Zobrazeno 1 - 10
of 13
pro vyhledávání: '"M E, Caplan"'
Diffusion coefficients are essential microphysics input for modeling white dwarf evolution, as they impact phase separation at crystallization and sedimentary heat sources. Present schemes for computing diffusion coefficients are accurate at weak cou
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e79484bb58da5d5ff8be17e02492b825
http://arxiv.org/abs/2203.13383
http://arxiv.org/abs/2203.13383
Type-Ia supernovae (SN Ia) are powerful stellar explosions that provide important distance indicators in cosmology. Recently, we proposed a new SN Ia mechanism that involves a nuclear fission chain-reaction in an isolated white dwarf [PRL 126, 131101
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::862b1358e6c70ecf9cc007fa7bed6a4b
http://arxiv.org/abs/2109.14714
http://arxiv.org/abs/2109.14714
Publikováno v:
Caplan, M E, Freeman, I F, Horowitz, C J, Cumming, A & Bellinger, E P 2021, ' Cooling Delays from Iron Sedimentation and Iron Inner Cores in White Dwarfs ', Astrophysical Journal Letters, vol. 919, no. 1, L12 . https://doi.org/10.3847/2041-8213/ac1f99
Do white dwarfs have inner cores made of iron? Neutron rich nuclei like $^{56}$Fe experience a net gravitational force and sediment toward the core. Using new phase diagrams and molecular dynamics simulations, we show that $^{56}$Fe should separate i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::176113e12367bd506ed34662e3013207
http://arxiv.org/abs/2108.11389
http://arxiv.org/abs/2108.11389
Autor:
Charles Horowitz, M. E. Caplan
Publikováno v:
Physical Review Letters. 126
The first solids that form as a cooling white dwarf (WD) starts to crystallize are expected to be greatly enriched in actinides. This is because the melting points of WD matter scale as $Z^{5/3}$ and actinides have the largest charge $Z$. We estimate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fa637bd59d685002ac4b6c240a002218
https://doi.org/10.1103/physrevlett.126.131101
https://doi.org/10.1103/physrevlett.126.131101
Recent observations of Galactic white dwarfs (WDs) with Gaia suggest there is a population of massive crystallizing WDs exhibiting anomalous cooling -- the Q branch. While single-particle $^{22}$Ne sedimentation has long been considered a possible he
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4a63311d438cb272f4073b4b6a435fe2
http://arxiv.org/abs/2010.00036
http://arxiv.org/abs/2010.00036
Despite their astrophysical relevance, nuclear pasta phases are relatively unstudied at high temperatures. We present molecular dynamics simulations of symmetric nuclear matter with several topologies of `lasagna' at a range of temperatures to study
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::087d49a31a09d456dce45301f10edf19
http://arxiv.org/abs/2005.04766
http://arxiv.org/abs/2005.04766
Autor:
M. E. Caplan
Coulomb plasmas crystallize in a number of physical systems, such as dusty plasmas, neutron star crusts, and white dwarf cores. The crystal structure of the one component and binary plasma has received significant attention in the literature, though
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::132c78062896c8463feb94c441f65152
http://arxiv.org/abs/1911.05230
http://arxiv.org/abs/1911.05230
Publikováno v:
Physical Review Letters. 121
The elastic properties of neutron star crusts are relevant for a variety of currently observable or near-future electromagnetic and gravitational wave phenomena. These phenomena may depend on the elastic properties of nuclear pasta found in the inner
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::68ec4d018fb4e8e1fba6093bb8f15c0b
https://doi.org/10.1103/physrevlett.121.132701
https://doi.org/10.1103/physrevlett.121.132701
The crust of accreting neutron stars plays a central role in many different observational phenomena. In these stars, heavy elements produced by H-He burning in the rapid proton capture (rp-) process continually freeze to form new crust. In this paper
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ea88e49178076b0afc61a51fdfbd02fd
http://arxiv.org/abs/1804.06942
http://arxiv.org/abs/1804.06942
Publikováno v:
Physical review letters. 114(3)
Nuclear pasta, with non-spherical shapes, is expected near the base of the crust in neutron stars. Large scale molecular dynamics simulations of pasta show long lived topological defects that could increase electron scattering and reduce both the the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::21feb42dc3717e0571acc43914faf1e2
https://pubmed.ncbi.nlm.nih.gov/25658989
https://pubmed.ncbi.nlm.nih.gov/25658989