Results 21 to 30 of about 111 (85)

Dark Matter Halos from the Inside Out

Advances in Astronomy, Volume 2011, Issue 1, 2011., 2011
The balance of evidence indicates that individual galaxies and groups or clusters of galaxies are embedded in enormous distributions of cold, weakly interacting dark matter. These dark matter “halos” provide the scaffolding for all luminous structures in the universe, and their properties comprise an essential part of the current cosmological model.
James E. Taylor, Rob Ivison
wiley   +1 more source

Automated Detection of Short Optical Transients of Astrophysical Origin in Real Time

Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010
The detection of short optical transients of astrophysical origin in real time is an important task for existing robotic telescopes. The faster a new optical transient is detected, the earlier follow‐up observations can be started. The sooner the object is identified, the more data can be collected before the source fades away, particularly in the most
Marcin Sokołowski, Katarzyna Małek, Lech W. Piotrowski, Grzegorz Wrochna, Taro Kotani   +4 more
wiley   +1 more source

microJAX: A Differentiable Framework for Microlensing Modeling with GPU-accelerated Image-centered Ray Shooting

The Astrophysical Journal
We introduce microJAX , the first fully differentiable implementation of the image-centered ray shooting algorithm for gravitational microlensing. Built on JAX and its XLA just-in-time compiler, microJAX exploits GPU parallelism while providing exact ...
Shota Miyazaki, Hajime Kawahara
doaj   +1 more source

Predictions of the Nancy Grace Roman Space Telescope Galactic Exoplanet Survey

Astronomy & Astrophysics
Context. The Nancy Grace Roman Space Telescope will expand the reach of gravitational microlensing surveys by increasing the number of events monitored and the precision of their light curves. Aims.
Saggese Vito, Bachelet Étienne, Calchi Novati Sebastiano, Bozza Valerio, Covone Giovanni, Zohrabi Farzaneh, Albrow Michael D., Anderson Jay, Beichman Charles, Bennett David P., Bhattacharya Aparna, Brandon Christopher, Carey Sean, Christiansen Jessie, Crisp Alison, DeRocco William, Scott Gaudi B., Hulberg Jon, Huston Macy J., Ishitani Silva Stela, Kerins Eamonn, Khakpash Somayeh, Kruszyńska Katarzyna, Lam Casey, Lu Jessica R., Malpas Amber, Murlidhar Arjun, Newman Marz, Olmschenk Greg, Penny Matthew, Stassun Keivan G., Stephan Alexander P., Street Rachel A., Sumi Takahiro, Terry Sean K., Verma Himanshu, Zang Weicheng   +36 more
doaj   +1 more source

Testing General Relativity with Binary Lens Microlensing Events

The Astrophysical Journal Letters
Einstein’s General Relativity (GR), which has been precisely tested on galaxy and solar system scales, is still poorly constrained in extremely weak gravitational fields (with dimensionless Newtonian potentials of Φ ∼ 10 ^−8 ). In this Letter, we propose
Xinyang Jin, Shuo Cao, Xuanni Chen, Yalong Nan, Xuchen Tai, Shuxun Tian   +5 more
doaj   +1 more source

MOA-2010-BLG-328: Keck and HST Expose the Limits of Occams Razor in Microlensing

The Astronomical Journal
We present high-resolution follow-up data of the microlensing event MOA-2010-BLG-328, using Keck and the Hubble Space Telescope. Keck data, taken 8 yr after the event, reveal a strong lens detection enabling measurement of lens flux and source-lens ...
Aikaterini Vandorou, David P. Bennett, Jean-Philippe Beaulieu, Aparna Bhattacharya, Joshua W. Blackman, Ian A. Bond, Andrew A. Cole, Naoki Koshimoto, Clément Ranc, Natalia E. Rektsini, Sean K. Terry   +10 more
doaj   +1 more source

Ambiguities in fits of binary lens galactic microlensing events

, 1997
36 pages in LaTeX2e format including 30 PostScript figures, final version accepted for publication in A& ...
openaire   +2 more sources

Rate of Caustic-crossing Microlensing Events in Stellar Binary Lenses with Significant Orbital Motion

The Astrophysical Journal
Binary lens microlensing events in which the source crosses a caustic produce sharp, distinctive magnification peaks and can therefore be readily identified.
Arjun Murlidhar, B. Scott Gaudi, Todd. A. Thompson   +2 more
doaj   +1 more source

A Newly Identified Degeneracy Keeps the Planetary Interpretation Viable for OGLE-2011-BLG-0950

The Astronomical Journal
The microlensing event OGLE-2011-BLG-0950 exhibits the well-known “Planet/Binary” degeneracy, in which distinct lens configurations produce similar light curves but imply substantially different mass ratios between the lens components.
Jiyuan Zhang, Weicheng Zang, Andrzej Udalski, Hongjing Yang, Shude Mao, Michał K. Szymański, Igor Soszyński, Radoslaw Poleski, Krzysztof Ulaczyk, Paweł Pietrukowicz, Szymon Kozłowski, Jan Skowron, Przemek Mróz, Sean Terry, Andrew Gould   +14 more
doaj   +1 more source

TESS’s First Bound Microlensing Planet—A Binary Microlensing Event Revealing a Planetary Companion toward the Galactic Plane

The Astrophysical Journal Letters
We report the discovery of Gaia23bra b, the first gravitationally bound microlensing planet detected by the Transiting Exoplanet Survey Satellite (TESS).
Mallory Harris, Diana Dragomir, Etienne Bachelet, Michael Fausnaugh, Samson Johnson   +4 more
doaj   +1 more source