Mapping CO Gas in the GG Tauri A Triple System with 50 AU Spatial Resolution

Abstract

We aim to unveil the observational imprint of physical mechanisms that govern planetary formation in the young, multiple system GG Tau A. We present ALMA observations of ${}^{12}$CO and ${}^{13}$CO 3-2 and 0.9 mm continuum emission with 0.35" resolution. The ${}^{12}$CO 3-2 emission, found within the cavity of the circumternary dust ring (at radius $<180$ AU) where no ${}^{13}$CO emission is detected, confirms the presence of CO gas near the circumstellar disk of GG Tau Aa. The outer disk and the recently detected hot spot lying at the outer edge of the dust ring are mapped both in ${}^{12}$CO and ${}^{13}$CO. The gas emission in the outer disk can be radially decomposed as a series of slightly overlapping Gaussian rings, suggesting the presence of unresolved gaps or dips. The dip closest to the disk center lies at a radius very close to the hot spot location at $\sim 250-260$~AU. The CO excitation conditions indicate that the outer disk remains in the shadow of the ring. The hot spot probably results from local heating processes. The two latter points reinforce the hypothesis that the hot spot is created by an embedded proto-planet shepherding the outer disk.

8 pages, 4 figures. Accepted by ApJ

References in corpus (8)

• First Results from High Angular Resolution ALMA Observations Toward the HL Tau Region
• The Transiting Circumbinary Planets Kepler-34 and Kepler-35
• Planet formation signposts: observability of circumplanetary disks via gas kinematics
• Gas and dust structures in protoplanetary disks hosting multiple planets
• Resolved images of the protoplanetary disk around HD 100546 with ALMA
• GG Tau: the fifth element
• Resolved Multifrequency Radio Observations of GG Tau
• Near-Infrared Polarimetry of the GG Tauri A Binary System

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• Gap, shadows, spirals, streamers: SPHERE observations of binary-disk interactions in GG Tau A
• First detection of H${}_2$S in a protoplanetary disk. The dense GG Tau A ring
• Protoplanetary disk masses in NGC 2024: Evidence for two populations
• On The Secular Evolution of GG Tau A Circumbinary Disc: A Msialigned Disc Scenario
• GG Tau A: gas properties and dynamics from the cavity to the outer disk
• Testing dust trapping in the circumbinary disk around GG Tau A
• Near-Infrared Imaging Polarimetry of Inner Region of GG Tau A Disk
• Determining the physical conditions of extremely young Class 0 circumbinary disk around VLA1623A
• Circumbinary Disks of the Protostellar Binary Systems in the L1551 Region
• An unbiased NOEMA 2.6 to 4 mm survey of the GG Tau ring: First detection of CCS in a protoplanetary disk
• Orbital dynamics in the GG Tau A system: investigating its enigmatic disc
• On the frequencies of circumbinary discs in protostellar systems
• ALMA Observations of Asymmetric Molecular Gas Emission from a Protoplanetary Disk in the Orion Nebula
• On the cavity size in circumbinary discs
• Morphology of the ${}^{13}$CO(3-2) millimeter emission across the gas disc surrounding the triple protostar GG Tau A using ALMA observations