17-21 March 2019
Sunstar Hotel, Grindelwald, Switzerland
Europe/Zurich timezone

A fundamental test of planet formation: searching for low-mass planets around metal-poor stars

21 Mar 2019, 10:15
Sunstar Hotel, Grindelwald, Switzerland

Sunstar Hotel, Grindelwald, Switzerland

Dorfstrasse 168, 3818 Grindelwald Switzerland
Oral Others Other


João Faria (Institute of Astrophysics and Space Sciences)


As the number of known super-Earths and Neptune-like planets keeps growing, the properties and frequency of such systems start to be revealed. Planet formation models suggest that these low-mass planets, unlike giant planets, should be frequent around stars with low metallicities. But this theoretical prediction still needs to be observationally confirmed.
I will present the analysis of a decade-long radial-velocity survey of metal-poor stars with the HARPS spectrograph. In this survey, we find a significantly lower frequency of low-mass planets, when compared with results for stars with solar metallicity. These results challenge the predictions of the standard core-accretion theory, strengthening the idea that planets with lower masses which form in metal-poor disks may not migrate far before the disk dissipates, ending up at larger orbital periods and thus being still undetectable.

Primary author

João Faria (Institute of Astrophysics and Space Sciences)


Dr Nuno Santos (IA/U. Porto) Dr Pedro Figueira (ESO and IA/U. Porto)

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