Mass Measurements of Isolated Objects from Space-based Microlensing

SPITZER TEAM; Ogle Group; KMTNET GROUP; WISE GROUP; ROBONET TEAM; MINDSTEP GROUP

doi:10.3847/0004-637X/825/1/60

Mass Measurements of Isolated Objects from Space-based Microlensing

SPITZER TEAM, Ogle Group, KMTNET GROUP , WISE GROUP , ROBONET TEAM, MINDSTEP GROUP

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Abstract

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 ${M}_{{\rm{J}}}$ BD at 5.9 ± 1.0 kpc. The lens of of the second event, OGLE-2015-BLG-0763, is a 0.50 ± 0.04 ${M}_{\odot }$ 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.

Original language	English
Article number	60
Journal	The Astrophysical Journal
Volume	825
Issue number	1
DOIs	https://doi.org/10.3847/0004-637X/825/1/60
Publication status	Published - 27 Jun 2016

Keywords

Astrophysics - Solar and Stellar Astrophysics
Astrophysics - Earth and Planetary Astrophysics

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title = "Mass Measurements of Isolated Objects from Space-based Microlensing",

abstract = "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 \$\{M\}\_\{\{\textbackslash{}rm\{J\}\}\}\$ BD at 5.9 ± 1.0 kpc. The lens of of the second event, OGLE-2015-BLG-0763, is a 0.50 ± 0.04 \$\{M\}\_\{\textbackslash{}odot \}\$ 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.",

keywords = "Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics",

author = "Eamonn Kerins and \{SPITZER TEAM\} and \{Ogle Group\} and \{KMTNET GROUP\} and \{WISE GROUP\} and \{ROBONET TEAM\} and \{MINDSTEP GROUP\}",

year = "2016",

month = jun,

day = "27",

doi = "10.3847/0004-637X/825/1/60",

language = "English",

volume = "825",

journal = "The Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

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TY - JOUR

T1 - Mass Measurements of Isolated Objects from Space-based Microlensing

AU - Kerins, Eamonn

AU - SPITZER TEAM

AU - Ogle Group

AU - KMTNET GROUP

AU - WISE GROUP

AU - ROBONET TEAM

AU - MINDSTEP GROUP

PY - 2016/6/27

Y1 - 2016/6/27

N2 - 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 ${M}_{{\rm{J}}}$ BD at 5.9 ± 1.0 kpc. The lens of of the second event, OGLE-2015-BLG-0763, is a 0.50 ± 0.04 ${M}_{\odot }$ 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.

AB - 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 ${M}_{{\rm{J}}}$ BD at 5.9 ± 1.0 kpc. The lens of of the second event, OGLE-2015-BLG-0763, is a 0.50 ± 0.04 ${M}_{\odot }$ 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.

KW - Astrophysics - Solar and Stellar Astrophysics

KW - Astrophysics - Earth and Planetary Astrophysics

U2 - 10.3847/0004-637X/825/1/60

DO - 10.3847/0004-637X/825/1/60

M3 - Article

SN - 0004-637X

VL - 825

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 1

M1 - 60

ER -

Mass Measurements of Isolated Objects from Space-based Microlensing

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Keywords

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