Microlensing Binaries with Candidate Brown Dwarf Companions

I.-G. Shin; C. Han; A. Gould; A. Udalski; T. Sumi; M. Dominik; J.-P Beaulieu; Y. Tsapras; V. Bozza; Uffe Gråe Jørgensen; Kennet Bomann West Harpsøe; Jesper Fælling Skottfelt

doi:10.1088/0004-637X/760/2/116

Microlensing Binaries with Candidate Brown Dwarf Companions

I.-G. Shin, C. Han, A. Gould, A. Udalski, T. Sumi, M. Dominik, J.-P Beaulieu, Y. Tsapras, V. Bozza, Uffe Gråe Jørgensen, Kennet Bomann West Harpsøe, Jesper Fælling Skottfelt

Astrofysik og Planetforskning

14 Citationer (Scopus)

Abstract

Brown dwarfs are important objects because they may provide a missing link between stars and planets, two populations that have dramatically different formation histories. In this paper, we present the candidate binaries with brown dwarf companions that are found by analyzing binary microlensing events discovered during the 2004-2011 observation seasons. Based on the low mass ratio criterion of q < 0.2, we found seven candidate events: OGLE-2004-BLG-035, OGLE-2004-BLG-039, OGLE-2007-BLG-006, OGLE-2007-BLG-399/MOA-2007-BLG-334, MOA-2011-BLG-104/OGLE-2011-BLG-0172, MOA-2011-BLG-149, and MOA-201-BLG-278/OGLE- 2011-BLG-012N. Among them, we are able to confirm that the companions of the lenses of MOA-2011-BLG-104/OGLE-2011-BLG-0172 and MOA-2011-BLG-149 are brown dwarfs by determining the mass of the lens based on the simultaneous measurement of the Einstein radius and the lens parallax. The measured masses of the brown dwarf companions are 0.02 ± 0.01 M and 0.019 ± 0.002 M for MOA-2011-BLG-104/OGLE-2011-BLG-0172 and MOA-2011-BLG-149, respectively, and both companions are orbiting low-mass M dwarf host stars. More microlensing brown dwarfs are expected to be detected as the number of lensing events with well-covered light curves increases with new-generation searches.

Originalsprog	Engelsk
Tidsskrift	Astrophysical Journal
Vol/bind	760
Udgave nummer	2
Sider (fra-til)	116
ISSN	0004-637X
DOI	https://doi.org/10.1088/0004-637X/760/2/116
Status	Udgivet - 1 dec. 2012

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10.1088/0004-637X/760/2/116

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title = "Microlensing Binaries with Candidate Brown Dwarf Companions",

abstract = "Brown dwarfs are important objects because they may provide a missing link between stars and planets, two populations that have dramatically different formation histories. In this paper, we present the candidate binaries with brown dwarf companions that are found by analyzing binary microlensing events discovered during the 2004-2011 observation seasons. Based on the low mass ratio criterion of q < 0.2, we found seven candidate events: OGLE-2004-BLG-035, OGLE-2004-BLG-039, OGLE-2007-BLG-006, OGLE-2007-BLG-399/MOA-2007-BLG-334, MOA-2011-BLG-104/OGLE-2011-BLG-0172, MOA-2011-BLG-149, and MOA-201-BLG-278/OGLE- 2011-BLG-012N. Among them, we are able to confirm that the companions of the lenses of MOA-2011-BLG-104/OGLE-2011-BLG-0172 and MOA-2011-BLG-149 are brown dwarfs by determining the mass of the lens based on the simultaneous measurement of the Einstein radius and the lens parallax. The measured masses of the brown dwarf companions are 0.02 ± 0.01 M and 0.019 ± 0.002 M for MOA-2011-BLG-104/OGLE-2011-BLG-0172 and MOA-2011-BLG-149, respectively, and both companions are orbiting low-mass M dwarf host stars. More microlensing brown dwarfs are expected to be detected as the number of lensing events with well-covered light curves increases with new-generation searches.",

author = "I.-G. Shin and C. Han and A. Gould and A. Udalski and T. Sumi and M. Dominik and J.-P Beaulieu and Y. Tsapras and V. Bozza and J{\o}rgensen, {Uffe Gr{\aa}e} and Harps{\o}e, {Kennet Bomann West} and Skottfelt, {Jesper F{\ae}lling}",

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T1 - Microlensing Binaries with Candidate Brown Dwarf Companions

AU - Shin, I.-G.

AU - Han, C.

AU - Gould, A.

AU - Udalski, A.

AU - Sumi, T.

AU - Dominik, M.

AU - Beaulieu, J.-P

AU - Tsapras, Y.

AU - Bozza, V.

AU - Jørgensen, Uffe Gråe

AU - Harpsøe, Kennet Bomann West

AU - Skottfelt, Jesper Fælling

PY - 2012/12/1

Y1 - 2012/12/1

N2 - Brown dwarfs are important objects because they may provide a missing link between stars and planets, two populations that have dramatically different formation histories. In this paper, we present the candidate binaries with brown dwarf companions that are found by analyzing binary microlensing events discovered during the 2004-2011 observation seasons. Based on the low mass ratio criterion of q < 0.2, we found seven candidate events: OGLE-2004-BLG-035, OGLE-2004-BLG-039, OGLE-2007-BLG-006, OGLE-2007-BLG-399/MOA-2007-BLG-334, MOA-2011-BLG-104/OGLE-2011-BLG-0172, MOA-2011-BLG-149, and MOA-201-BLG-278/OGLE- 2011-BLG-012N. Among them, we are able to confirm that the companions of the lenses of MOA-2011-BLG-104/OGLE-2011-BLG-0172 and MOA-2011-BLG-149 are brown dwarfs by determining the mass of the lens based on the simultaneous measurement of the Einstein radius and the lens parallax. The measured masses of the brown dwarf companions are 0.02 ± 0.01 M and 0.019 ± 0.002 M for MOA-2011-BLG-104/OGLE-2011-BLG-0172 and MOA-2011-BLG-149, respectively, and both companions are orbiting low-mass M dwarf host stars. More microlensing brown dwarfs are expected to be detected as the number of lensing events with well-covered light curves increases with new-generation searches.

AB - Brown dwarfs are important objects because they may provide a missing link between stars and planets, two populations that have dramatically different formation histories. In this paper, we present the candidate binaries with brown dwarf companions that are found by analyzing binary microlensing events discovered during the 2004-2011 observation seasons. Based on the low mass ratio criterion of q < 0.2, we found seven candidate events: OGLE-2004-BLG-035, OGLE-2004-BLG-039, OGLE-2007-BLG-006, OGLE-2007-BLG-399/MOA-2007-BLG-334, MOA-2011-BLG-104/OGLE-2011-BLG-0172, MOA-2011-BLG-149, and MOA-201-BLG-278/OGLE- 2011-BLG-012N. Among them, we are able to confirm that the companions of the lenses of MOA-2011-BLG-104/OGLE-2011-BLG-0172 and MOA-2011-BLG-149 are brown dwarfs by determining the mass of the lens based on the simultaneous measurement of the Einstein radius and the lens parallax. The measured masses of the brown dwarf companions are 0.02 ± 0.01 M and 0.019 ± 0.002 M for MOA-2011-BLG-104/OGLE-2011-BLG-0172 and MOA-2011-BLG-149, respectively, and both companions are orbiting low-mass M dwarf host stars. More microlensing brown dwarfs are expected to be detected as the number of lensing events with well-covered light curves increases with new-generation searches.

U2 - 10.1088/0004-637X/760/2/116

DO - 10.1088/0004-637X/760/2/116

M3 - Journal article

SN - 0004-637X

VL - 760

SP - 116

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

ER -

Microlensing Binaries with Candidate Brown Dwarf Companions

Abstract

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