Results 21 to 30 of about 1,852 (121)

Exoplanet Detection Techniques [PDF]

, 2014
We are still in the early days of exoplanet discovery. Astronomers are beginning to model the atmospheres and interiors of exoplanets and have developed a deeper understanding of processes of planet formation and evolution.
Fischer, Debra A., Howard, Andrew W., Laughlin, Greg P., Macintosh, Bruce, Mahadevan, Suvrath, Sahlmann, Johannes, Yee, Jennifer C.   +6 more
core   +3 more sources

Microlensing path parametrization for Earth-like Exoplanet detection around solar mass stars

, 2018
We propose a new parametrization of the impact parameter u0 and impact angle {\alpha} for microlensing systems composed by an Earth-like Exoplanet around a Solar mass Star at 1 AU.
de Almeida, L., Nascimento Jr, J. -D. do
core   +2 more sources

OGLE-2016-BLG-1195 AO: Lens, Companion to Lens or Source, or None of the Above?

The Astronomical Journal, 2023
We systematically investigate Vandorou et al.’s claim to have detected the host star of the low-mass-ratio ( q < 10 ^−4 ) microlensing planet OGLE-2016-BLG-1195Lb, via Keck adaptive optics (AO) measurements Δ t = 4.12 yr after the event’s peak ( t _0 ...
Andrew Gould, Yossi Shvartzvald, Jiyuan Zhang, Jennifer C. Yee, Sebastiano Calchi Novati, Weicheng Zang, Eran O. Ofek   +6 more
doaj   +1 more source

Wavelet Transforms of Microlensing Data: Denoising, Extracting Intrinsic Pulsations, and Planetary Signals

The Astronomical Journal, 2023
Wavelets are waveform functions that describe transient and unstable variations, such as noise. In this work, we study the advantages of discrete and continuous wavelet transforms (DWTs and CWTs) of microlensing data to denoise them and extract their ...
Sedighe Sajadian, Hossein Fatheddin
doaj   +1 more source

GravityCam: higher resolution visible wide-field imaging [PDF]

, 2018
The limits to the angular resolution has, during the latest 70 years, been obtainable from the ground only through extremely expensive adaptive optics facilities at large telescopes, and covering extremely small spatial areas per exposure.
Downing, Downing, Einstein, Ivezic, Jorden, Reid, Segovia, Stefanov   +7 more
core   +1 more source

Terrestrial- and Neptune-mass Free-Floating Planet Candidates from the MOA-II 9 yr Galactic Bulge Survey

The Astronomical Journal, 2023
We report the discoveries of low-mass free-floating planet (FFP) candidates from the analysis of 2006–2014 MOA-II Galactic bulge survey data. In this data set, we found 6111 microlensing candidates and identified a statistical sample consisting of 3535 ...
Naoki Koshimoto, Takahiro Sumi, David P. Bennett, Valerio Bozza, Przemek Mróz, Andrzej Udalski, Nicholas J. Rattenbury, Fumio Abe, Richard Barry, Aparna Bhattacharya, Ian A. Bond, Hirosane Fujii, Akihiko Fukui, Ryusei Hamada, Yuki Hirao, Stela Ishitani Silva, Yoshitaka Itow, Rintaro Kirikawa, Iona Kondo, Yutaka Matsubara, Shota Miyazaki, Yasushi Muraki, Greg Olmschenk, Clément Ranc, Yuki Satoh, Daisuke Suzuki, Mio Tomoyoshi, Paul J. Tristram, Aikaterini Vandorou, Hibiki Yama, Kansuke Yamashita, MOA Collaboration   +31 more
doaj   +1 more source

Ongoing astrometric microlensing events from VVV and Gaia [PDF]

, 2019
6 pages, 2 figures, accepted MNRAS LettersWe extend predictive microlensing event searches using the Vista Variables in the Via Lactea survey and the second Gaia data release.
Belokurov, Vasily, Evans, N. Wyn, Lucas, Philip W., McGill, Peter, Smith, Leigh C.   +4 more
core   +3 more sources

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   +1 more source

Toward Measuring the Microlensing Event Rate in the Galactic Center. I. Event Detection from the UKIRT Microlensing Survey Data

The Astrophysical Journal Supplement Series, 2023
To overcome the high optical extinction, near-infrared (NIR) observations are needed for probing the microlensing events toward the Galactic center. The 2015–2019 UKIRT microlensing survey toward the Galactic center is the first dedicated precursor NIR ...
Yongxin Wen, Weicheng Zang, Bo Ma
doaj   +1 more source

Detection of Extrasolar Planets by Gravitational Microlensing

, 2008
Gravitational microlensing provides a unique window on the properties and prevalence of extrasolar planetary systems because of its ability to find low-mass planets at separations of a few AU.
A. Alcock, A. D. Bolatto, A. Gould, A. Gould, A. Gould, A. Gould, A. Gould, A. Gould, A. P. Boss, A. Udalski, A. Udalski, A. Udalski, A. Wolszczan, B. Paczyński, B. S. Gaudi, B. S. Gaudi, B. S. Gaudi, B. S. Gaudi, B. S. Gaudi, C. Alcock, C. Alcock, C. Alcock, C. Alcock, C. Alcock, C. Hamadache, C. Han, D. P. Bennett, D. P. Bennett, D. P. Bennett, D. P. Bennett, D. P. Bennett, D. P. Bennett, D. P. Bennett, D. P. Bennett, D. P. Bennett, D. S. Graff, D.P. Bennett, F. Abe, F. Delplancke, G. Basri, G. F. Lewis, G. Laughlin, G. M. Kennedy, G. T. Belle van, I. A. Bond, I. A. Bond, I.A. Bond, I.A. Bond, J. An, J. Yoo, J.-P. Beaulieu, K. C. Sahu, K. Chang, K. Chang, K. Griest, M. Albrow, M. C. Smith, M. C. Smith, M. D. Albrow, M. D. Albrow, M. D. Albrow, M. Dominik, M. Dominik, M. Jaroszynski, M. S. Bessell, P. Kervella, P. Popowski, P. Schneider, P. Schneider, P. Tisserand, R. P. Butler, R. R. Bourassa, S. Benetti, S. Dong, S. Dong, S. H. Rhie, S. H. Rhie, S. H. Rhie, S. H. Rhie, S. Ida, S. J. Peale, S. Liebes, S. Mao, S. Mao, S. Mao, S. Poindexter, S. Refsdal, S. Refsdal, S. Udry, T. R. Lauer, T. Sumi, T. Sumi, T. Yanagisawa, X. Wu   +93 more
core   +1 more source