Related papers: MOA-2007-BLG-197: Exploring the brown dwarf desert

Astrometric planet search around southern ultracool dwarfs I: First results, including parallaxes of 20 M8-L2 dwarfs

Extrasolar planet searches targeting very low-mass stars and brown dwarfs are hampered by intrinsic or instrumental limitations. Time series of astrometric measurements with precisions better than one milli-arcsecond can yield new evidence…

Solar and Stellar Astrophysics · Physics 2014-05-08 J. Sahlmann , P. F. Lazorenko , D. Segransan , E. L. Martin , M. Mayor , D. Queloz , S. Udry

Very Low Mass Stellar and Substellar Companions to Solar-Like Stars From MARVELS V: A Low Eccentricity Brown Dwarf from the Driest Part of the Desert, MARVELS-6b

We describe the discovery of a likely brown dwarf (BD) companion with a minimum mass of 31.7 +/- 2.0 M_Jup to GSC 03546-01452 from the MARVELS radial velocity survey, which we designate as MARVELS-6b. For reasonable priors, our analysis…

Earth and Planetary Astrophysics · Physics 2015-06-15 Nathan De Lee , Jian Ge , Justin R. Crepp , Jason Eastman , Massimiliano Esposito , Bruno Femenía , Scott W. Fleming , B. Scott Gaudi , Luan Ghezzi , Jonay I. González Hernández , Brian L. Lee , Keivan G. Stassun , John P. Wisniewski , W. Michael Wood-Vasey , Eric Agol , Carlos Allende Prieto , Rory Barnes , Dmitry Bizyaev , Phillip Cargile , Liang Chang , Luiz N. Da Costa , G. F. Porto De Mello , Leticia D. Ferreira , Bruce Gary , Leslie Hebb , Jon Holtzman , Jian Liu , Bo Ma , Claude E. Mack , Suvrath Mahadevan , Marcio A. G. Maia , Duy Cuong Nguyen , Audrey Oravetz , Daniel J. Oravetz , Martin Paegert , Kaike Pan , Joshua Pepper , Elena Malanushenko , Viktor Malanushenko , Rafael Rebolo , Basilio X. Santiago , Donald P. Schneider , Alaina C. Shelden Bradley , Xiaoke Wan , Ji Wang , Bo Zhao

OGLE-2019-BLG-0362Lb: A super-Jovian-mass planet around a low-mass star

We present the analysis of a planetary microlensing event OGLE-2019-BLG-0362 with a short-duration anomaly $(\sim 0.4\, \rm days)$ near the peak of the light curve, which is caused by the resonant caustic. The event has a severe degeneracy…

Earth and Planetary Astrophysics · Physics 2022-09-14 Sun-Ju Chung , Jennifer C. Yee , Andrej Udalski , Andrew Gould , Michael D. Albrow , Youn Kil Jung , Kyu-Ha Hwang , Cheongho Han , Yoon-Hyun Ryu , In-Gu Shin , Yossi Shvartzvald , Weicheng Zang , Sang-Mok Cha , Dong-Jin Kim , Seung-Lee Kim , Chung-Uk Lee , Dong-Joo Lee , Yongseok Lee , Byeong-Gon Park , Richard W. Pogge , Radek Poleski , Przemek Mróz Paweł Pietrukowicz , Jan Skowron , Michał K. Szymański , Igor Soszyński , Szymon Kozłowski , Krzysztof A. Rybicki , Patryk Iwanek , Marcin Wrona , Mariusz Gromadzki , Krzysztof Ulaczyk

Low-Mass Companions to Solar-Type Stars

We present preliminary results from a coronagraphic survey of young nearby Sun-like stars using the Palomar and Keck adaptive optics systems. We have targeted 251 solar analogs (F5-K5) at 20-160 pc from the Sun, spanning the 3-3000 Myr age…

Astrophysics · Physics 2015-06-10 Stanimir Metchev , Lynne Hillenbrand

An L0 dwarf companion in the brown dwarf desert, at 30 AU

We present the discovery of an L0 companion to the nearby M1.5 dwarf G 239-25, at a projected distance of 31 AU. It is the faintest companion discovered so far in our adaptive optics survey of all known M dwarfs within 12 pc, and it lies at…

Astrophysics · Physics 2009-11-10 T. Forveille , D. Ségransan , P. Delorme , E. L. Martín , X. Delfosse , J. A. Acosta-Pulido , J. -L. Beuzit , A. Manchado , M. Mayor , C. Perrier , S. Udry

Keck and Hubble Observations Show That MOA-2008-BLG-379Lb Is a Super-Jupiter Orbiting an M Dwarf

We present high angular resolution imaging that detects the MOA-2008-BLG-379L exoplanet host star using Keck adaptive optics and the Hubble Space Telescope. These observations reveal host star and planet masses of $M_{\rm…

Earth and Planetary Astrophysics · Physics 2024-05-08 David P. Bennett , Aparna Bhattacharya , Jean-Philippe Beaulieu , Naoki Koshimoto , Joshua W. Blackman , Ian A. Bond , Clement Ranc , Natalia Rektsini , Sean K. Terry , Aikaterini Vandorou , Jessica R. Lu , Jean Baptiste Marquette , Greg Olmschenk , Daisuke Suzuki

The Mass of the MACHO-LMC-5 Lens Star

We combine the available astrometric and photometric data for the 1993 microlensing event MACHO-LMC-5 to measure the mass of the lens, M=0.097 +/- 0.016 Msun. This is the most precise direct mass measurement of a single star other than the…

Astrophysics · Physics 2009-11-10 Andrew Gould , David P. Bennett , David R. Alves

GQ Lup B Visible & Near-Infrared Photometric Analysis

We have re-analyzed archival HST and Subaru data of the recently discovered planetary mass companion (PMC) GQ Lup B. With these we produce the first R and I band photometry of the companion and fit a radius and effective temperature using…

Astrophysics · Physics 2009-11-11 C. Marois , B. Macintosh , T. Barman

Discovery of the Coldest Imaged Companion of a Sun-Like Star

We present the discovery of a brown dwarf or possible planet at a projected separation of 1.9" = 29 AU around the star GJ 758, placing it between the separations at which substellar companions are expected to form by core accretion (~5 AU)…

Earth and Planetary Astrophysics · Physics 2014-11-20 Christian Thalmann , Joseph Carson , Markus Janson , Miwa Goto , Michael McElwain , Sebastian Egner , Markus Feldt , Jun Hashimoto , Yutaka Hayano , Thomas Henning , Klaus W. Hodapp , Ryo Kandori , Hubert Klahr , Tomoyuki Kudo , Nobuhiko Kusakabe , Christoph Mordasini , Jun-Ichi Morino , Hiroshi Suto , Ryuji Suzuki , Motohide Tamura

The VLT/NaCo large program to probe the occurrence of exoplanets and brown dwarfs at wide orbits: II- Survey description, results and performances

In anticipation of the VLT/SPHERE planet imager guaranteed time programs, we have conducted a preparatory survey of 86 stars between 2009 and 2013 in order to identify new faint comoving companions to ultimately carry out a comprehensive…

Earth and Planetary Astrophysics · Physics 2015-06-19 G. Chauvin , A. Vigan , M. Bonnefoy , S. Desidera , M. Bonavita , D. Mesa , A. Boccaletti , E. Buenzli , J. Carson , P. Delorme , J. Hagelberg , G. Montagnier , C. Mordasini , S. P. Quanz , D. Segransan , C. Thalmann , J. -L. Beuzit , B. Biller , E. Covino , M. Feldt , J. Girard , R. Gratton , T. Henning , M. Kasper , A. -M. Lagrange , S. Messina , M. Meyer , D. Mouillet , C. Moutou , M. Reggianni , J. E. Schlieder , A. Zurlo

A Super-Jupiter orbiting a late-type star: A refined analysis of microlensing event OGLE-2012-BLG-0406

We present a detailed analysis of survey and follow-up observations of microlensing event OGLE-2012-BLG-0406 based on data obtained from 10 different observatories. Intensive coverage of the lightcurve, especially the perturbation part,…

Earth and Planetary Astrophysics · Physics 2015-06-17 Y. Tsapras , J. -Y. Choi , R. A. Street , C. Han , V. Bozza , A. Gould , M. Dominik , J. -P. Beaulieu , A. Udalski , U. G. Jørgensen , T. Sumi , D. M. Bramich , P. Browne , K. Horne , M. Hundertmark , S. Ipatov , N. Kains , C. Snodgrass , I. A. Steele , K. A. Alsubai , J. M. Andersen , S. Calchi Novati , Y. Damerdji , C. Diehl , A. Elyiv , E. Giannini , S. Hardis , K. Harpsøe , T. C. Hinse , D. Juncher , E. Kerins , H. Korhonen , C. Liebig , L. Mancini , M. Mathiasen , M. T. Penny , M. Rabus , S. Rahvar , G. Scarpetta , J. Skottfelt , J. Southworth , J. Surdej , J. Tregloan-Reed , C. Vilela , J. Wambsganss , J. Skowron , R. Poleski , S. Kozłowski , Łukasz Wyrzykowski , M. K. Szymański , M. Kubiak , P. Pietrukowicz , G. Pietrzyński , I. Soszyński , K. Ulaczyk , M. D. Albrow , E. Bachelet , R. Barry , V. Batista , A. Bhattacharya , S. Brillant , J. A. R. Caldwell , A. Cassan , A. Cole , E. Corrales , Ch. Coutures , S. Dieters , D. Dominis Prester , J. Donatowicz , P. Fouqué , J. Greenhill , S. R. Kane , D. Kubas , J. -B. Marquette , J. Menzies , C. P`ere , K. R. Pollard , D. Wouters , G. Christie , D. L. DePoy , S. Dong , J. Drummond , B. S. Gaudi , C. B. Henderson , K. H. Hwang , Y. K. Jung , A. Kavka , J. -R. Koo , C. -U. Lee , D. Maoz , L. A. G. Monard , T. Natusch , H. Ngan , H. Park , R. W. Pogge , I. Porritt , I. -G. Shin , Y. Shvartzvald , T. G. Tan , J. C. Yee , F. Abe , D. P. Bennett , I. A. Bond , C. S. Botzler , M. Freeman , A. Fukui , D. Fukunaga , Y. Itow , N. Koshimoto , C. H. Ling , K. Masuda , Y. Matsubara , Y. Muraki , S. Namba , K. Ohnishi , N. J. Rattenbury , To. Saito , D. J. Sullivan , W. L. Sweatman , D. Suzuki , P. J. Tristram , N. Tsurumi , K. Wada , N. Yamai , P. C. M. Yock A. Yonehara

Gaia22dkvLb: A Microlensing Planet Potentially Accessible to Radial-Velocity Characterization

We report discovering an exoplanet from following up a microlensing event alerted by Gaia. The event Gaia22dkv is toward a disk source rather than the traditional bulge microlensing fields. Our primary analysis yields a Jovian planet with…

Earth and Planetary Astrophysics · Physics 2024-05-31 Zexuan Wu , Subo Dong , Tuan Yi , Zhuokai Liu , Kareem El-Badry , Andrew Gould , L. Wyrzykowski , K. A. Rybicki , Etienne Bachelet , Grant W. Christie , L. de Almeida , L. A. G. Monard , J. McCormick , Tim Natusch , P. Zielinski , Huiling Chen , Yang Huang , Chang Liu , A. Merand , Przemek Mroz , Jinyi Shangguan , Andrzej Udalski , J. Woillez , Huawei Zhang , Franz-Josef Hambsch , P. J. Mikolajczyk , M. Gromadzki , M. Ratajczak , Katarzyna Kruszynska , N. Ihanec , Uliana Pylypenko , M. Sitek , K. Howil , Staszek Zola , Olga Michniewicz , Michal Zejmo , Fraser Lewis , Mateusz Bronikowski , Stephen Potter , Jan Andrzejewski , Jaroslav Merc , Rachel Street , Akihiko Fukui , R. Figuera Jaimes , V. Bozza , P. Rota , A. Cassan , M. Dominik , Y. Tsapras , M. Hundertmark , J. Wambsganss , K. Bakowska , A. Slowikowska

New Method to Measure Proper Motions of Microlensed Sources: Application to Candidate Free-Floating-Planet Event MOA-2011-BLG-262

We develop a new method to measure source proper motions in microlensing events, which can partially overcome problems due to blending. It takes advantage of the fact that the source position is known precisely from the microlensing event…

Earth and Planetary Astrophysics · Physics 2015-06-18 Jan Skowron , Andrzej Udalski , Michał K Szymański , Marcin Kubiak , Grzegorz Pietrzyński , Igor Soszyński , Radosław Poleski , Krzysztof Ulaczyk , Paweł Pietrukowicz , Szymon Kozłowski , Łukasz Wyrzykowski , Andrew Gould

OGLE-2014-BLG-0221Lb: A Jupiter Mass Ratio Companion Orbiting either a Late-Type Star or a Stellar Remnant

We present the analysis of microlensing event OGLE-2014-BLG-0221, a planetary candidate event discovered in 2014. The photometric light curve is best described by a binary-lens single-source model. Our light curve modeling finds two…

Earth and Planetary Astrophysics · Physics 2023-10-23 Rintaro Kirikawa , Takahiro Sumi , David P. Bennett , Daisuke Suzuki , Naoki Koshimoto , Shota Miyazaki , Ian A. Bond , Andrzej Udalski , Nicholas J. Rattenbury , Fumio Abe , Richard Barry , Aparna Bhattacharya , Hirosane Fujii , Akihiko Fukui , Ryusei Hamada , Yuki Hirao , Stela Ishitani Silva , Yoshitaka Itow , Yutaka Matsubara , Yasushi Muraki , Greg Olmschenk , Clément Ranc , Yuki K. Satoh , Mio Tomoyoshi , Paul . J. Tristram , Aikaterini Vandorou , Hibiki Yama , Kansuke Yamashita , Przemek Mróz , Radosław Poleski , Jan Skowron , Michał K. Szymański , Igor Soszyński , Paweł Pietrukowicz , Szymon Kozłowski , Krzysztof Ulaczyk

OGLE-2015-BLG-1670Lb: A Cold Neptune beyond the Snow Line in the Provisional WFIRST Microlensing Survey Field

We present the analysis of the microlensing event OGLE-2015-BLG-1670, detected in a high-extinction field, very close to the Galactic plane. Due to the dust extinction along the line of sight, this event was too faint to be detected before…

Earth and Planetary Astrophysics · Physics 2019-06-26 Clément Ranc , David P. Bennett , Yuki Hirao , Andrzej Udalski , Cheongho Han , Ian A. Bond , Jennifer C. Yee , The KMTNet Collaboration , : , Michael D. Albrow , Sun-Ju Chung , Andrew Gould , Kyu-Ha Hwang , Youn-Kil Jung , Yoon-Hyun Ryu , In-Gu Shin , Yossi Shvartzvald , Weicheng Zang , Wei Zhu , Sang-Mok Cha , Dong-Jin Kim , Hyoun-Woo Kim , Seung-Lee Kim , Chung-Uk Lee , Dong-Joo Lee , Yong-Seok Lee , Byeong-Gon Park , Richard W. Pogge , The MOA Collaboration , : , Fumio Abe , Richard K. Barry , Aparna Bhattacharya , Martin Donachie , Akihiko Fukui , Yoshitaka Itow , Kohei Kawasaki , Iona Kondo , Naoki Koshimoto , Man Cheung Alex Li , Yutaka Matsubara , Shota Miyazaki , Yasushi Muraki , Masayuki Nagakane , Nicholas J. Rattenbury , Haruno Suematsu , Denis J. Sullivan , Takahiro Sumi , Daisuke Suzuki , Paul J. Tristram , Atsunori Yonehara , The OGLE Collaboration , : , Radosław Poleski , Przemek Mróz , Jan Skowron , Michał K. Szymański , Igor Soszyński , Szymon Kozłowski , Paweł Pietrukowicz , Krzysztof Ulaczyk

Ogle-2018-blg-0677lb: A super earth near the galactic bulge

We report the analysis of the microlensing event OGLE-2018-BLG-0677. A small feature in the light curve of the event leads to the discovery that the lens is a star-planet system. Although there are two degenerate solutions that could not be…

Earth and Planetary Astrophysics · Physics 2020-05-11 Antonio Herrera-Martín , M. D. Albrow , A. Udalski , A. Gould , Y. -H. Ryu , J. C. Yee , S. -J. Chung , C. Han , K. -H. Hwang , Y. K. Jung , C. -U. Lee , I. -G. Shin , Y. Shvartzvald , W. Zang , S. -M. Cha , D. -J. Kim , H. -W. Kim , S. -L. Kim , D. -J. Lee , Y. Lee , B. -G. Park , R. W. Pogge , M. K. Szymański , P. Mróz , J. Skowron , R. Poleski , I. Soszyński , S. Kozłowski , P. Pietrukowicz , K. Ulaczyk , K. Rybicki , P. Iwanek , M. Wrona

Microlensing Discovery of a Population of Very Tight, Very Low-mass Binary Brown Dwarfs

Although many models have been proposed, the physical mechanisms responsible for the formation of low-mass brown dwarfs are poorly understood. The multiplicity properties and minimum mass of the brown-dwarf mass function provide critical…

Solar and Stellar Astrophysics · Physics 2015-06-15 J. -Y. Choi , C. Han , A. Udalski , T. Sumi , B. S. Gaudi , A. Gould , D. P. Bennett , M. Dominik , J. -P. Beaulieu , Y. Tsapras , V. Bozza , F. Abe , I. A. Bond , C. S. Botzler , P. Chote , M. Freeman , A. Fukui , K. Furusawa , Y. Itow , C. H. Ling , K. Masuda , Y. Matsubara , N. Miyake , Y. Muraki , K. Ohnishi , N. J. Rattenbury , To. Saito , D. J. Sullivan , K. Suzuki , W. L. Sweatman , D. Suzuki , S. Takino , P. J. Tristram , K. Wada , P. C. M. Yock , M. K. Szymański , M. Kubiak , G. Pietrzyński , I. Soszyński , J. Skowron , S. Kozłowski , R. Poleski , K. Ulaczyk , Ł. Wyrzykowski , P. Pietrukowicz , L. A. Almeida , D. L. DePoy , Subo Dong , E. Gorbikov , F. Jablonski , C. B. Henderson , K. -H. Hwang , J. Janczak , Y. -K. Jung , S. Kaspi , C. -U. Lee , U. Malamud , D. Maoz , D. McGregor , J. A. Munoz , B. -G. Park , H. Park , R. W. Pogge , Y. Shvartzvald , I. -G. Shin , J. C. Yee , K. A. Alsubai , P. Browne , M. J. Burgdorf , S. Calchi Novati , P. Dodds , X. -S. Fang , F. Finet , M. Glitrup , F. Grundahl , S. -H. Gu , S. Hardis , K. Harpsøe , T. C. Hinse , A. Hornstrup , M. Hundertmark , J. Jessen-Hansen , U. G. Jørgensen , N. Kains , E. Kerins , C. Liebig , M. N. Lund , M. Lundkvist , G. Maier , L. Mancini , M. Mathiasen , M. T. Penny , S. Rahvar , D. Ricci , G. Scarpetta , J. Skottfelt , C. Snodgrass , J. Southworth , J. Surdej , J. Tregloan-Reed , J. Wambsganss , O. Wertz , F. Zimmer , M. D. Albrow , E. Bachelet , V. Batista , S. Brillant , A. Cassan , A. A. Cole , C. Coutures , S. Dieters , D. Dominis Prester , J. Donatowicz , P. Fouqué , J. Greenhill , D. Kubas , J. -B. Marquette , J. W. Menzies , K. C. Sahu , M. Zub , D. M. Bramich , K. Horne , I. A. Steele , R. A. Street

Four binary microlenses with directly measured masses

We investigated binary lens events from the 2022-2024 microlensing surveys, aiming to identify events suitable for lens mass measurements. We focused on two key light curve features: distinct caustic spikes with resolved crossings for…

Instrumentation and Methods for Astrophysics · Physics 2025-08-18 Cheongho Han , Andrzej Udalski , Chung-Uk Lee , Ian A. Bond , 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 , Sang-Mok Cha , Doeon Kim , Dong-Jin Kim , Seung-Lee Kim , Dong-Joo Lee , Yongseok Lee , Byeong-Gon Park , Richard W. Pogge , 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 , Michał Jaroszyński , Marcin Kiraga , Fumio Abe , David P. Bennett , Aparna Bhattacharya , Akihiko Fukui , Ryusei Hamada , Stela Ishitani Silva , Yuki Hirao , Naoki Koshimoto , Yutaka Matsubara , Shota Miyazaki , Yasushi Muraki , Tutumi Nagai , Kansuke Nunota , Greg Olmschenk , Clément Ranc , Nicholas J. Rattenbury , Yuki Satoh , Takahiro Sumi , Daisuke Suzuki , Sean K. Terry , Paul J. Tristram , Aikaterini Vandorou , Hibiki Yama

The Solar Neighborhood. XXXIV. A Search for Planets Orbiting Nearby M Dwarfs using Astrometry

Astrometric measurements are presented for seven nearby stars with previously detected planets: six M dwarfs (GJ 317, GJ 667C, GJ 581, GJ 849, GJ 876, and GJ 1214) and one K dwarf (BD $-$10 3166). Measurements are also presented for six…

Solar and Stellar Astrophysics · Physics 2015-06-22 John C. Lurie , Todd J. Henry , Wei-Chun Jao , Samuel N. Quinn , Jennifer G. Winters , Philip A. Ianna , David W. Koerner , Adric R. Riedel , John P. Subasavage

A Keck LGS AO Search for Brown Dwarf and Planetary Mass Companions to Upper Scorpius Brown Dwarfs

We searched for binary companions to 20 young brown dwarfs in the Upper Scorpius association (145 pc, 5 Myr, nearest OB association) with the the Laser Guide Star adaptive optics system and the facility infrared camera NIRC2 on the 10 m…

Solar and Stellar Astrophysics · Physics 2015-05-27 Beth Biller , Katelyn Allers , Michael Liu , Laird Close , Trent Dupuy