External photoevaporation of protoplanetary discs in Cygnus OB2: linking discs to star formation dynamical history

Abstract

Many stars form in regions of enhanced stellar density, wherein the influence of stellar neighbours can have a strong influence on a protoplanetary disc (PPD) population. In particular, far ultraviolet (FUV) flux from massive stars drives thermal winds from the outer edge of PPDs, accelerating disc destruction. In this work, we present a novel technique for constraining the dynamical history of a star forming environment using PPD properties in a strongly FUV irradiated environment. Applying recent models for FUV induced mass loss rates to the PPD population of Cygnus OB2, we constrain how long ago primordial gas was expelled from the region; $0.5$ Myr ago if the Shakura & Sunyaev $\alpha$-viscosity parameter is $\alpha =10^{-2}$ (corresponding to a viscous timescale of ${\tau }_{\mathrm{visc}}\approx 0.5$ Myr for a disc of scale radius $40$ au around a $1M_{\odot }$ star). This value of $\alpha$ is effectively an upper limit, since it assumes efficient extinction of FUV photons throughout the embedded phase. With this gas expulsion timescale we are able to produce a full dynamical model that fits kinematic and morphological data as well as disc fractions. We suggest Cygnus OB2 was originally composed of distinct massive clumps or filaments, each with a stellar mass $\sim 10^4{M}_{\odot }$. Finally we predict that in regions of efficient FUV induced mass loss, disc mass $M_{\mathrm{disc}}$ as a function of stellar host mass $m_{\mathrm{star}}$ follows a power law with $M_{\mathrm{disc}}\propto m_{\mathrm{star}}^{\beta }$, where $\beta \gtrsim 2.7$ (depending on disc initial conditions and FUV exposure). This is steeper than observed correlations in regions of moderate FUV flux ($1<\beta <1.9$), and offers a promising diagnostic to establish the influence of external photoevaporation in a given region.

arXiv comment20 pages, 17 figures, accepted by MNRAS

References in corpus (72)

• On the variation of the Initial Mass Function
• Embedded Clusters in Molecular Clouds
• Disk Frequencies and Lifetimes in Young Clusters
• Some Aspects of Measurement Error in Linear Regression of Astronomical Data
• Protoplanetary Disks and Their Evolution
• Streaming Instabilities in Protoplanetary Disks
• Circumstellar Dust Disks in Taurus-Auriga: The Submillimeter Perspective
• Clouds, filaments and protostars: the Herschel Hi-GAL Milky Way
• The Mass Dependence Between Protoplanetary Disks and their Stellar Hosts
• ALMA Survey of Lupus Protoplanetary Disks I: Dust and Gas Masses
• The Birth Environment of the Solar System
• A Steeper than Linear Disk Mass-Stellar Mass Scaling Relation
• On the fraction of star formation occurring in bound stellar clusters
• A comprehensive set of simulations studying the influence of gas expulsion on star cluster evolution
• Star Formation Efficiencies and Lifetimes of Giant Molecular Clouds in the Milky Way
• An ALMA Survey of Protoplanetary Disks in the $\sigma$ Orionis Cluster
• On the diversity and statistical properties of protostellar discs
• A dual-frequency sub-arcsecond study of proto-planetary disks at mm wavelengths: First evidence for radial variations of the dust properties
• Protoplanetary disk lifetimes vs stellar mass and possible implications for giant planet populations
• Episodic accretion at early stages of evolution of low mass stars and brown dwarfs: a solution for the observed luminosity spread in HR diagrams?
• Before the first supernova: combined effects of HII regions and winds on molecular clouds
• NBODY6++GPU: Ready for the gravitational million-body problem
• Destruction of protoplanetary disks in the Orion Nebula Cluster
• The dynamical evolution of fractal star clusters: the survival of substructure
• Unveiling the gas and dust disk structure in HD 163296 using ALMA observations
• A Study of Cyg OB2: Pointing the Way Towards Finding Our Galaxy's Super Star Clusters
• The Coupled Physical Structure of Gas and Dust in the IM Lup Protoplanetary Disk
• The Photoevaporation of Discs Around Young Stars in Massive Clusters
• Protoplanetary disc truncation mechanisms in stellar clusters: comparing external photoevaporation and tidal encounters
• Gravitational fragmentation and the formation of brown dwarfs in stellar clusters
• Kinematics of the Orion Nebula Cluster: Velocity Substructure and Spectroscopic Binaries
• The Massive Star Population of Cygnus OB2
• Protoplanetary Disk Properties in the Orion Nebula Cluster: Initial Results from Deep, High-Resolution ALMA Observations
• Flybys in protoplanetary discs: I. Gas and dust dynamics
• External photoevaporation of protoplanetary discs in sparse stellar groups: the impact of dust growth
• Testing the theory of grain growth and fragmentation by millimeter observations of protoplanetary disks
• Constraints on Massive Star Formation: Cygnus OB2 was always an Association
• Ionizing feedback from massive stars in massive clusters: Fake bubbles and untriggered star formation
• A Radial Velocity Survey of the Cygnus OB2 Association
• The FRIED grid of mass loss rates for externally irradiated protoplanetary discs
• UV Radiation Fields Produced by Young Embedded Star Clusters
• The Massive Star Forming Region Cygnus OB2. II. Integrated Stellar Properties and the Star Formation History
• Correlation between the spatial distribution of the circumstellar disks and the massive stars in the open cluster NGC 6611. Compiled catalog and cluster parameters
• Viscous Evolution and Photoevaporation of Circumstellar Disks due to External FUV Radiation Fields
• Cygnus OB2 DANCe: A high precision proper motion study of the Cygnus OB2 association
• A Tale of Three Cities: OmegaCAM discovers multiple sequences in the color-magnitude diagram of the Orion Nebula Cluster
• The effect of the dynamical state of clusters on gas expulsion and infant mortality
• Sizes of protoplanetary discs after star-disc encounters
• Proplyds around a B1 star - 42 Orionis in NGC 1977
• First evidence of external disc photoevaporation in a low mass star forming region: the case of IM Lup
• Not all stars form in clusters - measuring the kinematics of OB associations with $Gaia$
• Stellar Kinematics of Young Clusters in Turbulent Hydrodynamic Simulations
• The expansion of massive young star clusters - observation meets theory
• Constraining proto-planetary disc evolution using accretion rate and disc mass measurements: the usefulness of the dimensionless accretion parameter
• CHANDRA/VLA Follow-up of TeV J2032+4131, the Only Unidentified TeV Gamma-ray Source
• Parameter Study of Star-Discs Encounters
• Early-A stars from IPHAS, and their distribution in and around the Cyg OB2 association
• Evidence for feedback and stellar-dynamically regulated bursty star cluster formation: the case of the Orion Nebula Cluster
• Protoplanetary Disc Response to Distant Tidal Encounters in Stellar Clusters
• GMC Collisions as Triggers of Star Formation. I. Parameter Space Exploration with 2D Simulations
• Evidence of a past disc-disc encounter: HV and DO Tau
• Photoevaporation and close encounters: how the environment around Cygnus OB2 affects the evolution of protoplanetary disks
• Close Stellar Encounters in Young, Substructured, Dissolving Star Clusters: Statistics and Effects on Planetary Systems
• How do disks and planetary systems in high-mass open clusters differ from those around field stars?
• Modelling massive-star feedback with Monte Carlo radiation hydrodynamics: photoionization and radiation pressure in a turbulent cloud
• Predicting Gaia's Parallax Distance to the Cygnus OB2 Association with Eclipsing Binaries
• The protoplanetary disks in the nearby massive star forming region Cygnus OB2
• Optical photometric GTC/OSIRIS observations of the young massive association Cygnus OB2
• Kinematics and Structure of Star-forming Regions: Insights from Cold Collapse Models
• The Inception of Star Cluster Formation Revealed by [CII] Emission Around an Infrared Dark Cloud
• The viscous evolution of circumstellar discs in young star clusters
• The physical and chemical structure of Sagittarius B2. III. Radiative transfer simulations of the hot core SgrB2(M) for methyl cyanide

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