Results 41 to 50 of about 15,525 (87)

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

The Astronomical Journal
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.
David P. Bennett, Aparna Bhattacharya, Jean-Philippe Beaulieu, Naoki Koshimoto, Joshua W. Blackman, Ian A. Bond, Clément Ranc, Natalia Rektsini, Sean K. Terry, Aikaterini Vandorou, Jessica R. Lu, Jean Baptiste Marquette, Greg Olmschenk, Daisuke Suzuki   +13 more
doaj   +1 more source

Detection and Characterization of Microlensing Events Due to Isolated Black Holes toward the Magellanic Clouds in the Rubin Observations

The Astrophysical Journal
Gravitational microlensing surveys potentially discover isolated black holes (IBHs) at large distances through their gravitational effects on the apparent brightness and motion of collinear stars.
Sedighe Sajadian, Martín Makler
doaj   +1 more source

KMT-2024-BLG-3237: Another Free-floating Planet Candidate with Angular Einstein Radius Measurement

The Astronomical Journal
Planet-formation theories suggest the presence of free-floating planets (FFPs) that are ejected from their formation sites. While these planets emit very little light, they can be identified through gravitational microlensing.
Tanagodchaporn Inyanya, Youn Kil Jung, Hongjing Yang, Kyu-Ha Hwang, Andrew Gould, Michael D. Albrow, Sun-Ju Chung, Cheongho Han, Yoon-Hyun Ryu, In-Gu Shin, Yossi Shvartzvald, Jennifer C. Yee, Weicheng Zang, Dong-Jin Kim, Chung-Uk Lee, Byeong-Gon Park   +15 more
doaj   +1 more source

Measurement of the Free-Floating Planet Mass Function with Simultaneous Euclid and WFIRST Microlensing Parallax Observations [PDF]

, 2019
Free-floating planets are the remnants of violent dynamical rearrangements of planetary systems. It is possible that even our own solar system ejected a large planet early in its evolution.
Beaulieu, Jean-Phillipe, Novati, Sebastiano Calchi, Johnson, Samson, Bachelet, Etienne, Mao, Shude, Henderson, Calen B., Bennett, David, Ranc, Clément, Kerins, Eamonn, Penny, Matthew T., Hendederson, Calen B., Akeson, Rachel, Bozza, Valerio, Gaudi, B. Scott, Poleski, Radek, Street, Rachel, Penny, Matthew, Kerins, Eamonn; id_orcid, Shvartzvald, Yossi, Sahu, Kailash C., Bhattacharya, Aparna, Rhodes, Jason, Beichman, Charles, Calchi Novati, Sebastiano   +23 more
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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
doaj   +1 more source

First Resolution of Microlensed Images of a Binary-lens Event

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
doaj   +1 more source

Disentangling the Black Hole Mass Spectrum with Photometric Microlensing Surveys

The Astrophysical Journal
From the formation mechanisms of stars and compact objects to nuclear physics, modern astronomy frequently leverages surveys to understand populations of objects to answer fundamental questions.
Scott E. Perkins, Peter McGill, William Dawson, Natasha S. Abrams, Casey Y. Lam, Ming-Feng Ho, Jessica R. Lu, Simeon Bird, Kerianne Pruett, Nathan Golovich, George Chapline   +10 more
doaj   +1 more source

OGLE-2016-BLG-1195Lb: A Sub-Neptune Beyond the Snow Line of an M-dwarf Confirmed by Keck Adaptive Optics

The Astronomical Journal
We present the analysis of high-resolution follow-up observations of OGLE-2016-BLG-1195 using Laser Guide Star Adaptive Optics with Keck, seven years after the event’s peak.
Aikaterini Vandorou, Lisa Dang, David P. Bennett, Naoki Koshimoto, Sean K. Terry, Andrzej Udalski, Jean-Philippe Beaulieu, Christophe Alard, Aparna Bhattacharya, Joshua W. Blackman, Ian A. Bond, Tarik Bouchoutrouch-Ku, Andrew A. Cole, Nicolas B. Cowan, Jean-Baptiste Marquette, Clément Ranc, Natalia E. Rektsini, Sylvain Cetre, Jim Lyke, Eduardo Marin, Peter Wizinowich   +20 more
doaj   +1 more source

Microlensing Constraints on Primordial Black Holes toward the Bulge Are Galactic Model Limited

The Astrophysical Journal
Postulated to form from density fluctuations in the early Universe, primordial black holes (PBHs) could constitute some fraction of dark matter (DM).
Scott E. Perkins, Peter McGill, William A. Dawson, Ming-Feng Ho, Natasha S. Abrams, Simeon Bird, Jessica R. Lu   +6 more
doaj   +1 more source

Parallax effects on microlensing events caused by free-floating planets

, 2013
Free-floating planets are recently drawing a special interest among the scientific community. Gravitational microlensing is up to now the exclusive method for the study of this Galactic population.
L. Hamolli, M. Hafizi, DE PAOLIS, Francesco, NUCITA, Achille   +3 more
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