October 14, 2021 Presentation Open Access

Charlotte Gehan

DCAT Export

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        <foaf:name>Charlotte Gehan</foaf:name>
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    <dct:title>Asteroseismic measurement of the inclination angle: characterizing exoplanetary systems</dct:title>
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        <foaf:name>Eric Michel</foaf:name>
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        <foaf:name>Margarida Cunha</foaf:name>
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    <dct:description>&lt;p&gt;Information on stellar inclinations are of prime importance to characterize the formation and dynamics of transiting exoplanetary&amp;nbsp;systems, by helping to constrain the angle between the stellar spin axis and the planetary&amp;nbsp;orbit axis, namely the&amp;nbsp;obliquity. As PLATO will observe about 150 000 main-sequence stars potentially hosting&amp;nbsp;exoplanets, it is crucial to have at hand a&amp;nbsp;fast, robust and automated method to measure the stellar inclination angle.&lt;br&gt; I will present the method I developed and the results I derived for almost 1200 red giant stars that have been&amp;nbsp;observed by the Kepler&amp;nbsp;space mission, which exhibit mixed modes offering the opportunity to obtain accurate measurements of the inclination angle&amp;nbsp;of the stellar rotation axis. I could characterize the biases affecting inclination&amp;nbsp;measurements, in particular for extreme values&amp;nbsp;close to 0 ◦ and 90 ◦ . This study allowed me to provide a way to infer&amp;nbsp;the underlying statistical distribution of inclinations for a&amp;nbsp;given sample of stars, free from observational limitations.&amp;nbsp;This method has the advantage to be able to derive&amp;nbsp;seismic&amp;nbsp;measurements of the&amp;nbsp;inclination angle for any solar-type&amp;nbsp;pulsator with identified oscillation modes.&lt;/p&gt;</dct:description>
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