Séminaire IPAG

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The mysterious phenomenon of hot exozodiacal dust: the variable dust around kappa Tucanae

jeudi 19 septembre 2024 - 11h00

Thomas Stuber - U. of Arizona
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There is dust in the close vicinity of main-sequence stars with temperatures of 1000K and more, but as of today this phenomenon is not fully understood. The dust should either sublimate or be repelled by radiation pressure on short time scales and there is no model available to explain the continuous presence of the dust. However, due to the challenging observational requirements, detect dust that is just tens of milliarcseconds separated from a main-sequence star, the observational constraints are limited and based solely on interferometric data. We are working to improve the constraints with new observations using VLTI instruments. I will give an introduction into the topic of hot exozodiacal dust and then present the status of an ongoing analysis of the system kappa Tucanae using VLTI/MATISSE observations. I will close with an outlook into the future regarding observations of hot exozodiacal dust.

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Hôtes : Julien Milli

Salle Manuel Forestini, 414 rue de la piscine, 38400 Saint Martin d'Hères