High-precision photometry with Ariel

Szabó, Gyula; Kálmán, Szilárd; Pribulla, T.; Claret, A.; Mugnai, Lorenzo V.; Pascale, Enzo; Waltham, Dave; Borsato, L.; Garai, Z.; Szabo, Robert M.

doi:10.1007/s10686-021-09777-x

Cited by 6 publications

(8 citation statements)

References 86 publications

(97 reference statements)

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“…This paper extends the work of Szabó et al [46], Borsato et al [7], and Garai [18] and focusses on some straightforward applications to stellar astrophysics along with some more speculative potential applications. Section 2 focusses on advances that can be made through the application of Ariel's Core Survey data to stellar astrophysics.…”

Section: Introductionmentioning

confidence: 56%

“…Ariel may further contribute more generally through well-constrained empirical limb-darkening coefficients for host stars of the full Ariel planet transit survey (cf. Dravins et al [15], Szábo et al [46]). These may allow limb darkening coefficients to be more accurately assigned by matching stellar characteristics.…”

Section: Limb-darkening Coefficients As a Function Of Stellar Parametersmentioning

confidence: 99%

“…Coadding VISphot, FGS1, and FGS2 data in 30 min bins, Ariel can achieve optical intensity light curves with ~35 ppm standard deviation for typical bright targets (cf. [49], Szábo et al [46]). Numerical simulations suggest that the sizes of stellar photospheric granules scale inversely with stellar surface gravity.…”

Section: Stellar Variability Across the Herzsprung-russell Diagrammentioning

confidence: 99%

“…ARIEL's suite of instruments are all capable of producing sensitive, high cadence data, and systematic effects in their light curves should be largely uncorrelated. This will help enormously in promptly resolving debates like that on Kepler-1625 b's putative moon [46]. Heller [21] gives a comprehensive review of the methods which can reveal both exomoons and exorings.…”

Section: Exomoons and Exoringsmentioning

confidence: 99%

“…This short paper outlines a variety of science which might be executed with the ground-breaking data included in Ariel's Core Survey. A very short summary of some of these potential extended use applications of the Ariel Core Survey data is included in Tinetti et al [49]; further examples and more detailed discussions can also be found in Szabó et al [46], Borsato et al [7], and Garai (2020).…”

Section: Introductionmentioning

confidence: 99%

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Extended use of the Ariel Core Survey Data

Haswell

2021

Exp Astron

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Section: Introductionmentioning

confidence: 56%

Section: Limb-darkening Coefficients As a Function Of Stellar Parametersmentioning

confidence: 99%

Section: Stellar Variability Across the Herzsprung-russell Diagrammentioning

confidence: 99%

Section: Exomoons and Exoringsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Extended use of the Ariel Core Survey Data

Haswell

2021

Exp Astron

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Exocomet Models in Transit: Light Curve Morphology in the Optical—Near Infrared Wavelength Range

Kálmán,

Szabó,

Kiss

2024

PASP

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Following the widespread practice of exoplanetary transit simulations, various presumed components of an extrasolar system can be examined in numerically simulated transits, including exomoons, rings around planets, and the deformation of exoplanets. Template signals can then be used to efficiently search for light curve features that mark specific phenomena in the data, and they also provide a basis for feasibility studies of instruments and search programs. In this paper, we present a method for exocomet transit light curve calculations using arbitrary dust distributions in transit. The calculations, spanning four distinct materials (carbon, graphite, pyroxene, and olivine), and multiple dust grain sizes (100–300 nm, 300–1000 nm, and 1000–3000 nm) encompass light curves in VRJHKL bands. We also investigated the behavior of scattering colors. We show that multicolor photometric observations are highly effective tools in the detection and characterization of exocomet transits. They provide information on the dust distribution of the comet (encoded in the light curve shape), while the color information itself can reveal the particle size change and material composition of the transiting material, in relation to the surrounding environment. We also show that the typical cometary tail can result in the wavelength dependence of the transit timing. We demonstrate that multi-wavelength observations can yield compelling evidence for the presence of exocomets in real observations.

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Converting the sub-Jovian desert of exoplanets to a savanna with TESS, PLATO, and Ariel

Kálmán

Szabó

Borsato

et al. 2023

Monthly Notices of the Royal Astronomical Society

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There is a lack of exoplanets with sizes similar to Neptune orbiting their host stars with periods ≲ 3 days – hence the name “sub-Jovian/Neptune desert”. Recently, several exoplanets have been confirmed to reside in the desert transforming it into a “savanna” with several “giraffe” planets (such as LTT 9779 b and TOI-674 b). The most prominent scenarios put forward for the explanation of the formation of the desert are related to the stellar irradiation destroying the primary atmosphere of certain specific exoplanets. We aim to present three targets (LTT 9779 b, TOI-674 b and WASP-156 b) which, when observed at wide wavelength ranges in infrared (IR), could prove the presence of these processes, and therefore improve the theories of planetary formation/evolution. We simulate and analyse realistic light curves of the selected exoplanets with PLATO/NCAM and the three narrow-band filters of Ariel (VISPhot, FGS1 and FGS2) based on TESS observations of these targets. We improved the precision of the transit parameters of the three considered planets from the TESS data. We find that the combination of the three narrow-band filters of Ariel can yield inner precision of $\lesssim 1.1\%$ for the planetary radii. Data from the three telescopes together will span decades, allowing the monitoring of changes in the planetary atmosphere through radius measurements. The three selected “giraffe” planets can be golden targets for Ariel, whereby the loss of planetary mass due to stellar irradiation could be studied with high precision, multi-wavelength (spectro-)photometry.

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High-precision photometry with Ariel

Cited by 6 publications

References 86 publications

Extended use of the Ariel Core Survey Data

Extended use of the Ariel Core Survey Data

Exocomet Models in Transit: Light Curve Morphology in the Optical—Near Infrared Wavelength Range

Converting the sub-Jovian desert of exoplanets to a savanna with TESS, PLATO, and Ariel

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