The Astrophysical Journal (Jan 2024)
First Resolution of Microlensed Images of a Binary-lens Event
- Zexuan Wu,
- Subo Dong,
- A. Mérand,
- Christopher S. Kochanek,
- Przemek Mróz,
- Jinyi Shangguan,
- Grant Christie,
- Thiam-Guan Tan,
- Thomas Bensby,
- Joss Bland-Hawthorn,
- Sven Buder,
- Frank Eisenhauer,
- Andrew P. Gould,
- Janez Kos,
- Tim Natusch,
- Sanjib Sharma,
- Andrzej Udalski,
- J. Woillez,
- David A. H. Buckley,
- I. B. Thompson,
- Karim Abd El Dayem,
- Anthony Berdeu,
- Jean-Philippe Berger,
- Guillaume Bourdarot,
- Wolfgang Brandner,
- Richard I. Davies,
- Denis Defrère,
- Catherine Dougados,
- Antonia Drescher,
- Andreas Eckart,
- Maximilian Fabricius,
- Helmut Feuchtgruber,
- Natascha M. Förster Schreiber,
- Paulo Garcia,
- Reinhard Genzel,
- Stefan Gillessen,
- Gernot Heißel,
- Sebastian Hönig,
- Mathis Houlle,
- Pierre Kervella,
- Laura Kreidberg,
- Sylvestre Lacour,
- Olivier Lai,
- Romain Laugier,
- Jean-Baptiste Le Bouquin,
- James Leftley,
- Bruno Lopez,
- Dieter Lutz,
- Felix Mang,
- Florentin Millour,
- Miguel Montargès,
- Hugo Nowacki,
- Mathias Nowak,
- Thomas Ott,
- Thibaut Paumard,
- Karine Perraut,
- Guy Perrin,
- Romain Petrov,
- Pierre-Olivier Petrucci,
- Nicolas Pourre,
- Sebastian Rabien,
- Diogo C. Ribeiro,
- Sylvie Robbe-Dubois,
- Matteo Sadun Bordoni,
- Daryl Santos,
- Jonas Sauter,
- Jules Scigliuto,
- Taro T. Shimizu,
- Christian Straubmeier,
- Eckhard Sturm,
- Matthias Subroweit,
- Calvin Sykes,
- Linda Tacconi,
- Frédéric Vincent,
- Felix Widmann,
- the GRAVITY+ collaboration
Affiliations
- Zexuan Wu
- ORCiD
- Department of Astronomy, School of Physics, Peking University , 5 Yiheyuan Road, Haidian District, Beijing 100871, People's Republic of China ; [email protected]; Kavli Institute of Astronomy and Astrophysics, Peking University , 5 Yiheyuan Road, Haidian District, Beijing 100871, People's Republic of China
- Subo Dong
- ORCiD
- Department of Astronomy, School of Physics, Peking University , 5 Yiheyuan Road, Haidian District, Beijing 100871, People's Republic of China ; [email protected]; Kavli Institute of Astronomy and Astrophysics, Peking University , 5 Yiheyuan Road, Haidian District, Beijing 100871, People's Republic of China; National Astronomical Observatories, Chinese Academy of Science , 20A Datun Road, Chaoyang District, Beijing 100101, People's Republic of China
- A. Mérand
- ORCiD
- European Southern Observatory , Karl-Schwarzschild-Straße 2, D-85748 Garching, Germany
- Christopher S. Kochanek
- ORCiD
- Department of Astronomy, Ohio State University , 140 W. 18th Avenue, Columbus, OH 43210, USA; Center for Cosmology and AstroParticle Physics (CCAPP), The Ohio State University , 191 W. Woodruff Avenue, Columbus, OH 43210, USA
- Przemek Mróz
- ORCiD
- Astronomical Observatory, University of Warsaw , Al. Ujazdowskie 4, 00-478 Warszawa, Poland
- Jinyi Shangguan
- ORCiD
- Max Planck Institute for Extraterrestrial Physics , Giessenbachstraße 1, D-85748 Garching, Germany
- Grant Christie
- Auckland Observatory , Auckland, New Zealand
- Thiam-Guan Tan
- ORCiD
- Perth Exoplanet Survey Telescope , Perth, Australia
- Thomas Bensby
- ORCiD
- Lund Observatory, Division of Astrophysics, Department of Physics, Lund University , Box 118, SE-22100 Lund, Sweden
- Joss Bland-Hawthorn
- ORCiD
- Sydney Institute for Astronomy, School of Physics, A28, The University of Sydney , NSW 2006, Australia; ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) , Australia
- Sven Buder
- ORCiD
- ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) , Australia; Research School of Astronomy and Astrophysics, The Australian National University , Canberra ACT2611, Australia
- Frank Eisenhauer
- Max Planck Institute for Extraterrestrial Physics , Giessenbachstraße 1, D-85748 Garching, Germany; Department of Physics, Technical University of Munich , 85748 Garching, Germany
- Andrew P. Gould
- Department of Astronomy, Ohio State University , 140 W. 18th Avenue, Columbus, OH 43210, USA; Max Planck Institute for Astronomy , Königstuhl 17, 69117 Heidelberg, Germany
- Janez Kos
- ORCiD
- Faculty of Mathematics and Physics, University of Ljubljana , Jadranska 19, 1000 Ljubljana, Slovenia
- Tim Natusch
- Auckland Observatory , Auckland, New Zealand; Mathematical Sciences Department, Auckland University of Technology , Auckland, New Zealand
- Sanjib Sharma
- ORCiD
- Sydney Institute for Astronomy, School of Physics, A28, The University of Sydney , NSW 2006, Australia; ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) , Australia
- Andrzej Udalski
- ORCiD
- Astronomical Observatory, University of Warsaw , Al. Ujazdowskie 4, 00-478 Warszawa, Poland
- J. Woillez
- ORCiD
- European Southern Observatory , Karl-Schwarzschild-Straße 2, D-85748 Garching, Germany
- David A. H. Buckley
- ORCiD
- South African Astronomical Observatory , P.O. Box 9, Observatory 7935, Cape Town, South Africa
- I. B. Thompson
- ORCiD
- Carnegie Observatories , 813 Santa Barbara Street, Pasadena, CA 91101-1292, USA
- Karim Abd El Dayem
- LESIA, Observatoire de Paris, Université PSL , Sorbonne Université, Université Paris Cité, CNRS, 5 place Jules Janssen, 92195 Meudon, France
- Anthony Berdeu
- LESIA, Observatoire de Paris, Université PSL , Sorbonne Université, Université Paris Cité, CNRS, 5 place Jules Janssen, 92195 Meudon, France
- Jean-Philippe Berger
- Univ. Grenoble Alpes , CNRS, IPAG, 38000 Grenoble, France
- Guillaume Bourdarot
- Max Planck Institute for Extraterrestrial Physics , Giessenbachstraße 1, D-85748 Garching, Germany
- Wolfgang Brandner
- ORCiD
- Max Planck Institute for Astronomy , Königstuhl 17, 69117 Heidelberg, Germany
- Richard I. Davies
- ORCiD
- Max Planck Institute for Extraterrestrial Physics , Giessenbachstraße 1, D-85748 Garching, Germany
- Denis Defrère
- ORCiD
- Institute of Astronomy , KU Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
- Catherine Dougados
- Univ. Grenoble Alpes , CNRS, IPAG, 38000 Grenoble, France
- Antonia Drescher
- Max Planck Institute for Extraterrestrial Physics , Giessenbachstraße 1, D-85748 Garching, Germany
- Andreas Eckart
- ORCiD
- 1st Institute of Physics, University of Cologne , Zülpicher Straße 77, 50937 Cologne, Germany; Max Planck Institute for Radio Astronomy , Auf dem Hügel 69, 53121 Bonn, Germany
- Maximilian Fabricius
- ORCiD
- Max Planck Institute for Extraterrestrial Physics , Giessenbachstraße 1, D-85748 Garching, Germany
- Helmut Feuchtgruber
- Max Planck Institute for Extraterrestrial Physics , Giessenbachstraße 1, D-85748 Garching, Germany
- Natascha M. Förster Schreiber
- ORCiD
- Max Planck Institute for Extraterrestrial Physics , Giessenbachstraße 1, D-85748 Garching, Germany
- Paulo Garcia
- Faculdade de Engenharia, Universidade do Porto , R Dr. Roberto Frias s/n, 4200-465 Porto, Portugal; CENTRA—Centro de Astrofísica e Gravitação, IST, Universidade de Lisboa , 1049-001 Lisboa, Portugal
- Reinhard Genzel
- ORCiD
- Max Planck Institute for Extraterrestrial Physics , Giessenbachstraße 1, D-85748 Garching, Germany; Departments of Physics and Astronomy, Le Conte Hall, University of California , Berkeley, CA 94720, USA
- Stefan Gillessen
- ORCiD
- Max Planck Institute for Extraterrestrial Physics , Giessenbachstraße 1, D-85748 Garching, Germany
- Gernot Heißel
- LESIA, Observatoire de Paris, Université PSL , Sorbonne Université, Université Paris Cité, CNRS, 5 place Jules Janssen, 92195 Meudon, France
- Sebastian Hönig
- School of Physics & Astronomy, University of Southampton , University Road, Southampton SO17 1BJ, UK
- Mathis Houlle
- Université Còte d’Azur , Observatoire de la Còte d’Azur, CNRS, Laboratoire Lagrange, CS 34229, F-06304 Nice cedex 4, France
- Pierre Kervella
- ORCiD
- LESIA, Observatoire de Paris, Université PSL , Sorbonne Université, Université Paris Cité, CNRS, 5 place Jules Janssen, 92195 Meudon, France
- Laura Kreidberg
- ORCiD
- Max Planck Institute for Astronomy , Königstuhl 17, 69117 Heidelberg, Germany
- Sylvestre Lacour
- ORCiD
- European Southern Observatory , Karl-Schwarzschild-Straße 2, D-85748 Garching, Germany; LESIA, Observatoire de Paris, Université PSL , Sorbonne Université, Université Paris Cité, CNRS, 5 place Jules Janssen, 92195 Meudon, France
- Olivier Lai
- Université Còte d’Azur , Observatoire de la Còte d’Azur, CNRS, Laboratoire Lagrange, CS 34229, F-06304 Nice cedex 4, France
- Romain Laugier
- Institute of Astronomy , KU Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
- Jean-Baptiste Le Bouquin
- ORCiD
- Univ. Grenoble Alpes , CNRS, IPAG, 38000 Grenoble, France
- James Leftley
- ORCiD
- Université Còte d’Azur , Observatoire de la Còte d’Azur, CNRS, Laboratoire Lagrange, CS 34229, F-06304 Nice cedex 4, France
- Bruno Lopez
- Université Còte d’Azur , Observatoire de la Còte d’Azur, CNRS, Laboratoire Lagrange, CS 34229, F-06304 Nice cedex 4, France
- Dieter Lutz
- ORCiD
- Max Planck Institute for Extraterrestrial Physics , Giessenbachstraße 1, D-85748 Garching, Germany
- Felix Mang
- Max Planck Institute for Extraterrestrial Physics , Giessenbachstraße 1, D-85748 Garching, Germany
- Florentin Millour
- Université Còte d’Azur , Observatoire de la Còte d’Azur, CNRS, Laboratoire Lagrange, CS 34229, F-06304 Nice cedex 4, France
- Miguel Montargès
- ORCiD
- LESIA, Observatoire de Paris, Université PSL , Sorbonne Université, Université Paris Cité, CNRS, 5 place Jules Janssen, 92195 Meudon, France
- Hugo Nowacki
- Univ. Grenoble Alpes , CNRS, IPAG, 38000 Grenoble, France
- Mathias Nowak
- LESIA, Observatoire de Paris, Université PSL , Sorbonne Université, Université Paris Cité, CNRS, 5 place Jules Janssen, 92195 Meudon, France
- Thomas Ott
- ORCiD
- Max Planck Institute for Extraterrestrial Physics , Giessenbachstraße 1, D-85748 Garching, Germany
- Thibaut Paumard
- ORCiD
- LESIA, Observatoire de Paris, Université PSL , Sorbonne Université, Université Paris Cité, CNRS, 5 place Jules Janssen, 92195 Meudon, France
- Karine Perraut
- Univ. Grenoble Alpes , CNRS, IPAG, 38000 Grenoble, France
- Guy Perrin
- ORCiD
- LESIA, Observatoire de Paris, Université PSL , Sorbonne Université, Université Paris Cité, CNRS, 5 place Jules Janssen, 92195 Meudon, France
- Romain Petrov
- Université Còte d’Azur , Observatoire de la Còte d’Azur, CNRS, Laboratoire Lagrange, CS 34229, F-06304 Nice cedex 4, France
- Pierre-Olivier Petrucci
- ORCiD
- Univ. Grenoble Alpes , CNRS, IPAG, 38000 Grenoble, France
- Nicolas Pourre
- Univ. Grenoble Alpes , CNRS, IPAG, 38000 Grenoble, France
- Sebastian Rabien
- Max Planck Institute for Extraterrestrial Physics , Giessenbachstraße 1, D-85748 Garching, Germany
- Diogo C. Ribeiro
- Max Planck Institute for Extraterrestrial Physics , Giessenbachstraße 1, D-85748 Garching, Germany
- Sylvie Robbe-Dubois
- Université Còte d’Azur , Observatoire de la Còte d’Azur, CNRS, Laboratoire Lagrange, CS 34229, F-06304 Nice cedex 4, France
- Matteo Sadun Bordoni
- Max Planck Institute for Extraterrestrial Physics , Giessenbachstraße 1, D-85748 Garching, Germany
- Daryl Santos
- Max Planck Institute for Extraterrestrial Physics , Giessenbachstraße 1, D-85748 Garching, Germany
- Jonas Sauter
- Max Planck Institute for Astronomy , Königstuhl 17, 69117 Heidelberg, Germany
- Jules Scigliuto
- Université Còte d’Azur , Observatoire de la Còte d’Azur, CNRS, Laboratoire Lagrange, CS 34229, F-06304 Nice cedex 4, France
- Taro T. Shimizu
- Max Planck Institute for Extraterrestrial Physics , Giessenbachstraße 1, D-85748 Garching, Germany
- Christian Straubmeier
- ORCiD
- 1st Institute of Physics, University of Cologne , Zülpicher Straße 77, 50937 Cologne, Germany
- Eckhard Sturm
- ORCiD
- Max Planck Institute for Extraterrestrial Physics , Giessenbachstraße 1, D-85748 Garching, Germany
- Matthias Subroweit
- 1st Institute of Physics, University of Cologne , Zülpicher Straße 77, 50937 Cologne, Germany
- Calvin Sykes
- ORCiD
- School of Physics & Astronomy, University of Southampton , University Road, Southampton SO17 1BJ, UK
- Linda Tacconi
- ORCiD
- Max Planck Institute for Extraterrestrial Physics , Giessenbachstraße 1, D-85748 Garching, Germany
- Frédéric Vincent
- ORCiD
- LESIA, Observatoire de Paris, Université PSL , Sorbonne Université, Université Paris Cité, CNRS, 5 place Jules Janssen, 92195 Meudon, France
- Felix Widmann
- Max Planck Institute for Extraterrestrial Physics , Giessenbachstraße 1, D-85748 Garching, Germany
- the GRAVITY+ collaboration
- DOI
- https://doi.org/10.3847/1538-4357/ad90b9
- Journal volume & issue
-
Vol. 977,
no. 2
p. 229
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 θ _E = 0.724 ± 0.002 mas and microlens parallax, we determine that the lens system consists of two M dwarfs with masses of M _1 = 0.258 ± 0.008 M _⊙ and M _2 = 0.130 ± 0.007 M _⊙ , a projected separation of r _⊥ = 6.83 ± 0.31 au, and a distance of D _L = 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.
Keywords
