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Flows of gas through a protoplanetary gap.

Simon Casassus1, Gerrit van der Plas, M Sebastian Perez

  • 1Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile. scasassus@u.uchile.cl

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|January 4, 2013
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Summary

Observations reveal gas flowing through a gap in the protoplanetary disk of young star HD 142527, indicating planet formation is actively feeding stellar accretion. This gas flow is crucial for sustaining the star

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Area of Science:

  • Astronomy and Astrophysics
  • Planetary Science

Background:

  • Planet formation models predict gaps in protoplanetary disks.
  • The young star HD 142527 exhibits an inner disk, a large gap, and a disrupted outer disk.

Purpose of the Study:

  • To investigate the gas dynamics within the gap of the HD 142527 protoplanetary disk.
  • To determine if gas flow can sustain the observed high stellar accretion rate.

Main Methods:

  • Infrared observations to map disk structure.
  • Radio observations to analyze molecular gas composition and distribution.
  • Analysis of diffuse CO and dense HCO+ gas within the gap.

Main Results:

  • Diffuse CO gas detected inside the gap.
  • Denser HCO+ gas observed along gap-crossing filaments.
  • Estimated gas flow rate of 7x10^-9 to 2x10^-7 solar masses per year.

Conclusions:

  • The observed gas flow is sufficient to maintain the star's high accretion rate.
  • Protoplanetary bodies likely channel gas from the outer to inner disk.
  • This provides evidence for ongoing planet formation influencing stellar activity.