Spitzer + VLTI-GRAVITY Measure the Lens Mass of a Nearby Microlensing Event
Zang,Weicheng1; Dong,Subo2; Gould,Andrew3,4; Calchi Novati,Sebastiano5; Chen,Ping2,6; Yang,Hongjing1; Li,Shun-Sheng7,8; Mao,Shude1,7; Alton,K. B.9; Brimacombe,J.10; Carey,Sean11; Christie,G. W.12; Delplancke-Str?bele,F.13; Feliz,Dax L.14; Gaudi,B. Scott4; Green,J.15; Hu,Shaoming16; Jayasinghe,T.4,17; Koff,R. A.18; Kurtenkov,A.19; Mérand,A.13; Minev,Milen20; Mutel,Robert21; Natusch,T.22; Roth,Tyler21; Shvartzvald,Yossi23; Sun,Fengwu24; Vanmunster,T.25; Zhu,Wei26
Source PublicationThe Astrophysical Journal
AbstractAbstract 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.
KeywordGravitational microlensing Satellite microlensing parallax Stellar masses Stellar distance
WOS IDIOP:0004-637X-897-2-ab9749
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Department of Astronomy and Tsinghua Centre for Astrophysics, Tsinghua University, Beijing 100084, People's Republic of China
2.Kavli Institute for Astronomy and Astrophysics, Peking University, Yi He Yuan Road 5, Hai Dian District, Beijing 100871, People's Republic of China
3.Max-Planck-Institute for Astronomy, K?nigstuhl 17, D-69117 Heidelberg, Germany
4.Department of Astronomy, Ohio State University, 140 W. 18th Avenue, Columbus, OH 43210, USA
5.IPAC, Mail Code 100-22, Caltech, 1200 E. California Boulevard, Pasadena, CA 91125, USA
6.Department of Astronomy, School of Physics, Peking University, Yi He Yuan Road 5, Hai Dian District, Beijing 100871, People's Republic of China
7.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China
8.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
9.Desert Blooms Observatory, Chile
10.Coral Towers Observatory, Cairns, Queensland 4870, Australia
11.Spitzer Science Center, MS 220-6, California Institute of Technology, Pasadena, CA, USA
12.Auckland Observatory, Box 24180, Auckland, New Zealand
13.European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching, Germany
14.Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235, USA
15.Kumeu Observatory, Kumeu, New Zealand
16.Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, People's Republic of China
17.Center for Cosmology and AstroParticle Physics (CCAPP), The Ohio State University, 191 W. Woodruff Avenue, Columbus, OH 43210, USA
18.Antelope Hills Observatory, 980 Antelope Drive West, Bennett, CO 80102, USA
19.Institute of Astronomy and National Astronomical Observatory, Bulgarian Academy of Sciences, 72 Tsarigradsko Shose Boulevard, 1784 Sofia, Bulgaria
20.Department of Astronomy, Faculty of Physics, University of Sofia, 1164 Sofia, Bulgaria
21.Department of Physics and Astronomy, University of Iowa, USA
22.Institute for Radio Astronomy and Space Research, AUT University, Auckland, New Zealand
23.Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 76100, Israel
24.Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA
25.Center for Backyard Astrophysics Belgium, Walhostraat 1A, B-3401 Landen, Belgium
26.Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St George Street, Toronto, ON M5S 3H8, Canada
Recommended Citation
GB/T 7714
Zang,Weicheng,Dong,Subo,Gould,Andrew,et al. Spitzer + VLTI-GRAVITY Measure the Lens Mass of a Nearby Microlensing Event[J]. The Astrophysical Journal,2020,897(2).
APA Zang,Weicheng.,Dong,Subo.,Gould,Andrew.,Calchi Novati,Sebastiano.,Chen,Ping.,...&Zhu,Wei.(2020).Spitzer + VLTI-GRAVITY Measure the Lens Mass of a Nearby Microlensing Event.The Astrophysical Journal,897(2).
MLA Zang,Weicheng,et al."Spitzer + VLTI-GRAVITY Measure the Lens Mass of a Nearby Microlensing Event".The Astrophysical Journal 897.2(2020).
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