Results 41 to 50 of about 351 (182)

OGLE-2019-BLG-1180Lb: Discovery of a Wide-orbit Jupiter-mass Planet around a Late-type Star

The Astronomical Journal, 2023
We report on the discovery and analysis of the planetary microlensing event OGLE-2019-BLG-1180 with a planet-to-star mass ratio q ∼ 0.003. The event OGLE-2019-BLG-1180 has unambiguous cusp-passing and caustic-crossing anomalies, which were caused by a ...
Sun-Ju Chung, Andrzej Udalski, Jennifer C. Yee, Andrew Gould, Leading Authors, Michael D. Albrow, Youn Kil Jung, Kyu-Ha Hwang, Cheongho Han, Yoon-Hyun Ryu, In-Gu Shin, Yossi Shvartzvald, Hongjing Yang, Weicheng Zang, Sang-Mok Cha, Dong-Jin Kim, Seung-Lee Kim, Chung-Uk Lee, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, The KMTNet collaboration, Radek Poleski, Przemek Mróz, Jan Skowron, Michał K. Szymański, Igor Soszyński, Paweł Pietrukowicz, Szymon Kozłowski, Krzysztof Ulaczyk, Krzysztof A. Rybicki, Patryk Iwanek, Marcin Wrona, Mariusz Gromadzki, The OGLE collaboration   +35 more
doaj   +1 more source

Gravitational microlensing of fractal sources [PDF]

Monthly Notices of the Royal Astronomical Society, 2004
Gravitational microlensing has proven to be a powerful tool in the study of quasars, providing some of the strongest limits on the scales of structure in the central engine. Typically sources are considered to be smoothly varying on some particular scale; such simple sources result in recognisable time scales in microlensing light curves from which the
openaire   +2 more sources

Real-Time Detection Of Gravitational Microlensing [PDF]

Symposium - International Astronomical Union, 1996
Real-time detection of microlensing has moved from proof of concept in 1994 (Udalski et al. 1994a, Alcock et al. 1994) to a steady stream of events this year. Global dissemination of these events by the MACHO and OGLE collaborations has made possible intensive photometric and spectroscopic follow up from widely dispersed sites confirming the ...
Pratt, M. R., Alcock, C., Allsman, R. A., Alves, D., Axelrod, T. S., Becker, A., Bennett, D. P., Cook, K. H., Freeman, K. C., Griest, K., Guern, J., Lehner, M., Marshall, S. L., Peterson, B. A., Quinn, P. J., Reiss, D., Rodgers, A. W., Stubbs, C., Sutherland, W., Welch, D.   +19 more
openaire   +2 more sources

Searching for the QCD Axion with Gravitational Microlensing [PDF]

Physical Review Letters, 2017
The phase transition responsible for axion dark matter production can create large amplitude isocurvature perturbations which collapse into dense objects known as axion miniclusters. We use microlensing data from the EROS survey, and from recent observations with the Subaru Hyper Suprime Cam to place constraints on the minicluster scenario.
Fairbairn, Malcolm, Marsh, David J.E., Quevillon, Jérémie   +2 more
openaire   +4 more sources

Gravitational Lensing of Charged Ayon‐Beato‐Garcia Black Holes and Nonlinear Effects of Maxwell Fields

Advances in High Energy Physics, Volume 2018, Issue 1, 2018., 2018
Nonsingular Ayon‐Beato‐Garcia (ABG) spherically symmetric static black hole (BH) with charge to mass ratio q = g/2m is metric solution of Born Infeld nonlinear Maxwell‐Einstein theory. Central region of the BH behaves as (anti‐)de Sitter for (|q | > 1) | q | < 1.
H. Ghaffarnejad, M. Amirmojahedi, H. Niad, Andrea Coccaro   +3 more
wiley   +1 more source

Bose‐Einstein Condensate Dark Matter Halos Confronted with Galactic Rotation Curves

Advances in High Energy Physics, Volume 2017, Issue 1, 2017., 2017
We present a comparative confrontation of both the Bose‐Einstein Condensate (BEC) and the Navarro‐Frenk‐White (NFW) dark halo models with galactic rotation curves. We employ 6 High Surface Brightness (HSB), 6 Low Surface Brightness (LSB), and 7 dwarf galaxies with rotation curves falling into two classes.
M. Dwornik, Z. Keresztes, E. Kun, L. Á. Gergely, Sergei D. Odintsov   +4 more
wiley   +1 more source

Gravitational microlensing results from macho [PDF]

Nuclear Physics B - Proceedings Supplements, 1995
Talk given at Neutrino-94, to appear in Nucl. Phys. B Proceedings Supp.
Sutherland, W., Alcock, C., Allsman, R., Axelrod, T., Bennett, D., Chan, S., Cook, K., Freeman, K., Griest, K., Marshall, S., Perlmutter, S., Peterson, B., Pratt, M., Quinn, P., Rodgers, A., Stubbs, C.   +15 more
openaire   +2 more sources

Estimating Finite Source Effects in Microlensing Events due to Free‐Floating Planets with the Euclid Survey

Advances in Astronomy, Volume 2015, Issue 1, 2015., 2015
In recent years free‐floating planets (FFPs) have drawn a great interest among astrophysicists. Gravitational microlensing is a unique and exclusive method for their investigation which may allow obtaining precious information about their mass and spatial distribution.
Lindita Hamolli, Mimoza Hafizi, Francesco De Paolis, Achille A. Nucita, Zdzislaw E. Musielak   +4 more
wiley   +1 more source

Astrophysical applications of gravitational microlensing [PDF]

Research in Astronomy and Astrophysics, 2012
26 pages, 8 figures, review article for the special IAU issue of RAA, comments ...
openaire   +3 more sources

Possibility of Detection of Exomoons with Inclined Orbits Orbiting Pulsar Planets Using the Time‐of‐Arrival Analysis

Advances in Astronomy, Volume 2014, Issue 1, 2014., 2014
The perturbation caused by planet‐moon binarity on the time‐of‐arrival (TOA) signal of a pulsar with an orbiting planet is derived for the case of the orbit of the planet‐moon system inclined of an angle α with respect to the plane of the orbit of the planet‐moon barycenter around the pulsar.
Antonio Pasqua, Khudhair A. Assaf, Gary Wegner   +2 more
wiley   +1 more source