Journal
SCIENCE
Volume 337, Issue 6094, Pages 556-559Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1223269
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Categories
Funding
- NASA's Science Mission Directorate
- NASA [HF-51267.01-A, HF-51272.01-A, NAS 5-26555]
- Space Telescope Science Institute
- NSF [AST-0645416]
- Center for Astrophysics
- UK Science and Technology Facilities Council (STFC)
- Danish National Research Foundation
- ASTERISK project (ASTERoseismic Investigations with SONG and Kepler)
- European Research Council [267864]
- Netherlands Organization for Scientific Research (NWO)
- NASA Kepler Participating Scientist program [NNX12AC76G]
- Science and Technology Facilities Council [ST/J001163/1] Funding Source: researchfish
- STFC [ST/J001163/1] Funding Source: UKRI
- NASA [52422, NNX12AC76G] Funding Source: Federal RePORTER
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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 20 times more closely spaced and have a larger density contrast than any adjacent pair of planets in the solar system.
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