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A resonant sextuplet of sub-Neptunes transiting the bright star HD 110067
Stockholm University, Faculty of Science, Department of Astronomy.ORCID iD: 0000-0002-7201-7536
Stockholm University, Faculty of Science, Department of Astronomy.ORCID iD: 0000-0003-3747-7120
Number of Authors: 1522023 (English)In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 623, no 7989, p. 932-937Article in journal (Refereed) Published
Abstract [en]

Planets with radii between that of the Earth and Neptune (hereafter referred to as 'sub-Neptunes') are found in close-in orbits around more than half of all Sun-like stars. However, their composition, formation and evolution remain poorly understood3. The study of multiplanetary systems offers an opportunity to investigate the outcomes of planet formation and evolution while controlling for initial conditions and environment. Those in resonance (with their orbital periods related by a ratio of small integers) are particularly valuable because they imply a system architecture practically unchanged since its birth. Here we present the observations of six transiting planets around the bright nearby star HD 110067. We find that the planets follow a chain of resonant orbits. A dynamical study of the innermost planet triplet allowed the prediction and later confirmation of the orbits of the rest of the planets in the system. The six planets are found to be sub-Neptunes with radii ranging from 1.94R⊕ to 2.85R⊕. Three of the planets have measured masses, yielding low bulk densities that suggest the presence of large hydrogen-dominated atmospheres.

Place, publisher, year, edition, pages
2023. Vol. 623, no 7989, p. 932-937
National Category
Astronomy, Astrophysics and Cosmology
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URN: urn:nbn:se:su:diva-227977DOI: 10.1038/s41586-023-06692-3ISI: 001169044100007PubMedID: 38030780Scopus ID: 2-s2.0-85178181432OAI: oai:DiVA.org:su-227977DiVA, id: diva2:1849097
Available from: 2024-04-05 Created: 2024-04-05 Last updated: 2024-04-05Bibliographically approved

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Brandeker, AlexisOlofsson, Göran

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