About 30% of Sun-like Stars Have Kepler-like Planetary Systems: A Study of Their Intrinsic Architecture
作者： Jiwei Xie , Yanqin Wu , Cristobal Petrovich , Wei Zhu , Subo Dong
关键词: Solar System 、 Stars 、 Kepler 、 Astrophysics 、 Transit (astronomy) 、 Star (game theory) 、 Planet 、 Physics 、 Planetary system 、 Multiplicity (mathematics)
摘要: We constrain the intrinsic architecture of Kepler planetary systems by modeling observed multiplicities transiting planets (tranets) and their transit timing variations (TTVs). robustly determine that fraction Sun-like stars with Kepler-like planets, $\eta_{\rm Kepler}$, is $30\pm3\%$. Here are have radii $R_{\rm p} \gtrsim R_\oplus$ orbital periods $P<400$~days. Our result thus significantly revises previous claims more than 50\% such planets. Combining average number per star ($\sim0.9$), we obtain on each system has $3.0\pm0.3$ within 400 days. also find dispersion in inclinations a given system, $\sigma_{i,k}$, steep function its $k$. This can be parameterized as $\sigma_{i,k}\propto k^\alpha$ $-4<\alpha<-2$ at 2-$\sigma$ level. Such distribution well describes both tranets TTVs no excess single tranets. Therefore do not evidence supporting so-called "Kepler dichotomy." Together study eccentricities, now consistent picture: fewer hotter it dynamically. discuss briefly possible scenarios lead to trend. Despite our Solar belonging club, interesting notice three days inclination similar same multiplicity.
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