Results 91 to 100 of about 376,241 (261)

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

PROTOPLANETARY DISK STRUCTURES IN OPHIUCHUS [PDF]

The Astrophysical Journal, 2009
ApJ in press: 51 pages, 13 ...
Sean M. Andrews, David J. Wilner, Annie Hughes, Chunhua Qi, Cornelis P. Dullemond   +4 more
openaire   +3 more sources

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

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

Chemical Evolution of a Protoplanetary Disk [PDF]

Proceedings of the International Astronomical Union, 2011
AbstractIn this paper we review recent progress in our understanding of the chemical evolution of protoplanetary disks. Current observational constraints and theoretical modeling on the chemical composition of gas and dust in these systems are presented.
openaire   +4 more sources

Exploring the Complex Ionization Environment of the Turbulent DM Tau Disk

The Astrophysical Journal
Ionization drives important chemical and dynamical processes within protoplanetary disks, including the formation of organics and water in the cold midplane and the transportation of material via accretion and magnetohydrodynamic flows.
Deryl E. Long, L. Ilsedore Cleeves, Fred C. Adams, Sean Andrews, Edwin A. Bergin, Viviana V. Guzmán, Jane Huang, A. Meredith Hughes, Chunhua Qi, Kamber Schwarz, Jacob B. Simon, David Wilner   +11 more
doaj   +1 more source

Impacts of Dust Feedback on a Dust Ring Induced by a Planet in a Protoplanetary Disk [PDF]

Astrophysical Journal, 2018
When a planet forms a deep gap in a protoplanetary disk, dust grains cannot pass through the gap. As a consequence, the density of the dust grains can increase up to the same level of the density of the gas at the outer edge. The feedback on the gas from
Kazuhiro D. Kanagawa, T. Muto, S. Okuzumi, T. Tanigawa, T. Taki, Yuhito Shibaike   +5 more
semanticscholar   +1 more source

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

Effect of Time-varying X-Ray Emission from Stellar Flares on the Ionization of Protoplanetary Disks

The Astrophysical Journal
X-rays have significant impacts on cold, weakly ionized protoplanetary disks by increasing the ionization rate and driving chemical reactions. Stellar flares are explosions that emit intense X-rays and are the unique source of hard X-rays with an energy ...
Haruka Washinoue, Shinsuke Takasao, Kenji Furuya   +2 more
doaj   +1 more source