scholarly journals Testing planet formation models with Gaia μas astrometry

2007 ◽  
Vol 3 (S248) ◽  
pp. 256-259 ◽  
Author(s):  
A. Sozzetti ◽  
S. Casertano ◽  
M. G. Lattanzi ◽  
A. Spagna ◽  
R. Morbidelli ◽  
...  
Keyword(s):  
Large Scale ◽  
Extrasolar Planets ◽  
Planet Formation ◽  
Planetary Systems ◽  
Unique Contribution ◽  
Double Blind

AbstractIn this paper, we first summarize the results of a large-scale double-blind tests campaign carried out for the realistic estimation of the Gaia potential in detecting and measuring planetary systems. Then, we put the identified capabilities in context by highlighting the unique contribution that the Gaia exoplanet discoveries will be able to bring to the science of extrasolar planets during the next decade.

scholarly journals The Structure and Evolution of Protoplanetary Disks: an Infrared and Submillimeter View

2015 ◽  
Vol 10 (S314) ◽  
pp. 128-134
Author(s):  
Lucas A. Cieza
Keyword(s):  
Formation Process ◽  
Extrasolar Planets ◽  
Planet Formation ◽  
Planetary Systems ◽  
Protoplanetary Disks ◽  
Circumstellar Disks ◽  
Submillimeter Wavelength ◽  
High Incidence ◽  
Near Future ◽  
Very High

AbstractCircumstellar disks are the sites of planet formation, and the very high incidence of extrasolar planets implies that most of them actually form planetary systems. Studying the structure and evolution of protoplanetary disks can thus place important constraints on the conditions, timescales, and mechanisms associated with the planet formation process. In this review, we discuss observational results from infrared and submillimeter wavelength studies. We review disk lifetimes, transition objects, disk demographics, and highlight a few remarkable results from ALMA Early Science observations. We finish with a brief discussion of ALMA's potential to transform the field in near future.

scholarly journals Dynamical Problems in Extrasolar Planetary Science

2015 ◽  
Vol 11 (A29A) ◽  
pp. 3-5
Author(s):  
Alessandro Morbidelli ◽  
Nader Haghighipour
Keyword(s):  
Solar System ◽  
Extrasolar Planets ◽  
Planet Formation ◽  
Planetary Systems ◽  
Planetary Science ◽  
Orbital Dynamics ◽  
The Past

The past few years have witnessed a large increase in the number of extrasolar planets. Thanks to successful surveys from the ground and from space, there are now over 1000 confirmed exoplanets and more then 3000 planetary candidates. More than 130 of these systems host multiple planets. Many of these systems demonstrate physical and orbital characteristics fundamentally different from those of our solar system. The challenges associated with the diversity of planetary systems have raised many interesting questions on planet formation and orbital dynamics.

scholarly journals Planet gaps in the dust layer of 3D proto-planetary disks: Observability with ALMA

2013 ◽  
Vol 8 (S299) ◽  
pp. 115-116
Author(s):  
J.-F. Gonzalez ◽  
C. Pinte ◽  
S. T. Maddison ◽  
F. Ménard
Keyword(s):  
Formation Process ◽  
Extrasolar Planets ◽  
Planet Formation ◽  
Planetary Systems ◽  
Dust Layer ◽  
Younger Age

AbstractAmong the numerous known extrasolar planets, only a handful have been imaged directly so far, at large orbital radii and in rather evolved systems. The Atacama Large Millimeter/submillimeter Array (ALMA) will have the capacity to observe these wide planetary systems at a younger age, thus bringing a better understanding of the planet formation process. Here we explore the ability of ALMA to detect the gaps carved by planets on wide orbits.

From Dust to Life

2017 ◽  
Author(s):  
John Chambers ◽  
Jacqueline Mitton
Keyword(s):  
Solar System ◽  
Extrasolar Planets ◽  
Planetary Systems ◽  
History Of Astronomy ◽  
Human Origins ◽  
History Of ◽  
The Subject ◽  
Emergence Of Life

The birth and evolution of our solar system is a tantalizing mystery that may one day provide answers to the question of human origins. This book tells the remarkable story of how the celestial objects that make up the solar system arose from common beginnings billions of years ago, and how scientists and philosophers have sought to unravel this mystery down through the centuries, piecing together the clues that enabled them to deduce the solar system's layout, its age, and the most likely way it formed. Drawing on the history of astronomy and the latest findings in astrophysics and the planetary sciences, the book offers the most up-to-date and authoritative treatment of the subject available. It examines how the evolving universe set the stage for the appearance of our Sun, and how the nebulous cloud of gas and dust that accompanied the young Sun eventually became the planets, comets, moons, and asteroids that exist today. It explores how each of the planets acquired its unique characteristics, why some are rocky and others gaseous, and why one planet in particular—our Earth—provided an almost perfect haven for the emergence of life. The book takes readers to the very frontiers of modern research, engaging with the latest controversies and debates. It reveals how ongoing discoveries of far-distant extrasolar planets and planetary systems are transforming our understanding of our own solar system's astonishing history and its possible fate.

scholarly journals Retrograde resonances in compact multi-planetary systems: a feasible stabilizing mechanism

2007 ◽  
Vol 3 (S249) ◽  
pp. 511-516 ◽  
Author(s):  
Julie Gayon ◽  
Eric Bois
Keyword(s):  
Body Problem ◽  
Extrasolar Planets ◽  
Planetary Systems ◽  
Central Star ◽  
Point Of View ◽  
Outer Planet ◽  
Mean Motion Resonances ◽  
Hot Jupiters ◽  
The Stability ◽  
Orbital Data

AbstractMulti-planet systems detected until now are in most cases characterized by hot-Jupiters close to their central star as well as high eccentricities. As a consequence, from a dynamical point of view, compact multi-planetary systems form a variety of the general N-body problem (with N ≥ 3), whose solutions are not necessarily known. Extrasolar planets are up to now found in prograde (i.e. direct) orbital motions about their host star and often in mean-motion resonances (MMR). In the present paper, we investigate a theoretical alternative suitable for the stability of compact multi-planetary systems. When the outer planet moves on a retrograde orbit in MMR with respect to the inner planet, we find that the so-called retrograde resonances present fine and characteristic structures particularly relevant for dynamical stability. We show that retrograde resonances and their resources open a family of stabilizing mechanisms involving specific behaviors of apsidal precessions. We also point up that for particular orbital data, retrograde MMRs may provide more robust stability compared to the corresponding prograde MMRs.

scholarly journals Gravitational instability and the formation of planetary systems of solar-type stars

2021 ◽  
pp. 1-32
Author(s):  
Mikhail Semenovich Legkostupov
Keyword(s):  
Large Scale ◽  
Gravitational Instability ◽  
Planetary Systems ◽  
Complete Model ◽  
Ring Model ◽  
Gravitational Instabilities ◽  
Planetary Satellites ◽  
Solar Type

The fundamental principles of the protoplanetary ring model – the model of formation of planetary systems of stars, which is based on the origin and development of large-scale gravitational instabilities (protoplanetary rings) – are extended to the formation of regular planetary satellites. Based on these principles, a complete model of the formation of planetary systems, including their satellites, (model of gas and dust rings) for solar-type stars is proposed.

scholarly journals Review of the Studies in the Use of Biofeedback Therapy in Rehabilitation and Physiatrics of Neurological Patients

Doctor Ru ◽  
2021 ◽  
Vol 20 (9) ◽  
pp. 43-47
Author(s):  
E.Yu. Mozheyko ◽  
◽  
O.V. Petryaeva ◽  
◽  
◽  
...  
Keyword(s):  
Large Scale ◽  
Small Sample Size ◽  
Small Sample ◽  
Healthy Population ◽  
Biofeedback Therapy ◽  
Level Of Evidence ◽  
Double Blind ◽  
Key Points ◽  
Neurological Patients ◽  
Drug Free

Objective of the Review: To collect information, analyse and evaluate previous studies in the use of biofeedback in neurological patients. Key Points. Despite the wide practical application and a lot of available publications, the level of evidence of this method is low because of a small sample size and the challenges with biofeedback mechanism description. A review of various types of biocontrol, its mechanisms and developments shows that drug-free therapy using only patient’s resources (organic, psychological, emotional and volitional) can activate the mechanisms of neuroplasticity, which are poorly studied. Still, it does not prevent from using biocontrol for the therapy of patients and/or prevention of various diseases in healthy population. Conclusion. Biofeedback therapy has proven to be a safe, relatively efficient and easy-to-use method. However, organisation of a large-scale double blind randomized trial is one of the predominant directions in the future. Keywords: biofeedback, biocontrol, neurofeedback, biofeedback therapy.

scholarly journals DUPLICITY IN REGULATION AND PERFORMANCE OF THE FINANCIAL SECTOR IN KENYA

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Dr.Agnes Ogada
Keyword(s):  
Large Scale ◽  
Developing Economies ◽  
Financial Sector ◽  
The United States ◽  
Empirical Literature ◽  
Unique Contribution ◽  
Regulatory Structure ◽  
The Public ◽  
And Performance ◽  
The Uk

Purpose: The objective of the study was to investigate the duplicity in regulation and its effect on performance of the financial sector in Kenya. The specific objectives were; to review and identify regulation duplication/competition in existing regulatory framework for the financial sector in Kenya; to describe how regulatory effectiveness has been measured in empirical literature; to assess whether the current regulatory structure has affected the performance of the financial sector in Kenya and lastly to suggest potential ways of enhancing regulatory effectiveness in Kenya. Methodology: The paper used a desk study review methodology where relevant empirical literature was reviewed to identify main themes and to extract knowledge gaps. Findings: The study found out that financial sector in Kenya and other developing economies have reported losses on a large scale due to under regulation and regulator duplicity. Some of these have become insolvent, or have had to be taken over or rescued by their governments. A single market regulator clearly has its own advantages over multiple regulators. But it is more suitable for well-developed and mature markets which are smaller in size, like the UK. The study also found out that Kenya’s economy and political arena are not mature enough to handle a single financial market regulator. In this light it can be asserted that even mature economies such as the United States still have multiple regulators. Unique contribution to theory, practice and policy: Adherence to principles of open government, including transparency and participation in the regulatory process to ensure that regulation serves the public interest and is informed by the legitimate needs of those interested in and affected by regulation. Governments should ensure that regulations are comprehensible and clear and that parties can easily understand their rights and obligations. Organizations should create personalized technology systems that create a demand adaptation of ICT at every level of the organizational operations

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