A Close-up View of the Young Circumbinary Disk HD 142527

Boehler, Y.; Weaver, E.; Isella, A.; Ricci, L.; Grady, C.; Carpenter, J.; Perez, L.

doi:10.3847/1538-4357/AA696C

Title: A Close-up View of the Young Circumbinary Disk HD 142527

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Abstract

We present ALMA observations of the 0.88 millimeter dust continuum and the {sup 13}CO and C{sup 18}O J = 3-2 line emission of the circumbinary disk HD 142527 at a spatial resolution of ∼0.″25. This system is characterized by a large central cavity of roughly 120 au in radius, and asymmetric dust and gas emission. By comparing the observations with theoretical models, we find that the azimuthal variations in gas and dust density reach a contrast of 54 for dust grains and 3.75 for CO molecules, with an extreme gas-to-dust ratio of 1.7 on the dust crescent. We point out that caution is required in interpreting continuum-subtracted maps of the line emission, as this process might result in removing a large fraction of the line emission. Radially, we find that both the gas and dust surface densities can be described by Gaussians, centered at the same disk radius, and with gas profiles wider than those for dust. These results strongly support a scenario in which millimeter dust grains are radially and azimuthally trapped toward the center of a gas pressure bump. Finally, our observations reveal a compact source of continuum and CO emission inside the dust-depleted cavity ∼50 au frommore »« less

Authors:

Boehler, Y.; Weaver, E.; Isella, A.; Ricci, L. ^[1]; Grady, C. ^[2]; Carpenter, J. ^[3]; Perez, L. ^[4]

Rice University, Department of Physics and Astronomy, Main Street, Houston, TX 77005 (United States)
Exoplanets and Stellar Astrophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
Joint ALMA Observatory (JAO), Alonso de Cordova 3107 Vitacura—Santiago de Chile (Chile)
Max-Planck-Institute for Astronomy, Bonn (Germany)

Publication Date:: Mon May 01 00:00:00 EDT 2017

OSTI Identifier:: 22663645

Resource Type:: Journal Article

Journal Name:: Astrophysical Journal

Additional Journal Information:: Journal Volume: 840; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASYMMETRY; CARBON; CARBON MONOXIDE; COMPACTS; COMPARATIVE EVALUATIONS; DENSITY; DUSTS; EMISSION; INTERACTIONS; MOLECULES; OXYGEN 18; PROTOPLANETS; ROTATION; SPATIAL RESOLUTION; STARS; SURFACES

Citation Formats


                    Boehler, Y., Weaver, E., Isella, A., Ricci, L., Grady, C., Carpenter, J., and Perez, L. A Close-up View of the Young Circumbinary Disk HD 142527.  United States: N. p., 2017. 
        Web.  doi:10.3847/1538-4357/AA696C.

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                    Boehler, Y., Weaver, E., Isella, A., Ricci, L., Grady, C., Carpenter, J., & Perez, L. A Close-up View of the Young Circumbinary Disk HD 142527.  United States.  https://doi.org/10.3847/1538-4357/AA696C

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                    Boehler, Y., Weaver, E., Isella, A., Ricci, L., Grady, C., Carpenter, J., and Perez, L. 2017.  
        "A Close-up View of the Young Circumbinary Disk HD 142527".  United States.  https://doi.org/10.3847/1538-4357/AA696C.

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@article{osti_22663645,

  title        = {A Close-up View of the Young Circumbinary Disk HD 142527},

  author       = {Boehler, Y. and Weaver, E. and Isella, A. and Ricci, L. and Grady, C. and Carpenter, J. and Perez, L.},

  abstractNote = {We present ALMA observations of the 0.88 millimeter dust continuum and the {sup 13}CO and C{sup 18}O J = 3-2 line emission of the circumbinary disk HD 142527 at a spatial resolution of ∼0.″25. This system is characterized by a large central cavity of roughly 120 au in radius, and asymmetric dust and gas emission. By comparing the observations with theoretical models, we find that the azimuthal variations in gas and dust density reach a contrast of 54 for dust grains and 3.75 for CO molecules, with an extreme gas-to-dust ratio of 1.7 on the dust crescent. We point out that caution is required in interpreting continuum-subtracted maps of the line emission, as this process might result in removing a large fraction of the line emission. Radially, we find that both the gas and dust surface densities can be described by Gaussians, centered at the same disk radius, and with gas profiles wider than those for dust. These results strongly support a scenario in which millimeter dust grains are radially and azimuthally trapped toward the center of a gas pressure bump. Finally, our observations reveal a compact source of continuum and CO emission inside the dust-depleted cavity ∼50 au from the primary star. The kinematics of the CO emission from this region is different from that expected from material in Keplerian rotation around the binary system, and might instead trace a compact disk around a third companion. Higher angular resolution observations are required to investigate the nature of this source.},

  doi          = {10.3847/1538-4357/AA696C},

  url          = {https://www.osti.gov/biblio/22663645},
  journal      = {Astrophysical Journal},

  issn         = {0004-637X},

  number       = 1,

  volume       = 840,

  place        = {United States},

  year         = {Mon May 01 00:00:00 EDT 2017},

  month        = {Mon May 01 00:00:00 EDT 2017}

}

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