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Constraints on Type Ib/c and GRB Progenitors
C. L. Fryer, P. A. Mazzali, J. Prochaska +14
Although there is strong support for the collapsar engine as the power source of long-duration gamma-ray bursts (GRBs), we still do not definitively know the progenitor of these ex…
Probing a GRB progenitor at a redshift of z=2: a comprehensive observing campaign of the afterglow of GRB 030226
S. Klose, J. Greiner, A. Rau +38
We report results from a comprehensive follow-up observing campaign of the afterglow of GRB 030226, including VLT spectroscopy, VLT polarimetry, and Chandra X-ray observations. In…
Discovery of the Near-IR Afterglow and of the Host of GRB 030528
A. Rau, J. Greiner, S. Klose +24
The rapid dissemination of an arcmin-sized HETE-2 localization of the long-duration X-ray flash GRB 030528 led to a ground-based multi-observatory follow-up campaign. We report the…
A very energetic supernova associated with the gamma-ray burst of 29 March 2003
Jens Hjorth, Jesper Sollerman, Palle Møller +24
Over the past five years evidence has mounted that long-duration (> 2 s) gamma-ray bursts (GRBs)--the most brilliant of all astronomical explosions--signal the collapse of massive…
On the formation of neon-enriched donor stars in ultracompact X-ray binaries
L. R. Yungelson, G. Nelemans, E. P. J. van den Heuvel
We study the formation of neon-enriched donor stars in ultracompact X-ray binaries (orbital periods P<80 min) and show that their progenitors have to be low-mass (0.3 - 0.4 solar m…
The evolution of naked helium stars with a neutron-star companion in close binary systems
J. D. M. Dewi, O. R. Pols, G. J. Savonije +1
The evolution of helium stars with masses of 1.5 - 6.7 M_sun in binary systems with a 1.4 M_sun neutron-star companion is presented. Such systems are assumed to be the remnants of…
The formation of black hole low-mass X-ray binaries: through case B or case C mass transfer?
G. Nelemans, E. P. J. van den Heuvel
The formation of low-mass X-ray binaries containing a rather massive (M >~ 7 \msun) black hole is problematic because in most recent stellar evolutionary calculations the immediate…
VLT spectroscopy of GRB 990510 and GRB 990712; probing the faint and bright end of the GRB host galaxy population
P. M. Vreeswijk, A. Fruchter, L. Kaper +15
We present time-resolved optical spectroscopy of the afterglows of the gamma-ray bursts GRB 990510 and GRB 990712. Through the identification of several absorption lines in the fir…
GRB990712: First Indication of Polarization Variability in a Gamma-ray Burst Afterglow
E. Rol, R. A. M. J. Wijers, P. M. Vreeswijk +9
We report the detection of significant polarization in the optical afterglow of GRB990712 on three instances 0.44, 0.70 and 1.45 days after the gamma-ray burst, with (P, theta) bei…
Formation of Millisecond Pulsars with Heavy White Dwarf Companions - Extreme Mass Transfer on Sub-Thermal Timescales
T. M. Tauris, E. P. J. van den Heuvel, G. J. Savonije
We have performed detailed numerical calculations of the non-conservative evolution of close X-ray binary systems with intermediate-mass (2.0-6.0 M_sun) donor stars and a 1.3 M_sun…
Circinus X-1: survivor of a highly asymmetric supernova
T. M. Tauris, R. P. Fender, E. P. J. van den Heuvel +2
We have analyzed the kinematical parameters of Cir X-1 to constrain the nature of its companion star, the eccentricity of the binary and the pre-supernova parameter space. We argue…
The origin of single radio pulsars
Simon Portegies Zwart, Edward van den Heuvel
By comparing relative rates of supernovae versus formation rates of single radio pulsars, recycled pulsars, binary pulsars and X-ray binaries we put strong limits on the progenitor…
Could 2S 0114+650 be a magnetar?
X. -D. Li, E. P. J. van den Heuvel
We investigate the spin evolution of the binary X-ray pulsar 2S 0114+650, which possesses the slowest known spin period of hours. We argue that, to interpret such long s…
Stability Criteria for Mass Transfer in Binary Stellar Evolution
G. E. Soberman, E. S. Phinney, E. P. J. van den Heuvel
The evolution of a binary star system by various analytic approximations of mass transfer is discussed, with particular attention payed to the stability of these processes against…
WRAY 977 (GX301-2): A HYPERGIANT WITH PULSAR COMPANION
L. Kaper, H. J. G. L. M. Lamers, E. Ruymaekers +2
Wray 977, the B supergiant companion of the X-ray pulsar GX301-2, should be classified as B1~Ia+, based on a comparison of its optical spectrum to that of zeta1 Sco, a well-known B…