Results 31 to 40 of about 3,356 (111)

OGLE-2014-BLG-1112LB: A Microlensing Brown Dwarf Detected through the Channel of a Gravitational Binary-lens Event [PDF]

The Astrophysical Journal, 2017
Abstract Due to the nature of the gravitational field, microlensing, in principle, provides an important tool for detecting faint and even dark brown dwarfs. However, the number of identified brown dwarfs is limited due to the difficulty of the lens mass measurement that is needed to check the substellar nature of the lensing object.
C. Han, A. Udalski, V. Bozza, M. K. Szymański, I. Soszyński, J. Skowron, P. Mróz, R. Poleski, P. Pietrukowicz, S. Kozłowski, K. Ulaczyk, Ł. Wyrzykowski, S. Calchi Novati, G. D’Ago, M. Dominik, M. Hundertmark, U. G. Jorgensen, G. Scarpetta   +17 more
openaire   +5 more sources

Astrometric Method to Break the Photometric Degeneracy between Binary-source and Planetary Microlensing Perturbations [PDF]

, 2001
An extra-solar planet can be detected by microlensing because the planet can perturb the smooth lensing light curve created by the primary lens. However, it was shown by Gaudi that a subset of binary-source events can produce light curves that closely ...
Cheongho Han, Dominik M., Hog E., Lasserre T. M., Sazhin M. V.   +4 more
core   +3 more sources

Automated Detection of Short Optical Transients of Astrophysical Origin in Real Time

Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010
The detection of short optical transients of astrophysical origin in real time is an important task for existing robotic telescopes. The faster a new optical transient is detected, the earlier follow‐up observations can be started. The sooner the object is identified, the more data can be collected before the source fades away, particularly in the most
Marcin Sokołowski, Katarzyna Małek, Lech W. Piotrowski, Grzegorz Wrochna, Taro Kotani   +4 more
wiley   +1 more source

Detectability of extrasolar moons as gravitational microlenses [PDF]

, 2010
We evaluate gravitational lensing as a technique for the detection of extrasolar moons. Since 2004 gravitational microlensing has been successfully applied as a detection method for extrasolar planets.
Liebig, Christine, Wambsganss, Joachim
core   +1 more source

Three Binary-source Binary-lens Microlensing Events from the 2024 Microlensing Campaign

Publications of the Astronomical Society of the Pacific
Abstract We investigated microlensing events detected by the Optical Gravitational Lensing Experiment (OGLE) and Korea Microlensing Telescope Network surveys during the 2024 observing season, focusing on those that exhibit very complex anomaly features.
Cheongho Han, Chung-Uk Lee, Andrzej Udalski, Michael D. Albrow, Sun-Ju Chung, Andrew Gould, Youn Kil Jung, Kyu- Ha Hwang, Yoon-Hyun Ryu, Yossi Shvartzvald, In-Gu Shin, Jennifer C. Yee, Weicheng Zang, Hongjing Yang, Doeon Kim, Dong-Jin Kim, Byeong-Gon Park, Przemek Mróz, Michał K. Szymański, Jan Skowron, Radosław Poleski, Igor Soszyński, Paweł Pietrukowicz, Szymon Kozłowski, Krzysztof A. Rybicki, Patryk Iwanek, Krzysztof Ulaczyk, Marcin Wrona, Mariusz Gromadzki, Mateusz J. Mróz   +29 more
openaire   +2 more sources

OGLE-2013-BLG-0578L: Microlensing Binary Composed of A Brown Dwarf And An M Dwarf

, 2015
Determining physical parameters of binary microlenses is hampered by the lack of information about the angular Einstein radius due to the difficulty of resolving caustic crossings.
A. Udalski, C. Han, G. Pietrzyński, H. Park, I. Soszyński, J. Skowron, K. Ulaczyk, M. K. Szymański, null null, P. Pietrukowicz, R. Poleski, S. Kozłowski, Ł. Wyrzykowski   +12 more
core   +1 more source

OGLE-2014-BLG-0289: Precise Characterization of a Quintuple-peak Gravitational Microlensing Event [PDF]

, 2018
We present the analysis of the binary-microlensing event OGLE-2014-BLG-0289. The event light curve exhibits five very unusual peaks, four of which were produced by caustic crossings and the other by a cusp approach.
A. Bhattacharya, A. Fukui, A. Gould, A. Sharan, A. Udalski, A. Yonehara, Alard C., Albrow M. D., An J. H., Aubourg E., Bessell M. S., C. Beichman, C. H. Ling, C. Han, C. Ranc, C. Snodgrass, Calchi Novati S., Choi J.-Y., Claret A., D. J. Sullivan, D. M. Bramich, D. P. Bennett, D. Suzuki, E. Bachelet, F. Abe, G. DÁgo, Gould A., Gould A., H. Munakata, Han C., Han C., I. A. Bond, I. A. Steele, I. Soszyński, I.-G. Shin, J. C. Yee, J. Menzies, J. Skowron, J. Wambsganss, K. Horne, K. Kawasaki, K. Masuda, K. Ohnishi, K. Ulaczyk, M. C. A. Li, M. Dominik, M. Donachie, M. Hundertmark, M. K. Szymański, M. Nagakane, Mróz P., N. Kains, N. Koshimoto, N. Rattenbury, Nataf D. M., P. Evans, P. J. Tristram, P. Mróz, P. Pietrukowicz, Poindexter S., R. Barry, R. Figuera Jaimes, R. Poleski, R. Schmidt, R. W. Pogge, S. Calchi Novati, S. Carey, S. Kozłowski, S. Miyazaki, Schechter P. L., Shin I.-G., Skowron J., Street R. A., Sumi T., T. Saito, T. Sumi, T. Yamada, Udalski A., Udalski A., Udalski A., V. Bozza, W. Zhu, W.-T. Kim, Woźniak P. R., Wyrzykowski L., Y. Hirao, Y. Itow, Y. K. Jung, Y. Matsubara, Y. Muraki, Yee J. C., Yoo J., Zhu W., Ł. Wyrzykowski   +93 more
core   +5 more sources

Improved Detection Rates for Close Binaries Via Astrometric Observations of Gravitational Microlensing Events [PDF]

, 1999
In addition to constructing a Galactic matter mass function free from the bias induced by the hydrogen-burning limit, gravitational microlensing allows one to construct a mass function which is less affected by the problem of unresolved binaries (Gaudi &
Alard C., Ansari R., Ansari R., Cheongho Han, Dominik M., Duquennoy A., Kroupa P., Kyongae Chang, Paczynski B., Schneider P., Udalski A., Witt H., Zhao H.   +12 more
core   +3 more sources

Lens Masses and Distances from Microlens Parallax and Flux

, 2015
I present a novel method for measuring lens masses for microlensing events. By combining a measured lens flux with the microlens parallax vector pi_E, it is possible to derive the mass of the lens system without knowing the angular size of the Einstein ...
Yee, Jennifer C.
core   +1 more source

Interpretation of Strong Short-Term Central Perturbations in the Light Curves of Moderate-Magnification Microlensing Events [PDF]

, 2009
To improve the planet detection efficiency, current planetary microlensing experiments are focused on high-magnification events searching for planetary signals near the peak of lensing light curves.
A. Allan, A. Cassan, A. Fukui, A. Gould, A. Korpela, A. Udalski, A. Williams, Albrow, and M. Zub, B. S. Gaudi, B.-G. Park, C. H. Ling, C. Han, C. S. Botzler, C. Snodgrass, C.-U. Lee, Chung, D. D. Prester, D. Kim, D. Kubas, D. L. DePoy, D. M. Bramich, D. P. Bennett, D. S. Sullivan, Dominik, Dong, Dong, E. Corrales, F. Abe, G. Pietrzyński, G. W. Christie, Ghosh, Gould, Gould, Gould, H. Calitz, Han, Han, Han, I. A. Bond, I. Soszyński, I. Steele, J. A. R. Caldwell, J. B. Hearnshaw, J. B. Marquette, J. Donatowicz, J. Greenhill, J. McCormick, J. Menzies, J. P. Beaulieu, J. Wambsganss, K. C. Sahu, K. Furusawa, K. Hill, K. Horne, K. Kamiya, K. Masuda, K. Ohnishi, K. R. Pollard, K. Ulaczyk, K.-H. Hwang, L. A. B. Monard, L. Skuljan, M. Bode, M. Burgdorf, M. D. Albrow, M. Dominik, M. Hoffman, M. K. Szymański, M. Kubiak, M. Nagaya, N. Kains, N. Miyake, N. Rattenbury, O. Szewczyk, P. C. M. Yock, P. Fouque, P. J. Tristram, P. M. Kilmartin, P. Meintjes, Park, Pejcha, R. Martin, R. Street, R. W. Pogge, S. Brillant, S. Dieters, S. Dong, T. Natusch, T. Sako, T. Sumi, T. Tokumura, To. Saito, U. G. Jørgensen, Udalski, V. Batista, W. Allen, W. L. Sweatman, W. Lin, Y. C. Perrott, Y. Itow, Y. Matsubara, Y. Muraki, Y. Tsapras, Yoo, Ł. Wyrzykowski   +105 more
core   +3 more sources