Results 11 to 20 of about 107 (78)

Four-body Gravitational Microlensing Events Involving Both a Binary Lens and a Binary Source

The Astrophysical Journal
We present detailed analyses of three anomalous microlensing events—KMT-2021-BLG-0209, KMT-2021-BLG-0901, and OGLE-2025-BLG-0356—identified from a systematic reexamination of KMTNet light curves for which previous modeling attempts failed or left ...
Cheongho Han, Chung-Uk Lee, Andrzej Udalski, (Leading Authors), 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, Seung-Lee Kim, Dong-Joo Lee, Sang-Mok Cha, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, Przemek Mróz, (KMTNet Collaboration), 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, (The OGLE Team)   +37 more
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First Resolution of Microlensed Images of a Binary-lens Event [PDF]

The Astrophysical Journal
We resolve the multiple images of the binary-lens microlensing event ASASSN-22av using the GRAVITY instrument of the Very Large Telescope Interferometer (VLTI).
Zexuan Wu, Subo Dong, A. Mérand, Christopher S. Kochanek, Przemek Mróz, Jinyi Shangguan, Grant Christie, Thiam-Guan Tan, Thomas Bensby, Joss Bland-Hawthorn, Sven Buder, Frank Eisenhauer, Andrew P. Gould, Janez Kos, Tim Natusch, Sanjib Sharma, Andrzej Udalski, J. Woillez, David A. H. Buckley, I. B. Thompson, Karim Abd El Dayem, Anthony Berdeu, Jean-Philippe Berger, Guillaume Bourdarot, Wolfgang Brandner, Richard I. Davies, Denis Defrère, Catherine Dougados, Antonia Drescher, Andreas Eckart, Maximilian Fabricius, Helmut Feuchtgruber, Natascha M. Förster Schreiber, Paulo Garcia, Reinhard Genzel, Stefan Gillessen, Gernot Heißel, Sebastian Hönig, Mathis Houlle, Pierre Kervella, Laura Kreidberg, Sylvestre Lacour, Olivier Lai, Romain Laugier, Jean-Baptiste Le Bouquin, James Leftley, Bruno Lopez, Dieter Lutz, Felix Mang, Florentin Millour, Miguel Montargès, Hugo Nowacki, Mathias Nowak, Thomas Ott, Thibaut Paumard, Karine Perraut, Guy Perrin, Romain Petrov, Pierre-Olivier Petrucci, Nicolas Pourre, Sebastian Rabien, Diogo C. Ribeiro, Sylvie Robbe-Dubois, Matteo Sadun Bordoni, Daryl Santos, Jonas Sauter, Jules Scigliuto, Taro T. Shimizu, Christian Straubmeier, Eckhard Sturm, Matthias Subroweit, Calvin Sykes, Linda Tacconi, Frédéric Vincent, Felix Widmann, the GRAVITY+ collaboration   +75 more
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Gaia20fnr: A binary-lens microlensing event with full orbital motion revealed by four space telescopes

Astronomy & Astrophysics
The microlensing event Gaia20fnr is a long-duration, non-caustic-crossing binary-lens event located at a high Galactic latitude. Triggered by a photometric rise detected by the Gaia space mission, the event was followed up with observations from multiple
Wicker M., Wyrzykowski Ł., Hundertmark M., Rybicki K. A., Zieliński P., Stonkutė E., Gromadzki M., Maskoliūnas M., Ihanec N., Ratajczak M., Bachelet E., Kruszyńska K., Dominik M., Buckley D. A. H., Gezer I., Chené A.-N., Mikołajczyk P., Kotysz K., Majumdar J., Pakštiene E., Zdanavičius J., Čepas V., Jonauskaitė U., Bozza V., Cassan A., Figuera Jaimes R., Rabus M., Rota P., Street R. A., Tsapras Y., Wambsganss J., Awiphan S., Brincat S. M., Budzik Z., Davidson J. W., Dymock R., Galdies C., Godunova V., Hambsch F.-J., Jablonska M., Kowalik P., Kvernadze T., Larma M., Makowska M., Markus Y., Merc J., Michniewicz O., Motylinski M., Popowicz A., Radziwonowicz M., Reichart D., Romanov F. D., Simon A. O., Trzcionkowski P., Wróbel E., Zejmo M., Zola S.   +56 more
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Binary-lens Microlensing Degeneracy: Impact on Planetary Sensitivity and Mass-ratio Function

The Astronomical Journal
Gravitational microlensing is a unique method for discovering cold planets across a broad mass range. Reliable statistics of the microlensing planets require accurate sensitivity estimates.
Yuxin Shang, Hongjing Yang, Jiyuan Zhang, Shude Mao, Andrew Gould, Weicheng Zang, Qiyue Qian, Jennifer C. Yee   +7 more
doaj   +3 more sources

Candidate Microlensing Brown Dwarfs in Binary Lens Systems from the 2023–2025 Observing Seasons

The Astronomical Journal
We present detailed light-curve analyses of 10 binary-lens microlensing events observed during the 2023–2025 seasons and selected as candidates for hosting brown dwarf companions.
Cheongho Han, Andrzej Udalski, Ian A. Bond, Chung-Uk Lee, (Leading authors), 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, Seung-Lee Kim, Dong-Joo Lee, Sang-Mok Cha, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, (KMTNet Collaboration), 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, (The OGLE Collaboration), Fumio Abe, David P. Bennett, Aparna Bhattacharya, Ryusei Hamada, Yuki Hirao, Asahi Idei, Stela Ishitani Silva, Shuma Makida, Shota Miyazaki, Yasushi Muraki, Tutumi Nagai, Togo Nagano, Seiya Nakayama, Mayu Nishio, Kansuke Nunota, Ryo Ogawa, Ryunosuke Oishi, Yui Okumoto, Greg Olmschenk, Clément Ranc, Nicholas J. Rattenbury, Yuki Satoh, Takahiro Sumi, Daisuke Suzuki, Takuto Tamaoki, Sean K. Terry, Paul J. Tristram, Aikaterini Vandorou, Hibiki Yama, (The MOA/PRIME Collaboration)   +68 more
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A Bayesian algorithm for model selection applied to caustic-crossing binary-lens microlensing events [PDF]

Monthly Notices of the Royal Astronomical Society, 2012
We present a full Bayesian algorithm designed to perform automated searches of the parameter space of caustic-crossing binary-lens microlensing events. This builds on previous work implementing priors derived from Galactic models and geometrical considerations.
Kains, N., Browne, P., Horne, K., Hundertmark, M., Cassan, A.   +4 more
openaire   +4 more sources

Compact binaries through a lens: Silent versus detectable microlensing for the LIGO-Virgo-KAGRA gravitational wave observatories

Physical Review D, 2023
17 pages, 12 Figures. Updated References. Submitted to Phys.
Ruxandra Bondarescu, Helena Ubach, Oleg Bulashenko, Andrew Lundgren   +3 more
openaire   +3 more sources

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

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

Possible Gravitational Microlensing Events in the Optical Lightcurve of Active Galaxy S5 0716+714

The Astrophysical Journal, 2023
A well-known active galaxy of the blazar type, S5 0716+714, is characterized by a particularly high-variability duty cycle on short timescales at optical frequencies.
D. Ł. Król, Ł. Stawarz, J. Krzesinski, C. C. Cheung   +3 more
doaj   +1 more source