Millimeter Observations of the disk around GW Ori

Abstract

The GW Ori system is a pre-main sequence triple system (GW Ori A/B/C) with companions (GW Ori B/C) at $\sim$1 AU and $\sim$8 AU, respectively, from the primary (GW Ori A). The primary of the system has a mass of 3.9 $M_{\odot }$, but shows a spectral type of G8. Thus, GW Ori A could be a precursor of a B star, but it is still at an earlier evolutionary stage than Herbig Be stars. GW Ori provides us an ideal target for experiments and observations (being a "blown-up" upscaled Solar System with a very massive "sun" and at least two "upscaled planets"). We present the first spatially-resolved millimeter interferometric observations of the disk around the triple pre-main-sequence system GW Ori, obtained with the the Submillimeter Array, both in continuum and in the ${}^{12}\mathrm{CO}J=2-1$, ${}^{13}\mathrm{CO}J=2-1$, and ${\mathrm{C}}^{18}\mathrm{O}J=2-1$ lines. These new data reveal a huge, massive, and bright disk in the GW Ori system. The dust continuum emission suggests a disk radius around 400 AU. But, the ${}^{12}\mathrm{CO}J=2-1$ emission shows much more extended disk with a size around 1300 AU. Due to the spatial resolution ($\sim$1$"$), we cannot detect the gap in the disk which is inferred from spectral energy distribution (SED) modeling. We characterize the dust and gas properties in the disk by comparing the observations with the predictions from the disk models with various parameters calculated with a Monte Carlo radiative transfer code RADMC-3D. The disk mass is around 0.12 $M_{\odot }$, and the disk inclination with respect to the line of sight is around $\sim$ 35${}^{\circ }$. The kinematics in the disk traced by the CO line emission strongly suggest that the circumstellar material in the disk is in Keplerian rotation around GW Ori. Tentatively substantial ${\mathrm{C}}^{18}\mathrm{O}$ depletion in gas phase is required to explain the characteristics of the line emission from the disk.

10 pages, 8 Figure, 3 tables, Accepted by A&A

References in corpus (26)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• A simple model for the evolution of the dust population in protoplanetary disks
• Protoplanetary Disk Structures in Ophiuchus
• Gas- and dust evolution in protoplanetary disks
• Resolved Images of Large Cavities in Protoplanetary Transition Disks
• The AKARI/IRC Mid-Infrared All-Sky Survey
• The Submillimeter Array
• The photodissociation and chemistry of CO isotopologues: applications to interstellar clouds and circumstellar disks
• Mapping the Shores of the Brown Dwarf Desert II: Multiple Star Formation in Taurus-Auriga
• The TW Hya Disk at 870 microns: Comparison of CO and Dust Radial Structures
• The Role of Multiplicity in Disk Evolution and Planet Formation
• Pre-main-sequence isochrones -- II. Revising star and planet formation timescales
• The tidally induced warping, precession and truncation of accretion discs in binary systems: three-dimensional simulations
• Young "Dipper" Stars in Upper Sco and $\rho$ Oph Observed by K2
• Primordial Circumstellar Disks in Binary Systems: Evidence for Reduced Lifetimes
• Millimeter imaging of HD 163296: probing the disk structure and kinematics
• The gas temperature in flaring disks around pre-main sequence stars
• A Multiplicity Census of Young Stars in Chamaeleon I
• A break in the gas and dust surface density of the disc around the T Tauri star IM Lup
• CO J=6-5 observations of TW Hya with the SMA
• Tracing the potential planet-forming regions around seven pre-main-sequence stars
• Dipper disks not inclined towards edge-on orbits
• GW Ori: Inner disk readjustments in a triple system
• The peculiar dipping events in the disk-bearing young-stellar object EPIC 204278916
• A "Rosetta Stone" for protoplanetary disks: The synergy of multi-wavelength observations
• First astronomical unit scale image of the GW Ori triple. Direct detection of a new stellar companion

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• Gemini-LIGHTS: Herbig Ae/Be and massive T-Tauri protoplanetary disks imaged with Gemini Planet Imager
• VLTI/MIDI atlas of disks around low- and intermediate-mass young stellar objects
• The Architecture of the GW Ori Young Triple Star System and Its Disk: Dynamical Masses, Mutual Inclinations, and Recurrent Eclipses
• GW Ori: circumtriple rings and planets
• CLIcK: a Continuum and Line fItting Kit for circumstellar disks
• Orbital Solution for the Spectroscopic Binary in the GW Ori Hierarchical Triple
• Disc breaking and parametric instability in warped accretion discs
• A Streamer Driving Misalignment in the Circumtriple Disk of GW Ori