Results 1 to 10 of about 3,278,550 (239)
Modeling Circumstellar Gas Emission around a White Dwarf Using cloudy [PDF]
The Astronomical JournalThe chemical composition of an extrasolar planet is fundamental to its formation, evolution, and habitability. In this study, we explore a new way to measure the chemical composition of the building blocks of extrasolar planets by measuring the gas ...
Siyi Xu +11 more
doaj +5 more sources
Planet–planet scattering in circumstellar gas disks [PDF]
Astronomy and Astrophysics, 2010 Context. Hydrodynamical simulations of two giant planets embedded in a gaseous disk have shown that in case of a smooth convergent migration they end up trapped into a mean motion resonance.
F. Marzari, C. Baruteau, H. Scholl
semanticscholar +9 more sources
Fe I in the β Pictoris circumstellar gas disk [PDF]
Astronomy & Astrophysics, 2018 The young planetary system β Pictoris is surrounded by a debris disk of dust and gas. The gas source of this disk could be exocomets (or “falling and evaporating bodies”, FEBs), which produce refractory elements (Mg, Ca, Fe) through sublimation of dust ...
F. Kiefer +7 more
semanticscholar +7 more sources
Sustained Kozai–Lidov Oscillations in Misaligned Circumstellar Gas Disks [PDF]
The Astrophysical Journal Letters, 2020 A disk around one component of a binary star system with sufficiently high inclination can undergo Kozai–Lidov (KL) oscillations during which the disk inclination and disk eccentricity are exchanged.
Jeremy L. Smallwood +2 more
semanticscholar +4 more sources
Detection of nitrogen gas in the β Pictoris circumstellar disc [PDF]
Astronomy & Astrophysics, 2018 Context. The gas composition of the debris disc surrounding β Pictoris is rich in carbon and oxygen relative to solar abundances. Two possible scenarios have been proposed to explain this enrichment. The preferential production scenario suggests that the
P. Wilson +6 more
semanticscholar +7 more sources
Exocomets in the circumstellar gas disk of HD 172555 [PDF]
Astronomy & Astrophysics, 2014 The source HD 172555 is a young A7V star surrounded by a debris disk with a gaseous component. Here, we present the detection of variable absorption features detected simultaneously in the Ca II K and H doublet lines (at λ3933 A and λ3968 A).
F. Kiefer +5 more
semanticscholar +6 more sources
Dynamics of cold circumstellar gas in debris discs
Monthly Notices of the Royal Astronomical SocietyMounting observational evidence indicates that cold circumstellar gas is present in debris disc systems. This work focuses on various dynamical processes that debris disc gas may undergo.
C. Cui, S. Marino, Q. Kral, H. Latter
semanticscholar +6 more sources
Debris Disks around Nearby Stars with Circumstellar Gas [PDF]
The Astrophysical Journal, 2007 We conducted a survey for infrared excess emission from 16 nearby main-sequence shell stars using the Multiband Imaging Photometer for Spitzer (MIPS) on the Spitzer Space Telescope.
A. Roberge, A. Weinberger
semanticscholar +4 more sources
VOLATILE-RICH CIRCUMSTELLAR GAS IN THE UNUSUAL 49 CETI DEBRIS DISK [PDF]
The Astrophysical Journal, 2014 We present Hubble Space Telescope Space Telescope Imaging Spectrograph far-UV spectra of the edge-on disk around 49 Ceti, one of the very few debris disks showing submillimeter CO emission. Many atomic absorption lines are present in the spectra, most of
A. Roberge +4 more
semanticscholar +4 more sources
Generation of a circumstellar gas disc by hot Jupiter WASP-12b [PDF]
Monthly Notices of the Royal Astronomical Society, 2018 Observations of transiting extra-solar planets provide rich sources of data for probing the in-system environment. In the WASP-12 system, a broad depression in the usually-bright MgII h&k lines has been observed, in addition to atmospheric escape from ...
Alex Debrecht +5 more
semanticscholar +4 more sources