Poster Open Access

# Similarity of multi-planetary systems

Jon F. Otegi; François Bouchy; Ravit Helled

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<identifier identifierType="DOI">10.5281/zenodo.5561371</identifier>
<creators>
<creator>
<creatorName>Jon F. Otegi</creatorName>
<affiliation>Universities of Geneva &amp; Zurich</affiliation>
</creator>
<creator>
<creatorName>François Bouchy</creatorName>
<affiliation>University of Geneva</affiliation>
</creator>
<creator>
<creatorName>Ravit Helled</creatorName>
<affiliation>University of Zurich</affiliation>
</creator>
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<titles>
<title>Similarity of multi-planetary systems</title>
</titles>
<publisher>Zenodo</publisher>
<publicationYear>2021</publicationYear>
<dates>
<date dateType="Issued">2021-10-11</date>
</dates>
<resourceType resourceTypeGeneral="Text">Poster</resourceType>
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<alternateIdentifier alternateIdentifierType="url">https://zenodo.org/record/5561371</alternateIdentifier>
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<relatedIdentifier relatedIdentifierType="DOI" relationType="IsVersionOf">10.5281/zenodo.5561370</relatedIdentifier>
<relatedIdentifier relatedIdentifierType="URL" relationType="IsPartOf">https://zenodo.org/communities/plato2021</relatedIdentifier>
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<rightsList>
<rights rightsURI="https://creativecommons.org/licenses/by/4.0/legalcode">Creative Commons Attribution 4.0 International</rights>
<rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
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<descriptions>
<description descriptionType="Abstract">&lt;p&gt;Previous studies using Kepler data suggest that planets orbiting the same star tend to have similar sizes. However, due to the faintness of the stars, only a few of the planets were also detected with radial velocity follow-ups, and therefore the planetary masses were mostly unknown. It therefore yet to be determined whether planetary systems indeed behave as &amp;quot;peas in a pod&amp;quot;.&amp;nbsp;&lt;br&gt;
&amp;nbsp;Follow-up programs of TESS targets significantly increased the number of confirmed planets with mass measurements, allowing for a more detailed statistical analysis of multi-planet systems. In this work we explore the similarity in radii, masses, densities, and period ratios of planets within planetary systems.&amp;nbsp;&lt;br&gt;
&amp;nbsp;We &amp;nbsp;show that planets in the same system that are similar in radii could be rather different in mass and vice versa. Nevertheless, planets are somewhat &amp;nbsp;similar in mass up to masses of ~100Me and radii of ~10Re. We find that in general, the planetary radii of a given planetary system are more similar than the masses. &amp;nbsp;We conclude that other quantities like the density may be crucial to fully understand the nature of planetary systems and that, due to the diversity of planets within a planetary system, increasing the number of detected systems is crucial for understanding the exoplanetary demographics.&amp;nbsp;&lt;/p&gt;</description>
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