LA PLACA, Riccardo, Luigi STELLA, Alessandro PAPITTO, Pavel BAKALA, Tiziana DI SALVO, Maurizio FALANGA, Vittorio DE FALCO and Alessandra DE ROSA. Neutron Star Radius-to-mass Ratio from Partial Accretion Disk Occultation as Measured through Fe K alpha Line Profiles. Astrophysical Journal. 2020, vol. 893, No 2, p. "129-1"-"129-12", 12 pp. ISSN 0004-637X. Available from: https://dx.doi.org/10.3847/1538-4357/ab8017. |
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@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 and 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, vol.~893, No~2, p.~''129-1''-''129-12'', 12 pp. ISSN~0004-637X. Available from: https://dx.doi.org/10.3847/1538-4357/ab8017.
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