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On the Terminal Spins of Accreting Stars and Planets: Boundary Layers
Alexander J. Dittmann
The origin of the spins of giant planets is an open question in astrophysics. As planets and stars accrete from discs, if the specific angular momentum accreted corresponds to that…
The Radius of PSR J0740+6620 from NICER and XMM-Newton Data
M. C. Miller, F. K. Lamb, A. J. Dittmann +25
PSR J07406620 has a gravitational mass of , which is the highest reliably determined mass of any neutron star. As a result, a measurement of its radius wil…
NICER Detection of Thermal X-ray Pulsations from the Massive Millisecond Pulsars PSR J0740+6620 and PSR J1614-2230
M. T. Wolff, S. Guillot, S. Bogdanov +11
We report the detection of X-ray pulsations from the rotation-powered millisecond-period pulsars PSR J0740+6620 and PSR J1614-2230, two of the most massive neutron stars known, usi…
Constraining the Neutron Star Mass--Radius Relation and Dense Matter Equation of State with NICER. III. Model Description and Verification of Parameter Estimation Codes
Slavko Bogdanov, Alexander J. Dittmann, Wynn C. G. Ho +16
We describe the X-ray pulse profile models we use, and how we use them, to analyze Neutron Star Interior Composition Explorer (NICER) observations of rotation-powered millisecond p…
Stellar Evolution in the Disks of Active Galactic Nuclei Produces Rapidly Rotating Massive Stars
Adam S. Jermyn, Alexander J. Dittmann, Matteo Cantiello +1
Stars can either be formed in or captured by the accretion disks in Active Galactic Nuclei (AGN). These AGN stars are irradiated and subject to extreme levels of accretion, which c…
Accretion onto Stars in the Disks of Active Galactic Nuclei
Alexander J. Dittmann, Matteo Cantiello, Adam S. Jermyn
Disks of gas accreting onto supermassive black holes are thought to power active galactic nuclei (AGN). Stars may form in gravitationally unstable regions of these disks, or may be…