Статья

PSR J1810+1744: Companion Darkening and a Precise High Neutron Star Mass

Roger W. RomaniDepartment of Physics, Stanford University, Stanford, CA 94305, USAD. KandelDepartment of Physics, Stanford University, Stanford, CA 94305, USAA. V. FilippenkoMiller Institute for Basic Research in Science, University of California, Berkeley, CA 94720, USAThomas G. BrinkDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USAWeiKang ZhengDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USA

2021en

ABI

Аннотация

Abstract Keck-telescope spectrophotometry of the companion of PSR J1810+1744 shows a flat, but asymmetric light-curve maximum and a deep, narrow minimum. The maximum indicates strong gravity darkening (GD) near the L 1 point, along with a heated pole and surface winds. The minimum indicates a low underlying temperature and substantial limb darkening. The GD is a consequence of extreme pulsar heating and the near-filling of the Roche lobe. Light-curve modeling gives a binary inclination i = 65.°7 ± 0.°4. With the Keck-measured radial-velocity amplitude K c = 462.3 ± 2.2 km s −1 , this gives an accurate neutron star mass M NS = 2.13 ± 0.04 M ⊙ , with important implications for the dense-matter equation of state. A classic direct-heating model, ignoring the L 1 gravitational darkening, would predict an unphysical M NS > 3 M ⊙ . A few other “spider” pulsar binaries have similar large heating and fill factor; thus, they should be checked for such effects.

Перевод пока недоступен

Идентификаторы

DOI: 10.3847/2041-8213/abe2b4

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar