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- W3204163922 abstract "The planets within compact multi-planet systems tend to have similar sizes, masses, and orbital period ratios, like peas in a pod. This pattern was detected when considering planets with radii between 1 and 4 $R_oplus$. However, these same planets show a bimodal radius distribution, with few planets between 1.5 and 2 $R_{oplus}$. The smaller are consistent with being stripped rocky cores, while the larger likely have gaseous H/He envelopes. Given these distinct structures, it is worthwhile to test for intra-system uniformity separately within each category of planets. Here, we find that the tendency for intra-system uniformity is twice as strong when considering planets within the same size category than it is when combining all planets together. The sub-Neptunes tend to be $1.7^{+0.6}_{-0.3}$ times larger than the super-Earths in the same system, corresponding to an envelope mass fraction of about 2.6% for a $5,M_{oplus}$ planet. For the sub-Neptunes, the low-metallicity stars are found to have planets with more equal sizes, with modest statistical significance ($psim 0.005$). There is also a modest $(sim$2-$sigma)$ tendency for wider-orbiting planets to be larger, even within the same size category." @default.
- W3204163922 created "2021-10-11" @default.
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- W3204163922 date "2021-10-04" @default.
- W3204163922 modified "2023-09-27" @default.
- W3204163922 title "Split Peas in a Pod: Intra-System Uniformity of Super-Earths and Sub-Neptunes." @default.
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- W3204163922 hasPublicationYear "2021" @default.
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