Results 51 to 60 of about 369 (182)

Modeling Binary Lenses and Sources with the BAGLE Python Package

The Astrophysical Journal
Gravitational microlensing is a powerful tool that can be used to find and measure the mass of isolated and dark compact objects. In many microlensing events, the lens, the source, or both may be binary systems.
T. Dex Bhadra, J. R. Lu, Natasha S. Abrams, Andrew Scharf, Edward Broadberry, Casey Lam, Macy J. Huston   +6 more
doaj   +1 more source

Die Suche nach kalten, fremden Welten

Physik in unserer Zeit, Volume 55, Issue 3, Page 140-147, May 2024.
Die meisten der heute bekannten extrasolaren Planeten umkreisen ihren Mutterstern auf engen Umlaufbahnen in weniger als 100 Tagen. Gesteinsplaneten mit größeren Bahnradien sind von herausragender Bedeutung für Theorien der Planetenentstehung. Die Mikrogravitationslinsenmethode bietet eine hervorragende Möglichkeit, solche Planeten zu finden – und das ...
Markus Hundertmark, Yiannis Tsapras
wiley   +1 more source

Analytical Methods in Gravitational Microlensing

International Scholarly Research Notices, Volume 2012, Issue 1, 2012., 2012
We discuss analytical results dealing with photometric and astrometric gravitational microlensing. The first two sections concern approximation methods that allow us to get solutions of the general lens equation near fold caustics and cusp points up to any prescribed accuracy.
V. I. Zhdanov, A. N. Alexandrov, E. V. Fedorova, V. M. Sliusar, J. Gallimore, M. Sazhin   +5 more
wiley   +1 more source

Demagnifying Gravitational Lenses as Probes of Dark Matter Structures and Nonminimal Couplings to Gravity

The Astrophysical Journal Letters
Magnification of total image fluxes is typically considered a defining feature of gravitational microlensing. In contrast, I will show that nonminimal couplings to gravity can generate regions of negative gravitational potential curvature, giving rise to
Hong-Yi Zhang
doaj   +1 more source

Dark Matter Halos from the Inside Out

Advances in Astronomy, Volume 2011, Issue 1, 2011., 2011
The balance of evidence indicates that individual galaxies and groups or clusters of galaxies are embedded in enormous distributions of cold, weakly interacting dark matter. These dark matter “halos” provide the scaffolding for all luminous structures in the universe, and their properties comprise an essential part of the current cosmological model.
James E. Taylor, Rob Ivison
wiley   +1 more source

Systematic KMTNet Planetary Anomaly Search. XII. Complete Sample of 2017 Subprime Field Planets

The Astronomical Journal
We report the analysis of four unambiguous planets and one possible planet from the subprime fields (Γ ≤ 1 hr ^−1 ) of the 2017 Korea Microlensing Telescope Network (KMTNet) microlensing survey, to complete the KMTNet AnomalyFinder planetary sample for ...
Yuqian Gui, Weicheng Zang, Ruocheng Zhai, Yoon-Hyun Ryu, Andrzej Udalski, Hongjing Yang, Cheongho Han, Shude Mao, Leading Authors, Michael D. Albrow, Sun-Ju Chung, Andrew Gould, Kyu-Ha Hwang, Youn Kil Jung, In-Gu Shin, Yossi Shvartzvald, Jennifer C. Yee, Sang-Mok Cha, Dong-Jin Kim, Hyoun-Woo Kim, Seung-Lee Kim, Chung-Uk Lee, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, The KMTNet Collaboration, Przemek Mróz, Michał K. Szymański, Jan Skowron, Radosław Poleski, Igor Soszyński, Paweł Pietrukowicz, Szymon Kozłowski, Krzysztof Ulaczyk, Krzysztof A. Rybicki, Patryk Iwanek, Marcin Wrona, Mariusz Gromadzki, The OGLE Collaboration, Hanyue Wang, Jiyuan Zhang, Renkun Kuang, Qiyue Qian, Wei Zhu, The MAP Collaboration   +45 more
doaj   +1 more source

Astrophysical implications of gravitational microlensing of gravitational waves [PDF]

Astronomy & Astrophysics, 2001
Astrophysical implications of gravitational microlensing of gravitational waves emitted by rotating neutron stars (NSs) are investigated. In particular, attention is focused on the following situations: i) NSs in the galactic bulge lensed by a central black hole of $2.6\times 10^6 M_{\odot}$ or by stars and MACHOs distributed in the galactic bulge ...
DE PAOLIS, Francesco, INGROSSO, Gabriele, NUCITA, Achille   +2 more
openaire   +2 more sources

Dark Matter: A Primer

Advances in Astronomy, Volume 2011, Issue 1, 2011., 2011
Dark matter is one of the greatest unsolved mysteries in cosmology at the present time. About 80% of the Universe′s gravitating matter is nonluminous, and its nature and distribution are for the most part unknown. In this paper, we will outline the history, astrophysical evidence, candidates, and detection methods of dark matter, with the goal to give ...
Katherine Garrett, Gintaras Dūda, David Merritt   +2 more
wiley   +1 more source

Four Planets Found through Microlensing Events Involving Faint Source Stars

The Astronomical Journal
To conduct a comprehensive demographic study of microlensing planets, it is essential to detect all planetary signals that exceed a predefined threshold through a detailed analysis of survey data.
Cheongho Han, Michael D. Albrow, Chung-Uk Lee, Sun-Ju Chung, Andrew Gould, Kyu-Ha Hwang, Youn Kil Jung, Yoon-Hyun Ryu, Yossi Shvartzvald, In-Gu Shin, Jennifer C. Yee, Hongjing Yang, Weicheng Zang, Sang-Mok Cha, Doeon Kim, Dong-Jin Kim, Seung-Lee Kim, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge   +20 more
doaj   +1 more source

New Constraints on Quasar Broad Absorption and Emission Line Regions from Gravitational Microlensing

Frontiers in Astronomy and Space Sciences, 2017
Gravitational microlensing is a powerful tool allowing one to probe the structure of quasars on sub-parsec scale. We report recent results, focusing on the broad absorption and emission line regions.
Damien Hutsemékers, Lorraine Braibant, Dominique Sluse, Timo Anguita, René Goosmann   +4 more
doaj   +1 more source