Results 51 to 60 of about 3,317 (119)

Evolutionary algorithm-based analysis of gravitational microlensing lightcurves

, 2012
A new algorithm developed to perform autonomous fitting of gravitational microlensing lightcurves is presented. The new algorithm is conceptually simple, versatile and robust, and parallelises trivially; it combines features of extant evolutionary ...
Asada, Beaulieu, Bennett, Bennett, Bennett, Bourassa, Bozza, Burnham, Cassan, Charbonneau, Charbonneau, Di Stefano, Dominik, Dominik, Eiben, Gaudi, Gaudi, Gaudi, Gould, Gregory, Haario, Haupt, Heavens, Holland, Hundertmark, Jaroszyński, Kains, King, Kramer, Lagarias, Mao, Mao, Michalewicz, Michalewicz, Miller, Moré, Nelder, Night, Pospichal, Press, Quanz, Rajpaul, Ralston, Risco-Martín, Shin, Shvartzvald, Skowron, Sumi, Sumi, Thierens, Udalski, V. Rajpaul, Vermaak, Vermaak, Wambsganss, Wehrens, Witt   +56 more
core   +1 more source

Search for exoplanets in M31 with pixel-lensing and the PA-99-N2 event revisited [PDF]

, 2010
Several exoplanets have been detected towards the Galactic bulge with the microlensing technique. We show that exoplanets in M31 may also be detected with the pixel-lensing method, if telescopes making high cadence observations of an ongoing microlensing
A. Gould, A. Gould, A. Riffesser, A.F. Zakharov, A.P.S. Crotts, Achille Nucita, Alexander Zakharov, D. Kim, E. Kerins, E. Kerins, E.A. Baltz, Francesco De Paolis, G. Covone, G. Ingrosso, G. Ingrosso, G. Ingrosso, Gabriele Ingrosso, H.J. Witt, H.J. Witt, J.H. An, K. Griest, P. Baillon, Philippe Jetzer, R. Ansari, S. Calchi Novati, S. Dong, S. Ida, S. Mao, S. Paulin-Henriksson, S. Tabachnik, S.-J. Chung, Sebastiano Calchi Novati, V. Bozza   +32 more
core   +1 more source

The complete catalogue of light curves in equal-mass binary microlensing [PDF]

, 2015
The light curves observed in microlensing events due to binary lenses span an extremely wide variety of forms, characterised by U-shaped caustic crossings and/or additional smoother peaks.
Bozza, Valerio, D'Ago, Giuseppe, Dominik, Martin, Liebig, Christine   +3 more
core   +2 more sources

MACHO 96-LMC-2: Lensing of a Binary Source in the LMC and Constraints on the Lensing Object

, 2000
We present photometry and analysis of the microlensing alert MACHO 96-LMC-2. The ~3% photometry provided by the Global Microlensing Alert Network follow--up effort reveals a periodic modulation in the lightcurve.
A. B. Tomaney, A. C. Becker, A. J. Drake, Afonso C., B. A. Peterson, Becker A., C. A. Nelson, C. Alcock, C. W. Stubbs, D. Minniti, D. P. Bennett, D. R. Alves, D. Welch, Derue F., Dominik M., K. C. Freeman, K. Griest, K. H. Cook, M. Geha, M. J. Lehner, M. R. Pratt, P. J. Quinn, P. Popowski, R. A. Allsman, S. L. Marshall, Schwering P. B. W., T. S. Axelrod, T. Vandehei, W. Sutherland   +28 more
core   +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

Starspot induced effects in microlensing events with rotating source star

, 2015
We consider the effects induced by the presence of hot and cold spots on the source star in the light curves of simulated microlensing events due to either single or binary lenses taking into account the rotation of the source star and the orbital motion
De Paolis, Francesco, Giordano, Mosè, Ingrosso, Gabriele, Nucita, Achille A.   +3 more
core   +1 more source

The MACHO Project LMC Microlensing Results from the First Two Years and the Nature of the Galactic Dark Halo [PDF]

, 1996
The MACHO Project is a search for dark matter in the form of massive compact halo objects (Machos). Photometric monitoring of millions of stars in the Large Magellanic Cloud (LMC), Small Magellanic Cloud (SMC), and Galactic bulge is used to search for ...
A. C. Becker, A. W. Rodgers, Alard C., Alard C., Ansari R., Aubourg E., B. A. Peterson, C. Alcock, C. W. Stubbs, Carswell R. F., D. Alves, D. L. Welch, D. P. Bennett, De Rujula A., Della Valle M., Evans N. W., Evans N. W., J. Guern, K. C. Freeman, K. Griest, K. H. Cook, M. J. Lehner, M. R. Pratt, P. J. Quinn, R. A. Allsman, Refsdal S., Refsdal S., S. L. Marshall, Scalo J. M., Szymanski M., T. S. Axelrod, Udalski A., W. Sutherland   +32 more
core   +2 more sources

An ice giant exoplanet interpretation of the anomaly in microlensing event OGLE-2011-BLG-0173

, 2018
We analyze the microlensing event OGLE-2011-BLG-0173, which shows a small perturbation at the end of the microlensing event caused by the primary lens. We consider both binary lens and binary source models and we explore their degeneracies, some of which
Gaudi, B. S., Kozlowski, S., Pietrukowicz, P., Poleski, R., Skowron, J., Soszynski, I., Szymanski, M. K., Udalski, A., Ulaczyk, K., Wyrzykowski, L.   +9 more
core   +1 more source

Investigating Binary Properties with Next-Generation Microlensing Surveys [PDF]

, 2007
We explore the usefulness of future gravitational microlensing surveys in the study of binary properties such as the binary fraction and the distributions of binary separation and mass ratio by using the binary sample detectable through a channel of ...
Cheongho Han, Dominik M., Duquennoy A., Jaroszynski M., Pringle J. E., Udalski A.   +5 more
core   +2 more sources

OGLE-2009-BLG-023/MOA-2009-BLG-028: Characterization of a Binary Microlensing Event Based on Survey Data

, 2011
We report the result of the analysis of the light curve of a caustic-crossing binary-lens microlensing event OGLE-2009-BLG-023/MOA-2009-BLG-028. Even though the event was observed solely by survey experiments, we could uniquely determine the mass of the ...
A. Fukui, A. Gould, A. Korpela, A. Udalski, Alcock, Alcock, An, Bennett, Bennett, Bessel, Bond, C. H. Ling, C. Han, C. S. Botzler, D. J. Sullivan, D. P. Bennett, Dominik, Dominik, Dong, Dong, F. Abe, G. Pietrzyński, Gaudi, Gaudi, Gould, Gould, Gould, Gould, Gould, Griest, Han, Hwang, Hwang, I. A. Bond, I. Soszyński, J. B. Hearnshaw, Jaroszyński, Jaroszyński, Jaroszyński, Jaroszyński, K. Furusawa, K. Kamiya, K. Masuda, K. Ohnishi, K. Ulaczyk, K.-H. Hwang, Kayser, Kervella, Kubas, M. Freeman, M. Jaroszyński, M. K. Szymański, M. Kubiak, Mao, N. J. Rattenbury, N. Miyake, Nemiroff, O. Szewczyk, P. C. M. Yock, P. J. Tristram, P. M. Kilmartin, Paczyński, Pejcha, Refsdal, Ryu, Schneider, Skowron, Smith, Stanek, Stanek, T. Sako, T. Sumi, To. Saito, Udalski, Udalski, W. L. Sweatman, W. Lin, Wambsganss, Witt, Y. C. Perrott, Y. Itow, Y. Matsubara, Y. Muraki, Yoo, Ĺ. Wyrzykowski   +84 more
core   +1 more source