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First resolution of microlensed images of a binary-lens event

First resolution of microlensed images of a binary-lens event
First resolution of microlensed images of a binary-lens event
We resolve the multiple images of the binary-lens microlensing event ASASSN-22av using the GRAVITY instrument of the Very Large Telescope Interferometer (VLTI). The light curves show weak binary-lens perturbations, complicating the analysis, but the joint modeling with the VLTI data breaks several degeneracies, arriving at a strongly favored solution. Thanks to precise measurements of the angular Einstein radius θE = 0.724 ± 0.002 mas and microlens parallax, we determine that the lens system consists of two M dwarfs with masses of M1 = 0.258 ± 0.008 M⊙ and M2 = 0.130 ± 0.007 M⊙, a projected separation of r⊥ = 6.83 ± 0.31 au, and a distance of DL = 2.29 ± 0.08 kpc. The successful VLTI observations of ASASSN-22av open up a new path for studying intermediate-separation (i.e., a few astronomical units) stellar-mass binaries, including those containing dark compact objects such as neutron stars and stellar-mass black holes.
astro-ph.SR, astro-ph.GA, astro-ph.IM
Wu, Zexuan
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Dong, Subo
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Mérand, A.
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Kochanek, Christopher S.
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Mróz, Przemek
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Shangguan, Jinyi
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Christie, Grant
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Tan, Thiam-Guan
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Bensby, Thomas
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Bland-Hawthorn, Joss
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Buder, Sven
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Eisenhauer, Frank
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Gould, Andrew P.
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Kos, Janez
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Natusch, Tim
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Sharma, Sanjib
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Udalski, Andrzej
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Woillez, J.
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Buckley, David A.H.
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Thompson, I.B.
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Dayem, Karim Abd El
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Berdeu, Anthony
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Berger, Jean-Philippe
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Bourdarot, Guillaume
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Brandner, Wolfgang
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Davies, Richard I.
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Defrère, Denis
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Dougados, Catherine
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Drescher, Antonia
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Eckart, Andreas
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Fabricius, Maximilian
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Feuchtgruber, Helmut
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Schreiber, Natascha M. Förster
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Garcia, Paulo
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Genzel, Reinhard
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Gillessen, Stefan
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Heißel, Gernot
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Hönig, Sebastian
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Houlle, Mathis
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Kervella, Pierre
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Kreidberg, Laura
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Lacour, Sylvestre
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Lai, Olivier
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Laugier, Romain
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Bouquin, Jean-Baptiste Le
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Leftley, James
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Lopez, Bruno
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Lutz, Dieter
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Mang, Felix
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Sykes, Calvin
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et al.
Wu, Zexuan
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Dong, Subo
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Mérand, A.
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Kochanek, Christopher S.
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Mróz, Przemek
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Shangguan, Jinyi
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Christie, Grant
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Tan, Thiam-Guan
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Bensby, Thomas
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Bland-Hawthorn, Joss
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Buder, Sven
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Eisenhauer, Frank
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Gould, Andrew P.
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Kos, Janez
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Natusch, Tim
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Sharma, Sanjib
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Udalski, Andrzej
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Woillez, J.
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Buckley, David A.H.
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Thompson, I.B.
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Dayem, Karim Abd El
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Berdeu, Anthony
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Berger, Jean-Philippe
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Bourdarot, Guillaume
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Brandner, Wolfgang
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Davies, Richard I.
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Defrère, Denis
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Dougados, Catherine
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Drescher, Antonia
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Eckart, Andreas
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Fabricius, Maximilian
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Feuchtgruber, Helmut
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Schreiber, Natascha M. Förster
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Garcia, Paulo
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Genzel, Reinhard
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Gillessen, Stefan
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Heißel, Gernot
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Hönig, Sebastian
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Houlle, Mathis
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Kervella, Pierre
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Kreidberg, Laura
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Lacour, Sylvestre
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Lai, Olivier
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Laugier, Romain
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Bouquin, Jean-Baptiste Le
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Leftley, James
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Lopez, Bruno
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Lutz, Dieter
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Mang, Felix
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Sykes, Calvin
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Wu, Zexuan, Dong, Subo and Mérand, A. , et al. (2024) First resolution of microlensed images of a binary-lens event. The Astrophysical Journal, 977 (2), [229]. (doi:10.3847/1538-4357/ad90b9).

Record type: Article

Abstract

We resolve the multiple images of the binary-lens microlensing event ASASSN-22av using the GRAVITY instrument of the Very Large Telescope Interferometer (VLTI). The light curves show weak binary-lens perturbations, complicating the analysis, but the joint modeling with the VLTI data breaks several degeneracies, arriving at a strongly favored solution. Thanks to precise measurements of the angular Einstein radius θE = 0.724 ± 0.002 mas and microlens parallax, we determine that the lens system consists of two M dwarfs with masses of M1 = 0.258 ± 0.008 M⊙ and M2 = 0.130 ± 0.007 M⊙, a projected separation of r⊥ = 6.83 ± 0.31 au, and a distance of DL = 2.29 ± 0.08 kpc. The successful VLTI observations of ASASSN-22av open up a new path for studying intermediate-separation (i.e., a few astronomical units) stellar-mass binaries, including those containing dark compact objects such as neutron stars and stellar-mass black holes.

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2409.13015v3 - Author's Original
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Wu_2024_ApJ_977_229 - Version of Record
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Accepted/In Press date: 7 November 2024
Published date: 17 December 2024
Keywords: astro-ph.SR, astro-ph.GA, astro-ph.IM
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Identifiers

Local EPrints ID: 498083
URI: http://eprints.soton.ac.uk/id/eprint/498083
DOI: doi:10.3847/1538-4357/ad90b9
PURE UUID: 363148c4-991d-4597-87f8-f4ff2a18f504
ORCID for Calvin Sykes: ORCID iD orcid.org/0000-0003-3819-3023

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Date deposited: 07 Feb 2025 17:39
Last modified: 22 Aug 2025 02:34

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Contributors

Author: Zexuan Wu
Author: Subo Dong
Author: A. Mérand
Author: Christopher S. Kochanek
Author: Przemek Mróz
Author: Jinyi Shangguan
Author: Grant Christie
Author: Thiam-Guan Tan
Author: Thomas Bensby
Author: Joss Bland-Hawthorn
Author: Sven Buder
Author: Frank Eisenhauer
Author: Andrew P. Gould
Author: Janez Kos
Author: Tim Natusch
Author: Sanjib Sharma
Author: Andrzej Udalski
Author: J. Woillez
Author: David A.H. Buckley
Author: I.B. Thompson
Author: Karim Abd El Dayem
Author: Anthony Berdeu
Author: Jean-Philippe Berger
Author: Guillaume Bourdarot
Author: Wolfgang Brandner
Author: Richard I. Davies
Author: Denis Defrère
Author: Catherine Dougados
Author: Antonia Drescher
Author: Andreas Eckart
Author: Maximilian Fabricius
Author: Helmut Feuchtgruber
Author: Natascha M. Förster Schreiber
Author: Paulo Garcia
Author: Reinhard Genzel
Author: Stefan Gillessen
Author: Gernot Heißel
Author: Sebastian Hönig
Author: Mathis Houlle
Author: Pierre Kervella
Author: Laura Kreidberg
Author: Sylvestre Lacour
Author: Olivier Lai
Author: Romain Laugier
Author: Jean-Baptiste Le Bouquin
Author: James Leftley
Author: Bruno Lopez
Author: Dieter Lutz
Author: Felix Mang
Author: Calvin Sykes ORCID iD
Corporate Author: et al.

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