The origin of the high velocity circumstellar gas around SN 1998S [PDF]
Monthly Notices of the Royal Astronomical Society, 2001 Modelling of high resolution Balmer line profiles in the early-time spectra ofSN 1998S shows that the inferred fast (≈400 km s −1 ) circumstellar (CS) gas ondays 23 and 42 post-explosion is confined to a narrow, negative velocity gradient shelljust above ...
N. Chugai +5 more
semanticscholar +4 more sources
Origin of compact exoplanetary systems during disk infall [PDF]
Nature CommunicationsExoplanetary systems that contain multiple planets on short-period orbits appear to be prevalent in the current observed exoplanetary population, yet the processes that give rise to such configurations remain poorly understood.
Raluca Rufu, Robin M. Canup
doaj +2 more sources
Insights Into the Gas‐Phase Structure and Internal Dynamics of Diphenylsilane: A Broadband Rotational Spectroscopy Study [PDF]
ChemPhysChem, Volume 26, Issue 2, January 14, 2025.The structure of diphenylsilane could be determined from the rotational spectra of all its singly substituted heavy atom isotopologues. A comparison with its oxygen analogue diphenylether revealed some interesting differences in the internal dynamics as well as in the gas‐phase structure.
Gayatri Batra, Melanie Schnell
wiley +2 more sources
Seven white dwarfs with circumstellar gas discs I: White Dwarf parameters and accreted planetary abundances [PDF]
Monthly notices of the Royal Astronomical Society, 2023 Observations of planetary material polluting the atmospheres of white dwarfs are an important probe of the bulk composition of exoplanetary material.
L. Rogers +11 more
semanticscholar +1 more source
Recurring Planetary Debris Transits and Circumstellar Gas around White Dwarf ZTF J0328–1219 [PDF]
, 2021 We present follow-up photometry and spectroscopy of ZTF J0328−1219, strengthening its status as a white dwarf exhibiting transiting planetary debris. Using TESS and Zwicky Transient Facility photometry, along with follow-up high-speed photometry from ...
Z. Vanderbosch +16 more
semanticscholar +1 more source
Meridional Circulation of Dust and Gas in the Circumstellar Disk: Delivery of Solids onto the Circumplanetary Region [PDF]
Astrophysical Journal, 2021 We carried out 3D dust + gas radiative hydrodynamic simulations of forming planets. We investigated a parameter grid of a Neptune-mass, a Saturn-mass, a Jupiter-mass, and a five-Jupiter-mass planet at 5.2, 30, and 50 au distance from their star. We found
J. Szulágyi, F. Binkert, C. Surville
semanticscholar +1 more source
A Characterization of the Circumstellar Gas of WD 1124−293 Using Cloudy
Astrophysical Journal, 2021 Between 30% and 50% of white dwarfs (WDs) show heavy elements in their atmospheres. This pollution is thought to arise from the accretion of planetesimals perturbed by outer planet(s) to within the WD’s tidal disruption radius.
A. Steele +4 more
semanticscholar +1 more source
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.
openaire +2 more sources
AGB Stars and Their Circumstellar Envelopes. I. the VULCAN Code
Universe, 2021 The interplay between AGB interiors and their outermost layers, where molecules and dust form, is a problem of high complexity. As a consequence, physical processes like mass loss, which depend on the chemistry of the circumstellar envelope, are often ...
Sergio Cristallo +4 more
doaj +1 more source
Simulations of Dynamical Gas–Dust Circumstellar Disks: Going Beyond the Epstein Regime [PDF]
Astronomy reports (Print), 2020 —In circumstellar disks, the size of dust particles varies from submicron to several centimeters, while planetesimals have sizes of hundreds of kilometers.
O. Stoyanovskaya +4 more
semanticscholar +1 more source