J/A+A/663/A100 OGLE-2019-BLG-0033/MOA-2019-BLG-035 light curves (Herald+, 2022)
Precision measurement of a brown dwarf mass in a binary system in the
microlensing event OGLE-2019-BLG-0033/MOA-2019-BLG-035.
Herald A., Udalski A., Bozza V., Rota P., Bond I.A., Yee J.C., Sajadian S.
Mroz P., Poleski R., Skowron J., Szymanski M.K., Soszynski I.,
Pietrukowicz P., Kozlowski S., Ulaczyk K., Rybicki K.A., Iwanek P.,
Wrona M., Gromadzki M. (The OGLE collaboration)
Abe F., Barry R., Bennett D.P., Bhattacharya A., Fukui A., Fujii H.,
Hirao Y., Itow Y., Kirikawa R., Kondo I., Koshimoto N., Matsubara Y.,
Matsumoto S., Miyazaki S., Muraki Y., Olmschenk G., Ranc C., Okamura A.,
Rattenbury N.J., Satoh Y., Sumi T., Suzuki D., Ishitani Silva S.,
Toda T., Tristram P.J., Vandorou A., Yama H. (The MOA collaboration)
Beichman C.A., Bryden G., Calchi Novati S., Carey S., Gaudi B.S.,
Gould A., Henderson C.B., Johnson S., Shvartzvald Y., Zhu W.
(The Spitzer team)
Dominik M., Hundertmark M., Jorgensen U.G., Longa-Pena P., Skottfelt J.,
Tregloan-Reed J., Bach-Moller N., Burgdorf M., D'Ago G., Haikala L.,
Hitchcock J., Khalouei E., Peixinho N., Rahvar S., Snodgrass C.,
Southworth J., Spyratos P. (The MiNDSTEp consortium)
Zang W., Yang H., Mao S., Bachelet E., Maoz D., Street R.A., Tsapras Y.,
Christie G.W., Cooper T., de Almeida L., do Nascimento Jr J.-D.,
Green J., Han C., Hennerley S., Marmont A., McCormick J.,
Monard L.A.G., Natusch T., Pogge R.
(The LCO & µFUN collaboration)
<Astron. Astrophys. 663, A100 (2022)>
=2022A&A...663A.100H 2022A&A...663A.100H (SIMBAD/NED BibCode)
ADC_Keywords: Gravitational lensing ; Stars, double and multiple ; Exoplanets ;
Photometry
Keywords: gravitational lensing: micro - binaries: general - brown dwarfs -
stars: low mass
Abstract:
Brown dwarfs are poorly understood transition objects between stars
and planets, with several competing mechanisms having been proposed
for their formation. Mass measurements are generally difficult for
isolated objects but also for brown dwarfs orbiting low-mass stars,
which are often too faint for spectroscopic follow-up.
Microlensing provides an alternative tool for the discovery and
investigation of such faint systems. Here we present the analysis of
the microlensing event OGLE-2019-BLG-0033/MOA-2019-BLG-035, which is
due to a binary system composed of a brown dwarf orbiting a red dwarf.
Thanks to extensive ground observations and the availability of space
observations from Spitzer, it has been possible to obtain accurate
estimates of all microlensing parameters, including parallax, source
radius and orbital motion of the binary lens.
After accurate modeling, we find that the lens is composed of a red
dwarf with mass M1=0.149±0.010M☉ and a brown dwarf with mass
M2=0.0463±0.0031M☉, at a projected separation of a=0.585au.
The system has a peculiar velocity that is typical of old metal-poor
populations in the thick disk. Percent precision in the mass
measurement of brown dwarfs has been achieved only in a few
microlensing events up to now, but will likely become common with the
Roman space telescope.
Description:
Photometric light curves of the event
OGLE-2019-BLG-0033/MOA-2019-BLG-035 collected by different
observatories around the world, including ground surveys, follow-up
professional and amateur telescopes, and observations from the Spitzer
spacecraft.
Objects:
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RA (2000) DE Designation(s)
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18 08 38.26 -30 03 38.7 OGLE-2019-BLG-0033 = MOA 2019-BLG-035
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
auckr.dat 26 79 Auckland Observatory (Wratten #12 filter)
ctioi.dat 26 198 SMARTS Cerro Tololo 1.3m (I-band)
danishr.dat 43 814 Danish 1.54m, La Silla (custom red filter)
farmu.dat 26 62 Farm Cove Observatory (unfiltered)
kkou.dat 26 426 Klein Karoo Observatory (unfiltered)
kumeur.dat 26 62 Kumeu Observatory (Wratten #12 filter)
lcogthi.dat 58 39 LCOGT Hawaii (i'-band)
lcogtri.dat 58 30 LCOGT SAAO (i'-band)
moar.dat 34 2570 MOA (custom R filter)
moav.dat 33 179 MOA (custom V filter)
oglei.dat 33 233 OGLE (I-band)
opdi.dat 26 137 Observtorio Pico dos Dias (unfiltered)
spitzerl.dat 52 29 Spitzer (lambda=3.6 micron)
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Byte-by-byte Description of file: a*.dat c*.dat f*.dat k*.dat o*.dat m*.dat
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Bytes Format Units Label Explanations
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1- 8 F8.4 mag maginst Instrumental magnitude
10- 15 F6.4 mag e_maginst Error on instrumental magnitude
17- 34 F18.13 d HJD Heliocentric Julian date (HJD-2450000)
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Byte-by-byte Description of file: danishr.dat
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Bytes Format Units Label Explanations
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1- 8 F8.6 mag maginst Instrumental magnitude
10- 25 F16.14 mag e_maginst Error on instrumental magnitude
27- 43 F17.12 d HJD Heliocentric Julian date (HJD-2450000)
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Byte-by-byte Description of file: lcogt*i.dat spitzerl.dat
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Bytes Format Units Label Explanations
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1- 18 F18.15 mag maginst Instrumental magnitude
20- 40 F21.19 mag e_maginst Error on instrumental magnitude
42- 58 F17.12 d HJD Heliocentric Julian date (HJD-2450000)
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Acknowledgements:
Valerio Bozza, valboz(at)sa.infn.it
(End) Valerio Bozza [Salerno, Italy], Patricia Vannier [CDS] 03-May-2022