Discovery of a Third Transiting Planet in the Kepler-47 Circumbinary System
| Autor: | Guillermo Torres, Eric Agol, Daniel Jontof-Hutter, Eric B. Ford, William F. Welsh, Michael Endl, Nader Haghighipour, Gur Windmiller, Billy Quarles, Sean M. Mills, Tobias W. A. Müller, Daniel C. Fabrycky, Tobias C. Hinse, William D. Cochran, Jack J. Lissauer, Donald R. Short, Jerome A. Orosz, Suman Satyal, Tsevi Mazeh |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Earth and Planetary Astrophysics (astro-ph.EP) Outer planets 010504 meteorology & atmospheric sciences Astronomy FOS: Physical sciences Astronomy and Astrophysics Radius Orbital period Protoplanetary disk 01 natural sciences Kepler-47 Orbit Space and Planetary Science Planet 0103 physical sciences Circumbinary planet 010303 astronomy & astrophysics Astrophysics - Earth and Planetary Astrophysics 0105 earth and related environmental sciences |
| DOI: | 10.48550/arxiv.1904.07255 |
| Popis: | Of the nine confirmed transiting circumbinary planet systems, only Kepler-47 is known to contain more than one planet. Kepler-47 b (the "inner planet") has an orbital period of 49.5 days and a radius of about $3\,R_{\oplus}$. Kepler-47 c (the "outer planet") has an orbital period of 303.2 days and a radius of about $4.7\,R_{\oplus}$. Here we report the discovery of a third planet, Kepler-47 d (the "middle planet"), which has an orbital period of 187.4 days and a radius of about $7\,R_{\oplus}$. The presence of the middle planet allows us to place much better constraints on the masses of all three planets, where the $1\sigma$ ranges are less than $26\,M_{\oplus}$, between $7-43\,M_{\oplus}$, and between $2-5\,M_{\oplus}$ for the inner, middle, and outer planets, respectively. The middle and outer planets have low bulk densities, with $\rho_{\rm middle} < 0.68$ g cm$^{-3}$ and $\rho_{\rm outer} < 0.26$ g cm$^{-3}$ at the $1\sigma$ level. The two outer planets are "tightly packed," assuming the nominal masses, meaning no other planet could stably orbit between them. All of the orbits have low eccentricities and are nearly coplanar, disfavoring violent scattering scenarios and suggesting gentle migration in the protoplanetary disk. Comment: 68 pages, 30 figures |
| Databáze: | OpenAIRE |
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