-
301
Understanding sub-stellar populations using wide-field infrared surveys
Published 2014“…We also present some exciting results from our ongoing search for wide companions to this sample, that has so far revealed an M4-T8.5 binary system at ∼12 parsecs and also the first ever Tdwarf-white dwarf binary system. The T dwarfs in these binaries have their properties constrained by the primary object and are thus benchmark objects that are already testing the predictions of theoretical model atmospheres.…”
Get full text
Article -
302
The progenitors of type Ia supernovae: what can we learn from the circumstellar medium around single degenerate systems?
Published 2013“…<p>While the progenitors of Type Ia supernovae (SNe Ia) have long been thought to be thermonuclear explosions of white dwarf stars, what triggers the explosion are still a topic of debate. …”
Thesis -
303
Evolution of intermediate-mass X-ray binaries driven by magnetic braking of Ap/Bp stars: I. Ultracompact X-ray binaries
Published 2016“…It is generally believed that ultracompact X-ray binaries (UCXBs) evolved from binaries consisting of a neutron star accreting from a low-mass white dwarf(WD) or helium star where mass transfer is driven by gravitational radiation. …”
Journal article -
304
Global finite-energy solutions of the compressible Euler–Poisson equations for general pressure laws with large initial data of spherical symmetry
Published 2024“…We are concerned with global finite-energy solutions of the three-dimensional compressible Euler–Poisson equations with gravitational potential and general pressure law, especially including the constitutive equation of white dwarf stars. In this paper, we construct global finite-energy solutions of the Cauchy problem for the Euler– Poisson equations with large initial data of spherical symmetry as the inviscid limit of the solutions of the corresponding Cauchy problem for the compressible Navier– Stokes–Poisson equations. …”
Journal article -
305
A New 626 s Periodic X-ray Source in the Direction of the Galactic Center
Published 2010“…In the latter case, the modulation would be the spin period of a magnetic white dwarf. However, we find no evidence for absorption dips over the 626 s period, a low temperature black body spectral component, or Fe Kalpha emission lines. …”
Journal article -
306
Tidal disruption events and gravitational waves from intermediate-mass black holes in evolving globular clusters across space and time
Published 2018“…We compute the fraction of GCs still hosting intermediate-mass black holes (IMBHs) at a given redshift in early and late -type galaxies of different masses and sizes, and the corresponding rate of tidal disruption events (TDEs), both main-sequence (MS) and white dwarf (WD) stars. We find that the integrated TDE rate for the entire GC population can exceed the corresponding rate in a given galactic nucleus and that ~90% of the TDEs reside in GCs within a maximum radius of ~2–15 kpc from the host galaxy's center. …”
Journal article -
307
Bow-shocks, nova shells, disc winds and tilted discs: the Nova-Like V341 Ara Has It All
Published 2021“…Their radial velocities suggest a high mass ratio, which in turn implies an unusually low white-dwarf mass. We also constrain the wind mass-loss rate of the system from the spatially resolved [O III] emission produced in the bow shock; this can be used to test and calibrate accretion disc wind models. …”
Journal article -
308
High-velocity features: a ubiquitous property of Type Ia Supernovae
Published 2005“…In this scenario, the high incidence of HVFs suggests that a thick disk and/or a high-density companion wind surrounds the exploding white dwarf, as may be the case in single degenerate systems. …”
Journal article -
309
Discovery of jets launched by classical nova eruptions
Published 2021“…Classical novae are stellar explosions that occur on the surface of white dwarfs in close binary systems. This thesis presents time-domain spec- troscopy of four recent eruptions in the Milky Way, carried out by the Global Jet Watch telescopes. …”
Thesis -
310
Simplified 3D GCM modelling of the irradiated brown dwarf WD 0137−349B
Published 2020“…White dwarf–brown dwarf short-period binaries (Porb ≲ 2 h) are some of the most extreme irradiated atmospheric environments known. …”
Journal article -
311
New hot subdwarf variables from the EC survey
Published 2019“…The sdOV star, EC 03089–6421 is found to have Teff = 52 000 ± 3000 K and log g = 5.6 ± 0.2, and with a mass ∼0.1 M could be a progenitor to an extremely low-mass white dwarf.…”
Journal article -
312
A statistical analysis of circumstellar material in Type Ia supernovae
Published 2013“…The origin of this material is controversial, but the simplest explanation is that it results from previous mass loss in a system containing a white dwarf and a non-degenerate companion star. We present new single-epoch intermediate-resolution spectra of 17 low-redshift SNe Ia taken with XShooter on the ESO Very Large Telescope. …”
Journal article -
313
The high energy X-ray probe (HEX-P): Resolving the nature of Sgr A* flares, compact object binaries and diffuse X-ray emission in the Galactic center and beyond
Published 2024-01-01“…HEX-P will be uniquely equipped to explore a variety of major topics in Galactic astrophysics, allowing us to 1) investigate broad-band properties of X-ray flares emitted from the supermassive black hole (BH) at Sgr A* and probe the associated particle acceleration and emission mechanisms; 2) identify hard X-ray sources detected by NuSTAR and determine X-ray point source populations in different regions and luminosity ranges; 3) determine the distribution of compact object binaries in the nuclear star cluster and the composition of the Galactic Ridge X-ray emission; 4) identify X-ray transients and measure fundamental parameters such as black hole spin; 5) find hidden pulsars in the Galactic Center; 6) search for BH–OB binaries and hard X-ray flares from young stellar objects in young massive clusters; 7) measure white dwarf (WD) masses of magnetic CVs to deepen our understanding of CV evolution and the origin of white dwarf magnetic fields; 8) explore primary particle accelerators in the GC in synergy with future TeV and neutrino observatories; 9) map out cosmic-ray distributions by observing non-thermal X-ray filaments; 10) explore past X-ray outbursts from Sgr A* through X-ray reflection components from giant molecular clouds.…”
Get full text
Article -
314
The Missing Symbiotic Stars: A Joint Analysis with Gaia, GALEX, and XMM-Newton Data
Published 2024-01-01“…The existence of a population of low-accretion-rate symbiotic stars (SySts), consisting of a giant star and a compact companion (usually a white dwarf), has been proposed recently. However, their population has not been fully understood. …”
Get full text
Article -
315
On Variation Mechanisms in Recurrent Nova IM Normae
Published 2022-09-01“…One way is as alternating eclipses of and by the disk that surrounds this cataclysmic variable’s accreting white dwarf, rather than purely a succession of disk-by-star eclipses. …”
Get full text
Article -
316
How does the carbon fusion reaction happen in stars?
Published 2013-09-01“…Due to its compli-cated reaction mechanism, there is great uncertainty in the reaction rate which limits our understanding of vari-ous stellar objects, such as explosions on the surface of neutron stars, white dwarf (type Ia) supernovae, and massive stellar evolution. …”
Get full text
Article -
317
Hunting for Cold Exoplanets via Microlensing
Published 2023-08-01“…Microlensing has discovered the first cold super-Earth, and the first Jupiter planet orbiting a white dwarf. It also detected a number of Earth, Super-Earth, Neptune, Saturn, Jupiter, super-Jupiter orbiting main sequence stars in the mass range $0.08-1 M_\odot $. …”
Get full text
Article -
318
Multifilter Time-series Observations of Eleven Blue Short-period ATLAS Variable Stars
Published 2023-01-01“…In two of these latter systems, the primary stars are also sdB stars, while two have white-dwarf components. In all eight of these binaries the companion stars are probably M dwarfs. …”
Get full text
Article -
319
NICER Discovery of Millisecond X-Ray Pulsations and an Ultracompact Orbit in IGR J17494-3030
Published 2022“…The mass donor is most likely a ≃0.02M⊙ finiteentropy white dwarf composed of He or C/O. The fractional rms pulsed amplitude is 7.4%, and the soft (1-3 keV) X-ray pulse profile contains a significant second harmonic. …”
Get full text
Article -
320
NICER Discovery of Millisecond X-Ray Pulsations and an Ultracompact Orbit in IGR J17494-3030
Published 2022“…The mass donor is most likely a ≃0.02M⊙ finiteentropy white dwarf composed of He or C/O. The fractional rms pulsed amplitude is 7.4%, and the soft (1-3 keV) X-ray pulse profile contains a significant second harmonic. …”
Get full text
Article