62 citations · 628 across the 25 of their papers we have counts for
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X-Shooting ULLYSES: massive stars at low metallicity: XII. The clumped winds of O-type (super)giants in the Large Magellanic Cloud
Sarah A. Brands, Frank Backs, Alex de Koter +23
Mass loss governs the evolution of massive stars and shapes the stellar surroundings. To quantify the impact of the stellar winds we need to know the exact mass-loss rates; however…
X-Shooting ULLYSES: massive stars at low metallicity. I. Project Description
Jorick S. Vink, A. Mehner, P. A. Crowther +78
Observations of individual massive stars, super-luminous supernovae, gamma-ray bursts, and gravitational-wave events involving spectacular black-hole mergers, indicate that the low…
X-Shooting ULLYSES: Massive stars at low metallicity. III. Terminal wind speeds of ULLYSES massive stars
C. Hawcroft, H. Sana, L. Mahy +26
The winds of massive stars have an impact on stellar evolution and on the surrounding medium. The maximum speed reached by these outflows, the terminal wind speed, is a global wind…
Discrete Absorption Components from 3-D spot models of hot star winds
F. A. Driessen, N. D. Kee
The winds of hot, massive stars are variable from processes happening on both large and small spatial scales. A particular case of such wind variability is 'discrete-absorption com…
Method and new tabulations for flux-weighted line-opacity and radiation line-force in supersonic media
L. G. Poniatowski, N. D. Kee, J. O. Sundqvist +7
In accelerating and supersonic media, the interaction of photons with spectral lines can be of ultimate importance. However, fully accounting for such line forces currently can onl…
First 3D Radiation-Hydrodynamic Simulations of Wolf-Rayet Winds
N. Moens, L. G. Poniatowski, L. Hennicker +3
Classical Wolf Rayet (WR) stars are direct supernova progenitors undergoing vigorous mass-loss. Understanding the dense and fast outflows of such WR stars is thus crucial for under…
Binary-object spectral-synthesis in 3D (BOSS-3D) -- Modelling H-alpha emission in the enigmatic multiple system LB-1
L. Hennicker, N. D. Kee, T. Shenar +5
Context: To quantitatively decode the information stored within an observed spectrum, detailed modelling of the physical state and accurate radiative transfer solution schemes are…
Simulations of the line-driven instability in magnetic hot star winds
F. A. Driessen, N. D. Kee, J. O. Sundqvist
Line-driven winds of hot, luminous stars are intrinsically unstable due to the line-deshadowing instability (LDI). In non-magnetic hot stars, the LDI leads to the formation of an i…
Shock-heated radiation-driven outflows as a solution to the weak-wind problem of late O-type stars
C. Lagae, F. A. Driessen, L. Hennicker +2
Context. Radiation-driven mass loss is key to our understanding of massive-star evolution. However, for low-luminosity O-type stars there are big discrepancies between theoreticall…
Analytic, dust-independent mass-loss rates for red supergiant winds initiated by turbulent pressure
N. D. Kee, J. O. Sundqvist, L. Decin +2
Context. Red supergiants are observed to undergo vigorous mass-loss. However, to date, no theoretical model has succeeded in explaining the origins of these objects' winds. This st…
Dynamically inflated wind models of classical Wolf-Rayet stars
L. G. Poniatowski, J. O. Sundqvist, N. D. Kee +6
Vigorous mass loss in the classical Wolf-Rayet (WR) phase is important for the late evolution and final fate of massive stars. We develop spherically symmetric time-dependent and s…
Line-drag damping of Alfvén waves in radiatively driven winds of magnetic massive stars
F. A. Driessen, N. D. Kee, J. O. Sundqvist +1
Line-driven stellar winds from massive (OB) stars are subject to a strong line-deshadowing instability. Recently, spectropolarimetric surveys have collected ample evidence that a s…
A Detailed View of the Circumstellar Environment and Disk of the Forming O-star AFGL 4176
K. G. Johnston, M. G. Hoare, H. Beuther +5
We present a detailed analysis of the disk and circumstellar environment of the forming O-type star AFGL 4176 mm1, placing results from the Atacama Large Millimeter/submillimeter A…
Spiral arms and instability within the AFGL 4176 mm1 disc
K. G. Johnston, M. G. Hoare, H. Beuther +7
We present high-resolution (30 mas or 130 au at 4.2 kpc) Atacama Large Millimeter/submillimeter Array observations at 1.2 mm of the disc around the forming O-type star AFGL 4176 mm…
A 3D short-characteristics method for continuum and line scattering problems in the winds of hot stars
L. Hennicker, J. Puls, N. D. Kee +1
Context: Knowledge about hot, massive stars is usually inferred from quantitative spectroscopy. To analyse non-spherical phenomena, the existing 1D codes must be extended to higher…
Theoretical wind clumping predictions of OB supergiants from line-driven instability simulations across the bi-stability jump
F. A. Driessen, J. O. Sundqvist, N. D. Kee
(Abridged) The behaviour of mass loss across bi-stability jump is a key uncertainty in models of massive stars. While an increase in mass loss is theoretically predicted, this has…
Line-driven ablation of circumstellar discs: IV. The role of disc ablation in massive star formation and its contribution to the stellar upper mass limit
N. D. Kee, R. Kuiper
Radiative feedback from luminous, massive stars during their formation is a key process in moderating accretion onto the stellar object. In the prior papers in this series, we show…
Line-driven ablation of circumstellar discs: III. Accounting for and analyzing the effects of continuum optical depth
Nathaniel Kee, Stan Owocki, Rolf Kuiper
In studying the formation of massive stars, it is essential to consider the strong radiative feedback on the stars' natal environments from their high luminosities ($10^4 \sim 10^6…
3D radiative transfer: Continuum and line scattering in non-spherical winds from OB stars
L. Hennicker, J. Puls, N. D. Kee +1
Context: State of the art quantitative spectroscopy of OB-stars compares synthetic spectra (calculated by means of 1D, spherically symmetric computer codes) with observations. Cert…
Disruption of circumstellar discs by large-scale stellar magnetic fields
Asif ud-Doula, Stanley Owocki, Nathaniel Kee
Spectropolarimetric surveys reveal that 8-10\% of OBA stars harbor large-scale magnetic fields, but thus far no such fields have been detected in any classical Be stars. Motivated…
Line-driven ablation of circumstellar discs: II. Analyzing the role of multiple resonances
Nathaniel Kee, Stan Owocki, Rolf Kuiper
We extend our previous study of radiative ablation of circumstellar disks by line-scattering of the star's radiation, accounting now for the effect of multiple line resonances off…
Line-driven ablation of circumstellar disks: I. Optically thin decretion disks of classical Oe/Be stars
N. D. Kee, S. P. Owocki, J. O. Sundqvist
The extreme luminosities of hot, massive stars drive strong stellar winds through UV line-scattering. For OB stars with an orbiting circumstellar disk, we explore the effect of suc…
Radiative Ablation of Disks Around Massive Stars
N. D. Kee
Hot, massive stars (spectral types O and B) have extreme luminosities () that drive strong stellar winds through UV line-scattering. Some massive stars also hav…
Pulsational Mass Ejection in Be Star Disks
Nathaniel Kee, Stan Owocki, Richard Townsend +1
This work explores a Pulsationally Driven Orbital Mass Ejection (PDOME) model for the launching of Classical Be star disks. Under this model, a combination of rapid rotation and no…