Microlens Mass Measurement Using Triple-Peak Events | Zendy

J. An | Zendy; Andrew Gould | Zendy

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Microlens Mass Measurement Using Triple-Peak Events

Author(s) -

J. An,

Andrew Gould

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/338657

Subject(s) - gravitational microlensing , parallax , einstein radius , caustic (mathematics) , physics , microlens , radius , cusp (singularity) , binary number , lens (geology) , rotation (mathematics) , optics , astrophysics , astronomy , stars , geometry , mathematics , gravitational lens , computer security , redshift , arithmetic , galaxy , computer science , mathematical physics

We show that one can measure the effects of microlens parallax for binarymicrolensing events with three well-measured peaks -- two caustic crossingsplus a cusp approach, and hence derive the projected Einstein radius. Since theangular Einstein radius is measurable from finite source effects for almost anywell-observed caustic crossing, triple-peak events can yield the determinationof the lens mass. We note that, to a certain extent, rotation of the binary canmimic the effects of parallax, but it should often be possible to disentangleparallax from rotation by making use of the late-time light curve.Comment: revised version (abstract re-written, section 2 expanded), to appear in the Astrophysical Journal Letter

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