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The power of wavelets in transit and phase curve parameter determination

Csizmadia, Szilard (2023) The power of wavelets in transit and phase curve parameter determination. 2023 EMAC Workshop, 2023-02-07 - 2023-02-09, NASA Goddard Space Flight Center and Zoom (hybrid).

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Stellar photometric variability and instrumental effects, like cosmic ray hits, data discontinuities, data leaks, instrument aging etc. cause difficulties in the characterization of exoplanets and have an impact on the accuracy and precision of the modelling and detectability of transits, occultations and phase curves. This work aims to make an attempt to improve the transit, occultation and phase-curve modelling in the presence of strong stellar variability and instrumental noise. We invoke the wavelet-formulation to reach this goal. We explore the capabilities of the software package Transit and Light Curve Modeller (TLCM). It models the RV-curve + light curve: transit, occultation, beaming, ellipsoidal and reflection effects in the light curves (including the gravity darkening effect, too). The red-noise, the stellar variability and instrumental effects are modelled via wavelets. The wavelet-fit is constrained by prescribing that the final white noise level must be equal to the average of the uncertainties of the photometric data points. This helps to avoid the overfit and regularizes the noise model. The approach was tested by injecting synthetic light curves into Kepler’s short cadence data and then modelling them. We give limits in terms of signal-to-noise ratio for every studied system parameter which is needed to accurate parameter retrieval. The wavelet-approach is able to manage and to remove the impacts of data discontinuities, cosmic ray events, long-term stellar variability and instrument ageing, short term stellar variability and pulsation and flares among others. Precise light curve models combined with the wavelet-method and with well prescribed constraints on the white noise are able to retrieve the planetary system parameters, even when strong stellar variability and instrumental noise including data discontinuities are present.

Item URL in elib:https://elib.dlr.de/197174/
Document Type:Conference or Workshop Item (Speech)
Title:The power of wavelets in transit and phase curve parameter determination
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:9 February 2023
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:exoplanets transit photometry data analysis
Event Title:2023 EMAC Workshop
Event Location:NASA Goddard Space Flight Center and Zoom (hybrid)
Event Type:international Conference
Event Start Date:7 February 2023
Event End Date:9 February 2023
Organizer:NASA Goddard Space Flight Center, Exoplanet Modelling and Analsysis Center
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project PLATO - PMC and Science
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Csizmadia, Szilard
Deposited On:12 Sep 2023 10:39
Last Modified:24 Apr 2024 20:57

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