De-jittering Ariel: An optimized algorithm

The European Space Agency’s Ariel mission, scheduled for launch in 2029, aims to conduct the first large-scale survey of atmospheric spectra of transiting exoplanets. Ariel achieves the high photometric stability on transit timescales required to detect the spectroscopic signatures of chemical eleme...

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Vydáno v:Experimental astronomy Ročník 59; číslo 3; s. 31
Hlavní autoři: Bocchieri, Andrea, Mugnai, Lorenzo V., Pascale, Enzo, Papageorgiou, Andreas, Syty, Angèle, Tsiaras, Angelos, Eccleston, Paul, Savini, Giorgio, Tinetti, Giovanna, Broquet, Renaud, Chapman, Patrick, Sechi, Gianfranco
Médium: Journal Article
Jazyk:angličtina
Vydáno: Dordrecht Springer Netherlands 01.06.2025
Springer Nature B.V
Témata:
Algorithms
Astronomical instruments
Astronomy
Chemical elements
Chemistry and Earth Sciences
Computer Science
Data processing
Data reduction
Extrasolar planets
Instrumentation
Observations and Techniques
Photometry
Photons
Physics
Physics and Astronomy
Planetary atmospheres
Point spread functions
Sensors
Service modules
Space missions
Spacecraft
Spatial data
Spectra
Spectroscopy
Stability
Statistics for Engineering
Systematics
Telescopes
Time series
Transit
Vibration
Wavelengths
Jitter
Detrending
Spectroscopy
Photometry
Space mission
ISSN:0922-6435, 1572-9508
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Shrnutí:The European Space Agency’s Ariel mission, scheduled for launch in 2029, aims to conduct the first large-scale survey of atmospheric spectra of transiting exoplanets. Ariel achieves the high photometric stability on transit timescales required to detect the spectroscopic signatures of chemical elements with a payload design optimized for transit photometry that either eliminates known systematics or allows for their removal during data processing without significantly degrading or biasing the detection. Jitter in the spacecraft’s line of sight is a source of disturbance when measuring the spectra of exoplanet atmospheres. We describe an improved algorithm for de-jittering Ariel observations simulated in the time domain. We opt for an approach based on the spatial information on the Point Spread Function (PSF) distortion from jitter to detrend the optical signals. The jitter model is based on representative simulations from Airbus Defence and Space, the prime contractor for the Ariel service module. We investigate the precision and biases of the retrieved atmospheric spectra from the jitter-detrended observations. At long wavelengths, the photometric stability of the Ariel spectrometer is already dominated by photon noise. Our algorithm effectively de-jitters both photometric and spectroscopic data, ensuring that the performance remains photon noise-limited across the entire Ariel spectrum, fully compliant with mission requirements. This work contributes to the development of the data reduction pipeline for Ariel , aligning with its scientific goals, and may also benefit other astronomical telescopes and instrumentation.
Bibliografie:ObjectType-Article-1
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ISSN:0922-6435
1572-9508
DOI:10.1007/s10686-025-09999-3