Press Release 21st March 2018
ARIEL Exoplanet Mission Selected by the European Space Agency
ARIEL – a mission to answer fundamental questions about how planetary systems form and evolve, of which Prof Tom Ray of Dublin Institute for Advanced Studies (DIAS) is Co-Principal Investigator – has been selected by the European Space Agency (ESA) as its next medium-class science mission, due for launch in 2026.
During a 4-year mission, ARIEL will observe 1000 planets orbiting distant stars and make the first large-scale survey of the chemistry of exoplanet atmospheres. ESA’s Science Programme Committee announced the selection of ARIEL from three candidate missions on 21st March 2018.
The ARIEL mission has been developed by a consortium from 15 ESA member states including Ireland, UK, France, Italy, Poland, Spain, the Netherlands, Belgium, Austria, Denmark, Ireland, Hungary, Sweden, Czech Republic, Germany, Portugal, with an additional contribution from NASA in the USA.
University College London (UCL) is the primary lead for the mission and DIAS is providing both hardware and manpower. Irish funding for ARIEL will come from ESA’s PRODEX programme that is supported by the Government of Ireland and managed by Enterprise Ireland.
ARIEL’s Co-Principal Investigator, Prof Tom Ray of DIAS said, “It is wonderful news that ESA have selected ARIEL. At this stage we have discovered almost 4,000 planets around nearby stars but very little is known about them beyond their size and how far they are from their parent star. ARIEL will study a large number of exoplanets to give us a much better picture of what the atmospheres of these planets are like. This will enable us to answer questions about how the chemistry of a planet is linked to its birth and evolution and may ultimately help us understand how planets with benign atmospheres like the Earth form.”
ARIEL’s National Contact in Ireland, Dr Deirdre Coffey of UCD School of Physics, said “It is tremendously exciting that Ireland is directly involved in ESA’s next exoplanet space mission. Rising demand for places in our MSc Space Science & Technology is testament to the increasing attractiveness of Space as a career trajectory for high-tech graduates. Our involvement provides great inspiration for the next generation, and reinforces to our graduates that Ireland is at the forefront of research.”
ARIEL will study a diverse population of exoplanets ranging from Jupiter- and Neptune-size planets down to super-Earths, in a wide variety of environments. While some of the planets may be in the habitable zones of their stars, the main focus of the mission will be on warm and hot planets in orbits close to their star. The scorching temperatures experienced by planets close to their stars, which can be hotter than 2000 degrees Celsius, also mean that more molecules from the planet’s interior make their way into the atmosphere. This provides ARIEL with better information about the planet’s internal composition and the formation history of the planetary system.
ARIEL will have a meter-class telescope primary mirror to collect visible and infrared light from distant star systems. A 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 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. DIAS will contribute special filters to split the light up into different portions of the optical and infrared spectrum before the light is fed to ARIEL’s different instruments.
ARIEL will be launched from Kourou in French Guiana and 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. Here, the spacecraft is shielded from the Sun and has a clear view of the whole sky to maximise the possible target exoplanets for observations. This is close to where the James Webb Space Telescope, due for launch next year, will be located. This is another mission involving DIAS.
ARIEL Co-Principal Investigator Science and Media Contact
Prof Tom Ray,
Dublin Institute for Advanced Studies
Mob: +353 (0)87 9062696
Dr Deirdre Coffey
UCD School of Physics
Notes to the Editor:
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 low resolution spectrometers covering the range from 0.5 to 7.8 microns in wavelength.
Mission lifetime: 4 years in orbit
Launch date: 2027 or 2028
Payload mass: ~450 kg
Total Spacecraft Dry mass: ~1200 kg
Launch mass: ~1300kg
Destination: Sun – Earth Lagrange Point 2 (L2)
ESA Mission Cost: ~450 million Euros, plus nationally funded contributions to the payload
Launch vehicle: Ariane 6-2 from French Guiana
For further information on ARIEL see: http://ariel-spacemission.eu
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
Artist’s impression of ARIEL on its way to Lagrange Point 2 (L2). Here, the spacecraft is shielded from the Sun and has a clear view of the whole sky. Image Credit: ESA/STFC RAL Space/UCL/Europlanet-Science Office
The DIAS Summer School on High-Energy Astrophysics 2018 is the second summer school organised by the Centre for Astroparticle Physics and Astrophysics (CAPPA), part of the Dublin Institute for Advanced Studies (DIAS), and is hosted by Dublin City University (DCU). The school is aimed at motivated young researchers beginning their careers (in particular PhD students and young postdocs), with the a focus on “filling in the gap” between University education and University-level research. The first announcement can be found here.
More details can be found here : https://www.dias.ie/cappa/SummerSchool2018/
“Brave new worlds: the planets in our galaxy” by Professor Giovanna Tinetti, University College London (abstract)
Tonight RTE 1 screens a documentary on how Ireland built part the largest radio telescope in the World. LOFAR (The Low-Frequency Array) is an international effort to study the Universe at the lowest radio frequencies, straddling either side of the familiar VHF band. Historical resonances abound in that the radio telescope is on the same site as the famous Leviathan of Parsonstown, once the largest optical telescope in the World. Amazingly there is so little radio interference nearby, that it is the radio equivalent of a pristine site high in the Andes when it comes to seeing the stars!
DIAS is a partner in LOFAR and will use it to study the birth of stars and planets. We will also contribute to the complex software required to operate such a telescope across the European continent with our international partners.
The LOFAR Telescope in Birr, County Offaly. DIAS is part of the Irish consortium that constructed it and we will use it to study how stars like our Sun are born and also how they die.