Results 41 to 50 of about 54,720 (190)

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

CI Traces the Disk Atmosphere in the IM Lup Protoplanetary Disk

The Astrophysical Journal Letters, 2023
The central star and its energetic radiation fields play a vital role in setting the vertical and radial chemical structure of planet-forming disks.
Charles J. Law, Felipe Alarcón, L. Ilsedore Cleeves, Karin I. Öberg, Teresa Paneque-Carreño   +4 more
doaj   +1 more source

Search for pre‐accretionary irradiation effects in calcium‐aluminum inclusions from the CV3 chondrite Allende

Meteoritics &Planetary Science, Volume 60, Issue 2, Page 247-272, February 2025.
Abstract Calcium‐aluminum‐rich inclusions (CAIs) are the first objects that formed in the solar accretion disk and therefore provide valuable insights into the evolution of the early solar system. A long‐standing question regarding this earliest formative period relates to the storage of CAIs in the 1–4 Myr time period between their formation and later
P. Ghaznavi, C. Burkhardt, F. L. H. Tissot, I. Leya   +3 more
wiley   +1 more source

Emission from Multiple Molecular Isotopologues in a High-inclination Protoplanetary Disk

The Astronomical Journal
We present a MIRI-MRS spectrum of the high-inclination protoplanetary disk around the solar-mass (K0) star MY Lup, obtained as part of the JWST Disk Infrared Spectral Chemistry Survey (JDISCS). The spectrum shows an unusually weak water emission spectrum
Colette Salyk, Klaus M. Pontoppidan, Andrea Banzatti, Edwin Bergin, Nicole Arulanantham, Joan Najita, Geoffrey A. Blake, John Carr, Ke Zhang, Chengyan Xie   +9 more
doaj   +1 more source

Zirconium isotope composition indicates s‐process depletion in samples returned from asteroid Ryugu

Meteoritics &Planetary Science, Volume 60, Issue 1, Page 3-16, January 2025.
Abstract Nucleosynthetic isotope variations are powerful tracers to determine genetic relationships between meteorites and planetary bodies. They can help to link material collected by space missions to known meteorite groups. The Hayabusa 2 mission returned samples from the Cb‐type asteroid (162173) Ryugu.
Maria Schönbächler, Manuela A. Fehr, Tetsuya Yokoyama, Ikshu Gautam, Nao Nakanishi, Yoshinari Abe, Jérôme Aléon, Conel Alexander, Sachiko Amari, Yuri Amelin, Ken‐ichi Bajo, Martin Bizzarro, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon‐Gak Choi, Nicolas Dauphas, Andrew M. Davis, Tommaso Di Rocco, Wataru Fujiya, Ryota Fukai, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor Ireland, Akira Ishikawa, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Koki Kitajima, Thorsten Kleine, Shintaro Komatani, Alexander N. Krot, Ming‐Chang Liu, Yuki Masuda, Mayu Morita, Kazuko Motomura, Frédéric Moynier, Izumi Nakai, Kazuhide Nagashima, Ann Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Sara Russell, Naoya Sakamoto, Lauren Tafla, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing‐Zhu Yin, Shigekazu Yoneda, Edward D. Young, Hiroharu Yui, Ai‐Cheng Zhang, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tatsuaki Okada, Toru Yada, Kasumi Yogata, Satoru Nakazawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei‐ichiro Watanabe, Makoto Yoshikawa, Shogo Tachibana, Hisayoshi Yurimoto   +89 more
wiley   +1 more source

Evidence for Magnetically‐Driven Accretion in the Distal Solar System

AGU Advances, Volume 5, Issue 6, December 2024.
Abstract Paleomagnetic measurements of meteorites indicate that magnetic fields existed in the inner solar nebula capable of driving accretion at rates similar to those observed for young stellar objects with protoplanetary disks. However, the field strength in the solar system beyond ∼7 astronomical units (AU) and its role in accretion remain poorly ...
Elias N. Mansbach, Benjamin P. Weiss, Eduardo A. Lima, Michael Sowell, Joseph L. Kirschvink, Roger R. Fu, Saverio Cambioni, Xue‐Ning Bai, Jodie B. Ream, Chisato Anai, Atsuko Kobayashi, Hironori Hidaka   +11 more
wiley   +1 more source

Dust Coagulation Reconciles Protoplanetary Disk Observations with the Vertical Shear Instability. I. Dust Coagulation and the VSI Dead Zone

The Astrophysical Journal, 2023
Protoplanetary disks exhibit a vertical gradient in angular momentum, rendering them susceptible to the vertical shear instability (VSI). The most important condition for the onset of this mechanism is a short timescale of thermal relaxation (≲0.1 ...
Thomas Pfeil, Tilman Birnstiel, Hubert Klahr   +2 more
doaj   +1 more source

Dust Coagulation and Settling in Layered Protoplanetary Disks [PDF]

, 2006
Previous models of dust growth in protoplanetary disks considered either uniformly laminar or turbulent disks. This Letter explores how dust growth occurs in a layered protoplanetary disk in which the magnetorotational instability generates turbulence only in the surface layers of a disk.
arxiv   +1 more source

Deriving median disk lifetimes from disk lifetime distributions [PDF]

arXiv, 2022
Observations show that individual protoplanetary disk lifetimes vary from \mbox{$<$ 1 Myr} to $\gg$ 20 Myr. The disk lifetime distribution is currently unknown. For the example of a Gaussian distribution of the disk lifetime, I suggest a simple method for deducing such a disk lifetimes distribution.
arxiv  

Magma Ocean Evolution at Arbitrary Redox State

Journal of Geophysical Research: Planets, Volume 129, Issue 12, December 2024.
Abstract Interactions between magma oceans and overlying atmospheres on young rocky planets leads to an evolving feedback of outgassing, greenhouse forcing, and mantle melt fraction. Previous studies have predominantly focused on the solidification of oxidized Earth‐similar planets, but the diversity in mean density and irradiation observed in the low ...
Harrison Nicholls, Tim Lichtenberg, Dan J. Bower, Raymond Pierrehumbert   +3 more
wiley   +1 more source