Neutron Star Radius-to-mass Ratio from Partial Accretion Disk Occultation as Measured through Fe K ...

@article{49408,
   author = {La Placa, Riccardo and Stella, Luigi and Papitto, Alessandro and Bakala, Pavel and Di Salvo, Tiziana and Falanga, Maurizio and De Falco, Vittorio and De Rosa, Alessandra},
   article_number = {2},
   doi = {http://dx.doi.org/10.3847/1538-4357/ab8017},
   keywords = {Neutron stars; Low-mass X-ray binary stars; Stellar accretion disks; General relativity; X-ray sources},
   language = {eng},
   issn = {0004-637X},
   journal = {Astrophysical Journal},
   title = {Neutron Star Radius-to-mass Ratio from Partial Accretion Disk Occultation as Measured through Fe K alpha Line Profiles},
   url = {https://iopscience.iop.org/article/10.3847/1538-4357/ab8017},
   volume = {893},
   year = {2020}
}

TY  - JOUR
ID  - 49408
AU  - La Placa, Riccardo - Stella, Luigi - Papitto, Alessandro - Bakala, Pavel - Di Salvo, Tiziana - Falanga, Maurizio - De Falco, Vittorio - De Rosa, Alessandra
PY  - 2020
TI  - Neutron Star Radius-to-mass Ratio from Partial Accretion Disk Occultation as Measured through Fe K alpha Line Profiles
JF  - Astrophysical Journal
VL  - 893
IS  - 2
SP  - "129-1"-"129-12"
EP  - "129-1"-"129-12"
SN  - 0004637X
KW  - Neutron stars
KW  - Low-mass X-ray binary stars
KW  - Stellar accretion disks
KW  - General relativity
KW  - X-ray sources
UR  - https://iopscience.iop.org/article/10.3847/1538-4357/ab8017
N2  - We present a new method to measure the radius-to-mass ratio (R/M) of weakly magnetic, disk-accreting neutron stars by exploiting the occultation of parts of the inner disk by the star itself. This occultation imprints characteristic features on the X-ray line profile that are unique and are expected to be present in low-mass X-ray binary systems seen under inclinations higher than 65 degrees. We analyze a Nuclear Spectroscopic Telescope Array observation of a good candidate system, 4U 1636-53, and find that X-ray spectra from current instrumentation are unlikely to single out the occultation features owing to insufficient signal-to-noise. Based on an extensive set of simulations we show that large-area X-ray detectors of the future generation could measure R/M to 2 3% precision over a range of inclinations. Such is the precision in radius determination required to derive tight constraints on the equation of state of ultradense matter and it represents the goal that other methods also aim to achieve in the future.
ER  - 

LA PLACA, Riccardo, Luigi STELLA, Alessandro PAPITTO, Pavel BAKALA, Tiziana DI SALVO, Maurizio FALANGA, Vittorio DE FALCO a Alessandra DE ROSA. Neutron Star Radius-to-mass Ratio from Partial Accretion Disk Occultation as Measured through Fe K alpha Line Profiles. \textit{Astrophysical Journal}. 2020, roč.~893, č.~2, s.~''129-1''-''129-12'', 12 s. ISSN~0004-637X. Dostupné z: https://dx.doi.org/10.3847/1538-4357/ab8017.