scholarly journals A POSSIBLE BINARY SYSTEM OF A STELLAR REMNANT IN THE HIGH-MAGNIFICATION GRAVITATIONAL MICROLENSING EVENT OGLE-2007-BLG-514

2012 ◽  
Vol 752 (2) ◽  
pp. 82 ◽  
Author(s):  
N. Miyake ◽  
A. Udalski ◽  
T. Sumi ◽  
D. P. Bennett ◽  
S. Dong ◽  
...  
Keyword(s):  
Binary System ◽  
High Magnification ◽  
Gravitational Microlensing

scholarly journals Extrasolar planet detections with gravitational microlensing

2007 ◽  
Vol 3 (S249) ◽  
pp. 25-30
Author(s):  
Shude Mao ◽  
Eamonn Kerins ◽  
Nicholas J. Rattenbury
Keyword(s):  
Light Curve ◽  
Real Time ◽  
Extrasolar Planets ◽  
Light Curves ◽  
Extrasolar Planet ◽  
Galactic Centre ◽  
Wide Field ◽  
High Magnification ◽  
Gravitational Microlensing

AbstractMicrolensing light curves due to single stars are symmetric and typically last for a month. So far about 4000 microlensing events have been discovered in real-time, the vast majority toward the Galactic centre. The presence of planets around the primary lenses induces deviations in the usual light curve which lasts from hours (for an Earth-mass [M⊕] planet) to days (for a Jupiter-mass [Mj] planet). Currently the survey teams, OGLE and MOA, discover and announce microlensing events in real-time, and follow-up teams (together with the survey teams) monitor selected events intensively (usually with high magnification) in order to identify anomalies caused by planets. So far four extrasolar planets have been discovered using the microlensing technique, with half a dozen new planet candidates identified in 2007 (yet to be published). Future possibilities include a network of wide-field 2m-class telescopes from the ground (which can combine survey and follow-up in the same setup) and a 1m-class survey telescope from space.

scholarly journals Study by MOA of extrasolar planets in gravitational microlensing events of high magnification

2002 ◽  
Vol 333 (1) ◽  
pp. 71-83 ◽  
Author(s):  
I. A. Bond ◽  
N. J. Rattenbury ◽  
J. Skuljan ◽  
F. Abe ◽  
R. J. Dodd ◽  
...  
Keyword(s):  
Extrasolar Planets ◽  
High Magnification ◽  
Gravitational Microlensing

scholarly journals Gravitational microlensing I: A unique astrophysical tool

2015 ◽  
Vol 24 (07) ◽  
pp. 1530020 ◽  
Author(s):  
Sohrab Rahvar
Keyword(s):  
Gravitational Lensing ◽  
Galactic Halo ◽  
Mass Function ◽  
Line Of Sight ◽  
High Magnification ◽  
Gravitational Microlensing ◽  
Single Lens ◽  
History Of ◽  
Degeneracy Problem ◽  
Remnant Mass

In this paper, we review the astrophysical application of gravitational microlensing. After introducing the history of gravitational lensing, we present the key equations and concept of microlensing. The most frequent microlensing events are single-lens events and historically it has been used for searching dark matter in the form of compact astrophysical halo objects in the Galactic halo. We discuss about the degeneracy problem in the parameters of lens and perturbation effects that can partially break the degeneracy between the lens parameters. The rest of paper is about the astrophysical applications of microlensing. One of the important applications is in the stellar physics by probing the surface of source stars in the high magnification microlensing events. The astrometric and polarimetric observations will be complimentary for probing the atmosphere and stellar spots on the surface of source stars. Finally we discuss about the future projects as space-based telescopes for parallax and astrometry observations of microlensing events. With this project, we would expect to produce a complete stellar and remnant mass function and study the structure of Galaxy in term of distribution of stars along our line of sight towards the center of galaxy.

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