SIMBAD references

2018MNRAS.479.4786V - Mon. Not. R. Astron. Soc., 479, 4786-4795 (2018/October-0)

An asteroseismic view of the radius valley: stripped cores, not born rocky.

VAN EYLEN V., AGENTOFT C., LUNDKVIST M.S., KJELDSEN H., OWEN J.E., FULTON B.J., PETIGURA E. and SNELLEN I.

Abstract (from CDS):

Various theoretical models treating the effect of stellar irradiation on planetary envelopes predict the presence of a radius valley, i.e. a bimodal distribution of planet radii, with super-Earths and sub-Neptune planets separated by a valley at around ~2 R. Such a valley has been observed recently, owing to an improvement in the precision of stellar and therefore planetary radii. Here, we investigate the presence, location, and shape of such a valley using a small sample with highly accurate stellar parameters determined from asteroseismology, which includes 117 planets with a median uncertainty on the radius of 3.3 per cent. We detect a clear bimodal distribution, with super-Earths (~1.5 R) and sub-Neptunes (≃2.5 R) separated by a deficiency around 2 R. We furthermore characterize the slope of the valley as a power law R∝Pγ with γ= -0.09+0.02–0.04. A negative slope is consistent with models of photoevaporation, but not with the late formation of rocky planets in a gas-poor environment, which would lead to a slope of opposite sign. The exact location of the gap further points to planet cores consisting of a significant fraction of rocky material.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): planets and satellites: composition - planets and satellites: formation - planets and satellites: fundamental parameters - planets and satellites: physical evolution

Simbad objects: 117

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2021.07.29-00:42:30

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