Results 81 to 90 of about 16,784 (219)

When and why formation of large bodies in circumstellar discs could take place?

EPJ Web of Conferences, 2013
We outlined the scenario of the planetary system formation, where large bodies are formed on the stage of massive discs. On this stage the whole of factors: chemical composition, chemical catalytic reactions, the disc self- gravitation, the increased ...
Stadnichenko Olga A., Stoyanovskaya Olga P., Snytnikov Valeriy N.   +2 more
doaj   +1 more source

Metallicity of the Massive Protoplanets Around HR 8799 If Formed by Gravitational Instability

, 2009
The final composition of giant planets formed as a result of gravitational instability in the disk gas depends on their ability to capture solid material (planetesimals) during their 'pre-collapse' stage, when they are extended and cold, and contracting ...
Alexander, Bodenheimer, Boley, Boss, Boss, Cameron, Cuzzi, Decampli, Dodson-Robinson, Durisen, Greenzweig, Guillot, Haghighipour, Helled, Helled, Helled, Henyey, Hubickyj, Ida, Johansen, Kalas, Klahr, Mamatsashvili, Marley, Marois, Mayer, Mayer, Mayer, Morbidelli, P. Bodenheimer, Pollack, Pollack, R. Helled, Rafikov, Rice, Saumon   +35 more
core   +1 more source

A gap in the planetesimal disc around HD 107146 and asymmetric warm dust emission revealed by ALMA [PDF]

Monthly notices of the Royal Astronomical Society, 2018
While detecting low-mass exoplanets at tens of au is beyond current instrumentation, debris discs provide a unique opportunity to study the outer regions of planetary systems.
Sebastián Marino, J. Carpenter, M. Wyatt, M. Booth, S. Casassus, V. Faramaz, V. Guzmán, A. Hughes, A. Isella, G. Kennedy, L. Matrá, L. Ricci, S. Corder   +12 more
semanticscholar   +1 more source

The Oxygen Isotopic Composition of Samples Returned from Asteroid Ryugu with Implications for the Nature of the Parent Planetesimal

The Planetary Science Journal, 2023
We present oxygen isotopic analyses of fragments of the near-Earth C _b -type asteroid Ryugu returned by the Hayabusa2 spacecraft that reinforce the close correspondence between Ryugu and CI chondrites.
Haolan Tang, Edward D. Young, Lauren Tafla, Andreas Pack, Tommaso Di Rocco, Yoshinari Abe, Jérôme Aléon, Conel M. O’D. 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, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Motoo Ito, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Kouki Kitajima, Thorsten Kleine, Shintaro Komatani, Alexander N. Krot, Ming-Chang Liu, Yuki Masuda, Kevin D. McKeegan, Mayu Morita, Kazuko Motomura, Frédéric Moynier, Kazuhide Nagashima, Izumi Nakai, Ann Nguyen, Larry Nittler, Morihiko Onose, Changkun Park, Laurette Piani, Liping Qin, Sara S. Russell, Naoya Sakamoto, Maria Schönbächler, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing-Zhu Yin, Tetsuya Yokoyama, Shigekazu Yoneda, 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
doaj   +1 more source

Circumbinary Planet Formation in the Kepler-16 system. I. N-body Simulations

, 2012
The recently discovered circumbinary planets (Kepler-16 b, Kepler-34 b, Kepler-35 b) represent the first direct evidence of the viability of planet formation in circumbinary orbits.
Holman, Ida, Marzari, Marzari, Meschiari, Moriwaki, Slawson, Stefano Meschiari, Stewart, Weidenschilling, Winn, Xie, Xie   +12 more
core   +1 more source

A Population Synthesis Study on the Formation of Cold Jupiters from Truncated Planetesimal Disks

The Astrophysical Journal
The occurrence rate of giant planets increases with orbital period and turns over at a location that roughly corresponds to the snowline of solar-type stars.
Kangrou Guo, Masahiro Ogihara, Shigeru Ida, Yasunori Hori, Kaiming Cui, Fabo Feng   +5 more
doaj   +1 more source

Bubbles to Chondrites-II. Chemical fractionations in chondrites

Progress in Earth and Planetary Science, 2021
We attempt to develop a possible theory of chemical fractionations in chondrites, that is consistent with various features of chondritic components and current observation of protoplanetary disks (PPD).
Akihiko Hashimoto, Yuki Nakano
doaj   +1 more source

Accretion Bursts in Young Intermediate-mass Stars Make Planet Formation Challenging

The Astrophysical Journal
We investigate the occurrence of accretion bursts, dust accumulation, and the prospects for planetesimal formation in a gravitationally unstable magnetized protoplanetary disk (PPD) with globally suppressed but episodically triggered magnetorotational ...
Indrani Das, Eduard Vorobyov, Shantanu Basu   +2 more
doaj   +1 more source

Vega's hot dust from icy planetesimals scattered inward by an outward-migrating planetary system

, 2014
Vega has been shown to host multiple dust populations, including both hot exo-zodiacal dust at sub-AU radii and a cold debris disk extending beyond 100 AU.
Bonsor, Amy, Raymond, Sean N.
core   +3 more sources

Evidence for Universality in the Initial Planetesimal Mass Function [PDF]

, 2017
Planetesimals may form from the gravitational collapse of dense particle clumps initiated by the streaming instability. We use simulations of aerodynamically coupled gas–particle mixtures to investigate whether the properties of planetesimals formed in ...
J. Simon, P. Armitage, A. Youdin, Rixin Li   +3 more
semanticscholar   +1 more source