Exactly solvable gravitating perfect fluid solitons in (2 + 1) dimensions
Sign Up to like & getrecommendations! Published in 2018 at "Journal of High Energy Physics"
DOI: 10.1007/jhep07(2018)097
Abstract: A bstractThe Bogomolnyi-Prasad-Sommerfield (BPS) baby Skyrme model coupled to gravity is considered. We show that in an asymptotically flat space-time the model still possesses the BPS property, i.e., admits a BPS reduction to first order… read more here.
Keywords: space; flat space; mass radius; space time ... See more keywords
Relevance of the small frequency separation for asteroseismic stellar age, mass, and radius
Sign Up to like & getrecommendations! Published in 2020 at "Astronomy and Astrophysics"
DOI: 10.1051/0004-6361/201936353
Abstract: We performed a theoretical analysis on the relevance of the small frequency separation $\delta \nu$ in determining stellar ages, masses, and radii. We adopted the SCEPtER pipeline for low-mass stars, [0.7, 1.05] Msun. Synthetic stars… read more here.
Keywords: relevance small; age; mass radius; small frequency ... See more keywords
Complexity-free Vaidya-Tikekar model describing self-bound compact objects by gravitational decoupling
Sign Up to like & getrecommendations! Published in 2023 at "Physica Scripta"
DOI: 10.1088/1402-4896/acd442
Abstract: In this article, using gravitational decoupling under vanishing complexity condition, an anisotropic solution to spherically symmetric compact stars has been investigated. After obtaining the solution, a detailed physical analysis including thermodynamic parameters, mass-radius ratio, and… read more here.
Keywords: gravitational decoupling; complexity free; radius ratio; model ... See more keywords
Relation between Mass and Radius of Exoplanets Distinguished by their Density
Sign Up to like & getrecommendations! Published in 2023 at "Research in Astronomy and Astrophysics"
DOI: 10.1088/1674-4527/accbb1
Abstract: The formation of the solar system has been studied since the 18th century and received a boost in 1995 with the discovery of the first exoplanet, 51 Pegasi b. The investigations increased the number of… read more here.
Keywords: density; mass radius; ice gas; mass ... See more keywords
Accurate mass-radius ratios for Hyades white dwarfs
Sign Up to like & getrecommendations! Published in 2023 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stad1252
Abstract: We use the ESPRESSO spectrograph at the Very Large Telescope to measure velocity shifts and gravitational redshifts of eight bona fide Hyades white dwarfs, with an accuracy better than 1.5 percent. By comparing the gravitational… read more here.
Keywords: radius; white dwarfs; hyades white; radius ratios ... See more keywords
The cooling, mass and radius of the neutron star in EXO 0748-676 in quiescence with XMM-Newton
Sign Up to like & getrecommendations! Published in 2017 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stx1452
Abstract: We analyse four XMM-Newton observations of the neutron-star low-mass X-ray binary EXO 0748-676 in quiescence. We fit the spectra with an absorbed neutron-star atmosphere model, without the need for a high-energy (power-law) component; with a… read more here.
Keywords: neutron star; mass radius; star;
Testing the white dwarf mass-radius relationship with eclipsing binaries
Sign Up to like & getrecommendations! Published in 2017 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stx1522
Abstract: We present high-precision, model-independent, mass and radius measurements for 16 white dwarfs in detached eclipsing binaries and combine these with previously published data to test the theoretical white dwarf mass–radius relationship. We reach a mean… read more here.
Keywords: white dwarfs; radius; mass radius; per cent ... See more keywords
White dwarfs as a probe of dark energy
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review D"
DOI: 10.1103/physrevd.101.023001
Abstract: We investigate the radial density distribution of the dynamical dark energy inside the white dwarfs (WDs) and its possible impact on their intrinsic structure. The minimally-coupled dark energy with barotropic equation of state which has… read more here.
Keywords: white dwarfs; mass radius; dark energy; energy ... See more keywords
Effective interactions of hyperons and mass-radius relation of neutron stars
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review D"
DOI: 10.1103/physrevd.97.023010
Abstract: We examine the role of hyperons in a neutron star based on the relativistic mean field approach. For nuclear matter below 1.5 times the normal nuclear density we constrain the model parameters by using the… read more here.
Keywords: neutron; matter; mass radius; effective interactions ... See more keywords
New bound of the mass-to-radius ratio for electrically charged stars
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review D"
DOI: 10.1103/physrevd.98.124022
Abstract: Using a general solution-generating technique for electrically charged relativistic stars with spherical symmetry, we derive a new bound on the mass-radius ratio. This compactness bound is based on the already established bounds for uncharged interior… read more here.
Keywords: radius ratio; mass radius; new bound; bound mass ... See more keywords