Abstract
In this paper we describe the photometry instruments of Ariel, consisting of the VISPhot, FGS1 and FGS2 photometers in the visual and mid-IR wavelength. These photometers have their own cadence, which can be independent from each other and the cadence of the spectral instruments. Ariel will be capable to do high cadence and high precision photometry in independent bands. There is also a possibility for synthetic Jsynth, Hsynth, and wide-band thermal infrared photometry from spectroscopic data. Although the cadence of the synthetic bands will be identical to that of the spectrographs, the precision of synthetic photometry in the suggested synthetic bands will be at least as precise as the optical data. We present the accuracy of these instruments. We also review selected fields of new science which will be opened up by the possibility of high cadence multiband space photometry, including stellar rotation, spin-orbit misalignment, orbital precession, planetary rotation and oblateness, tidal distortions, rings, and moons.
Highlights
High precision photometry of exoplanets opened a rich collection of tools for measuring the fundamental planet properties and to derive constraints for their internal composition and the atmosphere [6, 19, 20, 30, 33, 37, 85]
The most secure detection of a moon is observing a consistent combination of different light curve characteristics, including transit time variations (TTVs), transit duration variations (TDVs), and most preferentially, a light curve distortion that is characteristic to a moon (Fig. 8)
4 Summary In this paper, we gave a description of the Ariel photometric system, consisting the measurements of VISPhot, FGS1, FGS2 photometers and synthetic photometry in Jsynth, Hsynth and wide-band Thermal bands, derived from the signal of NIRSpec and AIRS spectra, in term of performance in planet parameter determination in a wide palette of stellar and planet parameters
Summary
High precision photometry of exoplanets opened a rich collection of tools for measuring the fundamental planet properties and to derive constraints for their internal composition and the atmosphere [6, 19, 20, 30, 33, 37, 85]. The role of the present paper is to 1) predict the precision in planet parameter determination for various planets around various stellar types; and 2) to explore new science that can be reached with help of the forthcoming multiband Ariel photometric data. According to this dual aim, this paper consists of two major parts. A couple of new science cases are investigated for their feasibility with Ariel, and we conclude about the expected performance of these ”exotic” observations
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