High Angular Resolution Radio Observations of the HL/XZ Tau Region: Mapping the 50 AU Protoplanetary Disk around HL Tau and Resolving XZ Tau S into a 13 AU Binary

Abstract

We present new 7 mm and archive 1.3 cm high angular resolution observations of the HL/XZ Tau region made with the VLA. At 7 mm, the emission from HL Tau seems to be arising in a clumpy disk with radius of order 25 AU. The 1.3 cm emission from XZ Tau shows the emission from a binary system with 0"3 (42 AU) separation, known from previous optical/IR observations. However, at 7 mm, the southern radio component resolves into a binary with 0"09 (13 AU) separation, suggesting that XZ Tau is actually a triple star system. We suggest that the remarkable ejection of gas from the XZ Tau system observed with the HST may be related to a periastron passage of this newly discovered close binary system.

Accepted by The Astrophysical Journal Letters (23 Jan 2009)

References in corpus (5)

• Circumstellar and Circumbinary Disks in Eccentric Stellar Binaries
• Proper Motions of the Jets in the Region of HH 30 and HL/XZ Tau. Evidence for a Binary Exciting Source of the HH 30 Jet
• A Multi-Epoch HST Study of the Herbig-Haro Flow from XZ Tauri
• Enhanced Dust Emission in the HL Tau Disc: A Low-Mass Companion in Formation?
• A Single Circumstellar Disk in the SVS 13 Close Binary System

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• Time-dependent models of the structure and evolution of self-gravitating protoplanetary discs
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• Gas Gaps in the Protoplanetary Disk around the Young Protostar HL Tau
• 13C17O suggests gravitational instability in the HL Tau disc
• The properties of the inner disk around HL Tau: Multi-wavelength modeling of the dust emission
• A 1.3 mm SMA Survey of 29 Variable Young Stellar Objects
• The Physical Properties of the SVS 13 Protobinary System: Two Circumstellar Disks and a Spiraling Circumbinary Disk in the Making
• Time Variability of Emission Lines for Four Active T Tauri Stars (I): October--December in 2010
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• SMA Submillimeter Observations of HL Tau: Revealing a compact molecular outflow
• The Winds from HL Tau
• Self-consistent modelling of the dust component in protoplanetary and circumplanetary disks: the case of PDS 70
• A Dwarf Protoplanetary Disk around XZ Tau B
• Physical and Chemical Conditions of the Protostellar Envelope and the Protoplanetary Disk in HL Tau
• The immediate environment of the Class 0 protostar VLA1623, on scales of ~50-100 AU, observed at millimetre and centimetre wavelengths
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• Dust Grain Evolution in Spatially Resolved T Tauri Binaries
• Multi-epoch, high spatial resolution observations of multiple T Tauri systems
• Gap formation by inclined massive planets in locally isothermal three-dimensional discs
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• Orbital motions and light curves of young binaries XZ Tau and VY Tau
• Triple trouble for XZ Tau: deep imaging with the Jansky Very Large Array
• A GMRT survey of regions towards the Taurus Molecular Cloud at 323 and 608 MHz
• Misaligned Circumstellar Disks and Orbital Motion of the Young Binary XZ Tau