scholarly journals Long‐Term Collisional Evolution of Debris Disks

2008 ◽  
Vol 673 (2) ◽  
pp. 1123-1137 ◽  
Author(s):  
Torsten Lohne ◽  
Alexander V. Krivov ◽  
Jens Rodmann
Keyword(s):  
Debris Disks ◽  
Collisional Evolution

Resonant multi-lane patterns in circumbinary young debris disks

2018 ◽  
Vol 14 (S345) ◽  
pp. 230-231
Author(s):  
Tatiana V. Demidova ◽  
Ivan I. Shevchenko
Keyword(s):  
Debris Disks ◽  
Planetary Orbits

AbstractFormation of resonant multi-lane patterns in circumbinary young debris disks with planets is considered in a set of representative massively simulated models. We find that the long term-stable resonant patterns are generically formed, shepherded by embedded planets. The patterns are multi-lane, i.e., they consist of several concentric rings. Statistical dependences of their parameters on the planetary parameters are recovered. Relevant additional massive simulations of planetesimal disks in systems with parameters of Kepler-16, 34, and 35 are accomplished and described. We find that co-orbital patterns generically form in systems with moderate orbital eccentricities of the binary’s and planetary orbits (like in Kepler-16 and 35 cases).

scholarly journals A Model of Stochastic Collisions as the Cause of Clumps in Debris Disks

2004 ◽  
Vol 202 ◽  
pp. 399-401
Author(s):  
M. C. Wyatt ◽  
W. R. F. Dent ◽  
J. S. Greaves ◽  
W. S. Holland
Keyword(s):  
Simple Model ◽  
Debris Disks ◽  
Heuristic Model ◽  
Detailed Model ◽  
Debris Disk ◽  
Collisional Evolution

We present a heuristic model for the collisional evolution of material in a debris disk. This is used to consider the probability that the 2-3% brightness clump observed in the sub-mm Fomalhaut disk is caused by stochastic collisions between large planetesimals. While this simple model finds that the probability that the clump is caused by collisions is low (about 1 in 80,000), a more detailed model is required to ascertain its true likelihood.

scholarly journals Measurements of magnetic fields in Herbig Ae/Be stars and stars with debris disks at the VLT 8-m telescope: statistical results of our long-term program

2010 ◽  
Vol 6 (S272) ◽  
pp. 224-226 ◽  
Author(s):  
Ruslan V. Yudin ◽  
Swetlana Hubrig ◽  
Michail A. Pogodin ◽  
Markus Schoeller ◽  
Ilya Ilyin
Keyword(s):  
Magnetic Fields ◽  
Field Measurements ◽  
Debris Disks ◽  
Be Stars ◽  
Significance Level ◽  
Magnetic Field Measurements ◽  
Stellar Magnetic Fields ◽  
Multi Mode ◽  
Statistical Results

AbstractWe present the results of magnetic field measurements for a sample of 23 young Herbig Ae/Be (HAEBEs) stars and 12 stars with debris disks. The spectropolarimetric data were obtained during four observing runs in 2003-2008 at the European Southern Observatory with the multi-mode instrument FORS 1 installed at the 8 m Kueyen telescope. Among the 23 HAEBEs studied, stellar magnetic fields of about 100-150G have been detected in 11 stars (i.e. ~50%). The presence of circumstellar polarization signatures formed in the stellar wind supports the assumption that the magnetic centrifuge is one of the main mechanisms of the wind acceleration. No field detection at a significance level of 3σ was achieved in stars with debris disks.

scholarly journals Twisted debris: how differential secular perturbations shape debris disks

2019 ◽  
Vol 631 ◽  
pp. A141
Author(s):  
J. A. Sende ◽  
T. Löhne
Keyword(s):  
Debris Disks ◽  
Orbital Elements ◽  
Secular Perturbations ◽  
Asymmetric Structures ◽  
Analytic Approximations ◽  
Grain Sizes ◽  
Gravitational Perturbations ◽  
Small Grains ◽  
Basic Equations ◽  
Collisional Evolution

Context. Resolved images suggest that asymmetric structures are a common feature of cold debris disks. While planets close to these disks are rarely detected, their hidden presence and gravitational perturbations provide plausible explanations for some of these features. Aims. To put constraints on the properties of yet undetected planetary companions, we aim to predict what features such a planet imprints in debris disks undergoing continuous collisional evolution. Methods. We discuss the basic equations, analytic approximations and timescales governing collisions, radiation pressure and secular perturbations. In addition, we combine our numerical model of the collisional evolution of the size and spatial distributions in debris disks with the gravitational perturbation by a single planet. Results. We find that the distributions of orbital elements in the disks are strongly dependent on grain sizes. Secular precession is differential with respect to involved semi-major axes and grain sizes. This leads to observable differences between the big grains tracing the parent belt and the small grains in the trailing halo. Observations at different wavelengths can be used to constrain the properties of a possible planet.

scholarly journals Determining the Origin of Inner Planetary System Debris Orbiting the Dustiest Main Sequence Stars

2012 ◽  
Vol 8 (S293) ◽  
pp. 273-277
Author(s):  
Carl Melis ◽  
B. Zuckerman ◽  
Joseph H. Rhee ◽  
Inseok Song ◽  
S. J. Murphy ◽  
...  
Keyword(s):  
Steady State ◽  
Main Sequence ◽  
Planetary System ◽  
Debris Disks ◽  
Main Sequence Stars ◽  
Transient Events ◽  
Collisional Evolution

AbstractWe develop a means to distinguish between warm dusty circumstellar debris disks produced by steady state collisional evolution of a planetesimal belt or through transient events.

scholarly journals THE COLLISIONAL EVOLUTION OF DEBRIS DISKS

2013 ◽  
Vol 768 (1) ◽  
pp. 25 ◽  
Author(s):  
András Gáspár ◽  
George H. Rieke ◽  
Zoltán Balog
Keyword(s):  
Debris Disks ◽  
Collisional Evolution

Therapy and prevention for mental health: What if mental diseases are mostly not brain disorders?

2019 ◽  
Vol 42 ◽  
Author(s):  
John P. A. Ioannidis
Keyword(s):  
Mental Health ◽  
Mental Disease ◽  
Brain Disorders ◽  
Social Stressors ◽  
Labor Education ◽  
Mental Diseases ◽  
Long Term Follow Up ◽  
Political Decisions

AbstractNeurobiology-based interventions for mental diseases and searches for useful biomarkers of treatment response have largely failed. Clinical trials should assess interventions related to environmental and social stressors, with long-term follow-up; social rather than biological endpoints; personalized outcomes; and suitable cluster, adaptive, and n-of-1 designs. Labor, education, financial, and other social/political decisions should be evaluated for their impacts on mental disease.

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