Results 81 to 90 of about 15,221 (204)

Gravitational Microlensing [PDF]

Proceedings of the International Astronomical Union, 2011
AbstractGravitational microlensing is a well established and unique field of time-domain astrophysics. For two decades microlensing surveys have been regularly observing millions of stars to detect elusive events that follow a characteristic Paczyński lightcurve.
Wyrzykowski, Ł., Moniez, M., Horne, K., Street, R.   +3 more
openaire   +2 more sources

Microlensing Signatures of Dyson Sphere–like Structures around Primordial Black Holes as Technosignatures of Extraterrestrial Advanced Civilizations

The Astrophysical Journal
We investigate the microlensing detectability of extraterrestrial technosignatures originating from Dyson sphere-like structures, such as Dyson swarms surrounding primordial black holes.
Shant Baghram
doaj   +1 more source

OGLE-2017-BLG-0448Lb: A Low Mass–Ratio Wide-orbit Microlensing Planet?

The Astronomical Journal
The gravitational microlensing technique is most sensitive to planets in a Jupiter-like orbit and has detected more than 200 planets. However, only a few wide-orbit ( s > 2) microlensing planets have been discovered, where s is the planet-to-host ...
Ruocheng Zhai, Radosław Poleski, Weicheng Zang, Youn Kil Jung, Andrzej Udalski, Renkun Kuang, Leading Authors, Michael D. Albrow, Sun-Ju Chung, Andrew Gould, Cheongho Han, Kyu-Ha Hwang, Yoon-Hyun Ryu, In-Gu Shin, Yossi Shvartzvald, Hongjing Yang, 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, Jan Skowron, Michał K. Szymański, Igor Soszyński, Krzysztof Ulaczyk, Paweł Pietrukowicz, Szymon Kozłowski, Przemek Mróz, Krzysztof A. Rybicki, Patryk Iwanek, Marcin Wrona, Mariusz Gromadzki, The OGLE Collaboration, Hanyue Wang, Shude Mao, Jiyuan Zhang, Qiyue Qian, Wei Zhu, The MAP Collaboration   +44 more
doaj   +1 more source

How Rare Are TESS Free-floating Planets?

The Astrophysical Journal Letters
Recently, Kunimoto et al. claimed that a short-lived signal in the Transiting Exoplanet Survey Satellite (TESS) Sector 61 database was possibly caused by a microlensing event with a terrestrial-mass free-floating planet (FFP) lens.
Hongjing Yang, Weicheng Zang, Tianjun Gan, Renkun Kuang, Andrew Gould, Shude Mao   +5 more
doaj   +1 more source

The Variable Sky Through the OGLE Eye

Universe
The Optical Gravitational Lensing Experiment (OGLE) is one of the most productive and influential photometric sky surveys in the history of observational astronomy. Originally designed to detect dark matter through gravitational microlensing events, OGLE
Patryk Iwanek
doaj   +1 more source

Single-epoch and Differential Astrometric Microlensing of Quasars

The Astrophysical Journal
We propose and discuss a new experimental approach to measure the centroid shift induced by gravitational microlensing in the images of lensed quasars (astrometric microlensing).
R. Forés-Toribio, E. Mediavilla, J. A. Muñoz, J. Jiménez-Vicente, C. Fian, C. del Burgo   +5 more
doaj   +1 more source

A Differentiable Binary Microlensing Model Using Adaptive Contour Integration Method

The Astronomical Journal
We present microlux , which is a Jax -based code that can compute the binary microlensing light curve and its derivatives both efficiently and accurately.
Haibin Ren, Wei Zhu
doaj   +1 more source

The MACHO Project HST Follow-Up: The Large Magellanic Cloud Microlensing Source Stars

, 2009
We present Hubble Space Telescope (HST) WFPC2 photometry of 13 microlensed source stars from the 5.7 year Large Magellanic Cloud (LMC) survey conducted by the MACHO Project.
Alcock, C., Axelrod, T. S., Becker, A. C., Bennett, D. P., Cook, K. H., Dalal, N., Drake, A. J., Freeman, K. C., Geha, M., Griest, K., Keller, S. C., Lehner, M. J., Marshall, S. L., Minniti, D., Nelson, C. A., Nikolaev, S., Popowski, P., Pratt, M. R., Quinn, P. J., Stubbs, C. W., Sutherland, W., Tomaney, A. B., Vandehei, T., Welch, D.   +23 more
core  

Parallax Effect in Microlensing Events Due to Free-floating Planets

The Astronomical Journal
One of the most important applications of microlensing observations is the detection of free-floating planets (FFPs). The timescale of microlensing due to FFPs ( t _E ) is short (a few days). Discerning the annual parallax effect in observations of these
Parisa Sangtarash, Sedighe Sajadian
doaj   +1 more source

Gamma-Ray Variability Induced by Microlensing on Intermediate Size Structures in Lensed Blazars

Galaxies, 2016
Changes of the magnification ratio of images in a lensed blazar, caused by microlensing on individual stars, have been proposed as a probe of the size and velocity of the emission region in the lensed source.
Julian Sitarek, Włodek Bednarek
doaj   +1 more source