Oort cloud perturbations as a source of hyperbolic Earth impactors
Peña-Asensio, Eloy (Universitat Autònoma de Barcelona. Departament de Química)
Visuri, Jaakko (Ursa Astronomical Association)
Trigo Rodríguez, Josep Maria (Institut de Ciències de l'Espai)
Socas-Navarro, Hector (Universidad de La Laguna. Departamento de Astrofísica)
Gritsevich, Maria (University of Helsinki)
Siljama, Markku (Ursa Astronomical Association)
Rimola, Albert (Universitat Autònoma de Barcelona. Departament de Química)

Data:	2024
Resum:	The observation of interstellar objects 1I/'Oumuamua and 2I/Borisov suggests the existence of a larger population of smaller projectiles that impact our planet with unbound orbits. We analyze an asteroidal grazing meteor (FH1) recorded by the Finnish Fireball Network on October 23, 2022. FH1 displayed a likely hyperbolic orbit lying on the ecliptic plane with an estimated velocity excess of ∼0. 7 km s at impact. FH1 may either be an interstellar object, indicating a high-strength bias in this population, or an Oort cloud object, which would reinforce migration-based solar system models. Furthermore, under the calculated uncertainties, FH1 could potentially be associated with the passage of Scholz's binary star system. Statistical evaluation of uncertainties in the CNEOS database and study of its hyperbolic fireballs reveals an anisotropic geocentric radiant distribution and low orbital inclinations, challenging the assumption of a randomly incoming interstellar population. Orbital integrations suggest that the event on March 9, 2017 (IM2) from CNEOS may have experienced gravitational perturbation during the Scholz fly-by, contingent upon velocity overestimation within the expected range. These findings suggest that apparent interstellar meteors may, in fact, be the result of accelerated meteoroid impacts caused by close encounters with massive objects within or passing through our solar system.
Ajuts:	European Commission 865657 Agencia Estatal de Investigación PID2021-128062NB-I00 Agencia Estatal de Investigación CEX2020-001058-M Agencia Estatal de Investigación PID2021-126427NB-I00 Agencia Estatal de Investigación PID2020-120464GB-I100
Nota:	Altres ajuts: acords transformatius de la UAB
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Meteorites ; Meteors ; Meteoroids ; Comets ; Oort cloud ; Minor planets ; Asteroids ; Interstellar
Publicat a:	Icarus, Vol. 408 (January 2024) , art. 115844, ISSN 1090-2643

DOI: 10.1016/j.icarus.2023.115844

15 p, 2.9 MB

El registre apareix a les col·leccions:
Articles > Articles de recerca
Articles > Articles publicats