Results 71 to 80 of about 11,561 (252)

Origin of the CC-NC isotopic dichotomy in early planetesimals (iron meteorite parent bodies) [PDF]

, 2022
Alessandro Morbidelli, Kévin Baillié, Konstantin Batygin, S. Charnoz, T. Guillot, D. C. Rubie, T. Kleine   +6 more
openalex   +1 more source

TWO BEYOND-PRIMITIVE EXTRASOLAR PLANETESIMALS [PDF]

The Astrophysical Journal, 2013
Using the Cosmic Origins Spectrograph onboard the Hubble Space Telescope, we have obtained high-resolution ultraviolet observations of GD 362 and PG 1225-079, two helium-dominated, externally-polluted white dwarfs. We determined or placed useful upper limits on the abundances of two key volatile elements, carbon and sulfur, in both stars; we also ...
Xu, S., Jura, M., Klein, B., Koester, D., Zuckerman, B.   +4 more
openaire   +2 more sources

Sound Velocities and Structural Transitions of Endmember and Fe, Al, Mg, Ti‐Bearing CaSiO3 Glasses Up to 23 GPa

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 2, February 2026.
Abstract The study of silicate glasses is important to understand the physical and chemical properties of silicate melts under high‐pressure conditions relevant to planetary interiors. We conducted in situ Brillouin spectroscopy measurements on two endmember, low‐impurity CaSiO3 glasses and one Fe, Al, Mg, Ti‐bearing CaSiO3 glass up to 23 GPa.
Wenhao Su, Wen‐Yi Zhou, Jiasen Hu, Ming Hao, Anne Pommier, Jin S. Zhang   +5 more
wiley   +1 more source

The missing large impact craters on Ceres

Nature Communications, 2016
Studying craters on atmosphere-less bodies can unlock information about planetesimal histories. Here, Marchi et al. present results from the NASA Dawn mission to Ceres showing that craters >100–150 km in size are largely absent, and find that Ceres ...
S. Marchi, A. I. Ermakov, C. A. Raymond, R. R. Fu, D. P. O’Brien, M. T. Bland, E. Ammannito, M. C. De Sanctis, T. Bowling, P. Schenk, J. E. C. Scully, D. L. Buczkowski, D. A. Williams, H. Hiesinger, C. T. Russell   +14 more
doaj   +1 more source

The Heavy Element Composition of Disk Instability Planets Can Range From Sub- to Super-Nebular

, 2011
Transit surveys combined with Doppler data have revealed a class of gas giant planets that are massive and highly enriched in heavy elements (e.g., HD149026b, GJ436b, and HAT-P-20b).
Aaron C. Boley, Bakos, Baraffe, Boley, Boley, Boley, Boley, Boley, Boley, Boss, Boss, Boss, Boss, Burrows, Cai, Cai, Cha, D'Angelo, Dodson-Robinson, Durisen, Gammie, Haghighipour, Haghighipour, Helled, Ikoma, Johansen, Johnson, Kratter, Li, Matthew J. Payne, Mayer, Mayer, Nayakshin, Nelson, Pickett, Rafikov, Ravit Helled, Rice, Safronov, Vorobyov, Vorobyov, Xie, Zhu   +42 more
core   +1 more source

Density of Sodium Aluminosilicate Melts Along the NaAlSiO4‐NaAlSi3O8 Join at High Pressure: In‐Situ Measurements and Re‐Calibration of a Modified Hard‐Sphere Equation of State For Silicate Melts

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 2, February 2026.
Abstract Silicate melts play a crucial role in planetary differentiation. The density contrast between silicate melts and the surrounding solid residue exerts a primary control on many magmatic processes. However, direct measurements of the density of silicate melts at high pressure (P) and temperature (T) conditions remain challenging, particularly ...
Man Xu, Zhicheng Jing, James A. Van Orman, Qingyang Hu, Qi Chen, Tony Yu, Yanbin Wang   +6 more
wiley   +1 more source

Effects of stellar X-ray photoevaporation on planetesimal formation via the streaming instability

Astronomy & Astrophysics
Context. The formation of planetesimals via the streaming instability (SI) is a crucial step in planet formation, yet its triggering conditions and efficiency are highly sensitive to both disk properties and specific evolutionary processes. Aims.
Ying Xuchu, Liu Beibei, Yang Haifeng, Drążkowska Joanna, Stammler Sebastian M., Zhu Zhaohuan, Eriksson Linn E.J., Deng Hongping, Liu Bin, Chen Ping   +9 more
doaj   +1 more source

WATER FRACTIONS IN EXTRASOLAR PLANETESIMALS [PDF]

The Astronomical Journal, 2011
Accepted for publication in the Astronomical Journal, 22 pages, 4 figures, 1 ...
Jura, M., Xu, S.
openaire   +2 more sources

Microimaging Spectroscopy of Carbonaceous Chondrites and Comparison to the Spectral Diversity of Asteroids

Journal of Geophysical Research: Planets, Volume 131, Issue 2, February 2026.
Abstract Primitive asteroids and carbonaceous chondrites (CCs) record the history of processes in the early solar system. Visible and shortwave infrared (VSWIR) spectroscopy of primitive asteroids and bulk‐powdered CCs has identified shared spectral features suggestive of shared parent body origins.
S. A. Parra, R. N. Greenberger, B. L. Ehlmann   +2 more
wiley   +1 more source

ELemental abundances of Planets and brown dwarfs Imaged around Stars (ELPIS). I. Potential Metal Enrichment of the Exoplanet AF Lep b and a Novel Retrieval Approach for Cloudy Self-luminous Atmospheres

The Astronomical Journal, 2023
AF Lep A+b is a remarkable planetary system hosting a gas-giant planet that has the lowest dynamical mass among directly imaged exoplanets. We present an in-depth analysis of the atmospheric composition of the star and planet to probe the planet’s ...
Zhoujian Zhang, Paul Mollière, Keith Hawkins, Catherine Manea, Jonathan J. Fortney, Caroline V. Morley, Andrew Skemer, Mark S. Marley, Brendan P. Bowler, Aarynn L. Carter, Kyle Franson, Zachary G. Maas, Christopher Sneden   +12 more
doaj   +1 more source