Results 11 to 20 of about 1,969,695 (207)
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
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The Flash Ionization of the Circumstellar Gas of SN 1987A
AIP Conference Proceedings, 2007 The photons from the shock breakout of SN 1987A ionized the gas they encountered in less than a few hours. Twenty years later the recombining circumstellar gas is still glowing. Here we discuss what the analysis of this emission has revealed about the structure and properties of the circumstellar gas, as well as about the properties of the shock ...
Peter Lundqvist +2 more
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, 2014 From the very early observations completed in 1984, it was clear that some gas was present in the circumstellar environment. In particular the CaII lines were showing very strong absorption signatures never observed in the local ISM toward similarly nearby stars. From the comparison of the two first observations of these lines it became also clear that
Vidal-Majar, A.
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Fe I in the β Pictoris circumstellar gas disk [PDF]
Astronomy & Astrophysics, 2017 The young planetary system β Pictoris is surrounded by a circumstellar disk of dust and gas. Because both dust and gas have a lifetime shorter than the system age, they need to be replenished continuously. The gas composition is partly known, but its location and its origin are still a puzzle. The gas source could be the exocomets (or so-called falling
Vidal-Madjar, A. +7 more
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High-velocity Circumstellar Gas Orbiting a White Dwarf Star
The Astrophysical JournalNumerous white dwarf stars are known to be orbited by disks of gas and dust. To date, broad, ∼300 km s ^−1 wide, gaseous circumstellar absorption features have only been reported for the already iconic WD 1145+017, where one is witnessing the breakup of ...
B. Zuckerman +8 more
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Modelling and observations of molecules in discs around young stars [PDF]
, 2013 This thesis contains a study of molecules within circumstellar discs around young stars. Firstly, the chemistry of a disc around a young, Class 0 protostar is modelled.
Ilee, John David
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Planet–planet scattering in circumstellar gas disks [PDF]
Astronomy and Astrophysics, 2010 Astronomy and Astrophysics Letters, in ...
MARZARI, FRANCESCO +2 more
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The Circumstellar Gas of Phi Leonis in the UV [PDF]
The Astronomical Journal, 2021 Abstract HST UV spectra were obtained to study whether the φ Leo system has one or more stellar companions, as shown for the A-star dwarf, HR10, stellar pulsation, or transiting exocomets.
C. A. Grady +4 more
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The Imprint of Massive Stellar Evolution on Circumstellar Gas [PDF]
Symposium - International Astronomical Union, 1995 We follow the interaction of massive stars with their circumstellar media over their entire lifetimes by combining several numerical models. We use a stellar evolution model for 35 and 60 M⊙ stars (Langer et al. in preparation) as inner boundary conditions for one- and two-dimensional gas dynamical models of the circumstellar medium using ZEUS (Stone ...
Guillermo García-Segura +2 more
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Type-Ia supernovae in dense circumstellar gas [PDF]
Astronomy Letters, 2004 We propose a simple model for the bolometric light curve of type Ia supernova exploding in a dense circumstellar (CS) envelope to describe the light curves of supernovae 2002ic and 1997cy. The modeling shows that at the radius $\sim7\times10^{15}$ cm the density of CS envelopes around both supernovae is similar.
Chugai, N. N., Yungelson, L. R.
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