Results 91 to 100 of about 11,137 (251)

Casting Light on Degeneracies: A Comprehensive Study of Lightcurve Variations in Microlensing Events OGLE-2017-BLG-0103 and OGLE-2017-BLG-0192

The Astronomical Journal
This study investigates orbital parallax in gravitational microlensing events, focusing on OGLE-2017-BLG-0103 and OGLE-2017-BLG-0192. For events with timescales ≤60 days, a Jerk-Parallax degeneracy arises due to high Jerk velocity ( $\tilde{{v}_{j ...
Sarang Shah
doaj   +1 more source

Microlensing planets in M22: free-floating or bound?

, 2001
We use detailed numerical simulations and theoretical estimates to show that, if confirmed, the unusually brief microlensing events observed by Sahu et al.
Adams, Alcock, Bonnell, Boss, C. de la Fuente Marcos, , Cote, Davidge, de la Fuente Marcos, de la Fuente Marcos, de la Fuente Marcos, de la Fuente Marcos, Eggleton, Gaudi, Jetzer, Kerins, Laughlin, Laughlin, Lucas, Mao, Metcalf, Moore, Paczynski, R. de la Fuente Marcos, , Scalo, Smith, Sánchez-Salcedo, Sánchez-Salcedo, Witt, Zapatero Osorio   +28 more
core   +1 more source

The new frontiers of gravitational microlensing [PDF]

, 2022
M. Dominik
openalex   +1 more source

How Rare Are TESS Free-floating Planets?

The Astrophysical Journal Letters
Recently, Kunimoto et al. claimed that a short-lived signal in the Transiting Exoplanet Survey Satellite (TESS) Sector 61 database was possibly caused by a microlensing event with a terrestrial-mass free-floating planet (FFP) lens.
Hongjing Yang, Weicheng Zang, Tianjun Gan, Renkun Kuang, Andrew Gould, Shude Mao   +5 more
doaj   +1 more source

Gravitational microlensing in Verlinde's emergent gravity

Physics Letters B, 2017
We propose gravitational microlensing as a way of testing the emergent gravity theory recently proposed by Eric Verlinde [1]. We consider two limiting cases: the dark mass of maximally anisotropic pressures (Case I) and of isotropic pressures (Case II ...
Lei-Hua Liu, Tomislav Prokopec
doaj   +1 more source

New VR magnification ratios of QSO 0957+561

, 2004
We present VR magnification ratios of QSO 0957+561, which are inferred from the GLITP light curves of Q0957+561A and new frames taken with the 2.56m Nordic Optical Telescope about 14 months after the GLITP monitoring.
A. Oscoz, A. Ullan, E. Mediavilla, Garrett M. A., J. A. Munoz, J. Gonzalez‐Cadelo, L. J. Goicoechea, M. Serra‐Ricart, Pelt J., R. Gil‐Merino, Refsdal S., Schmidt R., Wambsganss J.   +12 more
core   +1 more source

Parallax Effect in Microlensing Events Due to Free-floating Planets

The Astronomical Journal
One of the most important applications of microlensing observations is the detection of free-floating planets (FFPs). The timescale of microlensing due to FFPs ( t _E ) is short (a few days). Discerning the annual parallax effect in observations of these
Parisa Sangtarash, Sedighe Sajadian
doaj   +1 more source

Finite-Size Gravitational Microlenses

The Astrophysical Journal, 1996
The finite size of a gravitational microlens may have an effect on the observed amplification of a background point source. The mechanism is occlusion of one or more of the source images by the opaque bulk material of the lens as it travels in front of the source.
openaire   +1 more source

On Finding Black Holes in Photometric Microlensing Surveys

The Astrophysical Journal
There are expected to be millions of isolated black holes in the galaxy resulting from the deaths of massive stars. Measuring the abundance and properties of this remnant population would shed light on the end stages of stellar evolution and the ...
Zofia Kaczmarek, Peter McGill, Scott E. Perkins, William A. Dawson, Macy Huston, Ming-Feng Ho, Natasha S. Abrams, Jessica R. Lu   +7 more
doaj   +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