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Title: On the Dust Signatures Induced by Eccentric Super-Earths in Protoplanetary Disks

Abstract

In this work, we investigate the impact of a highly eccentric 10 M (where M is the Earth mass) planet embedded in a dusty protoplanetary disk on dust dynamics and its observational implications. By carrying out high-resolution 2D gas and dust two-fluid hydrodynamical simulations, we find that the planet's orbit can be circularized at large radii. After the planet's orbit is circularized, partial gap opening and dust ring formation happen close to the planet's circularization radius, which can explain the observed gaps/rings at the outer region of disks. When the disk mass and viscosity become low, we find that an eccentric planet can even open gaps and produce dust rings close to the pericenter and apocenter radii before its circularization. This offers alternative scenarios for explaining the observed dust rings and gaps in protoplanetary disks. A lower disk viscosity is favored to produce brighter rings in observations. An eccentric planet can also potentially slow down the dust radial drift in the outer region of the disk when the disk viscosity is low ( α 2 × 10 –4) and the circularization is faster than the dust radial drift.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of California, Santa Cruz, CA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); National Aeronautic and Space Administration (NASA)
OSTI Identifier:
1601411
Report Number(s):
[LA-UR-19-27695]
[Journal ID: ISSN 1538-4357]
Grant/Contract Number:  
[89233218CNA000001]
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
[Journal Name: The Astrophysical Journal (Online); Journal Volume: 886; Journal Issue: 1]; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Accretion; Protoplanetary disks; Exoplanets; Exoplanet dynamics; Dust continuum emission

Citation Formats

Li, Ya-Ping, Li, Hui, Li, Shengtai, and Lin, Douglas N. C. On the Dust Signatures Induced by Eccentric Super-Earths in Protoplanetary Disks. United States: N. p., 2019. Web. doi:10.3847/1538-4357/ab4bc8.
Li, Ya-Ping, Li, Hui, Li, Shengtai, & Lin, Douglas N. C. On the Dust Signatures Induced by Eccentric Super-Earths in Protoplanetary Disks. United States. doi:10.3847/1538-4357/ab4bc8.
Li, Ya-Ping, Li, Hui, Li, Shengtai, and Lin, Douglas N. C. Wed . "On the Dust Signatures Induced by Eccentric Super-Earths in Protoplanetary Disks". United States. doi:10.3847/1538-4357/ab4bc8.
@article{osti_1601411,
title = {On the Dust Signatures Induced by Eccentric Super-Earths in Protoplanetary Disks},
author = {Li, Ya-Ping and Li, Hui and Li, Shengtai and Lin, Douglas N. C.},
abstractNote = {In this work, we investigate the impact of a highly eccentric 10 M⊕ (where M⊕ is the Earth mass) planet embedded in a dusty protoplanetary disk on dust dynamics and its observational implications. By carrying out high-resolution 2D gas and dust two-fluid hydrodynamical simulations, we find that the planet's orbit can be circularized at large radii. After the planet's orbit is circularized, partial gap opening and dust ring formation happen close to the planet's circularization radius, which can explain the observed gaps/rings at the outer region of disks. When the disk mass and viscosity become low, we find that an eccentric planet can even open gaps and produce dust rings close to the pericenter and apocenter radii before its circularization. This offers alternative scenarios for explaining the observed dust rings and gaps in protoplanetary disks. A lower disk viscosity is favored to produce brighter rings in observations. An eccentric planet can also potentially slow down the dust radial drift in the outer region of the disk when the disk viscosity is low (α 2 × 10–4) and the circularization is faster than the dust radial drift.},
doi = {10.3847/1538-4357/ab4bc8},
journal = {The Astrophysical Journal (Online)},
number = [1],
volume = [886],
place = {United States},
year = {2019},
month = {11}
}

Journal Article:
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