ALMA and VLA Observations of EX Lupi in its Quiescent State
arXiv:2009.14216 · doi:10.3847/1538-4357/abbb94
Abstract
Extreme outbursts in young stars may be a common stage of pre-main-sequence stellar evolution. These outbursts, caused by enhanced accretion and accompanied by increased luminosity, can also strongly impact the evolution of the circumstellar environment. We present ALMA and VLA observations of EX Lupi, a prototypical outburst system, at 100 GHz, 45 GHz, and 15 GHz. We use these data, along with archival ALMA 232 GHz data, to fit radiative transfer models to EX Lupi's circumstellar disk in its quiescent state following the extreme outburst in 2008. The best fit models show a compact disk with a characteristic dust radius of 45 au and a total mass of 0.01 M. Our modeling suggests grain growth to sizes of at least 3 mm in the disk, possibly spurred by the recent outburst, and an ice line that has migrated inward to au post-outburst. At 15 GHz, we detected significant emission over the expected thermal disk emission which we attribute primarily to stellar (gyro)synchrotron and free-free disk emission. Altogether, these results highlight what may be a common impact of outbursts on the circumstellar dust.
arXiv commentAccepted to ApJ, 15 pages, 8 figures
References in corpus (44)
- Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
- First Results from High Angular Resolution ALMA Observations Toward the HL Tau Region
- The Disk Substructures at High Angular Resolution Project (DSHARP): I. Motivation, Sample, Calibration, and Overview
- Protoplanetary Disk Structures in Ophiuchus
- ALMA Survey of Lupus Protoplanetary Disks I: Dust and Gas Masses
- The Magnetic Fields of Classical T Tauri Stars
- Consistent dust and gas models for protoplanetary disks. I. Disk shape, dust settling, opacities, and PAHs
- Evidence of fast pebble growth near condensation fronts in the HL Tau protoplanetary disk
- Modeling optical properties of cosmic dust grains using a distribution of hollow spheres
- Non-steady Accretion in Protostars
- Imaging the water-snow line during a protostellar outburst
- On the Location of the Snow Line in a Protoplanetary Disk
- Variable protostellar accretion with episodic bursts
- Accretion Discs Trapped Near Corotation
- Episodic formation of cometary material in the outburst of a solar-like young star
- Planetesimal formation around the snow line in MRI-driven turbulent protoplanetary disks
- Cooling Requirements for the Vertical Shear Instability in Protoplanetary Disks
- Challenges in Planet Formation
- Hipparcos distances of Ophiuchus and Lupus cloud complexes
- Direct magnetic field detection in the innermost regions of an accretion disc
- Radiation Hydrodynamical Turbulence In Protoplanetary Disks: Numerical Models and Observational Constraints
- Kinematic links and the co-evolution of MHD winds, jets, and inner disks from a high-resolution optical [OI] survey
- Trends in Ultracool Dwarf Magnetism. I. X-Ray Suppression and Radio Enhancement
- X-Shooter spectroscopy of young stellar objects in Lupus. Atmospheric parameters, membership and activity diagnostics
- Resolving the Planetesimal Belt of HR 8799 with ALMA
- Ex Lupi from Quiescence to Outburst: Exploring the LTE Approach in Modelling Blended H2O and OH Mid-Infrared Emission
- The ALMA early science view of FUor/EXor objects - V: continuum disc masses and sizes
- Free-free Emission and Radio Recombination Lines from Photoevaporating Disks
- Exoplanet-induced radio emission from M-dwarfs
- Flickering in FU Orionis
- EX Lupi in quiescence
- Optical spectroscopy of EX Lupi during quiescence and outburst: Infall, wind, and dynamics in the accretion flow
- Chemical Signatures of the FU Ori Outbursts
- The chemistry of episodic accretion in embedded objects. 2D radiation thermo-chemical models of the post-burst phase
- Near-infrared spectroscopy of EX Lupi in outburst
- First Magnetic Field Detection on a Class I Protostar
- EXor outbursts from disk amplification of stellar magnetic cycles
- 1.3 mm ALMA Observations of the Fomalhaut Debris System
- The Circumstellar Disk and Asymmetric outflow of the EX Lup Outburst System
- Spectral evolution and radial dust transport in the prototype young eruptive system EX Lup
- A few days before the end of the 2008 extreme outburst of EX Lup : accretion shocks and a smothered stellar corona unveiled by XMM-Newton
- APEX Observations of the CO Envelope around the Young FUor-type Star V883 Ori
- Constraining the Radio Emission of TRAPPIST-1
- Simulations of Small Solid Accretion onto Planetesimals in the Presence of Gas