Results 71 to 80 of about 22,425 (264)

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

Research Progress on Atmospheric Turbulence Perception and Correction Based on Adaptive Optics and Deep Learning

Advanced Photonics Research, Volume 6, Issue 7, July 2025.
This work presents a systematic review of atmospheric turbulence fundamentals, including theoretical formulations and adaptive optics‐based mitigation strategies. This includes an in‐depth examination of the devices, theories, and methodologies associated with traditional correction approaches.
Qinghui Liu, Yihang Di, Mengmeng Zhang, Zhenbo Ren, Jianglei Di, Jianlin Zhao   +5 more
wiley   +1 more source

Impact of the initial disk mass function on the disk fraction

, 2015
The disk fraction, the percentage of stars with disks in a young cluster, is widely used to investigate the lifetime of the protoplanetary disk, which can impose an important constraint on the planet formation mechanism.
Ohsawa, Ryou, Onaka, Takashi, Yasui, Chikako   +2 more
core   +1 more source

Protoplanetary Disks as (Possibly) Viscous Disks [PDF]

The Astrophysical Journal, 2017
Abstract Protoplanetary disks are believed to evolve on megayear timescales in a diffusive (viscous) manner as a result of angular momentum transport driven by internal stresses. Here we use a sample of 26 protoplanetary disks resolved by ALMA with measured (dust-based) masses and stellar accretion rates to derive the dimensionless α ...
openaire   +3 more sources

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

Extinction Values toward Embedded Planets in Protoplanetary Disks Estimated from Hydrodynamic Simulations

The Astrophysical Journal
Upcoming new coronographs with deeper contrast limits, together with planned and current high-contrast imaging campaigns, will push the detectability limit of protoplanets.
Felipe Alarcón, Edwin A. Bergin, Gabriele Cugno   +2 more
doaj   +1 more source

Sensitive survey for 13CO, CN, H2CO, and SO in the disks of T Tauri and Herbig Ae stars II: Stars in $\rho$ Oph and upper Scorpius

, 2015
We attempt to determine the molecular composition of disks around young low-mass stars in the $\rho$ Oph region and to compare our results with a similar study performed in the Taurus-Auriga region.
Di Folco, E., Dutrey, A., Grosso, N., Guilloteau, S., Piétu, V., Reboussin, L., Simon, M., Wakelam, V.   +7 more
core   +3 more sources

Oued Chebeika 002: A new CI1 meteorite linked to outer solar system bodies

Meteoritics &Planetary Science, Volume 60, Issue 7, Page 1441-1479, July 2025.
Abstract CI1 chondrites are rare meteorites with high scientific value. In fact, they are the most chemically primitive meteorites and show evidence of intense parent‐body aqueous alteration. They also share strong similarities with samples from Ryugu and Bennu asteroids returned by the JAXA Hayabusa2 and NASA's OSIRIS‐REx missions.
J. Gattacceca, M. Gounelle, B. Devouard, J.‐A. Barrat, L. Bonal, A. J. King, C. Maurel, P. Beck, M. Roskosz, J.‐C. Viennet, D. Mukherjee, N. Dauphas, P. R. Heck, T. Yokoyama, K. López García, O. Poch, O. Grauby, C. S. Harrison, V. Vinogradoff, P. Vernazza, S. Tikoo, V. Vidal, P. Rochette, D. AuYang, D. Borschneck, J. Juraszek, B. Clark   +26 more
wiley   +1 more source

Circumplanetary Disks are Rare Around Planets at Large Orbital Radii: A Parameter Survey of Flow Morphology Around Giant Planets

The Astrophysical Journal
We investigate how the formation and structure of circumplanetary disks (CPDs) vary with planet mass and protoplanetary disk aspect ratio. Using static mesh refinement and a near-isothermal equation of state, we perform a small parameter survey of ...
Sabina Sagynbayeva, Rixin Li, Aleksandra Kuznetsova, Zhaohuan Zhu, Yan-Fei Jiang, Philip J. Armitage   +5 more
doaj   +1 more source

Photoevaporation of Protoplanetary Disks

Proceedings of the International Astronomical Union, 2020
AbstractPhotoelectric effect of dust grains by UV radiation is an important process for disk heating, but as a disk evolves, the amount of dust grains decreases. Photoeaporation is a disk dispersal process, which is caused by high-energy radiation. We perform a set of photoevaporation simulations solving hydrodynamics with radiative transfer and non ...
Ayano Komaki, Riouhei Nakatani, Naoki Yoshida   +2 more
openaire   +1 more source