A New Application of the Astrometric Method to Break Severe Degeneracies in Binary Microlensing Events

Details A New Application of the Astrometric Method to Break Severe Degeneracies in Binary Microlensing Events A New Application of the Astrometric Method to Break Severe Degeneracies in Binary Microlensing Events

2009-01-28

arxiv.org/abs/0901.4411v2

Astrophys.J.695:1357-1361,2009

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

13 pages, 4 figures, 1 table, accepted for publication in ApJ

Scientific paper

10.1088/0004-637X/695/2/1357

When a source star is microlensed by one stellar component of a widely separated binary stellar components, after finishing the lensing event, the event induced by the other binary star can be additionally detected. In this paper, we investigate whether the close/wide degeneracies in binary lensing events can be resolved by detecting the additional centroid shift of the source images induced by the secondary binary star in wide binary lensing events. From this investigation, we find that if the source star passes close to the Einstein ring of the secondary companion, the degeneracy can be easily resolved by using future astrometric follow-up observations with high astrometric precision. We determine the probability of detecting the additional centroid shift in binary lensing events with high magnification. From this, we find that the degeneracy of binary lensing events with a separation of $\lesssim 20.0$ AU can be resolved with a significant efficiency. We also estimate the waiting time for the detection of the additional centroid shift in wide binary lensing events. We find that for typical Galactic lensing events with a separation of $\lesssim 20.0$ AU, the additional centroid shift can be detected within 100 days, and thus the degeneracy of those events can be sufficiently broken within a year.

Affiliated with

Also associated with

No associations

Rating

A New Application of the Astrometric Method to Break Severe Degeneracies in Binary Microlensing Events does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A New Application of the Astrometric Method to Break Severe Degeneracies in Binary Microlensing Events, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A New Application of the Astrometric Method to Break Severe Degeneracies in Binary Microlensing Events will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-344516