Results 31 to 40 of about 9,232,537 (75)

Prediction of astrometric microlensing events from

open access: yes, 2018
Context. Astrometric gravitational microlensing is an excellent tool to determine the mass of stellar objects. Using precise astrometric measurements of the lensed position of a background source in combination with accurate predictions of the positions ...
J. Wambsganss   +3 more
core   +1 more source

Cloud-based e-Infrastructure for scheduling astronomical observations [PDF]

open access: yes, 2015
This research was pursued under the EPSRC grant ‘Working Together: Constraint Programming and Cloud Computing’ (EP/K015745/1) and an Amazon Web Services (AWS) Education Research Grant.Gravitational microlensing exploits a transient phenomenon where an ...
Barker, Adam David   +11 more
core   +1 more source

On the Exploration of Quasars and the Astrometric Microlensing Effect with the Gaia Satellite [PDF]

open access: yes, 2016
For two years, the Gaia satellite has been scanning the sky to obtain an unmatched positional accuracy of stars and a variety of data. In this thesis, we investigate two different kinds of questions with respect to Gaia. In our first research focus we explore Gaia data that is suitable to learn more about the structure of quasars. For this, we simulate
openaire  

Astrometric Microlensing of Quasars : Dependence on surface mass density and external shear

open access: yes, 2003
11 pages, 13 figures, accepted for publication in A&AA small fraction of all quasars are strongly lensed and multiply imaged, with usually a galaxy acting as the main lens.
Wambsganss, Joachim, Treyer, Marie
core   +3 more sources

Microlensing of circumstellar envelopes: II. emission lines from radial and azimuthal flow during fold caustic crossings [PDF]

open access: yes, 2003
This paper examines the line profile evolution due to bulk motion in circumstellar envelopes during microlensing fold caustic crossing events. These events have recently been shown to be a sensitive probe of stellar surface brightness profiles, thus ...
Bryce, H.M.   +5 more
core   +1 more source

Astrometric vs. photometric microlensing

open access: yes, 2001
I discuss the differences between the properties of astrometric and photometric microlensing and between the arising prospects for survey and follow-up experiments based on these two different signatures. In particular, the prospects for binary stars and
Dominik, M
core   +1 more source

Jupiter-like planets might be common in a low-density environment. [PDF]

open access: yesNat Commun, 2023
Gratton R   +8 more
europepmc   +1 more source

Ongoing astrometric microlensing events of two nearby stars

open access: yes, 2018
Context. Astrometric microlensing is an excellent tool to determine the mass of stellar objects. By measuring the astrometric shift of a background source star in combination with precise predictions of its unlensed position and of the lens position ...
J. Wambsganss   +3 more
core   +1 more source

OGLE 2008–BLG–290 : an accurate measurement of the limb darkening of a galactic bulge K giant spatially resolved by microlensing [PDF]

open access: yes, 2010
Context. Not only is gravitational microlensing a successful tool for discovering distant exoplanets, but it also enables characterization of the lens and source stars involved in the lensing event. Aims.
Riffeser, A.   +562 more
core   +1 more source

OGLE-2018-BLG-0022: First Prediction of an Astrometric Microlensing Signal from a Photometric Microlensing Event

open access: yes, 2023
In this work, we present the analysis of the binary microlensing event OGLE-2018-BLG-0022 that is detected toward the Galactic bulge field. The dense and continuous coverage with the high-quality photometry data from ground-based observations combined ...
Gaudi, B Scott   +66 more
core   +1 more source

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