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Planet formation in action: resolved gas and dust images of a transitional disk and its cavity

Published online by Cambridge University Press:  06 January 2014

Nienke van der Marel ,
Ewine F. van Dishoeck ,
Simon Bruderer ,
Til Birnstiel ,
Paola Pinilla ,
Cornelis P. Dullemond ,
Tim A. van Kempen ,
Markus Schmalzl ,
Joanna M. Brown  and
Gregory J. Herczeg
...Show all authors
Nienke van der Marel
Affiliation:
Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands
Ewine F. van Dishoeck
Affiliation:
Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands Max-Planck-Institut f{ü}r Extraterrestrische Physik Giessenbachstrasse 1, 85748 Garching, Germany
Simon Bruderer
Affiliation:
Max-Planck-Institut f{ü}r Extraterrestrische Physik Giessenbachstrasse 1, 85748 Garching, Germany
Til Birnstiel
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
Paola Pinilla
Affiliation:
Heidelberg University, Center for Astronomy, Institute for Theoretical Astrophysics, Albert Ueberle Str. 2, 69120, Heidelberg, Germany
Cornelis P. Dullemond
Affiliation:
Heidelberg University, Center for Astronomy, Institute for Theoretical Astrophysics, Albert Ueberle Str. 2, 69120, Heidelberg, Germany
Tim A. van Kempen
Affiliation:
Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands Joint ALMA Offices, Av. Alonso de Cordova, Santiago, Chile
Markus Schmalzl
Affiliation:
Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands
Joanna M. Brown
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
Gregory J. Herczeg
Affiliation:
Kavli Institute for Astronomy and Astrophysics, Peking University, Yi He Yuan Lu 5, Hai Dian Qu, 100871 Beijing, PR China
Geoffrey S. Mathews
Affiliation:
Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands
Vincent Geers
Affiliation:
Dublin Institute for Advanced Studies, 31 Fitzwilliam Place, Dublin 2, Ireland
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Abstract

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Planet formation and clearing of protoplanetary disks is one of the long standing problems in disk evolution theory. The best test of clearing scenarios is observing systems that are most likely to be actively forming planets: the transitional disks with large inner dust cavities. We present the first results of our ALMA (Atacama Large Millimeter/submillimeter Array) Cycle 0 program using Band 9, imaging the Herbig Ae star Oph IRS 48 in CO 6−5 and the submillimeter continuum in the extended configuration. The resulting ~0.2″ spatial resolution completely resolves the cavity of this disk in the gas and the dust. The gas cavity of IRS 48 is half as large as the dust cavity, ruling out grain growth and photoevaporation as the primary cause of the truncation. On the other hand, the continuum emission reveals an unexpected large azimuthal asymmetry and steep edges in the dust distribution along the ring, suggestive of dust trapping. We will discuss the implications of the combined gas and dust distribution for planet formation at a very early stage. This is one of the first transition disks with spatially resolved gas inside the cavity, demonstrating the superb capabilities of the Band 9 receivers.

Keywords

planetary systems: formationplanetary systems: protoplanetary disks
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S299: Exploring the Formation and Evolution of Planetary Systems , June 2013 , pp. 90 - 93
Copyright
Copyright © International Astronomical Union 2013 

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