Results 61 to 70 of about 2,982 (223)
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
Imaging circumstellar disks around young stars by multi-aperture interferometry.
, 1992 International audienceTheoretical models of star formation predict the existence of a circumstellar disk around young stellar objects. In this paper, the authors present synthetic images of circumstellar accretion disks, computed from a model where the ...
Malbet, F., Bouvier, J., Monin, J. -L.
core +3 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
Molecular Spectroscopy of Planet-Forming Regions in Circumstellar Disks [PDF]
, 2009 Planets, now known to be common companions of nearby stars, are believed to originate in circumstellar disks - disks of gas and dust that form around collapsing protostars.
Salyk, Colette Vanessa
core +1 more source
Quadrant polarization parameters for the scattered light of circumstellar disks
, 2021 Context. Modern imaging polarimetry provides spatially resolved observations for many circumstellar disks and quantitative results for the measured polarization which can be used for comparisons with model calculations and for systematic studies of disk ...
H. M. Schmid, Schmid, Hans M.
core +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
Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.Abstract We present James Webb Space Telescope observations of the globular cluster NGC 6397 and use them to extend to infrared wavelengths the characterization of the cluster's entire white dwarf (WD) cooling sequence (CS). The data allows us to probe fundamental astrophysical WD properties and to search for evidence in their colors for (or against ...
L. R. Bedin +11 more
wiley +1 more source
Secret of Longevity: Protoplanetary Disks as a Source of Gas in Debris Disks
The Astrophysical JournalWhile protoplanetary disks (PPDs) are generally thought to disperse within several million years, recent observations have revealed gas in their older counterparts, debris disks.
Wataru Ooyama +4 more
doaj +1 more source
Observations of the Chemistry in Circumstellar Disks [PDF]
Symposium - International Astronomical Union, 2000 Circumstellar disks around classical T Tauri stars have still large amounts of primary molecular gas and dust, which may evolve to form planetary systems. Although it is the remnant of the parental cloud, the gas component shows significant chemical evolution.
A. Dutrey, S. Guilloteau, M. Guélin
openaire +1 more source
The deep eclipses of RW Aur revisited by long‐term photometric and spectroscopic monitoring
Astronomische Nachrichten, Volume 345, Issue 4, May 2024.Abstract RW Aurigae is a young stellar system containing a classical T Tauri star as the primary component. It shows deep, irregular dimmings, first detected in 2010. At the University Observatory Jena, we carried out optical follow‐up observations. We performed multiband (BVRI) photometry of the system with the Cassegrain‐Teleskop‐Kamera II and the ...
Oliver Lux +2 more
wiley +1 more source