Results 61 to 70 of about 17,073 (217)
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
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
, 2008 Context: the observations of the proplyds in the Orion Nebula Cluster, showing clear evidence of ongoing photoevaporation, have provided a clear proof about the role of the externally induced photoevaporation in the evolution of circumstellar disks.
Adams +36 more
core +1 more source
Testing Protoplanetary Disk Alignment In Young Binaries [PDF]
, 2004 We present K-band (2.2 mum) imaging polarimetry that resolves 19 T Tauri binary and multiple systems in the Taurus-Auriga and Scorpius-Ophiuchus star-forming regions. We observed systems with projected separations 1. 5 - 7. 2 (similar to200 - 1000 AU) in
Donar, A. X. +3 more
core +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.
openaire +1 more source
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
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
Tracing large-scale structures in circumstellar disks with ALMA
, 2012 Planets are supposed to form in circumstellar disks. The gravitational potential of a planet perturbs the disk and leads to characteristic structures, i.e. spiral waves and gaps, in the disk's density profile.
Klahr, Hubert H. +3 more
core +1 more source
A Comprehensive Study of the L1551 IRS 5 Binary System [PDF]
, 2002 We model the Class I source L1551 IRS 5, adopting a flattened infalling envelope surrounding a binary disk system and a circumbinary disk. With our composite model, we calculate self-consistently the spectral energy distribution of each component of the ...
Calvet, N. +4 more
core +3 more sources