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• W2765226415 abstract "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 |${approx } 2, text{R}_oplus$|⁠. 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 (⁠|${approx } 1.5, text{R}_oplus$|⁠) and sub-Neptunes (≈2.5 R⊕) separated by a deficiency around |$2, text{R}_oplus$|⁠. We furthermore characterize the slope of the valley as a power law R∝Pγ with |$gamma = {-0.09^{+0.02}_{-0.04}}$|⁠. 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." @default.
• W2765226415 created "2017-11-10" @default.
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• W2765226415 date "2018-07-06" @default.
• W2765226415 modified "2023-10-11" @default.
• W2765226415 title "An asteroseismic view of the radius valley: stripped cores, not born rocky" @default.
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• W2765226415 doi "https://doi.org/10.1093/mnras/sty1783" @default.
• W2765226415 hasPublicationYear "2018" @default.
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