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2014•The Astronomical JournalOpen access

SMA SUBMILLIMETER OBSERVATIONS OF HL Tau: REVEALING A COMPACT MOLECULAR OUTFLOW

Alba M. Lumbreras, Luis A. Zapata

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Abstract

We present archival high angular resolution (∼2'') 12 CO(3–2) line and continuum submillimeter observations of the young stellar object HL Tau made with the Submillimeter Array. The 12 CO(3–2) line observations reveal the presence of a compact and wide opening angle bipolar outflow with a northeast to southwest orientation (P.A. = 50°) that is associated with the optical and infrared jet emanating from HL Tau with a similar orientation. On the other hand, the 850 μm continuum emission observations exhibit a strong and compact source in the position of HL Tau that has a spatial size of ∼200 × 70 AU with a P.A. = 145° and a dust mass of around 0.1 M ☉ . These physical parameters are in agreement with values obtained recently from millimeter observations. This submillimeter source is therefore related to the disk surrounding HL Tau.

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We present archival high angular resolution (∼2'') 12 CO(3–2) line and continuum submillimeter observations of the young stellar object HL Tau made with the Submillimeter Array. The 12 CO(3–2) line observations reveal the presence of a compact and wide opening angle bipolar outflow with a northeast to southwest orientation (P.A. = 50°) that is associated with the optical and infrared jet emanating from HL Tau with a similar orientation. On the other hand, the 850 μm continuum emission observations exhibit a strong and compact source in the position of HL Tau that has a spatial size of ∼200 × 70 AU with a P.A. = 145° and a dust mass of around 0.1 M ☉ . These physical parameters are in agreement with values obtained recently from millimeter observations. This submillimeter source is therefore related to the disk surrounding HL Tau.

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Available abstract

We present archival high angular resolution (∼2'') 12 CO(3–2) line and continuum submillimeter observations of the young stellar object HL Tau made with the Submillimeter Array. The 12 CO(3–2) line observations reveal the presence of a compact and wide opening angle bipolar outflow with a northeast to southwest orientation (P.A. = 50°) that is associated with the optical and infrared jet emanating from HL Tau with a similar orientation. On the other hand, the 850 μm continuum emission observations exhibit a strong and compact source in the position of HL Tau that has a spatial size of ∼200 × 70 AU with a P.A. = 145° and a dust mass of around 0.1 M ☉ . These physical parameters are in agreement with values obtained recently from millimeter observations. This submillimeter source is therefore related to the disk surrounding HL Tau.

Key concepts: Submillimeter Array, Millimeter, Physics, Bipolar outflow, Outflow, Infrared, Astrophysics, Young stellar object

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