Infrared Spectroscopy of U Equulei’s Warm Circumstellar Gas [PDF]
The Astrophysical Journal, 2005 21 pages incl.
Geballe, T. R. +3 more
openaire +2 more sources
NIKA2 observations around LBV stars Emission from stars and circumstellar material [PDF]
EPJ Web of Conferences, 2020 Luminous Blue Variable (LBV) stars are evolved massive objects, previous to core-collapse supernova. LBVs are characterized by photometric and spectroscopic variability, produced by strong and dense winds, mass-loss events and very intense UV radiation ...
Ricardo Rizzo J. +2 more
doaj +1 more source
Gas infall and possible circumstellar rotation in R Leonis [PDF]
Astronomy & Astrophysics, 2019 We present new interferometer molecular observations of R Leo taken at 1.2 mm with the Atacama Large Millimeter Array with an angular resolution up to ≃0.″026. These observations permitted us to resolve the innermost envelope of this star, which revealed a complex structure that involves extended continuum emission and molecular emission showing a non ...
J. P. Fonfría +6 more
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Takeout and Delivery: Erasing the Dusty Signature of Late-stage Terrestrial Planet Formation
The Astrophysical Journal, 2023 The formation of planets like Earth is expected to conclude with a series of late-stage giant impacts that generate warm dusty debris, the most anticipated visible signpost of terrestrial planet formation in progress.
Joan R. Najita, Scott J. Kenyon
doaj +1 more source
Hot Gas in the Circumstellar Bubble S308 [PDF]
The Astrophysical Journal, 2003 18 pages, 3 figures, to appear in the Astrophysical Journal, Dec 20 ...
Chu, Y. -H. +4 more
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Spectroscopic Evolution of Disintegrating Planetesimals: Minute to Month Variability in the Circumstellar Gas Associated with WD 1145+017 [PDF]
, 2016 With the recent discovery of transiting planetary material around WD 1145+017, a critical target has been identified that links the evolution of planetary systems with debris disks and their accretion onto the star.
S. Redfield +5 more
semanticscholar +1 more source
Seven white dwarfs with circumstellar gas discs II: Tracing the composition of exoplanetary building blocks [PDF]
Monthly notices of the Royal Astronomical SocietyThis second paper presents an in-depth analysis of the composition of the planetary material that has been accreted onto seven white dwarfs with circumstellar dust and gas emission discs with abundances reported in Paper I.
L. Rogers +10 more
semanticscholar +1 more source
Atomic Gas in Debris Discs [PDF]
, 2016 We have conducted a search for optical circumstellar absorption lines in the spectra of 16 debris disc host stars. None of the stars in our sample showed signs of emission line activity in either H$_{\alpha}$, Ca II or Na I, confirming their more evolved
Barlow, M. J. +3 more
core +2 more sources
Detailed modelling of the circumstellar molecular line emission of the S-type AGB star W Aquilae [PDF]
, 2014 S-type AGB stars have a C/O ratio which suggests that they are transition objects between oxygen-rich M-type stars and carbon-rich C-type stars. As such, their circumstellar compositions of gas and dust are thought to be sensitive to their precise C/O ...
Bergman, P. +7 more
core +2 more sources
Dust Rings in the Circumstellar Gas Disks [PDF]
Symposium - International Astronomical Union, 2004 In optically thin gas disks around young Vega-type stars, dust grains are exposed to the stellar radiation pressure and gas drag force. The combination of these forces pushes the grains away from the central star. Typically, 10–100 μm grains migrate outward to become concentrated at the outer edge of the gas disk.
Taku Takeuchi, Pawel Artymowicz
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