Spitzer Microlensing Parallax Reveals Two Isolated Stars in the Galactic Bulge

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  • Weicheng Zang
  • Yossi Shvartzvald
  • Tianshu Wang
  • Andrzej Udalski
  • Chung-Uk Lee
  • Takahiro Sumi
  • Jesper Skottfelt
  • Shun-Sheng Li
  • Shude Mao
  • Wei Zhu
  • Jennifer C. Yee
  • Sebastiano Calchi Novati
  • Charles A. Beichman
  • Geoffery Bryden
  • Sean Carey
  • B. Scott Gaudi
  • Calen B. Henderson
  • Przemek Mroz
  • Jan Skowron
  • Radoslaw Poleski
  • Michal K. Szymanski
  • Igor Soszynski
  • Pawel Pietrukowicz
  • Szymon Kozowski
  • Krzysztof Ulaczyk
  • Krzysztof A. Rybicki
  • Patryk Iwanek
  • Etienne Bachelet
  • Grant Christie
  • Jonathan Green
  • Steve Hennerley
  • Dan Maoz
  • Tim Natusch
  • Richard W. Pogge
  • Rachel A. Street
  • Yiannis Tsapras
  • Michael D. Albrow
  • Sun-Ju Chung
  • Andrew Gould
  • Cheongho Han
  • Kyu-Ha Hwang
  • Youn Kil Jung
  • Yoon-Hyun Ryu
  • In-Gu Shin
  • Sang-Mok Cha
  • Dong-Jin Kim
  • Hyoun-Woo Kim
  • Seung-Lee Kim
  • Dong-Joo Lee
  • Jørgensen, Uffe Gråe
  • Spitzer Team
  • OGLE Collaboration
  • LCO Follow-Up Team
  • FUN Follow-Up Team
  • KMTNet Collaboration
  • MOA Collaboration
  • MiNDSTEp Collaboration

We report the mass and distance measurements of two single-lens events from the 2017 Spitzer microlensing campaign. The ground-based observations yield the detection of finite-source effects, and the microlens parallaxes are derived from the joint analysis of ground-based observations and Spitzer observations. We find that the lens of OGLE-2017-BLG-1254 is a 0.60 +/- 0.03 M-circle dot star with D-LS = 0.53 +/- 0.11 kpc, where D-LS is the distance between the lens and the source. The second event, OGLE-2017-BLG-1161, is subject to the known satellite parallax degeneracy, and thus is either a 0.51(-0.10)(+0.12) M-circle dot star with D-LS = 0.40 +/- 0.12 kpc or a 0.38(-0.12)(+0.13) M-circle dot star with D-LS = 0.53 +/- 0.19 kpc. Both of the lenses are therefore isolated stars in the Galactic bulge. By comparing the mass and distance distributions of the eight published Spitzer finite-source events with the expectations from a Galactic model, we find that the Spitzer sample is in agreement with the probability of finite-source effects occurring in single-lens events.

OriginalsprogEngelsk
Artikelnummer3
TidsskriftAstrophysical Journal
Vol/bind891
Udgave nummer1
Antal sider11
ISSN0004-637X
DOI
StatusUdgivet - 1 mar. 2020

ID: 247168279