Results 41 to 50 of about 2,119 (235)
The Astrophysical Journal, 2023 Dust coagulation in protoplanetary disks is not straightforward and is subject to several slowdown mechanisms, such as bouncing, fragmentation, and radial drift to the star.
Vitaly Akimkin +4 more
doaj +1 more source
RX J0123.4-7321 -- the story continues: major circumstellar disk loss and recovery [PDF]
, 2021 M. J. Coe +3 more
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Astronomische Nachrichten, Volume 345, Issue 8, October 2024.Abstract Astrophysical accretion discs that carry a significant mass compared with their central object are subject to the effect of self‐gravity. In the context of circumstellar discs, this can, for instance, cause fragmentation of the disc gas, and—under suitable conditions—lead to the direct formation of gas‐giant planets.
Oliver Gressel, Udo Ziegler
wiley +1 more source
Probing the Era of Giant Collisions: Millimeter Observations of the HD 166191 System
The Astrophysical JournalWe present nonsimultaneous Atacama Large Millimeter/submillimeter Array (ALMA) Band 7 and Submillimeter Array (SMA) observations of the HD 166191 disk, which was recently thought to have a collision in its terrestrial planet zone.
Kadin Worthen +7 more
doaj +1 more source
Natural Sciences, Volume 4, Issue 4, October 2024.Large free aromatic species, with up to 61 carbon atoms, were detected in grains of the Ryugu carbonaceous asteroid using ultra‐sensitive two‐step laser mass spectrometry. This discovery confirms the presence of large polycyclic aromatic hydrocarbons in the interstellar medium and provides new information on the formation and evolution of organic ...
Hassan Sabbah +3 more
wiley +1 more source
The Astronomical JournalThe presence of infrared excesses around stars directly correlates with spatially resolved imaging detections of circumstellar disks at both millimeter and optical/near-infrared wavelengths.
Justin Hom +10 more
doaj +1 more source
, 1999 33 pages, 12 figures, to be published in The Physics of Star Formation and Early Evolution II, C.J. Lada and N.D.
openaire +2 more sources
CIRCUMSTELLAR DEBRIS DISKS: DIAGNOSING THE UNSEEN PERTURBER [PDF]
The Astrophysical Journal, 2016 ABSTRACT The first indication of the presence of a circumstellar debris disk is usually the detection of excess infrared emission from the population of small dust grains orbiting the star. This dust is short-lived, requiring continual replenishment, and indicating that the disk must be excited by an unseen perturber.
Erika R. Nesvold +3 more
openaire +2 more sources
Tracing Planets in Circumstellar Disks [PDF]
Proceedings of the International Astronomical Union, 2005 We present simulations which demonstrate to which extent mid-infrared images and millimeter maps can be used to trace the location of giant planets in circumstellar disks. The most promising approach is to look for characteristic signatures in circumstellar disks caused by the interaction of giant planets with the disk.
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Processed and Unprocessed Ices in Circumstellar Disks [PDF]
Highlights of Astronomy, 2005 AbstractWe present 3-5 µm VLT-ISAAC spectroscopy showing the presence of methanol ices in edge-on disks of young embedded stars. Examples include the disks of L1489 IRS in Taurus and CRBR 2422.8-3423 in Ophiuchus, the last of which has the highest column density of solid CO known toward a YSO.
Pontoppidan, K. +3 more
openaire +2 more sources