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: ----------------------------------------------------------------- RA (2000) DE Designation(s) ----------------------------------------------------------------- 18 08 38.26 -30 03 38.7 OGLE-2019-BLG-0033 = MOA 2019-BLG-035 ----------------------------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- 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) -------------------------------------------------------------------------------- Byte-by-byte Description of file: a*.dat c*.dat f*.dat k*.dat o*.dat m*.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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) -------------------------------------------------------------------------------- Byte-by-byte Description of file: danishr.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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) -------------------------------------------------------------------------------- Byte-by-byte Description of file: lcogt*i.dat spitzerl.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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) -------------------------------------------------------------------------------- Acknowledgements: Valerio Bozza, valboz(at)sa.infn.it
(End) Valerio Bozza [Salerno, Italy], Patricia Vannier [CDS] 03-May-2022
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