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GAA - Grup d'Astronomia i Astrofísica: Recent submissions
Now showing items 13-24 of 377
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J0526+5934: A peculiar ultra-short-period double white dwarf
(EDP Sciences, 2024-06-13)
Article
Open AccessContext. Ultra-short-period compact binaries are important sources of gravitational waves. The class of short-period compact binaries includes, for example, the progenitors of type Ia supernovae and the progenitors of ... -
Kinematic origin of white dwarfs in the solar neighborhood
(EDP Sciences, 2024-07-01)
Article
Open AccessContext. White dwarfs are considered to be efficient cosmochronometers. Thanks to the recent space-borne mission Gaia, a nearly complete sample up to about 100 parsecs from the Sun has been compiled. However, the Galaxy, ... -
Interaction between the ejecta, the accretion disk, and the secondary star in the recurrent nova system U Sco
(EDP Sciences, 2025-01-01)
Article
Open AccessContext. Recurrent novae are, by definition, novae observed in outburst more than once. They exhibit notably short recurrence times between outbursts, ranging from 1 to about 100 yr. These short recurrence times require ... -
Nucleosynthesis in type Ia supernovae, classical novae, and type I X-Ray bursts. A primer on stellar explosions
(EPJ Web of Conferences, 2024)
Conference report
Open AccessNuclear astrophysics aims at unraveling the cosmic origins of chemical elements and the physical processes powering stars. It constitutes a truly multidisciplinary field, that integrates tools, advancements, and accomplishments ... -
Assessing the observability of deep meridional flow cells in the solar interior
(Institute of Physics (IOP), 2024-01-01)
Article
Open AccessMeridional circulation regulates the Sun's interior dynamics and magnetism. While it is well accepted that meridional flows are poleward at the Sun's surface, helioseismic observations have yet to provide a definitive ... -
White dwarf stars in the big data era
(2024-11-28)
Article
Open AccessWhite dwarf stars are the most common endpoint of stellar evolution. Therefore, these old, numerous and compact objects provide valuable information on the late stages of stellar evolution, the physics of dense plasma and ... -
Mass-loss, composition and observational signatures of stellar winds from x-ray bursts
(2024-11-29)
Article
Open AccessX-Ray bursts (XRBs) are powerful thermonuclear events on the surface of accreting neutron stars (NSs), which can synthesize intermediate-mass elements. Although the high surface gravity prevents an explosive ejection, a ... -
A JWST Project on 47 Tucanae. Overview, photometry, and early spectroscopic results of M dwarfs and observations of brown dwarfs
(Institute of Physics (IOP), 2024-04-01)
Article
Open AccessJames Webb Space Telescope (JWST) observations have been demonstrated to be efficient in detecting multiple stellar populations in globular clusters (GCs) in the low-mass regime of M dwarfs. We present an overview, and ... -
White dwarf random forest classification through Gaia spectral coefficients
(EDP Sciences, 2023-11)
Article
Open AccessContext. The third data release of Gaia has provided approximately 220 million low resolution spectra. Among these, about 100 000 correspond to white dwarfs. The magnitude of this quantity of data precludes the possibility ... -
3D hydrodynamic simulations of white dwarf–main-sequence star collisions – I. Head-on collisions
(Oxford University Press, 2024-11-01)
Article
Open AccessRecently inaugurated telescopes, such as the MeerKAT radio telescope and the upcoming Rubin Observatory Legacy Survey of Space and Time, will be able to detect millions of transient events in the night sky. Stellar collisions ... -
Hydrodynamical shear mixing in subsonic boundary layers and its role in the thermonuclear explosion of classical novae
(EDP Sciences, 2024-10-22)
Article
Open AccessContext. The transition zone between the white dwarf (WD) envelope and a circumstellar accretion disk in classical novae, the boundary layer, is a region of strong dissipation and intense vorticity. In this strongly sheared ... -
Thermonuclear 28P(p, y)29S reaction rate and astrophysical implication in ONe nova explosion
(EDP Sciences, 2024-07-01)
Article
Open AccessContext. An accurate 28P(p, ¿)29S reaction rate is crucial to defining the nucleosynthesis products of explosive hydrogen burning in ONe novae. Using the recently released nuclear mass of 29S, together with a shell model ...
