Related papers: OGLE-2016-BLG-0693LB: Probing the Brown Dwarf Dese…

OGLE-2017-BLG-0329L: A Microlensing Binary Characterized with Dramatically Enhanced Precision Using Data from Space-based Observations

Mass measurements of gravitational microlenses require one to determine the microlens parallax $\pie$, but precise $\pie$ measurement, in many cases, is hampered due to the subtlety of the microlens-parallax signal combined with the…

Solar and Stellar Astrophysics · Physics 2018-06-06 C. Han , S. Calchi Novati , A. Udalski , C. -U. Lee , A. Gould , V. Bozza , P. Mróz , P. Pietrukowicz , J. Skowron , M. K. Szymański , R. Poleski , I. Soszyński , S. Kozłowski , K. Ulaczyk , M. Pawlak , K. Rybicki , P. Iwanek , M. D. Albrow , S. -J. Chung , K. -H. Hwang , Y. K. Jung , Y. -H. Ryu , I. -G. Shin , Y. Shvartzvald , J. C. Yee , W. Zang , W. Zhu , S. -M. Cha , D. -J. Kim , H. -W. Kim , S. -L. Kim , D. -J. Lee , Y. Lee , B. -G. Park , R. W. Pogge , W. -T. Kim , C. Beichman , G. Bryden , S. Carey , B. S. Gaudi , C. B. Henderson , M. Dominik , C. Helling , M. Hundertmark , U. G. Jørgensen , P. Longa-Peña , S. Lowry , S. Sajadian , M. J. Burgdorf , J. Campbell-White , S. Ciceri , D. F. Evans , L. K. Haikala , T. C. Hinse , S. Rahvar , M. Rabus , C. Snodgrass

Microlensing optical depth toward the Galactic Bulge using bright sources from OGLE-II

We present a measurement of the microlensing optical depth toward the Galactic Bulge based on 4 years of the OGLE-II survey using Red Clump Giant (RCG). Using 32 events we find tau=2.55_{-0.46}^{+0.57}* 10^{-6} at (l,b)=(1.16, -2.75).…

Astrophysics · Physics 2010-11-11 T. Sumi , P. R. Wozniak , A. Udalski , M. Szymanski , M. Kubiak , G. Pietrzynski , I. Soszy nski , K. Zebrun , O. Szewczyk , L. Wyrzykowski , B. Paczynski

MOA-2010-BLG-328Lb: a sub-Neptune orbiting very late M dwarf ?

We analyze the planetary microlensing event MOA-2010-BLG-328. The best fit yields host and planetary masses of Mh = 0.11+/-0.01 M_{sun} and Mp = 9.2+/-2.2M_Earth, corresponding to a very late M dwarf and sub-Neptune-mass planet,…

Earth and Planetary Astrophysics · Physics 2015-06-17 K. Furusawa , A. Udalski , T. Sumi , D. P. Bennett , I. A. Bond , A. Gould , U. G. Jorgensen , C. Snodgrass , D. Dominis Prester , M. D. Albrow , F. Abe , C. S. Botzler , P. Chote , M. Freeman , A. Fukui , P. Harris , Y. Itow , C. H. Ling , K. Masuda , Y. Matsubara , N. Miyake , Y. Muraki , K. Ohnishi , N. J. Rattenbury , To. Saito , D. J. Sullivan , D. Suzuki , W. L. Sweatman , P. J. Tristram , K. Wada , P. C. M. Yock , M. K. Szymanski , I. Soszynski , M. Kubiak , R. Poleski , K. Ulaczyk , G. Pietrzynski , L. Wyrzykowski , J. Y. Choi , G. W. Christie , D. L. DePoy , S. Dong , J. Drummond , B. S. Gaudi , C. Han , L. -W. Hung , Y. -K. Jung , C. -U. Lee , J. McCormick , D. Moorhouse , T. Natusch , M. Nola , E. Ofek , B. G. Park , H. Park , R. W. Pogge , I. -G. Shin , J. Skowron , G. Thornley , J. C. Yee , K. A. Alsubai , V. Bozza , P. Browne , M. J. Burgdorf , S. Calchi Novati , P. Dodds , M. Dominik , F. Finet , T. Gerner , S. Hardis , K. Harpsoe , T. C. Hinse , M. Hundertmark , N. Kains , E. Kerins , C. Liebig , L. Mancini , M. Mathiasen , M. T. Penny , S. Proft , S. Rahvar , D. Ricci , G. Scarpetta , S. Schafer , F. Schonebeck , J. Southworth , J. Surdej , J. Wambsganss , R. A. Street , D. M. Bramich , I. A. Steele , Y. Tsapras , K. Horne , J. Donatowicz , K. C. Sahu , E. Bachelet , V. Batista , T. G. Beatty , J. -P. Beaulieu , C. S. Bennett , C. Black , R. Bowens-Rubin , S. Brillant , J. A. R. Caldwell , A. Cassan , A. A. Cole , E. Corrales , C. Coutures , S. Dieters , P. Fouque , J. Greenhill , C. B. Henderson , D. Kubas , J. -B. Marquette , R. Martin , J. W. Menzies , B. Shappee , A. Williams , D. Wouters , J. van Saders , R. Zellem , M. Zub

Lensing of unresolved stars towards the Galactic Bulge

Previous calculations of the rates and optical depths due to microlensing only considered resolved stars. However, if a faint unresolved star lens is close enough to a resolved star, the event will be seen by the microlensing experiments…

Astrophysics · Physics 2007-05-23 C. Alard

Extreme Magnification Microlensing Event OGLE-2008-BLG-279: Strong Limits on Planetary Companions to the Lens Star

We analyze the extreme high-magnification microlensing event OGLE-2008-BLG-279, which peaked at a maximum magnification of A ~ 1600 on 30 May 2008. The peak of this event exhibits both finite-source effects and terrestrial parallax, from…

Earth and Planetary Astrophysics · Physics 2015-05-13 J. C. Yee , A. Udalski , T. Sumi , Subo Dong , S. Kozłowski , J. C. Bird , A. Cole , D. Higgins , J. McCormick , B. Monard , D. Polishook , A. Shporer , O. Spector , the OGLE , the microFUN , the MOA , the PLANET Collaboration

KMT-2022-BLG-0475Lb and KMT-2022-BLG-1480Lb: Microlensing ice giants detected via non-caustic-crossing channel

We investigate the microlensing data collected in the 2022 season from the high-cadence microlensing surveys in order to find weak signals produced by planetary companions to lenses. From these searches, we find that two lensing events…

Earth and Planetary Astrophysics · Physics 2023-07-04 Cheongho Han , Chung-Uk Lee , Ian A. Bond , Weicheng Zang , Sun-Ju Chung , Michael D. Albrow , Andrew Gould , Kyu-Ha Hwang , Youn Kil Jung , Yoon-Hyun Ryu , In-Gu Shin , Yossi Shvartzvald , Hongjing Yang , Jennifer C. Yee , Sang-Mok Cha , Doeon Kim , Dong-Jin Kim , Seung-Lee Kim , Dong-Joo Lee , Yongseok Lee , Byeong-Gon Park , Richard W. Pogge , Shude Mao , Wei Zhu , Fumio Abe , Richard Barry , David P. Bennett , Aparna Bhattacharya , Hirosame Fujii , Akihiko Fukui , Ryusei Hamada , Yuki Hirao , Stela Ishitani Silva , Yoshitaka Itow , Rintaro Kirikawa , Iona Kondo , Naoki Koshimoto , Yutaka Matsubara , Shota Miyazaki , Yasushi Muraki , Greg Olmschenk , Clément Ranc , Nicholas J. Rattenbury , Yuki Satoh , Takahiro Sumi , Daisuke Suzuki , Taiga Toda , Mio Tomoyoshi , Paul J. Tristram , Aikaterini Vandorou , Hibiki Yama , Kansuke Yamashita

Microlensing Events in the Galactic Plane Using the Zwicky Transient Facility

Microlensing is a powerful technique to study the Galactic population of "dark" objects such as exoplanets both bound and unbound, brown dwarfs, low-luminosity stars, old white dwarfs, neutron stars, and almost the only way to study…

Solar and Stellar Astrophysics · Physics 2022-03-30 Antonio C. Rodriguez , Przemek Mróz , Shrinivas R. Kulkarni , Igor Andreoni , Eric C. Bellm , Richard Dekany , Andrew J. Drake , Dmitry A. Duev , Frank J. Masci , Thomas A. Prince , Reed Riddle , David L. Shupe

OGLE-2015-BLG-1482L: the first isolated low-mass microlens in the Galactic bulge

We analyze the single microlensing event OGLE-2015-BLG-1482 simultaneously observed from two ground-based surveys and from \textit{Spitzer}. The \textit{Spitzer} data exhibit finite-source effects due to the passage of the lens close to or…

Solar and Stellar Astrophysics · Physics 2017-04-12 S. -J. Chung , W. Zhu , A. Udalski , C. -U. Lee , Y. -H. Ryu , Y. K. Jung , I. -G. Shin , J. C. Yee , K. -H. Hwang , A. Gould , M. Albrow , S. -M. Cha , C. Han , D. -J. Kim , H. -W. Kim , S. -L. Kim , Y. -H. Kim , Y. Lee , B. -G. Park , R. W. Pogge , R. Poleski , P. Mróz , P. Pietrukowicz , J. Skowron , M. K. Szymański , I. Soszyński , S. Kozłowski , K. Ulaczyk , M. Pawlak , C. Beichman , G. Bryden , S. Calchi Novati , S. Carey , M. Fausnaugh , B. S. Gaudi , Calen B. Henderson , Y. Shvartzvald , B. Wibking

KMT-2018-BLG-0748Lb: Sub-Saturn Microlensing Planet Orbiting an Ultracool Host

We announce the discovery of a microlensing planetary system, in which a sub-Saturn planet is orbiting an ultracool dwarf host. We detect the planetary system by analyzing the short-timescale ($t_{\rm E}\sim 4.4$~days) lensing event…

Earth and Planetary Astrophysics · Physics 2020-07-13 Cheongho Han , In-Gu Shin , Youn Kil Jung , Doeon Kim , Jennifer C. Yee , Michael D. Albrow , Sun-Ju Chung , Andrew Gould , Kyu-Ha Hwang , Chung-Uk Lee , Yoon-Hyun Ryu , Yossi Shvartzvald , Weicheng Zang , Sang-Mok Cha , Dong-Jin Kim , Hyoun-Woo Kim , Seung-Lee Kim , Dong-Joo Lee , Yongseok Lee , Byeong-Gon Park , Richard W. Pogge

Spectroscopic characterisation of microlensing events Towards a new interpretation of OGLE-2011-BLG-0417

The microlensing event OGLE-2011-BLG-0417 is an exceptionally bright lens binary that was predicted to present radial velocity variation at the level of several km/s. Pioneer radial velocity follow-up observations with the UVES spectrograph…

Earth and Planetary Astrophysics · Physics 2016-11-23 A. Santerne , J. -P. Beaulieu , B. Rojas Ayala , I. Boisse , E. Schlawin , J. -M. Almenara , V. Batista , D. Bennett , R. F. Díaz , P. Figueira , D. J. James , T. Herter , J. Lillo-Box , J. B. Marquette , C. Ranc , N. C. Santos , S. G. Sousa

MOA-2016-BLG-227Lb: A Massive Planet Characterized by Combining Lightcurve Analysis and Keck AO Imaging

We report the discovery of a microlensing planet --- MOA-2016-BLG-227Lb --- with a large planet/host mass ratio of $q \simeq 9 \times 10^{-3}$. This event was located near the $K2$ Campaign 9 field that was observed by a large number of…

Earth and Planetary Astrophysics · Physics 2017-06-28 Naoki Koshimoto , Yossi Shvartzvald , David Bennett , Matthew Penny , Markus Hundertmark , Ian A. Bond , Weicheng Zang , Calen Henderson , Daisuke Suzuki , Nicholas J. Rattenbury , Takahiro Sumi , Fumio Abe , Yuichiro Asakura , Aparna Bhattacharya , Akihiko Fukui , Yuki Hirao , Yoshitaka Itow , M. C. A. Li , C. Ling , Kimiaki Masuda , Y. Matsubara , Taro Matsuo , Yasushi Muraki , Masayuki Nagakane , Kouji Ohnishi , C. Ranc , To. Saito , A. Sharan , Hiroshi Shibai , Denis Sullivan , P. Tristram , A. Yonehara , Christopher Gelino , Charles Beichman , Jean-Philippe Beaulieu , J. -B. Marquette , Virginie Batista , M. Friedmann , N. Hallakoun , Shai Kaspi , Dani Maoz , G. Bryden , Sebastiano Calchi Novati , Steve Howell , T. Wang , Shude Mao , Pascal Fouque , Heidi Korhonen , Uffe Jorgensen , Rachel Street , Yiannis Tsapras , Martin Dominik , Eamonn Kerins , Arnaud Cassan , Colin Snodgrass , Etienne Bachelet , Valerio Bozza , D. M. Bramich

An Isolated Microlens Observed from K2, Spitzer and Earth

We present the result of microlensing event MOA-2016-BLG-290, which received observations from the two-wheel Kepler (K2), Spitzer, as well as ground-based observatories. A joint analysis of data from K2 and the ground leads to two…

Earth and Planetary Astrophysics · Physics 2017-11-15 Wei Zhu , A. Udalski , C. Huang , S. Calchi Novati , T. Sumi , R. Poleski , J. Skowron , P. Mroz , M. K. Szymanski , I. Soszynski , P. Pietrukowicz , S. Kozlowski , K. Ulaczyk , M. Pawlak , C Beichman , G. Bryden , S. Carey , B. S. Gaudi , A. Gould , C. B. Henderson , Y. Shvartzvald , J. C. Yee , I. A. Bond , D. P. Bennett , D. Suzuki , N. J. Rattenbury , N. Koshimoto , F. Abe , Y. Asakura , R. K. Barry , A. Bhattacharya , M. Donachie , P. Evans , A. Fukui , Y. Hirao , Y. Itow , K. Kawasaki , M. C. A. Li , C. H. Ling , K. Masuda , Y. Matsubara , S. Miyazaki , H. Munakata , Y. Muraki , M. Nagakane , K. Ohnishi , C. Ranc , To. Saito , A. Sharan , D. J. Sullivan , P. J. Tristram , T. Yamada , A. Yonehara

Red noise versus planetary interpretations in the microlensing event OGLE-2013-BLG-446

For all exoplanet candidates, the reliability of a claimed detection needs to be assessed through a careful study of systematic errors in the data to minimize the false positives rate. We present a method to investigate such systematics in…

Earth and Planetary Astrophysics · Physics 2015-10-29 E. Bachelet , D. M. Bramich , C. Han , J. Greenhill , R. A. Street , A. Gould , G. D Ago , K. AlSubai , M. Dominik , R. Figuera Jaimes , K. Horne , M. Hundertmark , N. Kains , C. Snodgrass , I. A. Steele , Y. Tsapras , M. D. Albrow , V. Batista , J. -P. Beaulieu , D. P. Bennett , S. Brillant , J. A. R. Caldwell , A. Cassan , A. Cole , C. Coutures , S. Dieters , D. Dominis Prester , J. Donatowicz , P. Fouque , K. Hill , J. -B. Marquette , J. Menzies , C. Pere , C. Ranc , J. Wambsganss , D. Warren , L. Andrade de Almeida , J. -Y. Choi , D. L. DePoy , Subo Dong , L. -W. Hung , K. H. Hwang , F. Jablonski , Y. K. Jung , S. Kaspi , N. Klein , C. -U. Lee , D. Maoz , J. A. Munoz , D. Nataf , H. Park , R. W. Pogge , D. Polishook , I. -G. Shin , A. Shporer , J. C. Yee F. Abe , A. Bhattacharya , I. A. Bond , C. S. Botzler , M. Freeman , A. Fukui , Y. Itow , N. Koshimoto , C. H. Ling , K. Masuda , Y. Matsubara , Y. Muraki , K. Ohnishi , L. C. Philpott , N. Rattenbury , To. Saito , D. J. Sullivan , T. Sumi , D. Suzuki , P. , J. Tristram , A. Yonehara , V. Bozza , S. Calchi Novati , S. Ciceri , P. Galianni , S. H. Gu , K. Harpsoe , T. C. Hinse , U. G. Jorgensen , D. Juncher , H. Korhonen , L. Mancini , C. Melchiorre , A. Popovas , A. Postiglione , M. Rabus , S. Rahvar , R. W. Schmidt , G. Scarpetta , J. Skottfelt , John Southworth , An. Stabile , J. Surdej , X. -B. Wang , O. Wertz

Revisiting the microlensing event OGLE 2012-BLG-0026: A solar mass star with two cold giant planets

Two cold, gas giant planets orbiting a G-type main sequence star in the galactic disk have previously been discovered in the high magnification microlensing event OGLE-2012-BLG-0026 (Han et al. 2013). Here we present revised host star flux…

Earth and Planetary Astrophysics · Physics 2016-06-22 J. P. Beaulieu , D. P. Bennett , V. Batista , A. Fukui , J. -B. Marquette , S. Brillant , A. A. Cole , L. A. Rogers , T. Sumi , F. Abe , A. Bhattacharya , N. Koshimoto , D. Suzuki , P. J. Tristram , C. Han , A. Gould , R. Pogge , J. Yee

Microlensing

Microlensing observations have now become a useful tool in searching for non--luminous astrophysical compact objects (brown dwarfs, faint stars, neutron stars, black holes and even planets). Originally conceived for establishing whether the…

Astrophysics · Physics 2016-08-30 E. Roulet , S. Mollerach

OGLE-2017-BLG-0537: Microlensing Event with a Resolvable Lens in $\lesssim 5$ years from High-resolution Follow-up Observations

We present the analysis of the binary-lens microlensing event OGLE-2017-BLG-0537. The light curve of the event exhibits two strong caustic-crossing spikes among which the second caustic crossing was resolved by high-cadence surveys. It is…

Solar and Stellar Astrophysics · Physics 2018-08-15 Y. K. Jung , C. Han , A. Udalski , A. Gould , M. D. Albrow , S. -J. Chung , K. -H. Hwang , C. -U. Lee , Y. -H. Ryu , I. -G. Shin , Y. Shvartzvald , J. C. Yee , W. Zang , W. Zhu , S. -M. Cha , D. -J. Kim , H. -W. Kim , S. -L. Kim , D. -J. Lee , Y. Lee , B. -G. Park , R. W. Pogge , W. -T. Kim , P. Mróz , R. Poleski , J. Skowron , M. K. Szymański , I. Soszyński , S. Kozłowski , P. Pietrukowicz , K. Ulaczyk , M. Pawlak

Triple Microlens OGLE-2008-BLG-092L: Binary Stellar System with a Circumprimary Uranus-type Planet

We present the gravitational microlensing discovery of a 4 M_Uranus planet that orbits a 0.7 M_Sun star at ~18 AU. This is the first known analog of Uranus. Similar planets, i.e., cold ice-giants, are inaccessible to either radial velocity…

Earth and Planetary Astrophysics · Physics 2015-06-26 Radosław Poleski , Jan Skowron , Andrzej Udalski , Cheongho Han , Szymon Kozłowski , Łukasz Wyrzykowski , Subo Dong , Michał K. Szymański , Marcin Kubiak , Grzegorz Pietrzyński , Igor Soszyński , Krzysztof Ulaczyk , Paweł Pietrukowicz , Andrew Gould

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

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 re-examination of KMTNet light curves for which previous modeling attempts…

Solar and Stellar Astrophysics · Physics 2026-05-19 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 , Seung-Lee Kim , Dong-Joo Lee , Sang-Mok Cha , Yongseok Lee , Byeong-Gon Park , Richard W. Pogge , Przemek Mróz , Michał K. Szymańskim Jan Skowron , Radosław Poleski , Igor Soszyński , Paweł Pietrukowicz , Szymon Kozłowski , Krzysztof A. Rybicki , Patryk Iwanek , Krzysztof Ulaczyk , Marcin Wrona , Mariusz Gromadzki , Mateusz J. Mróz

Microlensing optical depth and event rate toward the Galactic bulge from 8 yr of OGLE-IV observations

The number and properties of observed gravitational microlensing events depend on the distribution and kinematics of stars and other compact objects along the line of sight. In particular, precise measurements of the microlensing optical…

Solar and Stellar Astrophysics · Physics 2019-10-14 P. Mroz , A. Udalski , J. Skowron , M. K. Szymanski , I. Soszynski , L. Wyrzykowski , P. Pietrukowicz , S. Kozlowski , R. Poleski , K. Ulaczyk , K. Rybicki , P. Iwanek

Binary Lenses in OGLE-II 1997-1999 Database. A Preliminary Study

We present 18 binary lens candidates from OGLE-II database for seasons 1997-1999. The candidates have been selected by visual light curves inspection from the subsample of strong transient events; the same procedure gives 215 single lens…

Astrophysics · Physics 2007-05-23 M. Jaroszynski