Exoplanet telescope selected as ESA's next space science mission
A mission to investigate the atmospheres of planets around other stars has been selected by the European Space Agency for launch in the late 2020s, officials announced this week. The space telescope will observe 1,000 exoplanets, using a spectrometer to measure the chemical make-up of their atmospheres.
From article, (ARIEL will launch in mid-2028 on an Ariane 62 rocket from the European-run spaceport in French Guiana, departing to the L2 Lagrange point, a gravitationally-stable location nearly a million miles (1.5 million kilometers) from Earth in the direction away from the sun.
Equipped with a meter-class (1.3-foot) primary mirror, ARIEL’s telescope will observe planets as they pass in front of their host star. A near-infrared spectrometer on-board the observatory will break apart the starlight that passes through each planet’s atmosphere, allowing astronomers to determine how much of it is made up by life-supporting molecules like water vapor, carbon dioxide and methane.
ARIEL will also detect the presence of metallic compounds, ESA said, allowing scientists to tie each exoplanet’s composition to its parent star. With observations of a wide range of planets, ranging from gaseous Jupiter and Neptune-sized worlds to rocky super-Earths, researchers hope to build up a statistical catalog showing how different types of stars may determine the chemistry of their planetary companions.“ARIEL is a logical next step in exoplanet science, allowing us to progress on key science questions regarding their formation and evolution, while also helping us to understand Earth’s place in the Universe,” said Günther Hasinger, ESA director of science. “ARIEL will allow European scientists to maintain competitiveness in this dynamic field. It will build on the experiences and knowledge gained from previous exoplanet missions.”
The new European space telescope will focus on warm and hot planets in orbits hugging their parent stars. Heat energy keeps a planet’s atmosphere circulating and can pull out molecules from a planet’s interior, giving telescopes an accurate measurement of a faraway world’s bulk composition.
Another sensor in ARIEL’s science package will be capable of detecting the presence of clouds in the atmospheres of exoplanets.
Planned for a four-year mission, ARIEL’s repeated observations of the same planet will allow astronomers, in some cases, to tease out daily and seasonal changes as the world rotates and revolves around its host star.
Some potentially habitable exoplanets could be probed by ARIEL, but the mission’s objectives focus on a broader set of targets.
ESA’s cost cap for the mission is around 450 million euros, or $550 million at current exchange rates. That cost figure does not include financial contributions from ESA members, led by the UK Space Agency, which is set to provide a multimillion-dollar investment to support development of ARIEL’s telescope and science instruments.
The ARIEL science payload will be assembled and tested at the Rutherford Appleton Laboratory in Harwell, Oxfordshire.
France, Italy, Poland, Spain, the Netherlands, Belgium, Austria, Denmark, Ireland, Hungary, Sweden, Czech Republic, Germany and Portugal are also part of the ARIEL consortium. A U.S. contribution to the mission is being studied by NASA.
“It is thanks to the world-leading skills of our innovative space community that a UK-led consortium has been chosen to take forward the next ESA science mission. This demonstrates what a vital role we continue to play in European collaboration on research in space,” said Graham Turnock, chief executive of the UK Space Agency.
“The ARIEL mission is a prime example of the scientific innovation underpinning the wider economy. It relies on the UK’s science and engineering expertise, which are at the forefront of the government’s Industrial Strategy.”
ARIEL won in a competition against two other finalists to become ESA’s fourth medium-class Cosmic Vision missions: THOR, conceived to study fundamental processes in space plasma physics, and XIPE, an X-ray observatory designed to detect emissions from supernovas, galaxy jets, black holes and neutron stars.
ESA’s previous medium-class mission selections were:
- Solar Orbiter, a spacecraft that will study solar physics after launch on a NASA-provided Atlas 5 rocket in 2019
- Euclid, designed to explore the influence of dark energy and dark matter in the universe after launch in 2020 on a Soyuz rocket
- PLATO, an observatory to discovery and measure the mass, size and density of exoplanets after launch in 2026 on a Soyuz rocket)
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