Results 11 to 20 of about 5,169,486 (343)
Dust masses of young disks: constraining the initial solid reservoir for planet formation [PDF]
Astronomy & Astrophysics, 2020 What is the initial reservoir of mass available for making planets? This key question for planet formation got even more relevant when the measured masses of the Class II disks (1-3 Myr old) were found consistently smaller than what is needed for the ...
Ł. Tychoniec +9 more
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Connecting planet formation and astrochemistry [PDF]
Astronomy & Astrophysics, 2020 The chemical composition of planetary atmospheres has long been thought to store information regarding where and when a planet accretes its material. Predicting this chemical composition theoretically is a crucial step in linking observational studies to
A. Cridland +3 more
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Impact Induced Oxidation and Its Implications for Early Mars Climate
Geophysical Research Letters, 2023 H2 in a CO2 atmosphere may serve as a potential solution to the early Mars climate paradox, but its unknown sources cast doubts on the proposed mechanism. Impact cratering is an energetic process that may modify the surface redox budget.
Lu Pan, Zhengbin Deng, Martin Bizzarro
doaj +1 more source
Possible evidence of ongoing planet formation in AB Aurigae [PDF]
Astronomy & Astrophysics, 2020 Context. Planet formation is expected to take place in the first million years of a planetary system through various processes, which remain to be tested through observations. Aims. With the recent discovery, using ALMA, of two gaseous spiral arms inside
A. Boccaletti +10 more
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The Astrophysical Journal Letters, 2023 We present a U-corrected Pb–Pb age of 4566.19 ± 0.20 Ma (1.11 ± 0.26 Myr after t _0 ) for the moderately volatile element rich, andesitic meteorite Erg Chech 002 (EC002). Our Al–Mg isochron defines a ^26 Al/ ^27 Al initial ratio of (8.65 ± 0.09) × 10 ^−6
J. N. Connelly +5 more
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A tale of planet formation: from dust to planets [PDF]
Research in Astronomy and Astrophysics, 2020 The characterization of exoplanets and their birth protoplanetary disks has enormously advanced in the last decade. Benefitting from that, our global understanding of the planet formation processes has been substantially improved.
Beibei Liu, J. Ji
semanticscholar +1 more source
The Astrophysical Journal, 2023 In protostellar cores, sulfur species are effective probes for the energetic environments, such as shocked regions. With the majority of sulfur depleted on dust grains, sulfur-bearing molecules could be liberated back to gas phase by shocks associated ...
Ziwei E. Zhang +7 more
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A New Window into Planet Formation and Migration: Refractory-to-Volatile Elemental Ratios in Ultra-hot Jupiters [PDF]
, 2020 A primary goal of exoplanet characterization is to use a planet’s current composition to understand how that planet formed. For example, the C/O ratio has long been recognized as carrying important information on the chemistry of volatile species ...
J. Lothringer +5 more
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Planet formation by pebble accretion in ringed disks [PDF]
Astronomy & Astrophysics, 2020 Context. Pebble accretion is expected to be the dominant process for the formation of massive solid planets, such as the cores of giant planets and super-Earths.
A. Morbidelli
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A Case of Simultaneous Star and Planet Formation [PDF]
Astrophysical Journal, 2020 While it is widely accepted that planets are formed in protoplanetary disks, there is still much debate on when this process happens. In a few cases protoplanets have been directly imaged, but for the vast majority of systems, disk gaps and cavities—seen
F. Alves +7 more
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