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dc.contributor.advisorNevin N. Weinberg and Matthew J. Evans.en_US
dc.contributor.authorYu, Hang,Ph. D.Massachusetts Institute of Technology.en_US
dc.contributor.otherMassachusetts Institute of Technology. Department of Physics.en_US
dc.date.accessioned2020-01-08T19:30:47Z
dc.date.available2020-01-08T19:30:47Z
dc.date.copyright2019en_US
dc.date.issued2019en_US
dc.identifier.urihttps://hdl.handle.net/1721.1/123343
dc.descriptionThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.en_US
dc.descriptionThesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2019en_US
dc.descriptionCataloged from student-submitted PDF version of thesis.en_US
dc.descriptionIncludes bibliographical references (pages 269-281).en_US
dc.description.abstractNeutron stars (NSs) are astrophysical laboratories that allow us to probe physics at extreme conditions. The first half of this Thesis is devoted to exploring how we can connect theoretical models of NSs to observational signatures whose detections are made possible by state-of-the-art instruments. We start by exploring the dynamics of super-Eddington winds launched in type-I X-ray bursts at the surface of a NS. We show that freshly synthesized heavy elements can be exposed by the wind and will dominate the composition at the photosphere after ~ 1 s. This may create detectable absorption edges in burst spectra and explain the observed transitions from super-expansions to moderate expansions. Gravitational-wave (GW) observatories such as Advanced LIGO (aLIGO) open up a new possibility to probe deep inside the NS by examining the tidal signatures in the GW waveforms.en_US
dc.description.abstractIn this Thesis, we study the tidal excitations of g-modes in a cold, superfluid NS during the inspiral driven by gravitational radiation and their resulting phase shifts in the GW waveform. We consider both the g-modes supported by the muon-to-electron gradient in the outer core and the g-modes supported by the hyperon-to-proton gradient in the inner core. We further show that the former might be detectable by event stacking with the third generation of GW detectors. The second half of this Thesis is devoted to the experimental upgrades to a LIGO interferometers. The focus will be on the angular sensing and control system. We will cover design considerations on the system based on both stability and noise requirements. This is followed by a thorough discussion of the radiation-pressure torques, including both the Sidles-Sigg and the d[Rho]/d[theta] effects.en_US
dc.description.abstractMore importantly, we show that such optical torques can be compensated for with newly developed techniques, which is a critical step for aLIGO to reach high-power operations. Lastly, we discuss the prospects of detecting GW at 5 Hz with ground-based detectors and demonstrate that low-frequency sensitivity is crucial for both increasing the detection range for black-hole binaries and enabling timely localization of binary NS systems.en_US
dc.description.statementofresponsibilityby Hang Yu.en_US
dc.format.extent281 pagesen_US
dc.language.isoengen_US
dc.publisherMassachusetts Institute of Technologyen_US
dc.rightsMIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission.en_US
dc.rights.urihttp://dspace.mit.edu/handle/1721.1/7582en_US
dc.subjectPhysics.en_US
dc.titleAstrophysical signatures of neutron stars in compact binaries and experimental improvements on gravitational-wave detectorsen_US
dc.title.alternativeAstrophysical signatures of NSs in compact binaries and experimental improvements on gravitational-wave detectorsen_US
dc.typeThesisen_US
dc.description.degreePh. D.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Physicsen_US
dc.identifier.oclc1132722343en_US
dc.description.collectionPh.D. Massachusetts Institute of Technology, Department of Physicsen_US
dspace.imported2020-01-08T19:30:45Zen_US
mit.thesis.degreeDoctoralen_US
mit.thesis.departmentPhysen_US


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