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Kepler-36: A Pair of Planets with Neighboring Orbits and Dissimilar Densities

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arxiv 1206.4718 v1 pith:QVXTQAYW submitted 2012-06-20 astro-ph.EP

Joshua A. Carter , Eric Agol , William J. Chaplin , Sarbani Basu , Timothy R. Bedding , Lars A. Buchhave , J{o}rgen Christensen-Dalsgaard , Katherine M. Deck
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Yvonne Elsworth Daniel C. Fabrycky Eric B. Ford Jonathan J. Fortney Steven J. Hale Rasmus Handberg Saskia Hekker Matthew J. Holman Daniel Huber Christopher Karoff Steven D. Kawaler Hans Kjeldsen Jack J. Lissauer Eric D. Lopez Mikkel N. Lund Mia Lundkvist Travis S. Metcalfe Andrea Miglio Leslie A. Rogers Dennis Stello William J. Borucki Steve Bryson Jessie L. Christiansen William D. Cochran John C. Geary Ronald L. Gilliland Michael R. Haas Jennifer Hall Andrew W. Howard Jon M. Jenkins Todd Klaus David G. Koch David W. Latham Phillip J. MacQueen Dimitar Sasselov Jason H. Steffen Joseph D. Twicken Joshua N. Winn
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keywords planetsorbitsdensitiesdifferingorbitalotherpairpattern
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In the Solar system the planets' compositions vary with orbital distance, with rocky planets in close orbits and lower-density gas giants in wider orbits. The detection of close-in giant planets around other stars was the first clue that this pattern is not universal, and that planets' orbits can change substantially after their formation. Here we report another violation of the orbit-composition pattern: two planets orbiting the same star with orbital distances differing by only 10%, and densities differing by a factor of 8. One planet is likely a rocky `super-Earth', whereas the other is more akin to Neptune. These planets are thirty times more closely spaced--and have a larger density contrast--than any adjacent pair of planets in the Solar system.

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  1. Recurrence Network Analysis of Exoplanetary Observables

    astro-ph.EP 2019-08 conditional novelty 5.0 of 10

    Recurrence network measures from RV and TTV time series can separate regular from chaotic exoplanet dynamics, with Kepler-36b flagged as irregular.

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