Journal
SCIENCE
Volume 374, Issue 6565, Pages 330-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abg8794
Keywords
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Categories
Funding
- Fundacao para a Ciencia e Tecnologia (FCT)
- FEDER through COMPETE2020 -Programa Operacional Competitividade e Internacionalizacao [UID/FIS/04434/2019, UIDB/04434/2020, UIDP/04434/2020, PTDC/FIS-AST/32113/2017, POCI-01-0145-FEDER-032113, PTDC/FIS-AST/28953/2017, POCI-01-0145-FEDER-028953]
- FCT through Investigador FCT [IF/00650/2015/CP1273/CT0001, IF/00849/2015/CP1273/CT0003, IF/00169/2012/CP0150/CT0002, IF/00028/2014/CP1215/CT0002]
- POPH/FSE (EC)
- FEDER
- Programa Operacional de Factores de Competitividade COMPETE
- Swiss National Science Foundation (SNSF) [PZ00P2_174028]
- National Center for Competence in Research PlanetS
- SNSF [DL 57/2016/CP1364/CT0004, DL57/2016/CP1364/CT0005]
- FCT
- French National Research Agency (ANR) [ANR-18-CE310019 (SPlaSH)]
- European Research Council [757448-PAMDORA]
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The study explores the compositional link between rocky exoplanets and their host stars, finding a correlation but not a one-to-one relationship between the two. Additionally, super-Earths and super-Mercuries appear to be distinct populations with differing compositions, suggesting differences in their formation processes.
Stars and planets both form by accreting material from a surrounding disk. Because they grow from the same material, theory predicts that there should be a relationship between their compositions. In this study, we search for a compositional link between rocky exoplanets and their host stars. We estimate the iron-mass fraction of rocky exoplanets from their masses and radii and compare it with the compositions of their host stars, which we assume reflect the compositions of the protoplanetary disks. We find a correlation (but not a 1:1 relationship) between these two quantities, with a slope of >4, which we interpret as being attributable to planet formation processes. Super-Earths and super-Mercuries appear to be distinct populations with differing compositions, implying differences in their formation processes.
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