Results 91 to 100 of about 394,629 (288)

On the Formation of Planets in the Milky Way’s Thick Disk

The Astrophysical Journal
Exoplanet demographic surveys have revealed that close-in (≲1 au) small planets orbiting stars in the Milky Way’s thick disk are ∼50% less abundant than those orbiting stars in the Galactic thin disk.
Tim Hallatt, Eve J. Lee
doaj   +1 more source

The Roles of Dust Growth in the Temperature Evolution and Snow Line Migration in Magnetically Accreting Protoplanetary Disks

The Astrophysical Journal, 2023
The temperature structure of protoplanetary disks provides an important constraint on where in the disks rocky planets like our own form. Recent nonideal magnetohydrodynamical (MHD) simulations have shown that the internal Joule heating associated with ...
Katsushi Kondo, Satoshi Okuzumi, Shoji Mori   +2 more
doaj   +1 more source

Long Term Evolution of Planet-Induced Vortices in Protoplanetary Disks

, 2014
Recent observations of large-scale asymmetric features in protoplanetary disks suggest that large-scale vortices exist in such disks. Massive planets are known to be able to produce deep gaps in protoplanetary disks.
Fu, Wen, Li, Hui, Li, Shengtai, Lubow, Stephen   +3 more
core   +1 more source

Structure and evolution of protoplanetary disks [PDF]

, 2008
We present here a few thoughts on how high-angular resolution observations can give clues to some properties of protoplanetary disks that are fundamental to theories of planet formation.
Apai, Daniel, Dullemond, Cornelis, Pavlyuchenkov, Yaroslav, Pontoppidan, Klaus   +3 more
core   +1 more source

Deep Space Network Radio Science and Ground‐Based Planetary Radar in the Next Decade

Radio Science, Volume 60, Issue 7, July 2025.
Abstract The Deep Space Network (DSN) has been a core operational element of NASA's crewed and robotic exploration of the Solar System since the early 1960s. The primary role of the DSN has been to acquire telemetry and navigation data, but over the years, its radiometric and radar capabilities have expanded to form a system for obtaining unique ...
R. S. Park, J. E. Riedel, N. Rodriguez‐Alvarez, M. Brozovic, L. A. M. Benner, P. Vergados, D. Buccino, C. S. Jacobs, L. S. Locke, S. W. Asmar, R. Castano, T. J. W. Lazio, J. Jao, C. Lee   +13 more
wiley   +1 more source

The Nitrogen Carrier in Inner Protoplanetary Disks [PDF]

The Astrophysical Journal, 2019
Abstract The dominant reservoirs of elemental nitrogen in protoplanetary disks have not yet been observationally identified. Likely candidates are HCN, NH3, and N2. The relative abundances of these carriers determine the composition of planetesimals as a function of disk radius due to strong differences in their volatility. A significant
Klaus M. Pontoppidan, Colette Salyk, Andrea Banzatti, Geoffrey A. Blake, Catherine Walsh, John H. Lacy, Matthew J. Richter   +6 more
openaire   +6 more sources

Disk2Planet: A Robust and Automated Machine Learning Tool for Parameter Inference in Disk–Planet Systems

The Astrophysical Journal
We introduce Disk2Planet, a machine-learning-based tool to infer key parameters in disk–planet systems from observed protoplanetary disk structures. Disk2Planet takes as input the disk structures in the form of 2D density and velocity maps, and outputs ...
Shunyuan Mao, Ruobing Dong, Kwang Moo Yi, Lu Lu, Sifan Wang, Paris Perdikaris   +5 more
doaj   +1 more source

Disk formation and structure*

EPJ Web of Conferences, 2015
In this chapter, we cover the formation of protoplanetary disk as a natural byproduct of the gravitational collapse of a slowly rotating, hydrostatic cloud.
Dominik Carsten
doaj   +1 more source

Probing the Inner Regions of Protoplanetary Disks with CO Absorption Line Spectroscopy

, 2013
Carbon monoxide (CO) is the most commonly used tracer of molecular gas in the inner regions of protoplanetary disks. CO can be used to constrain the excitation and structure of the circumstellar environment.
Brown, Alexander, Brown, Joanna, Burgh, Eric B., France, Kevin, Herczeg, Gregory J., McJunkin, Matthew, Schindhelm, Eric   +6 more
core   +1 more source

Spiral density waves in a young protoplanetary disk [PDF]

Science, 2016
Gravitational forces are expected to excite spiral density waves in protoplanetary disks, disks of gas and dust orbiting young stars. However, previous observations that showed spiral structure were not able to probe disk midplanes, where most of the ...
L. Pérez, J. Carpenter, S. Andrews, L. Ricci, A. Isella, H. Linz, A. Sargent, D. Wilner, T. Henning, A. Deller, C. Chandler, C. Dullemond, J. Lazio, K. Menten, S. Corder, S. Storm, L. Testi, M. Tazzari, W. Kwon, N. Calvet, J. Greaves, R. Harris, L. Mundy   +22 more
semanticscholar   +1 more source