698 citations · 1.6k across the 13 of their papers we have counts for
13 papers
Formation of Double Neutron Star Systems
T. M. Tauris, M. Kramer, P. C. C. Freire +11
Double neutron star (DNS) systems represent extreme physical objects and the endpoint of an exotic journey of stellar evolution and binary interactions. Large numbers of DNS system…
The metallicity dependence of envelope inflation in massive stars
D. Sanyal, N. Langer, D. Szécsi +2
Recently it has been found that models of massive stars reach the Eddington limit in their interior, which leads to dilute extended envelopes. We perform a comparative study of the…
Metallicity dependence of turbulent pressure and macroturbulence in stellar envelopes
Luca Grassitelli, Luca Fossati, Norbert Langer +3
Macroturbulence, introduced as a fudge to reproduce the width and shape of stellar absorption lines, reflects gas motions in stellar atmospheres. While in cool stars, it is thought…
Diagnostic of the unstable envelopes of Wolf-Rayet stars
Luca Grassitelli, Andre-Nicolas Chene', Debashis Sanyal +4
The envelopes of stars near the Eddington limit are prone to various instabilities. A high Eddington factor in connection with the Fe opacity peak leads to convective instability,…
Relating turbulent pressure and macroturbulence across the HR diagram with a possible link to γ-Dor stars
Luca Grassitelli, Luca Fossati, Norbert Langer +3
A significant fraction of the envelope of low- and intermediate-mass stars is unstable to convection, leading to sub-surface turbulent motion. Here, we consider and include the eff…
Envelope inflation in Wolf-Rayet stars and extended supernova shock breakout signals
Debashis Sanyal, Takashi J. Moriya, Norbert Langer
Massive, luminous stars reaching the Eddington limit in their interiors develop very dilute, extended envelopes. This effect is called envelope inflation. If the progenitors of Typ…
Observational consequences of turbulent pressure in the envelopes of massive stars
Luca Grassitelli, Luca Fossati, Sergio Simon-Diaz +3
The major mass fraction of the envelope of hot luminous stars is radiatively stable. However, the partial ionisation of hydrogen, helium and iron gives rise to extended sub-surface…
Massive stars on the verge of exploding: the properties of oxygen sequence Wolf-Rayet stars
F. Tramper, S. M. Straal, D. Sanyal +7
Context. Oxygen sequence Wolf-Rayet (WO) stars represent a very rare stage in the evolution of massive stars. Their spectra show strong emission lines of helium-burning products, i…
Low-metallicity massive single stars with rotation. Evolutionary models applicable to I Zwicky 18
D. Szécsi, N. Langer, S. -C. Yoon +4
Massive rotating single stars with an initial metal composition appropriate for the dwarf galaxy I Zw 18 ([Fe/H]=1.7) are modelled during hydrogen burning for initial masses of…
Massive main sequence stars evolving at the Eddington limit
Debashis Sanyal, Luca Grassitelli, Norbert Langer +1
The evolution of massive stars even on the main sequence is not yet well understood. Due to the steep mass-luminosity relation, massive main sequence stars become very luminous. Th…
Extended supernova shock breakout signals from inflated stellar envelopes
Takashi J. Moriya, Debashis Sanyal, Norbert Langer
Stars close to the Eddington luminosity can have large low-density inflated envelopes. We show that the rise times of shock breakout signals from supernovae can be extended signifi…
The evolution of rotating very massive stars with LMC composition
K. Köhler, N. Langer, A. de Koter +8
We present a dense model grid with tailored input chemical composition appropriate for the Large Magellanic Cloud. We use a one-dimensional hydrodynamic stellar evolution code, whi…
Evolution towards and beyond accretion-induced collapse of massive white dwarfs and formation of millisecond pulsars
Thomas M. Tauris, Debashis Sanyal, Sung-Chul Yoon +1
Millisecond pulsars (MSPs) are generally believed to be old neutron stars (NSs), formed via type Ib/c core-collapse supernovae (SNe), which have been spun up to high rotation rates…