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Mass measurements of isolated objects from space-based microlensing

Zhu, W ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.3847/0004-637X/825/1/60
  3. Publisher: Institute of Physics Publishing , 2016
  4. Abstract:
  5. We report on the mass and distance measurements of two single-lens events from the 2015 Spitzer microlensing campaign. With both finite-source effect and microlens parallax measurements, we find that the lens of OGLE-2015-BLG-1268 is very likely a brown dwarf (BD). Assuming that the source star lies behind the same amount of dust as the Bulge red clump, we find the lens is a 45 ±7 BD at 5.9 ±1.0 kpc. The lens of of the second event, OGLE-2015-BLG-0763, is a 0.50 ±0.04 star at 6.9 ±1.0 kpc. We show that the probability to definitively measure the mass of isolated microlenses is dramatically increased once simultaneous ground- and space-based observations are conducted
  6. Keywords:
  7. Brown dwarfs ; Gravitational lensing: micro ; Stars: fundamental parameters
  8. Source: Astrophysical Journal ; Volume 825, Issue 1 , 2016 ; 0004637X (ISSN)
  9. URL: نویسنده ها خارجی اغلب ؟؟؟؟؟http://iopscience.iop.org/article/10.3847/0004-637X/825/1/60