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Data Selection Criteria for Spectroscopic Measurements of Neutron Star Radii with X-ray Bursts
Feryal Ozel, Dimitrios Psaltis, Tolga Guver
Data selection and the determination of systematic uncertainties in the spectroscopic measurements of neutron star radii from thermonuclear X-ray bursts have been the subject of nu…
Ground-based transit observations of the HAT-P-18, HAT-P-19, HAT-P-27/WASP-40 and WASP-21 systems
M. Seeliger, M. Kitze, R. Errmann +46
As part of our ongoing effort to investigate transit timing variations (TTVs) of known exoplanets, we monitored transits of the four exoplanets HAT-P-18b, HAT-P-19b, HAT-P-27b/WASP…
The Dense Matter Equation of State from Neutron Star Radius and Mass Measurements
Feryal Ozel, Dimitrios Psaltis, Tolga Guver +3
We present a comprehensive study of spectroscopic radius measurements of twelve neutron stars obtained during thermonuclear bursts or in quiescence. We incorporate, for the first t…
Probing X-ray Absorption and Optical Extinction in the Interstellar Medium Using Chandra Observations of Supernova Remnants
Dillon Foight, Tolga Guver, Feryal Ozel +1
We present a comprehensive study of interstellar X-ray extinction using the extensive Chandra supernova remnant archive and use our results to refine the empirical relation between…
X-ray Perspective of the Twisted Magnetospheres of Magnetars
Shan-Shan Weng, Ersin Gogus, Tolga Guver +1
Anomalous X-ray pulsars (AXPs) and soft gamma-ray repeaters (SGRs) are recognized as the most promising magnetar candidates, as indicated by their energetic bursts and rapid spin-d…
Systematic Uncertainties in the Spectroscopic Measurements of Neutron-Star Masses and Radii from Thermonuclear X-ray Bursts. III. Absolute Flux Calibration
Tolga Guver, Feryal Ozel, Herman Marshall +3
Many techniques for measuring neutron star radii rely on absolute flux measurements in the X-rays. As a result, one of the fundamental uncertainties in these spectroscopic measurem…