Radial distribution of distant trans-Neptunian objects points to Sun's formation in a stellar cluster

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F23%3A10476490" target="_blank" >RIV/00216208:11320/23:10476490 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Sc.jasKvpx" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Sc.jasKvpx</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.icarus.2023.115738" target="_blank" >10.1016/j.icarus.2023.115738</a>

Result language
angličtina
Original language name
Radial distribution of distant trans-Neptunian objects points to Sun's formation in a stellar cluster
Original language description
The Scattered Disk Objects (SDOs) are a population of trans-Neptunian bodies with semimajor axes 50 < a less than or similar to 1000 au and perihelion distances q greater than or similar to 30 au. The detached SDOs with orbits beyond the reach of Neptune (roughly q > 35 au) are of special interest here as an important constraint on the early evolution of the outer Solar System. The semimajor axis profile of detached SDOs at 50-500 au, as characterized from the Dark Energy Survey (DES), is radially extended, but previous dynamical models of Neptune's early migration produce a relatively compact profile. This problem is most likely related to Sun's birth environment in a stellar cluster. We perform new dynamical simulations that account for cluster effects and show that the orbital distribution of SDOs can be explained if a particularly close stellar encounter occurred early on (e.g., M dwarf with the mass similar or equal to 0.2 M-circle dot approaching the Sun at similar or equal to 200 au). For such an encounter to happen with a reasonably high probability the Sun must have formed in a stellar cluster with eta T greater than or similar to 10(4) Myr pc(-3,) where eta is the stellar number density and T is the Sun's residence time in the cluster.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)

Project
<a href="/en/project/GA21-11058S" target="_blank" >GA21-11058S: Orbital and chemical evolution of emerging planetary systems</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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