Constraining the initial conditions of NGC 2264 using ejected stars found in Gaia DR2

Abstract

Fast, ejected stars have been found around several young star-forming regions, such as the Orion Nebula Cluster (ONC). These ejected stars can be used to constrain the initial density, spatial and kinematic substructure when compared to predictions from $N$-body simulations. We search for runaway and slower walkaway stars using $Gaia$ DR2 within 100 pc of NGC 2264, which contains subclustered regions around higher-mass OB-stars (S Mon, IRS 1 and IRS 2). We find five runaways and nine walkaways that trace back to S Mon and six runaways and five walkaways that trace back to IRS 1/2 based on their 3D-kinematics. We compare these numbers to a range of $N$-body simulations with different initial conditions. The number of runaways/walkaways is consistent with initial conditions with a high initial stellar density ($\sim$10 000 M${}_{\odot }$ pc${}^{-3}$), a high initial amount of spatial substructure and either a subvirial or virialised ratio for all subclusters. We also confirm the trajectories of our ejected stars using the data from $Gaia$ EDR3, which reduces the number of runaways from IRS 1/2 from six to four but leaves the number of runaways from S Mon unchanged. The reduction in runaways is due to smaller uncertainties in the proper motion and changes in the parallax/distance estimate for these stars in $Gaia$ EDR3. We find further runaway/walkaway candidates based on proper motion alone in $Gaia$ DR2, which could increase these numbers once radial velocities are available. We also expect further changes in the candidate list with upcoming $Gaia$ data releases.

arXiv comment21 pages, 6 figures, accepted for publication in MNRAS

References in corpus (135)

• Gaia Data Release 2. Summary of the contents and survey properties
• The Gaia mission
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• Embedded Clusters in Molecular Clouds
• The SIMBAD astronomical database
• Binary interaction dominates the evolution of massive stars
• Gaia Data Release 2: The astrometric solution
• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• Local Kinematics and the Local Standard of Rest
• Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
• The VizieR database of Astronomical Catalogues
• Stellar Multiplicity
• The Revised TESS Input Catalog and Candidate Target List
• New catalogue of optically visible open clusters and candidates
• Gaia Data Release 2: Photometric content and validation
• A Gaia DR2 view of the Open Cluster population in the Milky Way
• Astrophysical parameters of Galactic open clusters
• The VLT-FLAMES Tarantula Survey VIII. Multiplicity properties of the O-type star population
• Gaia Data Release 2: first stellar parameters from Apsis
• The Galactic disk mass-budget : I. stellar mass-function and density
• Star cluster ecology IVa: Dissection of an open star cluster---photometry
• On the origin of the O and B-type stars with high velocities II Runaway stars and pulsars ejected from the nearby young stellar groups
• The incidence of stellar mergers and mass gainers among massive stars
• Inverse Dynamical Population Synthesis and Star Formation
• Kinematics in Young Star Clusters and Associations with Gaia DR2
• The VAST Survey - III. The multiplicity of A-type stars within 75 pc
• The Spatial Distribution of Star Formation in the Solar Neighbourhood: Do all stars form in clusters?
• The initial mass function : from Salpeter 1955 to 2005
• Clusters and mirages: cataloguing stellar aggregates in the Milky Way
• A catalogue of young runaway Hipparcos stars within 3kpc from the Sun
• Early Evolution of Stellar Groups and Clusters: Environmental Effects on Forming Planetary Systems
• Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18
• Runaway stars as progenitors of supernovae and gamma-ray bursts
• The Origin of Massive O-type Field Stars. Part II: Field O stars as runaways
• The Distance to NGC 2264
• Using the minimum spanning tree to trace mass segregation
• Inverse dynamical population synthesis: Constraining the initial conditions of young stellar clusters by studying their binary populations
• The VAST Survey -- II. Orbital motion monitoring of A-type star multiples
• Kinematic and Spatial Substructure in NGC 2264
• On the metallicity of open clusters. III. Homogenised sample
• The dynamical evolution of fractal star clusters: the survival of substructure
• A dynamical origin for early mass segregation in young star clusters
• The early dynamical evolution of cool, clumpy star clusters
• A rotational and variability study of a large sample of PMS stars in NGC 2264
• A Spitzer census of the IC 348 nebula
• Dynamical evolution of star forming regions
• Probing the formation of intermediate- to high-mass stars in protoclusters: A detailed millimeter study of the NGC 2264 clumps
• The Updated Multiple Star Catalog
• Mapping accretion and its variability in the young open cluster NGC 2264: a study based on u-band photometry
• A reanalysis of the Gaia Data Release 2 photometric sensitivity curves using HST/STIS spectrophotometry
• Dynamical ejections of massive stars from young star clusters under diverse initial conditions
• The Kinematics of the Scorpius-Centaurus OB Association from Gaia DR1
• 3D mapping of young stars in the solar neighbourhood with Gaia DR2
• Binary Stars in the Orion Nebula Cluster
• On the function describing the stellar initial mass function
• Visual Binaries in the Orion Nebula Cluster
• Fitting the young main-sequence; distances, ages and age spreads
• Binaries Like to be Twins: Implications for Doubly Degenerate Binaries, the Supernova Ia Rate and Other Interacting Binaries
• A Correlation Between Pre-Main Sequence Stellar Rotation Rates and IRAC Excesses in Orion
• Close companions around young stars
• On the metallicity of open clusters II. Spectroscopy
• Identifying Primordial Substructure in NGC 2264
• A Spitzer View of the Young Open Cluster NGC 2264
• The effects of dynamical interactions on planets in young substructured star clusters
• The VLT-FLAMES Tarantula Survey III: A very massive star in apparent isolation from the massive cluster R136
• Planetary dynamics in stellar clusters
• Testing the Disk Regulation Paradigm with Spitzer Observations. II. A Clear Signature of Star-Disk Interaction in NGC 2264 and the Orion Nebula Cluster
• CSI 2264: Investigating rotation and its connection with disk accretion in the young open cluster NGC 2264
• Are pre-main-sequence stars older than we thought?
• Gaia DR2 in 6D: Searching for the fastest stars in the Galaxy
• Age Gradients in the Stellar Populations of Massive Star Forming Regions Based on a New Stellar Chronometer
• Kinematics of NGC 2264: signs of cluster formation
• Revisiting hypervelocity stars after Gaia DR2
• The Gaia-ESO Survey: the present-day radial metallicity distribution of the Galactic disc probed by pre-main-sequence clusters
• Revised Gaia Data Release 2 passbands
• Binary Formation Mechanisms: Constraints from the Companion Mass Ratio Distribution
• UV variability and accretion dynamics in the young open cluster NGC 2264
• Probing the formation of intermediate- to high-mass stars in protoclusters II. Comparison between millimeter interferometric observations of NGC 2264-C and SPH simulations of a collapsing clump
• Double or binary: on the multiplicity of open star clusters
• Unlocking Galactic Wolf-Rayet stars with $\text{Gaia}$ DR2 I: Distances and absolute magnitudes
• Gaia and the Galactic Center Origin of Hypervelocity Stars
• The Universality of the Companion Mass Ratio Distribution
• The Gaia-ESO Survey: a new approach to chemically characterising young open clusters
• A catalogue of stellar diameters and fluxes for mid-infrared interferometry
• Does sub-cluster merging accelerate mass segregation in local star formation?
• Runaway and walkaway stars from the ONC with Gaia DR2
• Cluster dynamics largely shapes protoplanetary disc sizes
• Dynamics versus structure: breaking the density degeneracy in star formation
• Spitzer observations of NGC2264: The nature of the disk population
• Spectroscopic binaries with components of similar mass
• Binaries in the field: fossils of the star formation process?
• The Gaia-ESO Survey and CSI 2264: Substructures, disks, and sequential star formation in the young open cluster NGC 2264
• Hypervelocity stars in the Gaia era: Runaway B stars beyond the velocity limit of classical ejection mechanisms
• Rapid destruction of protoplanetary discs due to externalphotoevaporation in star-forming regions
• The substructure and halo population of the Double Cluster $h$ and $\chi$ Persei
• Is stellar multiplicity universal? Tight stellar binaries in the Orion Nebula Cluster
• Gaia DR2 reveals a very massive runaway star ejected from R136
• 591 high velocity stars in the Galactic halo selected from LAMOST DR7 and Gaia DR2
• The binary companion mass ratio distribution: an imprint of the star formation process?
• Dynamical evolution of star forming regions - II. Basic kinematics
• New Brown Dwarf Companions to Young Stars in Scorpius-Centaurus
• Anatomy of the hyper-runaway star LP 40-365 with Gaia
• The dynamical fate of binary star clusters in the Galactic tidal field
• Nearby high-speed stars in Gaia DR2
• Gaia Stellar Kinematics in the Head of the Orion A Cloud: Runaway Stellar Groups and Gravitational Infall
• Limits on initial mass segregation in young clusters
• A Spitzer View of Mon OB1 East/NGC 2264
• The initial period function of late-type binary stars and its variation
• Stellar Proper Motions in the Orion Nebula Cluster
• The Villafranca catalog of Galactic OB groups: I. Systems with O2-O3.5 stars
• The Distance and the near-IR extinction of the Monoceros Supernova Remnant
• Spectroscopic Binaries in the Orion Nebula Cluster and NGC 2264
• The Gaia-ESO Survey: Stellar radii in the young open clusters NGC 2264, NGC 2547 and NGC 2516
• The Gaia-ESO Survey: Membership probabilities for stars in 32 open clusters from 3D kinematics
• Massive stars in the hinterland of the young cluster, Westerlund 2
• Runaway Young Stars in the Orion Nebula
• Gaia DR2 distances to Collinder 419 and NGC 2264 and new astrometric orbits for HD 193 322 Aa,Ab and 15 Mon Aa,Ab
• Dynamical evolution of star-forming regions: III. Unbound stars and predictions for Gaia
• Hunting for Runaways from the Orion Nebula Cluster
• The Structural Evolution of Forming and Early Stage Star Clusters
• Spatial Distribution and Kinematics of OB Stars
• Star Cluster Formation from Turbulent Clumps. II. Gradual Star Cluster Formation
• How do binary clusters form?
• The Spatial Evolution of Young Massive Clusters II. Looking for Imprints of Star Formation in NGC 2264 with Gaia DR2
• Multi-colour photometry and Gaia EDR3 astrometry of two couples of binary clusters (NGC 5617 and Trumpler 22) and (NGC 3293 and NGC 3324)
• Constraints on star formation in NGC2264
• A comprehensive study of young B stars in NGC 2264: I. Space photometry and asteroseismology
• Proper motions of OB stars in the far Carina Arm
• Variability survey in the CoRoT SRa01 field: Implications of eclipsing binary distribution on cluster formation in NGC 2264
• HST astrometry in the Orion Nebula Cluster: census of low-mass runaways
• The early dynamical evolution of star clusters near the Galactic Centre
• Enlarging habitable zones around binary stars in hostile environments
• Double trouble: Gaia reveals (proto)-planetary systems that may experience more than one dense star-forming environment
• Identification of young nearby runaway stars based on Gaia data and the lithium test
• LP 543-25: a rare low-mass runaway disk star

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