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Séminaire du Jeudi 10 septembre 2015

Searching for signatures of planet formation in stars with circumstellar debris discs

Jesus Maldonado (INAF, Palermo)
Thursday September 10th - 11am
IPAG Seminar Room - IPAG

Twenty years after the first exoplanet discoveries our understanding of what stellar properties influence (on how) planet formation is far to be complete. Excluding the well-established correlation between stellar metallicity and the probability that the star hosts a gas-giant planet, any other claim of a chemical trend in planet-hosting stars has been so far disputed. In the last years, detailed chemical abundance studies have reported different trends between samples of planet and non-planet hosts. In parallel, tentative correlations between the presence of dusty debris discs and low-mass planets have been presented. In this contribution we present the results of a homogeneous spectroscopy study of 251 stars including stars with known debris discs, with debris discs and planets, and only with planets. The [Fe/H] and <[X/Fe]>-Tc trends are discussed and set into the context of planet formation. The possible correlations between the <[X/Fe]>-Tc slopes and stellar properties such as metallicity or age are also discussed.

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Sous la tutelle de:

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Sous la tutelle de:

CNRS Université Grenoble Alpes