Theory predicts that we should find fast, ejected (runaway) stars of all masses around dense, young star-forming regions. $N$-body simulations show the number and distribution these could be used to constrain initial spatial kinematic substructure We search for runaway slower walkaway within 100 pc Orion Nebula Cluster (ONC) using $Gaia$ DR2 astrometry photometry. compare our findings predictions velocity distributions from run 4 Myr with conditions tailored ONC. In DR2, 31 54 candidates...

We use N-body simulations to probe the early phases of dynamical evolution star-forming regions and focus on mass velocity distributions unbound stars. In this parameter space study, we vary initial virial ratio degree spatial kinematic substructure analyse fraction stars that become in two different classes (above below 8 M|$\odot$|). find differs depending conditions. After 10 Myr, initially highly subvirial, substructured simulations, high-mass lower fractions are similar at ∼23 per cent....

We quantify the spatial distribution of stars for two subclusters centred around massive/intermediate mass S Mon and IRS1/2 in NGC2264 star-forming region. find that both are have neither a substructured, nor centrally concentrated according to Q-parameter. Neither subcluster displays segregation $\Lambda_{\rm MSR}$ ratio, but most massive higher relative surface densities $\Sigma_{\rm LDR}$ ratio. then compare these quantities results N-body simulations constrain initial conditions NGC2264,...

Abstract Short-lived radioisotopes, in particular 26 Al and 60 Fe, are thought to contribute the internal heating of Earth, but significantly more abundant solar system compared interstellar medium. The presence their decay products oldest objects argues for inclusion Sun’s protoplanetary disk almost immediately after star formation event that formed Sun. Various scenarios have been proposed delivery system, usually involving one or core-collapse supernovae massive stars. An alternative...

Fast, ejected stars have been found around several young star-forming regions, such as the Orion Nebula Cluster (ONC). These can be used to constrain initial density, spatial and kinematic substructure when compared predictions from $N$-body simulations. We search for runaway slower walkaway using $Gaia$ DR2 within 100 pc of NGC 2264, which contains subclustered regions higher-mass OB-stars (S Mon, IRS 1 2). find five runaways nine walkaways that trace back S Mon six 1/2 based on their...

ABSTRACT Stars do not form in isolation but together with other stars, and often a clustered environment. Depending on the initial conditions these environments, such as density substructure, distances of encounters between stars will differ. These can also affect just-formed exoplanetary systems. Using N-body simulations, we show effect single fly-by common type system: close-in super-Earths/sub-Neptunes or without distant giant planet. Even encounter significantly modify architecture...

Stars do not form in isolation but together with other stars, and often a clustered environment. Depending on the initial conditions these environments, such as density substructure, distances of encounters between stars will differ. These can also affect just-formed exoplanetary systems. Using N-body simulations, we show effect single fly-by common type system: close-in Super-Earths/sub-Neptunes or without distant Giant planet. Even encounter significantly modify architecture systems over...

Planetary systems appear to form contemporaneously around young stars within star-forming regions. Within these environments, the chances of survival, as well long-term evolution systems, are influenced by factors such dynamical interactions with other and photoevaporation from massive stars. These can also cause be ejected their birth regions become runaways. We present examples runaway in vicinity Orion Nebula Cluster (ONC) found Gaia DR2 data that have retained discs during ejection...

Short-lived radioisotopes, in particular 26-Al and 60-Fe, are thought to contribute the internal heating of Earth, but significantly more abundant Solar System compared Interstellar Medium. The presence their decay products oldest objects argues for inclusion Sun's protoplanetary disc almost immediately after star formation event that formed Sun. Various scenarios have been proposed delivery System, usually involving one or core-collapse supernovae massive stars. An alternative scenario...