TELIS-SIR channel


Links and websites Ariel/Echo

Ariel (ESA)

Science Ariel

With Ariel astronomers will be able to measure approximately 1000 transits in three years. For some stars one transit will be enough to get a good spectrum, but others will need approximately ten transits. Astronomers expect to be able to characterize a few hundred exoplanets. SRON is looking to participate in the scientific analysis of the scientific data.

Ariel will be able to study planets with a mass a few times the mass of the Earth (super Earths) to so called hot Jupiters, massive planets that orbit the star closely. By taking a spectrum when the planet is in front of (transit), behind (pure starlight) or beside (star and planetary light) the star, we will be able to take a spectrum of the planet itself. From analyzing the spectrum we can deduce the planets composition, temperature structure and the characteristics of clouds in the atmosphere, if any. Warm exoplanets have well mixed atmospheres. This means that if we study the upper layers of the atmosphere we can be pretty certain that this paints an accurate picture of the the whole atmosphere. Another advantage is that these planets will not have many clouds which will disturb the measurements.

Technology Ariel

Ariel will have an infrared spectrometer between 2 and 8 micrometers with a spectral resolution of about 100. A fine guidance sensor will ensure stability of the pointing but will also chart the variations in the stars atmosphere. Ariel is probably going to use European detectors. When that happens, SRON is planning to use the so called FAIR chip for the read-out of these detectors. SRON is also looking for opportunities to contribute to the assembly, integration & verification.


Links and websites Integral

Integral (ESA)