ALMA 690 GHz observations of IRAS 16293-2422B: infall in a highly optically-thick disk

Zapata, Luis A., Loinard, Laurent, Rodriguez, Luis F., Hernandez-Hernandez, Vicente, Takahashi, Satoko, Trejo, Alfonso and Parise, Berengere 2013. ALMA 690 GHz observations of IRAS 16293-2422B: infall in a highly optically-thick disk. Astrophysical Journal Letters 764 (1) , L14. 10.1088/2041-8205/764/1/L14

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Abstract

We present sensitive, high angular resolution (~0.''2) submillimeter continuum and line observations of IRAS 16293–2422B made with the Atacama Large Millimeter/Submillimeter Array. The 0.45 mm continuum observations reveal a single and very compact source associated with IRAS 16293–2422B. This submillimeter source has a deconvolved angular size of about 400 mas (50 AU) and does not show any inner structure inside of this diameter. The H13CN, HC15N, and CH3OH line emission regions are about twice as large as the continuum emission and reveal a pronounced inner depression or "hole" with a size comparable to that estimated for the submillimeter continuum. We suggest that the presence of this inner depression and the fact that we do not see an inner structure (or a flat structure) in the continuum are produced by very optically thick dust located in the innermost parts of IRAS 16293–2422B. All three lines also show pronounced inverse P-Cygni profiles with infall and dispersion velocities larger than those recently reported from observations at lower frequencies, suggesting that we are detecting faster and more turbulent gas located closer to the central object. Finally, we report a small east-west velocity gradient in IRAS 16293–2422B that suggests that its disk plane is likely located very close to the plane of the sky.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	ISM: individual objects (IRAS 16293, 2422); ISM: jets and outflows; stars: pre-main sequence; techniques: spectroscopic
Publisher:	Institute of Physics
ISSN:	2041-8205
Last Modified:	19 Mar 2016 09:40
URI:	https://orca.cardiff.ac.uk/id/eprint/52765

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