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Microlensing events towards the Large Magellanic Cloud entail that a sizable fraction of dark matter is in the form of MACHOs (Massive Astrophysical Compact Halo Objects), presumably located in the halo of the Galaxy. Within the present…

Astrophysics · Physics 2020-11-25 F. De Paolis , G. Ingrosso , Ph. Jetzer , M. Roncadelli

Within its observational band the Laser Interferometer Space Antenna, LISA, will simultaneously observe orbital modulated waveforms from Galactic white dwarf binaries, a binary black hole produced gravitational-wave background, and…

General Relativity and Quantum Cosmology · Physics 2021-10-08 Guillaume Boileau , Astrid Lamberts , Nelson Christensen , Neil J. Cornish , Renate Meyer

The space based gravitational wave detector LISA is expected to observe a large population of Galactic white dwarf binaries whose collective signal is likely to dominate instrumental noise at observational frequencies in the range 10^{-4}…

General Relativity and Quantum Cosmology · Physics 2009-11-11 Soumya D. Mohanty , Rajesh K. Nayak

Using the proposed space gravitational wave detector LISA, we will be able to measure the geometrical configurations of $\sim 10^4$ close white dwarf binaries in our Galaxy. The obtained data will be an entirely new resource to examine the…

High Energy Astrophysical Phenomena · Physics 2024-10-31 Naoki Seto

The upcoming Laser Interferometer Space Antenna (LISA) will detect a large gravitational-wave foreground of Galactic white dwarf binaries. These sources are exceptional for their probable detection at electromagnetic wavelengths, some long…

MACHOs (Massive Astrophysical Compact Halo Objects) - as discovered by microlensing experiments towards the LMC - provide a natural explanation for the galactic halo dark matter. A realistic possibility is that MACHOs are brown dwarfs of…

Astrophysics · Physics 2007-05-23 F. De Paolis , G. Ingrosso , Ph. Jetzer , M. Roncadelli

Upcoming space-based gravitational-wave detectors will be sensitive to millions and resolve tens of thousands of stellar-mass binary systems at mHz frequencies. The vast majority of these will be double white dwarfs in our Galaxy. The…

High Energy Astrophysical Phenomena · Physics 2025-08-21 Riccardo Buscicchio , Antoine Klein , Valeriya Korol , Francesco Di Renzo , Christopher J. Moore , Davide Gerosa , Alessandro Carzaniga

We compute the expected gravitational wave signal from coalescing massive black hole (MBH) binaries at the center of galaxies in a hierarchical structure formation scenario in which seed holes of intermediate mass form far up in the dark…

Astrophysics · Physics 2009-11-10 Alberto Sesana , Francesco Haardt , Piero Madau , Marta Volonteri

Over the next decade, third-generation interferometers and the space-based LISA mission will observe binaries in galactic centers involving supermassive black holes with millions of solar masses. More precise measurements of more extreme…

General Relativity and Quantum Cosmology · Physics 2023-08-09 Francisco Duque

The discovery of Massive Astrophysical Compact Halo Objects (MACHOs) in microlensing experiments makes it compelling to understand their physical nature, as well as their formation mechanism. Within the present uncertainties, brown dwarfs…

Astrophysics · Physics 2011-05-12 F. De Paolis , G. Ingrosso , Ph. Jetzer , M. Roncadelli

We compute the expected low-frequency gravitational wave signal from coalescing massive black hole (MBH) binaries at the center of galaxies. We follow the merging history of halos and associated holes via cosmological Monte Carlo…

Astrophysics · Physics 2009-11-10 A. Sesana , F. Haardt , P. Madau , M. Volonteri

We present data analysis methods used in detection and the estimation of parameters of gravitational wave signals from the white dwarf binaries in the mock LISA data challenge. Our main focus is on the analysis of challenge 3.1, where the…

General Relativity and Quantum Cosmology · Physics 2010-04-23 Arkadiusz Błaut , Stanislav Babak , Andrzej Królak

I propose a method to detect planets around compact binaries that are strong sources of gravitational radiation. This approach is to measure gravitational-wave phase modulations induced by the planets, and its prospect is studied with a…

Astrophysics · Physics 2013-09-05 Naoki Seto

The phase of in-spiral of double compact objects (DCOs: NS+WD, NS+NS, BH+NS, and BH+BH binaries) in the disk field population of the Galaxy provides a potential source in the frequency range from $10^{-4}$ to 0.1 Hz, which can be detected…

Solar and Stellar Astrophysics · Physics 2014-04-17 Jinzhong Liu , Yu Zhang

Aims: We study single and binary white dwarfs in the inner halo of the Milky Way in order to learn more about the conditions under which the population of halo stars was born, such as the initial mass function (IMF), the star formation…

Close pairs of white dwarfs are potential progenitors of Type~Ia supernovae and they are common, with of order 100 -- 300 million in the Galaxy. As such they will be significant, probably dominant, sources of the gravitational waves…

Solar and Stellar Astrophysics · Physics 2015-05-27 T. R. Marsh

For the stochastic gravitational wave backgrounds (SGWBs) search centred at the milli-Hz band, the galactic foreground produced by white dwarf binaries (WDBs) within the Milky Way contaminates the extra-galactic signal severely. Because of…

General Relativity and Quantum Cosmology · Physics 2023-08-22 Shijie Lin , Bin Hu , Xue-Hao Zhang , Yu-Xiao Liu

The detection of gravitational waves from the merger of binary black holes by the LIGO Collaboration has opened a new window to astrophysics. With the sensitivities of ground based detectors in the coming years we can only detect the local…

High Energy Astrophysical Phenomena · Physics 2017-06-28 Ilias Cholis

In multi-component dark matter models, a fraction $f_\text{pbh}$ of the dark matter could be in the form of primordial black holes (PBHs) with (sub)solar masses. Some would have formed binaries that presently trace the Milky Way halo of…

Cosmology and Nongalactic Astrophysics · Physics 2025-06-06 Frans van Die , Ivan Rapoport , Yonadav Barry Ginat , Vincent Desjacques

The planned space-based gravitational wave detector, LISA, will provide a fundamentally new means of studying the orbital alignment of close white dwarf binaries. However, due to the inherent symmetry of their gravitational wave signals, a…

General Relativity and Quantum Cosmology · Physics 2025-08-13 Naoki Seto