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Flows of gas through a protoplanetary gap

Cassius, Simon and van der Plas, Gerrit and Perez, M. Sebastian and Dent, William R. F. and Fomalont, Ed and Hagelberg, Janis and Hales, Antonio and Jordán, Andrés and Mawet, Dimitri and Ménard, François and Wootten, Al and Wilner, David J. and Hughes, A. Meredith and Schreiber, Matthias R. and Girard, Julien H. and Ercolano, Barbara and Canovas, Hector and Román, Pablo E. and Salinas, Vachail (2013) Flows of gas through a protoplanetary gap. Nature, 493 (7431). pp. 191-194. ISSN 0028-0836.

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The formation of gaseous giant planets is thought to occur in the first few million years after stellar birth. Models predict that the process produces a deep gap in the dust component (shallower in the gas). Infrared observations of the disk around the young star HD 142527 (at a distance of about 140 parsecs from Earth) found an inner disk about 10 astronomical units (au) in radius (1 au is the Earth–Sun distance), surrounded by a particularly large gap and a disrupted outer disk beyond 140 au. This disruption is indicative of a perturbing planetary-mass body at about 90 au. Radio observations indicate that the bulk mass is molecular and lies in the outer disk, whose continuum emission has a horseshoe morphology. The high stellar accretion rate would deplete the inner disk in less than one year, and to sustain the observed accretion matter must therefore flow from the outer disk and cross the gap. In dynamical models, the putative protoplanets channel outer-disk material into gap-crossing bridges that feed stellar accretion through the inner disk. Here we report observations of diffuse CO gas inside the gap, with denser HCO+ gas along gap-crossing filaments. The estimated flow rate of the gas is in the range of 7 × 10^(−9) to 2 × 10^(−7) solar masses per year, which is sufficient to maintain accretion onto the star at the present rate.

Item Type:Article
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URLURL TypeDescription ReadCube access
van der Plas, Gerrit0000-0001-5688-187X
Hagelberg, Janis0000-0002-1096-1433
Mawet, Dimitri0000-0002-8895-4735
Wilner, David J.0000-0003-1526-7587
Girard, Julien H.0000-0001-8627-0404
Canovas, Hector0000-0001-7668-8022
Additional Information:© 2013 Macmillan Publishers Limited. Received 12 August; accepted 31 October 2012; published online 2 January; corrected online 9 January 2013. This paper makes use of the following ALMA data: ADS/ JAO.ALMA#2011.0.00465.S. ALMA is a partnership of the ESO, NSF, NINS, NRC, NSC and ASIAA. The Joint ALMA Observatory is operated by the ESO, AUI/NRAO and NAOJ. This work was also based on observations obtained at the Gemini Observatory. Financial support was provided by Millennium NucleusP10-022-F (Chilean Ministry of Economy) and additionally by grant FONDECYT 1100221 and grant 284405 from the European Union FP7 programme.
Funding AgencyGrant Number
Chilean Ministry of EconomyUNSPECIFIED
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1100221
European Union FP7 programmeUNSPECIFIED
Subject Keywords:Interstellar medium; Stars
Issue or Number:7431
Record Number:CaltechAUTHORS:20150526-162525769
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Official Citation:Casassus, S., van der Plas, G., M, S. P., Dent, W. R. F., Fomalont, E., Hagelberg, J., . . . Salinas, V. (2013). Flows of gas through a protoplanetary gap. [10.1038/nature11769]. Nature, 493(7431), 191-194.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57833
Deposited On:28 May 2015 20:55
Last Modified:09 Mar 2020 13:19

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