Article
Astronomy & Astrophysics
R. O. Chametla, O. Chrenko
Summary: This study investigates the gravitational interaction between planets and pressure bumps in a gas-dust protoplanetary disc, exploring the changes in disc structure and planet migration. Through simulations, it is found that pressure bumps quickly merge into a single, wide bump, accompanied by the formation of vortices and density waves. The interaction between spiral waves generated by the vortex and the planet's waves leads to slower migration and increased orbital eccentricities for the planets.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
David A. Velasco Romero, Frederic S. Masset, Romain Teyssier
Summary: In this study, the eccentricity of a low-mass, luminous planet embedded in an inviscid disc is evaluated using high-resolution hydrodynamical, three-dimensional calculations. The study finds that low-mass planets generally have eccentricities comparable to the aspect ratio of the disc, suggesting that eccentric, low-mass protoplanets should be the norm rather than the exception.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Shangjia Zhang, Zhaohuan Zhu, Mingon Kang
Summary: We developed a neural network model called PGNets to infer planet mass accurately and quickly from radio dust continuum images. By utilizing substructures induced by young planets in protoplanetary discs, we were able to infer properties of potential young planets. Our approach is more efficient and preserves asymmetric features in discs compared to previous simulation methods.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Kevin Chan, Sijme-Jan Paardekooper
Summary: Recent observations have shown the importance of including dust in modeling protoplanetary discs. However, simulating the interactions between dust and gas separately poses computational difficulties. This study proposes a single-fluid approach that incorporates the terminal velocity approximation to overcome these difficulties. Comparing this approach with a multifluid model, differences in dust density distribution are found for different planet masses. The terminal velocity approximation proves to be a valuable tool but caution is needed when dealing with shocks.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Alexandros Ziampras, Richard P. Nelson, Roman R. Rafikov
Summary: ALMA observations of protoplanetary discs in dust continuum emission show various annular structures. These features are believed to be caused by embedded planets, as supported by hydrodynamical models. A new study compares previous models with local cooling to new models with cooling in the vertical direction and radiative diffusion in the disc plane, finding significant differences in how the disc responds to induced spiral waves and that the new models better reproduce observations. The study concludes that the treatment of radiation transport is crucial in interpreting ALMA observations using the planet-disc interaction scenario.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Michael Y. Grudic
Summary: This study shows that optimizing gravity calculations in hydrodynamic simulations by updating gravity only on a specific time scale can significantly reduce the evaluation frequency of gravity forces while maintaining simulation accuracy and efficiency. Testing on standard problems and a simulation of a giant molecular cloud demonstrates close solutions to the traditional approach and around a 70% speed-up.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
S. Anathpindika, J. Di Francesco
Summary: Filaments play a crucial role in the star formation process and their morphology and evolution are influenced by external pressure. Increasing external pressure leads to lower efficiency in star formation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
G. Lodato, L. Rampinelli, E. Viscardi, C. Longarini, A. Izquierdo, T. Paneque-Carreno, L. Testi, S. Facchini, A. Miotello, B. Veronesi, C. Hall
Summary: ALMA observations of line emission from planet-forming discs have proven to be a valuable tool for studying their internal dynamics, revealing important processes such as turbulence and the presence of planets. In this study, the authors refine their methodology and apply it to two additional sources, GM Aur and IM Lup. The results show consistent disc masses for IM Lup, but slightly inconsistent rotation curves for GM Aur, indicating the need for caution in interpreting the results for the latter source due to its complex kinematics and interactions with the infalling cloud.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
G. Lodato, L. Rampinelli, E. Viscardi, C. Longarini, A. Izquierdo, T. Paneque-Carreno, L. Testi, S. Facchini, A. Miotello, B. Veronesi, C. Hall
Summary: ALMA observations of line emission from planet-forming discs are crucial for probing internal disc kinematics and understanding important dynamical processes. The study shows that such observations can accurately measure disc mass independently of mass conversion factors. Measurements of consistent disc masses were obtained for IM Lup and GM Aur, but caution is advised for interpreting results for GM Aur due to complex kinematics in the outer disc.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
P. D. Mullen, Tomoyuki Hanawa, C. F. Gammie
Summary: In this study, a fully conservative numerical algorithm for self-gravitating flows was implemented using source terms, demonstrating advantages such as second-order convergence and conservation of total momentum and total energy. The scheme suppresses anomalous accelerations arising from the common numerical discretization of the gravitational stress tensor that does not guarantee curl-free gravity.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2021)
Article
Astronomy & Astrophysics
Eduard I. Vorobyov, James McKevitt, Igor Kulikov, Vardan Elbakyan
Summary: The aim of this study is to develop a fast and accurate method for computing the gravitational potential of astrophysical objects with high contrast in density using nested or adaptive meshes. The researchers extended the convolution method to nested Cartesian grids and utilized the convolution theorem to compute the gravitational potential. The results showed that the convolution method outperformed iterative methods in terms of runtime by a factor of 10-200 when graphics processor units were utilized, and it also exhibited an overall second-order convergence.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
N. Ndugu, O. P. Abedigamba, G. Andama
Summary: This study investigates how protoplanetary discs in stellar clusters are affected by background heating, disc truncation, and photoevaporation, and how disc truncation impacts planet formation. The findings show that disc truncation reduces disc mass and decreases the occurrence rates of gas giant planets, with hot Jupiters being more frequent than cold Jupiters.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Physics, Multidisciplinary
M. Z. Bhatti, Z. Yousaf
Summary: This paper investigates the instability limits of stellar objects in the context of a specific modified gravity theory, focusing on a spherically symmetric anisotropic charged fluid influenced by this modified gravity. By perturbing the modified field equations in the background of Gauss-Bonnet gravity, the collapse equation is derived. The dynamical instability of the fluid is found to be explained by the adiabatic index, determined by the static profile of material variables.
CHINESE JOURNAL OF PHYSICS
(2021)
Article
Astronomy & Astrophysics
Tao Liu, Shengxia Gong, Xinhao Liao
Summary: The study reveals that the perturbation of the MN disc can lead to von Zeipel-Lidov-Kozai (ZLK)-like dynamics, with two different manifestations depending on the value of eta. When eta < 1/3, the behavior of the test particle is similar to that of the classical ZLK problem, while when eta > 1/3, the orbital evolution and phase-space morphology are opposite to the classical ZLK case.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Evan Fitzmaurice, David Martin, Daniel C. Fabrycky
Summary: Resonant locking of two planets is an expected outcome of convergent disc migration, but the outcome depends on the planet-planet mass ratio. Smaller outer planets tend to be parked in stable exterior resonance with the inner planet, while equal or larger mass outer planets can eject or flip the inner planet to an exterior orbit.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
David A. Velasco Romero, Maria Han Veiga, Romain Teyssier, Frederic S. Masset
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2018)
Article
Astronomy & Astrophysics
David A. Velasco Romero, Frederic S. Masset
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2019)
Article
Physics, Mathematical
Maria Han Veiga, David A. Velasco-Romero, Remi Abgrall, Romain Teyssier
COMMUNICATIONS IN COMPUTATIONAL PHYSICS
(2019)
Article
Astronomy & Astrophysics
David A. Velasco Romero, Frederic S. Masset
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Proceedings Paper
Astronomy & Astrophysics
F. S. Masset, D. A. Velasco Romero, H. Eklund
12TH INTERNATIONAL CONFERENCE ON NUMERICAL MODELING OF SPACE PLASMA FLOWS: ASTRONUM-2017
(2018)
Article
Astronomy & Astrophysics
Jeffrey Fung, Frederic Masset, Elena Lega, David Velasco
ASTRONOMICAL JOURNAL
(2017)