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Spitzer + VLTI-GRAVITY Measure the Lens Mass of a Nearby Microlensing Event

Zang, Weicheng ; Dong, Subo ; Gould, Andrew ; Calchi Novati, Sebastiano ; Chen, Ping ; Yang, Hongjing ; Li, Shun-Sheng ; Mao, Shude ; Alton, K. B. ; Brimacombe, J. ; Carey, Sean ; Christie, G. W. ; Delplancke-Ströbele, F. ; Feliz, Dax L. ; Gaudi, B. Scott ; Green, J. ; Hu, Shaoming ; Jayasinghe, T. ; Koff, R. A. ; Kurtenkov, A. ; Mérand, A. ; Minev, Milen ; Mutel, Robert ; Natusch, T. ; Roth, Tyler ; Shvartzvald, Yossi ; Sun, Fengwu ; Vanmunster, T. ; Zhu, Wei

The Astrophysical journal, 2020-07, Vol.897 (2), p.180 [Periódico revisado por pares]

Philadelphia: The American Astronomical Society

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Título:
Spitzer + VLTI-GRAVITY Measure the Lens Mass of a Nearby Microlensing Event
Autor: Zang, Weicheng ; Dong, Subo ; Gould, Andrew ; Calchi Novati, Sebastiano ; Chen, Ping ; Yang, Hongjing ; Li, Shun-Sheng ; Mao, Shude ; Alton, K. B. ; Brimacombe, J. ; Carey, Sean ; Christie, G. W. ; Delplancke-Ströbele, F. ; Feliz, Dax L. ; Gaudi, B. Scott ; Green, J. ; Hu, Shaoming ; Jayasinghe, T. ; Koff, R. A. ; Kurtenkov, A. ; Mérand, A. ; Minev, Milen ; Mutel, Robert ; Natusch, T. ; Roth, Tyler ; Shvartzvald, Yossi ; Sun, Fengwu ; Vanmunster, T. ; Zhu, Wei
Assuntos: Adaptive control ; Adaptive optics ; Black holes ; Distance measurement ; Gravitation ; Gravitational microlensing ; Interferometry ; Lenses ; Light curve ; Microlenses ; Optics ; Parallax ; Satellite microlensing parallax ; Satellite observation ; Stellar distance ; Stellar masses ; Very Large Telescope
É parte de: The Astrophysical journal, 2020-07, Vol.897 (2), p.180
Notas: AAS21594
Stars and Stellar Physics
Descrição: We report the lens mass and distance measurements of the nearby microlensing event TCP J05074264+2447555 (Kojima-1). We measure the microlens parallax vector using Spitzer and ground-based light curves with constraints on the direction of lens-source relative proper motion derived from Very Large Telescope Interferometer (VLTI) GRAVITY observations. Combining this determination with the angular Einstein radius measured by VLTI-GRAVITY observations, we find that the lens is a star with mass at a distance DL = 429 21 pc. We find that the blended light basically all comes from the lens. The lens-source proper motion is , so with currently available adaptive-optics instruments, the lens and source can be resolved in 2021. This is the first microlensing event whose lens mass is unambiguously measured by interferometry + satellite-parallax observations, which opens a new window for mass measurements of isolated objects such as stellar-mass black holes.
Editor: Philadelphia: The American Astronomical Society
Idioma: Inglês

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Spitzer + VLTI-GRAVITY Measure the Lens Mass of a Nearby Microlensing Event

Philadelphia: The American Astronomical Society

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