstrate the feasibility and readiness of the payload. We now go full speed ahead to fully develop the design and start building prototypes of the instrumentation on the spacecraft.”

The Ariel mission consortium teams from across Europe will now move on to build and prototype their designs for the payload of Ariel and plan for receiving and processing the data. The industrial contractor for the spacecraft bus, which will support the payload coming from the nationally funded consortium teams, will be selected in the summer 2021.

Images:

Ariel will be placed in orbit around the Lagrange Point 2 (L2), a gravitational balance point 1.5 million kilometres beyond the Earth’s orbit around the Sun. Image Credit: ESA/STFC RAL Space/UCL/Europlanet-Science Office

Link to high-resolution file: https://arielspacemission.files.wordpress.com/2017/11/ariel_lagrange_points_high_res1.jpg

Artist’s impression of Ariel. Image Credit: ESA/STFC RAL Space/UCL/UK Space Agency/ ATG Medialab

Link to high-resolution file: https://arielspacemission.files.wordpress.com/2020/11/ariel-telescope.jpg

A hot planet transits in front of its parent star in this artist impression of an exoplanet system. Credit: ESA/ATG medialab, CC BY-SA 3.0 IGO

Link to high-resolution file: https://www.esa.int/ESA_Multimedia/Images/2018/03/Hot_exoplanet

Videos:
Note: Please get in touch with press contact for mp4 files.
Ariel animations: https://www.youtube.com/channel/UCMLTUdXBPNS_pDJcGNZoLYw
Welcome to Ariel: https://youtu.be/28afJ_5TTGc

Contacts:
Madeleine Russell
Ariel Consortium Communications Lead and RAL Space Communications Manager
Mob: +44 (0) 7594083386
Email: madeleine.russell@stfc.ac.uk

Notes to editors:
Ariel (Atmospheric Remote-Sensing Infrared Exoplanet Large-survey) Facts and Figures

Elliptical primary mirror: 1.1 x 0.7 metres
Instrumentation: 3 photometric channels and 3 spectrometers covering continuously from 0.5 to 7.8 microns in wavelength
Mission lifetime: at least 4 years in orbit
Launch date: 2029
Payload mass: ~500 kg
Launch mass: ~1500kg
Destination: Sun – Earth Lagrange Point 2 (L2)
ESA Mission Cost: ~550 million Euros, plus nationally funded contribution of the payload
Launch vehicle: Ariane 6-2 from French Guiana shared with Comet Interceptor

http://ariel-spacemission.eu
Twitter: @ArielTelescope

Ariel consortium
The Ariel mission payload is developed by a consortium of more than 50 institutes from 17 ESA countries – which include the UK, France, Italy, Poland, Belgium, Spain, the Netherlands, Austria, Denmark, Ireland, Czech Republic, Hungary, Portugal, Norway, Sweden, Germany, Estonia – plus a NASA contribution.

UCL MAPS
www.ucl.ac.uk/mathematical-physical-sciences

STFC RAL Space
RAL Space is an integral part of the Science and Technology Facilities Council’s (STFC) Rutherford Appleton Laboratory (RAL) and is the space hub for UK Research and Innovation. RAL Space carries out world-class space research and technology development with involvement in over 210 instruments on board space missions.
www.ralspace.stfc.ac.uk
Twitter: @RAL_Space_STFC