Related papers: Real-Time Difference Imaging Analysis of MOA Galac…

Magnification Bias in Galactic Microlensing Searches

It is shown that a significant amount of detectable gravitational microlensing events that could potentially be found by MAssively Parallel Photometry (MAPP) projects (such as the MACHO, EROS and OGLE collaborations) will occur for stars…

Astrophysics · Physics 2009-10-22 Robert J. Nemiroff

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

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…

Solar and Stellar Astrophysics · Physics 2015-05-18 G. Ingrosso , S. Calchi-Novati , F. De Paolis , Ph. Jetzer , A. A. Nucita , A. F. Zakharov

Imaging dark matter at the smallest scales with $z\approx1$ lensed stars

Observations of caustic-crossing galaxies at redshift $0.7<z<1$ show a wealth of transient events. Most of them are believed to be microlensing events of highly magnified stars. Earlier work predicted such events should be common near the…

Cosmology and Nongalactic Astrophysics · Physics 2024-09-18 J. M. Diego , Sung Kei Li , Alfred Amruth , Ashish K. Meena , Tom J. Broadhurst , Patrick L. Kelly , Alexei V. Filippenko , Liliya L. R. Williams , Adi Zitrin , William E. Harris , Marta Reina-Campos , Carlo Giocoli , Liang Dai , Mitchell F. Struble , Tommaso Treu , Yoshinobu Fudamoto , Daniel Gilman , Anton M. Koekemoer , Jeremy Lim , J. M. Palencia , Fengwu Sun , Rogier A. Windhorst

Characterizing Lenses and Lensed Stars of High-Magnification Single-lens Gravitational Microlensing Events With Lenses Passing Over Source Stars

We present the analysis of the light curves of 9 high-magnification single-lens gravitational microlensing events with lenses passing over source stars, including OGLE-2004-BLG-254, MOA-2007-BLG-176, MOA-2007-BLG-233/OGLE-2007-BLG-302,…

Solar and Stellar Astrophysics · Physics 2015-06-03 J. -Y. Choi , I. -G. Shin , S. -Y. Park , C. Han , A. Gould , T. Sumi , A. Udalski , J. -P. Beaulieu , R. Street , M. Dominik , W. Allen , L. A. Almeida , M. Bos , G. W. Christie , D. L. Depoy , S. Dong , J. Drummond , A. Gal-Yam , B. S. Gaudi , C. B. Henderson , L. -W. Hung , F. Jablonski , J. Janczak , C. -U. Lee , F. Mallia , A. Maury , J. McCormick , D. McGregor , L. A. G. Monard , D. Moorhouse , J. A. Muñoz , T. Natusch , C. Nelson , B. -G. Park , R. W. Pogge , T. -G. "TG" Tan , G. Thornley , J. C. Yee , F. Abe , E. Barnard , J. Baudry , D. P. Bennett , I. A. Bond , C. S. Botzler , M. Freeman , A. Fukui , K. Furusawa , F. Hayashi , J. B. Hearnshaw , S. Hosaka , Y. Itow , K. Kamiya , P. M. Kilmartin , S. Kobara , A. Korpela , W. Lin , C. H. Ling , S. Makita , K. Masuda , Y. Matsubara , N. Miyake , Y. Muraki , M. Nagaya , K. Nishimoto , K. Ohnishi , T. Okumura , K. Omori , Y. C. Perrott , N. Rattenbury , To. Saito , L. Skuljan , D. J. Sullivan , D. Suzuki , K. Suzuki , W. L. Sweatman , S. Takino , P. J. Tristram , K. Wada , P. C. M. Yock , M. K. Szymański , M. Kubiak , G. Pietrzyński , I. Soszyński , R. Poleski , K. Ulaczyk , Ł. Wyrzykowski , S. Kozłowski , P. Pietrukowicz , M. D. Albrow , E. Bachelet , V. Batista , C. S. Bennett , R. Bowens-Rubin , S. Brillant , A. Cassan , A. Cole , E. Corrales , Ch. Coutures , S. Dieters , D. Dominis Prester , J. Donatowicz , P. Fouqué , J. Greenhill , S. R. Kane , J. Menzies , K. C. Sahu , J. Wambsganss , A. Williams , M. Zub , A. Allan , D. M. Bramich , P. Browne , N. Clay , S. Fraser , K. Horne , N. Kains , C. Mottram , C. Snodgrass , I. Steele , Y. Tsapras , K. A. Alsubai , V. Bozza , M. J. Burgdorf , S. Calchi Novati , P. Dodds , S. Dreizler , F. Finet , T. Gerner , M. Glitrup , F. Grundahl , S. Hardis , K. Harpsøe , T. C. Hinse , M. Hundertmark , U. G. Jørgensen , E. Kerins , C. Liebig , G. Maier , L. Mancini , M. Mathiasen , M. T. Penny , S. Proft , S. Rahvar , D. Ricci , G. Scarpetta , S. Schäfer , F. Schönebeck , J. Skottfelt , J. Surdej , J. Southworth , F. Zimmer

The Optical Gravitational Lensing Experiment. Dwarf Novae in the OGLE Data. I. Three New Dwarf Novae: One in the Period Gap and Two Longer Period Objects

We report serendipitous discovery of three new dwarf novae which eruptions in 2010 were observed by the ongoing microlensing survey OGLE-IV. All three objects are located in the Galactic bulge fields observed with the highest cadence of 20…

Solar and Stellar Astrophysics · Physics 2011-07-14 R. Poleski , A. Udalski , J. Skowron , M. K. Szymański , M. Kubiak , G. Pietrzyński , I. Soszyński , S. Kozłowski , P. Pietrukowicz , Ł. Wyrzykowski , K. Ulaczyk

On rates of supernovae strongly lensed by galactic haloes in Millennium Simulation

We make use of publicly available results from N-body Millennium Simulation to create mock samples of lensed supernovae type Ia and core-collapse. Simulating galaxy-galaxy lensing we derive the rates of lensed supernovae and find than at…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-12 Zuzanna Kostrzewa-Rutkowska , Lukasz Wyrzykowski , Michal Jaroszynski

OGLE-2005-BLG-153: Microlensing Discovery and Characterization of A Very Low Mass Binary

The mass function and statistics of binaries provide important diagnostics of the star formation process. Despite this importance, the mass function at low masses remains poorly known due to observational difficulties caused by the…

Solar and Stellar Astrophysics · Physics 2015-05-19 K. -H. Hwang , A. Udalski , C. Han , Y. -H. Ryu , I. A. Bond , J. -P. Beaulieu , M. Dominik , K. Horne , A. Gould , B. S. Gaudi , M. Kubiak , M. K. Szymanski , G. Pietrzynski , I. Soszynski , O. Szewczyk , K. Ulaczyk , L. Wyrzykowski , F. Abe , C. S. Botzler , J. B. Hearnshaw , Y. Itow , K. Kamiya , P. M. Kilmartin , K. Masuda , Y. Matsubara , M. Motomura , Y. Muraki , S. Nakamura , K. Ohnishi , C. Okada , N. Rattenbury , To. Saito , T. Sako , M. Sasaki , D. J. Sullivan , T. Sumi , P. J. Tristram , J. N. Wood , P. C. M. Yock , T. Yoshioka , M. Albrow , D. P. Bennett , D. M. Bramich , S. Brillant , J. A. R. Caldwell , J. J. Calitz , A. Cassan , K. H. Cook , E. Corrales , C. Coutures , M. Desort , S. Dieters , D. Dominis , J. Donatowicz , P. Fouque , J. Greenhill , K. Harpsoe , K. Hill , M. Hoffman , U. G. Jorgensen , S. Kane , D. Kubas , R. Martin , J. -B. Marquette , P. Meintjes , J. Menzies , K. Pollard , K. Sahu , I. Steele , C. Vinter , J. Wambsganss , A. Williams , K. Woller , M. Burgdorf , C. Snodgrass , M. Bode , D. L. Depoy , C. -U. Lee , B. -G. Park , R. W. Pogge

MOA-2010-BLG-311: A planetary candidate below the threshold of reliable detection

We analyze MOA-2010-BLG-311, a high magnification (A_max>600) microlensing event with complete data coverage over the peak, making it very sensitive to planetary signals. We fit this event with both a point lens and a 2-body lens model and…

Earth and Planetary Astrophysics · Physics 2015-06-11 J. C. Yee , L. -W. Hung , I. A. Bond , W. Allen , L. A. G. Monard , M. D. Albrow , P. Fouque , M. Dominik , Y. Tsapras , A. Udalski , A. Gould , R. Zellem , M. Bos , G. W. Christie , D. L. DePoy , Subo Dong , J. Drummond , B. S. Gaudi , E. Gorbikov , C. Han , S. Kaspi , N. Klein , C. -U. Lee , D. Maoz , J. McCormick , D. Moorhouse , T. Natusch , M. Nola , B. -G. Park , R. W. Pogge , D. Polishook , A. Shporer , Y. Shvartzvald , J. Skowron , G. Thornley , F. Abe , D. P. Bennett , C. S. Botzler , P. Chote , M. Freeman , A. Fukui , K. Furusawa , P. Harris , Y. Itow , C. H. Ling , K. Masuda , Y. Matsubara , N. Miyake , K. Ohnishi , N. J. Rattenbury , To. Saito , D. J. Sullivan , T. Sumi , 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 , E. Bachelet , V. Batista , T. G. Beatty , J. -P. Beaulieu , C. S. Bennett , R. Bowens-Rubin , S. Brillant , J. A. R. Caldwell , A. Cassan , A. A. Cole , E. Corrales , C. Coutures , S. Dieters , D. Dominis Prester , J. Donatowicz , J. Greenhill , C. B. Henderson , D. Kubas , J. -B. Marquette , R. Martin , J. W. Menzies , B. Shappee , A. Williams , D. Wouters , J. van Saders , M. Zub , R. A. Street , K. Horne , D. M. Bramich , I. A. Steele , K. A. Alsubai , V. Bozza , P. Browne , M. J. Burgdorf , S. Calchi Novati , P. Dodds , F. Finet , T. Gerner , S. Hardis , K. Harpsoe , F. V. Hessman , T. C. Hinse , M. Hundertmark , U. G. Jorgensen , N. Kains , E. Kerins , C. Liebig , L. Mancini , M. Mathiasen , M. T. Penny , S. Proft , S. Rahvar , D. Ricci , K. C. Sahu , G. Scarpetta , S. Schafer , F. Schonebeck , C. Snodgrass , J. Southworth , J. Surdej , J. Wambsgans

Preliminary Abundance Analysis of Galactic Bulge Main Sequence, Subgiant, and Giant Branch Stars Observed During Microlensing with Keck/HIRES

We present an abundance analysis of six main sequence turnoff, subgiant, and giant branch stars toward the Galactic bulge that were observed with Keck/HIRES during microlensing events. This is an early look at the first detailed chemical…

Astrophysics · Physics 2009-11-07 R. M. Cavallo , K. H. Cook , D. Minniti , T. Vandehei

Short-timescale Fluctuations in the Difference Light Curves of QSO 0957+561A,B: Microlensing or Noise?

From optical R band data of the double quasar QSO 0957+561A,B, we made two new difference light curves (about 330 days of overlap between the time-shifted light curve for the A image and the magnitude-shifted light curve for the B image).…

Astrophysics · Physics 2009-10-31 Rodrigo Gil-Merino , Luis J. Goicoechea , Miquel Serra-Ricart , Alex Oscoz , David Alcalde , Evencio Mediavilla

OGLE 2008--BLG--290: An accurate measurement of the limb darkening of a Galactic Bulge K Giant spatially resolved by microlensing

Gravitational microlensing is not only a successful tool for discovering distant exoplanets, but it also enables characterization of the lens and source stars involved in the lensing event. In high magnification events, the lens caustic may…

Solar and Stellar Astrophysics · Physics 2015-05-18 P. Fouque , D. Heyrovsky , S. Dong , A. Gould , A. Udalski , M. D. Albrow , V. Batista , J. -P. Beaulieu , D. P. Bennett , I. A. Bond , D. M. Bramich , S. Calchi Novati , A. Cassan , C. Coutures , S. Dieters , M. Dominik , D. Dominis Prester , J. Greenhill , K. Horne , U. G. Jorgensen , S. Kozlowski , D. Kubas , C. -H. Lee , J. -B. Marquette , M. Mathiasen , J. Menzies , L. A. G. Monard , S. Nishiyama , I. Papadakis , R. Street , T. Sumi , A. Williams , J. C. Yee , S. Brillant , J. A. R. Caldwell , A. Cole , K. H. Cook , J. Donatowicz , N. Kains , S. R. Kane , R. Martin , K. R. Pollard , K. C. Sahu , Y. Tsapras , J. Wambsganss , M. Zub , D. L. DePoy , B. S. Gaudi , C. Han , C. -U. Lee , B. -G. Park , R. W. Pogge , M. Kubiak , M. K. Szymanski , G. Pietrzynski , I. Soszynski , O. Szewczyk , K. Ulaczyk , L. Wyrzykowski , F. Abe , A. Fukui , K. Furusawa , A. C. Gilmore , J. B. Hearnshaw , Y. Itow , K. ~Kamiya , P. M. Kilmartin , A. V. Korpela , W. Lin , C. H. Ling , K. Masuda , Y. Matsubara , N. Miyake , Y. Muraki , M. Nagaya , K. Ohnishi , T. Okumura , Y. Perrott , N. J. Rattenbury , To. Saito , T. Sako , S. Sato , L. Skuljan , D. Sullivan , W. Sweatman , P. J. Tristram , P. C. M. Yock , A. Allan , M. F. Bode , M. J. Burgdorf , N. Clay , S. N. Fraser , E. Hawkins , E. Kerins , T. A. Lister , C. J. Mottram , E. S. Saunders , C. Snodgrass , I. A. Steele , P. J. Wheatley , T. Anguita , V. Bozza , K. Harpsoe , T. C. Hinse , M. Hundertmark , P. Kjaergaard , C. Liebig , L. Mancini , G. Masi , S. Rahvar , D. Ricci , G. Scarpetta , J. Southworth , J. Surdej , C. C. Thone , A. Riffeser , S. ~Seitz , R. Bender

The OGLE-III planet detection efficiency from six years of microlensing observations (2003 to 2008)

We use six years (2003 to 2008) of Optical Gravitational Lensing Experiment III microlensing observations to derive the survey detection efficiency for a range of planetary masses and projected distances from the host star. We perform an…

Earth and Planetary Astrophysics · Physics 2016-02-09 Y. Tsapras , M. Hundertmark , Ł. Wyrzykowski , K. Horne , A. Udalski , C. Snodgrass , R. Street , D. M. Bramich , M. Dominik , V. Bozza , R. Figuera Jaimes , N. Kains , J. Skowron , M. K. Szymański , G. Pietrzyński , I. Soszyński , K. Ulaczyk , S. Kozłowski , P. Pietrukowicz , R. Poleski

A Puzzle Involving Galactic Bulge Microlensing Events

We study a sample of 16 microlensed Galactic bulge main sequence turnoff region stars for which high dispersion spectra have been obtained with detailed abundance analyses. We demonstrate that there is a very strong and highly statistically…

Astrophysics of Galaxies · Physics 2015-05-14 Judith G. Cohen , Andrew Gould , Ian B. Thompson , Sofia Feltzing , Thomas Bensby , Jennifer A. Johnson , Wenjin Huang , Jorge Melendez , Sara Lucatello , Martin Asplund

Automated detection and modeling of binary microlensing events in OGLE-IV data. I. Events with well-separated bumps

Gravitational microlensing depends primarily on the lens mass and presents a larger occurrence rate in crowded regions, which makes it the best tool to uncover the initial mass function (IMF) of low-mass stars in the Galactic bulge. The…

Astrophysics of Galaxies · Physics 2025-06-12 R. A. P. Oliveira , R. Poleski , P. Mróz , A. Udalski , J. Skowron , M. Mróz , M. K. Szymański , I. Soszyński , K. Ulaczyk , P. Pietrukowicz , K. Rybicki , P. Iwanek , M. Wrona , M. Gromadzki

Statistical Microlensing Toward Magnified High-Redshift Star Clusters

We study light variability of gravitationally magnified high-redshift star clusters induced by a foreground population of microlenses. This arises as the incoherent superposition of light variations from a large number of source stars…

Astrophysics of Galaxies · Physics 2021-01-13 Liang Dai

A Possible Planetary Event OGLE-2002-BLG-055

The microlensing event OGLE-2002-BLG-055 has a single, but very reliable data point, deviating upward from a single source microlensing light curve by 0.6 mag. The simplest interpretation calls for a binary lens with a strong parallax…

Astrophysics · Physics 2007-05-23 M. Jaroszynski , B. Paczynski

Constraining the Location of Microlensing Objects towards the LMC through Parallax Measurement in EAGLE Observations

We investigate the possibility of determining whether microlensing objects towards the Large Magellanic Cloud (LMC) are in a Galactic thick disc, or are in a Galactic halo, by using parallax measurements with an Earth-radius scale baseline.…

Astrophysics · Physics 2009-11-07 T. Sumi , Y. Kan-ya

On the accuracy of mass measurement for microlensing black holes as seen by Gaia and OGLE

We investigate the impact of combining Gaia astrometry from space with precise, high cadence OGLE photometry from the ground. For the archival event OGLE3-ULENS-PAR-02, which is likely a black hole, we simulate a realistic astrometric…

Solar and Stellar Astrophysics · Physics 2018-03-14 Krzysztof A. Rybicki , Łukasz Wyrzykowski , Jakub Klencki , Jos de Bruijne , Krzysztof Belczyński , Martyna Chruślińska

Recent Microlensing Results from the MACHO Project

We describe a few recent microlensing results from the MACHO Collaboration. The aim of the MACHO Project was the identification and quantitative description of dark and luminous matter in the Milky Way using microlensing toward the…

Astrophysics · Physics 2007-05-23 P. Popowski , C. A. Nelson , D. P. Bennett , A. J. Drake , T. Vandehei , K. Griest , K. H. Cook , C. Alcock , R. A. Allsman , D. R. Alves , T. S. Axelrod , A. C. Becker , K. C. Freeman , M. Geha , M. J. Lehner , S. L. Marshall , D. Minniti , B. A. Peterson , P. J. Quinn , C. W. Stubbs , W. Sutherland , D. Welch

Flashlights: More than A Dozen High-Significance Microlensing Events of Extremely Magnified Stars in Galaxies at Redshifts z=0.7-1.5

Once only accessible in nearby galaxies, we can now study individual stars across much of the observable universe aided by galaxy-cluster gravitational lenses. When a star, compact object, or multiple such objects in the foreground…

Cosmology and Nongalactic Astrophysics · Physics 2022-11-08 Patrick L. Kelly , Wenlei Chen , Amruth Alfred , Thomas J. Broadhurst , Jose M. Diego , Najmeh Emami , Alexei V. Filippenko , Allison Keen , Sung Kei Li , Jeremy Lim , Ashish K. Meena , Masamune Oguri , Claudia Scarlata , Tommaso Treu , Hayley Williams , Liliya L. R. Williams , Rui Zhou , Adi Zitrin , Ryan J. Foley , Saurabh W. Jha , Nick Kaiser , Vihang Mehta , Steven Rieck , Laura Salo , Nathan Smith , Daniel R. Weisz