First Resolution of Microlensed Images of a Binary-Lens Event
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| Format: | Preprint |
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2024
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| author | Wu, Zexuan Dong, Subo Mérand, A. Kochanek, Christopher S. Mróz, Przemek Shangguan, Jinyi Christie, Grant Tan, Thiam-Guan Bensby, Thomas Bland-Hawthorn, Joss Buder, Sven Eisenhauer, Frank Gould, Andrew P. Kos, Janez Natusch, Tim Sharma, Sanjib Udalski, Andrzej Woillez, J. Buckley, David A. H. Thompson, I. B. Dayem, Karim Abd El Berdeu, Anthony Berger, Jean-Philippe Bourdarot, Guillaume Brandner, Wolfgang Davies, Richard I. Defrère, Denis Dougados, Catherine Drescher, Antonia Eckart, Andreas Fabricius, Maximilian Feuchtgruber, Helmut Schreiber, Natascha M. Förster Garcia, Paulo Genzel, Reinhard Gillessen, Stefan Heißel, Gernot Hönig, Sebastian Houlle, Mathis Kervella, Pierre Kreidberg, Laura Lacour, Sylvestre Lai, Olivier Laugier, Romain Bouquin, Jean-Baptiste Le Leftley, James Lopez, Bruno Lutz, Dieter Mang, Felix Millour, Florentin Montargès, Miguel Nowacki, Hugo Nowak, Mathias Ott, Thomas Paumard, Thibaut Perraut, Karine Perrin, Guy Petrov, Romain Petrucci, Pierre-Olivier Pourre, Nicolas Rabien, Sebastian Ribeiro, Diogo C. Robbe-Dubois, Sylvie Bordoni, Matteo Sadun Santos, Daryl Sauter, Jonas Scigliuto, Jules Shimizu, Taro T. Straubmeier, Christian Sturm, Eckhard Subroweit, Matthias Sykes, Calvin Tacconi, Linda Vincent, Frédéric Widmann, Felix |
| author_facet | Wu, Zexuan Dong, Subo Mérand, A. Kochanek, Christopher S. Mróz, Przemek Shangguan, Jinyi Christie, Grant Tan, Thiam-Guan Bensby, Thomas Bland-Hawthorn, Joss Buder, Sven Eisenhauer, Frank Gould, Andrew P. Kos, Janez Natusch, Tim Sharma, Sanjib Udalski, Andrzej Woillez, J. Buckley, David A. H. Thompson, I. B. Dayem, Karim Abd El Berdeu, Anthony Berger, Jean-Philippe Bourdarot, Guillaume Brandner, Wolfgang Davies, Richard I. Defrère, Denis Dougados, Catherine Drescher, Antonia Eckart, Andreas Fabricius, Maximilian Feuchtgruber, Helmut Schreiber, Natascha M. Förster Garcia, Paulo Genzel, Reinhard Gillessen, Stefan Heißel, Gernot Hönig, Sebastian Houlle, Mathis Kervella, Pierre Kreidberg, Laura Lacour, Sylvestre Lai, Olivier Laugier, Romain Bouquin, Jean-Baptiste Le Leftley, James Lopez, Bruno Lutz, Dieter Mang, Felix Millour, Florentin Montargès, Miguel Nowacki, Hugo Nowak, Mathias Ott, Thomas Paumard, Thibaut Perraut, Karine Perrin, Guy Petrov, Romain Petrucci, Pierre-Olivier Pourre, Nicolas Rabien, Sebastian Ribeiro, Diogo C. Robbe-Dubois, Sylvie Bordoni, Matteo Sadun Santos, Daryl Sauter, Jonas Scigliuto, Jules Shimizu, Taro T. Straubmeier, Christian Sturm, Eckhard Subroweit, Matthias Sykes, Calvin Tacconi, Linda Vincent, Frédéric Widmann, Felix |
| contents | 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 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_sun and M_2 = 0.130 +/- 0.007 M_sun, a projected separation of r_\perp = 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_13015 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | First Resolution of Microlensed Images of a Binary-Lens Event Wu, Zexuan Dong, Subo Mérand, A. Kochanek, Christopher S. Mróz, Przemek Shangguan, Jinyi Christie, Grant Tan, Thiam-Guan Bensby, Thomas Bland-Hawthorn, Joss Buder, Sven Eisenhauer, Frank Gould, Andrew P. Kos, Janez Natusch, Tim Sharma, Sanjib Udalski, Andrzej Woillez, J. Buckley, David A. H. Thompson, I. B. Dayem, Karim Abd El Berdeu, Anthony Berger, Jean-Philippe Bourdarot, Guillaume Brandner, Wolfgang Davies, Richard I. Defrère, Denis Dougados, Catherine Drescher, Antonia Eckart, Andreas Fabricius, Maximilian Feuchtgruber, Helmut Schreiber, Natascha M. Förster Garcia, Paulo Genzel, Reinhard Gillessen, Stefan Heißel, Gernot Hönig, Sebastian Houlle, Mathis Kervella, Pierre Kreidberg, Laura Lacour, Sylvestre Lai, Olivier Laugier, Romain Bouquin, Jean-Baptiste Le Leftley, James Lopez, Bruno Lutz, Dieter Mang, Felix Millour, Florentin Montargès, Miguel Nowacki, Hugo Nowak, Mathias Ott, Thomas Paumard, Thibaut Perraut, Karine Perrin, Guy Petrov, Romain Petrucci, Pierre-Olivier Pourre, Nicolas Rabien, Sebastian Ribeiro, Diogo C. Robbe-Dubois, Sylvie Bordoni, Matteo Sadun Santos, Daryl Sauter, Jonas Scigliuto, Jules Shimizu, Taro T. Straubmeier, Christian Sturm, Eckhard Subroweit, Matthias Sykes, Calvin Tacconi, Linda Vincent, Frédéric Widmann, Felix Solar and Stellar Astrophysics Astrophysics of Galaxies Instrumentation and Methods for Astrophysics 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 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_sun and M_2 = 0.130 +/- 0.007 M_sun, a projected separation of r_\perp = 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. |
| title | First Resolution of Microlensed Images of a Binary-Lens Event |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2409.13015 |