Results 91 to 100 of about 10,420 (207)

The first direct detection of a gravitational micro-lens toward the Galactic bulge

, 2007
We present a direct detection of the gravitational lens that caused the microlensing event MACHO-95-BLG-37. This is the first fully resolved microlensing system involving a source in the Galactic bulge, and the second such system in general. The lens and
A. Wood, Baraffe I., Bessell M. S., Chang K., Kozlowski S., P. R. Woźniak, Perryman M. A. C., S. Kozłowski, S. Mao, Udalski A., Wozniak P.   +10 more
core   +1 more source

The gravitational mass of Proxima Centauri measured with SPHERE from a microlensing event

, 2018
Proxima Centauri, our closest stellar neighbour, is a low-mass M5 dwarf orbiting in a triple system. An Earth-mass planet with an 11 day period has been discovered around this star.
Almenara, J. -M., Avenhaus, H., Desidera, S., Enia, A., Girard, J., Giro, E., Gluck, L., Gratton, R., Janson, M., Kervella, P., Lagadec, E., Langlois, M., Mesa, D., Milli, J., Perrot, C., Ramos, J., Roux, A., Sahu, K., Schlieder, J. -E., Thalmann, C., Vigan, A., Zurlo, A.   +21 more
core   +1 more source

Finding Planets via Gravitational Microlensing

This preprint will be published in: Handbook of Exoplanets 2nd edition, edited by Hans Deeg and Juan Antonio Belmonte, Springer Nature Switzerland AG, reproduced with permission of Springer Nature Switzerland ...
Rektsini, Natalia E., Batista, Virginie
openaire   +2 more sources

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

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

EUCLID : Dark Universe Probe and Microlensing planet Hunter

, 2010
There is a remarkable synergy between requirements for Dark Energy probes by cosmic shear measurements and planet hunting by microlensing. Employing weak and strong gravitational lensing to trace and detect the distribution of matter on cosmic and ...
Batista, V, Beaulieu, J P, Bennett, D P, Cassan, A, Dong, S, Fouqué, P, Gaudi, B S, Gelino, Dawn M, Gould, A, Kerins, Eamonn, Kerrins, E, Kubas, D, Mao, S, Miralda-Escudé, J, Ribas, Ignasi, Wambsganss, J   +15 more
core  

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

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