Poster Open Access

# How the stellar flicker noise affects the characterization of planetary transits ?

Sulis Sophia

### Citation Style Language JSON Export

{
"publisher": "Zenodo",
"DOI": "10.5281/zenodo.5552619",
"language": "eng",
"title": "How the stellar flicker noise affects the characterization of planetary transits ?",
"issued": {
"date-parts": [
[
2021,
10,
6
]
]
},
"abstract": "<p>Stellar activity is known to limit exoplanet detection and characterization. Among this activity, stellar convection (flicker&#39;&#39;) evolves during the typical transit timescales (~ hours) and affects the inferred transit parameters.<br>\nWe generated realistic simulations of transiting exoplanets based on solar HMI data. These simulations include planets from 1 to 10 Earth radii with different transit geometries. These simulations comprising hundreds of light curves are available to the community : https://doi.org/10.5281/zenodo.3686871<br>\nWe analyzed the data using standard MCMC methods assuming the noise is white and Gaussian (WGN), or a Gaussian Process (GP). We show that, in both cases, the resulting planet parameters can be affected by biases,<br>\nwhich leads to biased planetary radius measurements. This demonstrates the need to develop robust stellar noise modeling to achieve PLATO&#39;s goal of characterizing exoplanets transiting solar-like stars.<br>\nNext steps of this study will be to investigate<br>\ni) how other noise sources (e.g., flares, spots and faculae) affect the inferred exoplanet parameters,<br>\nii) which noise modeling allows to derive the most accurate transit parameters.</p>",
"author": [
{
"family": "Sulis Sophia"
}
],
"type": "graphic",
"id": "5552619"
}
81
46
views