Results 51 to 60 of about 399,848 (263)

First Detection of the Simplest Organic Acid in a Protoplanetary Disk [PDF]

Astrophysical Journal, 2018
The formation of asteroids, comets, and planets occurs in the interior of protoplanetary disks during the early phase of star formation. Consequently, the chemical composition of the disk might shape the properties of the emerging planetary system.
C. Favre, D. Fedele, D. Semenov, S. Parfenov, C. Codella, C. Ceccarelli, E. Bergin, E. Chapillon, L. Testi, F. Hersant, B. Lefloch, F. Fontani, G. Blake, L. Cleeves, C. Qi, K. Schwarz, V. Taquet   +16 more
semanticscholar   +1 more source

Kinematic Evidence of an Embedded Protoplanet in HD 142666 Identified by Machine Learning

The Astrophysical Journal, 2023
Observations of protoplanetary disks have shown that forming exoplanets leave characteristic imprints on the gas and dust of the disk. In the gas, these forming exoplanets cause deviations from Keplerian motion, which can be detected through molecular ...
J. P. Terry, C. Hall, S. Abreau, S. Gleyzer   +3 more
doaj   +1 more source

An ALMA Survey of Protoplanetary Disks in the $\sigma$ Orionis Cluster [PDF]

, 2017
The $\sigma$ Orionis cluster is important for studying protoplanetary disk evolution, as its intermediate age ($\sim$3-5 Myr) is comparable to the median disk lifetime. We use ALMA to conduct a high-sensitivity survey of dust and gas in 92 protoplanetary
Ansdell, Megan, Facchini, Stefano, Manara, Carlo F., Miotello, Anna, Testi, Leonardo, van der Marel, Nienke, van Dishoeck, Ewine F., Williams, Jonathan P.   +7 more
core   +3 more sources

Planetesimal formation during protoplanetary disk buildup [PDF]

Astronomy & Astrophysics, 2018
Context. Models of dust coagulation and subsequent planetesimal formation are usually computed on the backdrop of an already fully formed protoplanetary disk model.
J. Dra̧żkowska, C. Dullemond
semanticscholar   +1 more source

The Radial Distribution of Dust Particles in the HL Tau Disk from ALMA and VLA Observations [PDF]

, 2019
Understanding planet formation requires one to discern how dust grows in protoplanetary disks. An important parameter to measure in disks is the maximum dust grain size present.
Anglada, Guillem, Carrasco-Gonzalez, Carlos, Chandler, Claire, Flock, Mario, Galvan-Madrid, Roberto, Henning, Thomas, Linz, Hendrik, Liu, Yao, Macias, Enrique, Osorio, Mayra, Perez, Laura, Rodriguez, Luis F., Sierra, Anibal, Testi, Leonardo, Torrelles, Jose M., Zhu, Zhaohuan   +15 more
core   +3 more sources

Midplane temperature and outer edge of the protoplanetary disk around HD 163296 [PDF]

Astronomy & Astrophysics, 2019
Knowledge of the midplane temperature of protoplanetary disks is one of the key ingredients in theories of dust growth and planet formation. However, direct measurement of this quantity is complicated, and often depends on the fitting of complex models ...
C. Dullemond, A. Isella, S. Andrews, Iuliia Skobleva, N. Dzyurkevich   +4 more
semanticscholar   +1 more source

Noble gases and nitrogen in material from asteroid Bennu

Meteoritics &Planetary Science, EarlyView.
Abstract We report the elemental and isotopic abundances of all stable noble gases (helium, neon, argon, krypton, and xenon) in eight particles from asteroid Bennu returned by NASA's OSIRIS‐REx mission. We also report nitrogen abundances and isotopic ratios that were analyzed alongside neon and argon in four additional Bennu particles.
B. Marty, L. Zimmermann, E. Füri, D. V. Bekaert, J. J. Barnes, A. N. Nguyen, H. C. Connolly, D. S. Lauretta   +7 more
wiley   +1 more source

Development of 1D Non-ideal MHD Simulation Code Towards understanding Long-term Evolution of Protoplanetary Disk

The Astrophysical Journal
We developed a one-dimensional magnetohydrodynamic (MHD) simulation code to investigate the long-term evolution of protoplanetary disks with low computational cost.
Yudai Kobayashi, Daisuke Takaishi, Yusuke Tsukamoto, Shantanu Basu   +3 more
doaj   +1 more source

Upper limits on CH3OH in the HD 163296 protoplanetary disk [PDF]

Astronomy & Astrophysics, 2019
Context. Methanol (CH3OH) is at the root of organic ice chemistry in protoplanetary disks. Its connection to prebiotic chemistry and its role in the chemical environment of the disk midplane make it an important target for disk chemistry studies. However,
M. Carney, M. Hogerheijde, V. Guzm'an, C. Walsh, K. Öberg, E. Fayolle, L. Cleeves, J. Carpenter, C. Qi   +8 more
semanticscholar   +1 more source

Parent body thermal metamorphism of enstatite chondrites: Disentangling the effects of shock melting

Meteoritics &Planetary Science, EarlyView.
Abstract Enstatite chondrites (ECs) formed on at least two parent bodies, EH and EL. After the accretion of the EC parent bodies, EC material was subjected to varying degrees of parent body thermal metamorphism (measured by petrologic types 3–6), due to heat released by radioactive isotope decay.
Peter Mc Ardle, Rhian H. Jones, Patricia L. Clay, Romain Tartèse, Ray Burgess, Brian O'Driscoll, Eric W.G. Hellebrand, Jonathan Fellowes, Arthur Goodwin, Lewis Hughes   +9 more
wiley   +1 more source