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Mass Measurements Of Isolated Objects From Space-Based Microlensing

Zhu, Wei; Calchi Novati, S.; Gould, A.; Udalski, A.; Han, C.; Shvartzvald, Y.; Ranc, C.; Jørgensen, U.G.; Poleski1, R.; Bozza, V.; Beichman, C.; Bryden, G.; Carey, S.; Gaudi, B.S.; Henderson, C.B.; Pogge, R.W.; Porritt, I.; Wibking, B.; Yee, J.C.; TEAM, SPITZER; Pawlak, M.; Szymański, M.K.; Skowron, J.; Mróz, P.; Kozłowski, S.; Ł. Wyrzykowski; Pietrukowicz, P.; Pietrzyński, G.; Soszyński, I.; Ulaczyk, K.; GROUP, OGLE; Choi, J.-Y.; Park, H.; Jung, Y.K.; Shin, I.-G.; Albrow, M.D.; Park, B.-G.; Kim, S.-L.; Lee, C.-U.; Cha, S.-M.; Kim, D.-J.; Lee, Y.; GROUP, KMTNET; Friedmann, M.; Kaspi, S.; Maoz, D.; GROUP, WISE; Hundertmark, M.; Street, R.A.; Tsapras, Y.; Bramich, D.M.; Cassan, A.; Dominik, M.; Bachelet, E.; Dong, Subo; Figuera Jaimes, R.; Horne, K.; Mao, S.; Menzies, J.; Schmidt, R.; Snodgrass, C.; Steele, I.A.; Wambsganss, J.; TEAM, ROBONET; Skottfelt, J.; Andersen, M.I.; Burgdorf, M.J.; Ciceri, S.; D'Ago, G.; Evans, D.F.; Gu, S.-H. ; Hinse, T.C.; Kerins, E.; Korhonen, H.; Kuffmeier, M...

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Authors

Wei Zhu

S. Calchi Novati

A. Gould

A. Udalski

C. Han

Y. Shvartzvald

C. Ranc

U.G. Jørgensen

R. Poleski1

V. Bozza

C. Beichman

G. Bryden

S. Carey

B.S. Gaudi

C.B. Henderson

R.W. Pogge

I. Porritt

B. Wibking

J.C. Yee

SPITZER TEAM

M. Pawlak

M.K. Szymański

J. Skowron

P. Mróz

S. Kozłowski

Ł. Wyrzykowski

P. Pietrukowicz

G. Pietrzyński

I. Soszyński

K. Ulaczyk

OGLE GROUP

J.-Y. Choi

H. Park

Y.K. Jung

I.-G. Shin

M.D. Albrow

B.-G. Park

S.-L. Kim

C.-U. Lee

S.-M. Cha

D.-J. Kim

Y. Lee

KMTNET GROUP

M. Friedmann

S. Kaspi

D. Maoz

WISE GROUP

M. Hundertmark

R.A. Street

Y. Tsapras

D.M. Bramich

A. Cassan

M. Dominik

E. Bachelet

Subo Dong

R. Figuera Jaimes

K. Horne

S. Mao

J. Menzies

R. Schmidt

C. Snodgrass

I.A. Steele

J. Wambsganss

ROBONET TEAM

J. Skottfelt

M.I. Andersen

M.J. Burgdorf

S. Ciceri

G. D'Ago

D.F. Evans

S.-H. Gu

T.C. Hinse

E. Kerins

H. Korhonen

M. Kuffmeier

L. Mancini

N. Peixinho

A. Popovas

M. Rabus

S. Rahvar

R. Tronsgaard

G. Scarpetta

J. Surdej

C. von Essen

Y.-B. Wang

O. Wertz

MINDSTEP GROUP



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.

Journal Article Type Article
Acceptance Date Apr 21, 2016
Publication Date Jun 27, 2016
Publicly Available Date Mar 28, 2024
Journal Astrophysical Journal
Print ISSN 0004-637X
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 825
Issue 1
Article Number 60
DOI https://doi.org/10.3847/0004-637X/825/1/60
Keywords brown dwarfs, gravitational lensing, micro, stars, fundamental parameters
Publisher URL http://dx.doi.org/10.3847/0004-637X/825/1/60

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