J/AJ/164/75 Light curve of microlensing MOA-2019-BLG-008L (Bachelet+, 2022)
MOA-2019-BLG-008Lb; A New Microlensing Detection of an Object at the
Planet/Brown Dwarf Boundary.
Bachelet E., Tsapras Y., Gould A., Street R.A., Bennett D.P.,
Hundertmark M.P.G., Bozza V., Bramich D.M., Cassan A., Dominik M., Horne K.,
Mao S., Saha A., Wambsganss J., Zang W., Abe F., Barry R., Bennett D.P.,
Bhattacharya A., Bond I.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., Silva S.I., Toda T., Tristram P..J.,
Vandorou A., Yama H., Albrow M.D., Chung S.-J., Han C., Hwang K.-H.,
Jung Y.K., Ryu Y.-H., Shin I.-G., Shvartzvald Y., Yee J.C., Cha S.-M.,
Kim D.-J., Kim S.-L., Lee C.-U., Lee D.-J., Lee Y., Park B.-G., Pogge R.W.,
Udalski A., 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 ROME/REA Collaboration, The MOA Collaboration,
The KMTNet Collaboration, The OGLE Collaboration
<Astron. J., 164, 75 (2022)>
=2022AJ....164...75B 2022AJ....164...75B
ADC_Keywords: Gravitational lensing; Stars, brown dwarf; Exoplanets;
Photometry, VRI
Keywords: Exoplanets
Abstract:
We report on the observations, analysis and interpretation of the
microlensing event MOA-2019-BLG-008. The observed anomaly in the
photometric light curve is best described through a binary lens model.
In this model, the source did not cross caustics and no finite-source
effects were observed. Therefore, the angular Einstein ring radius
θE cannot be measured from the light curve alone. However, the
large event duration, tE∼80days, allows a precise measurement of the
microlensing parallax πE. In addition to the constraints on the
angular radius θ* and the apparent brightness Is of the source,
we employ the Besancon and GalMod galactic models to estimate the
physical properties of the lens. We find excellent agreement between
the predictions of the two galactic models: the companion is likely a
resident of the brown dwarf desert with a mass Mp∼30MJup, and the host
is a main-sequence dwarf star. The lens lies along the line of sight
to the Galactic bulge, at a distance of ≲4kpc. We estimate that in
about 10 yr the lens and source will be separated by ∼55mas, and it
will be possible to confirm the exact nature of the lensing system by
using high-resolution imaging from ground- or space-based
observatories.
Description:
The microlensing event MOA-2019-BLG-008 was first announced on 2019
February 4 by the Microlensing Observations in Astrophysics (MOA)
Collaboration, which operates the 1.8m MOA survey telescope at Mount
John observatory in New Zealand.
The event was also independently identified by the Early Warning
System (EWS) of the Optical Gravitational Lensing Experiment (OGLE)
survey as OGLE-2019-BLG-0011. OGLE observations were carried out with
the 1.3m Warsaw telescope at Las Campanas Observatory in Chile, with
the 32-chip mosaic CCD camera.
Additional observations were obtained by the ROME/REA survey using
6x1m telescopes from the southern ring of the global robotic telescope
network of the Las Cumbres Observatory (LCO). The LCO telescopes are
located at the Cerro Tololo International Observatory (CTIO) in Chile,
South African Astronomical Observatory (SAAO) in South Africa, and
Siding Spring Observatory (SSO) in Australia.
The event lies in fields BLG02 and BLG42 of the Korea Microlensing
Telescopes Network (KMTNet) and so was intensely monitored by that
survey, although KMTNet did not independently discover the event.
Objects:
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RA (2000) DE Designation(s)
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17 51 55.92 -29 59 23.1 MOA-2019-BLG-008L = MOA 2019-BLG-8
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig2.dat 38 20980 Light curve
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See also:
II/341 : VPHAS+ DR2 survey (Drew+, 2016)
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
J/MNRAS/349/1059 : OGLE variables in Galactic bar (Wray+, 2004)
J/ApJ/640/1051 : 25pc sample of Sun-like stars (Grether+, 2006)
J/A+A/453/635 : Modelling Galactic Interstellar Extinction (Marshall+, 2006)
J/ApJ/670/1367 : Gemini Deep Planet Survey (Lafreniere+, 2007)
J/ApJ/680/728 : Diameters of exoplanet host stars (Baines+, 2008)
J/ApJS/181/62 : Survey of young solar analogs (Metchev+, 2009)
J/ApJ/694/1085 : Radii of exoplanet host stars (van Belle+, 2009)
J/A+A/529/A102 : MOA-2007-BLG-387Lb light curve I band (Batista+, 2011)
J/ApJ/761/57 : CHARA array angular diameters of HR 8799 (Baines+, 2012)
J/ApJ/746/101 : Diameters and temperatures of AFG stars (Boyajian+, 2012)
J/other/Nat/481.167 : 2002-2007 PLANET microlensing events (Assan+, 2012)
J/A+A/537/A116 : Variables in Centaurus field F170 (Pietrukowicz+, 2012)
J/A+A/549/A147 : Abundances microlensed bulge dwarf stars. V. (Bensby+, 2013)
J/A+A/549/A109 : HARPS XXXI. The M-dwarf sample (Bonfils+, 2013)
J/ApJ/771/40 : Main-sequence A, F, G, & K stars photometry (Boyajian+, 2013)
J/A+A/558/A53 : Milky Way global survey star clusters. II. (Kharchenko+, 2013)
J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)
J/AcA/63/21 : VI light curves of Galactic LPVs (Soszynski+, 2013)
J/MNRAS/457/1320 : OGLE-III planet detection efficiency (Tsapras+, 2016)
J/A+A/609/A116 : Low extinction TGAS HR Catalogue (Ruiz-Dern+, 2018)
J/A+A/631/A125 : 54 massive companions detected with SOPHIE (Kiefer+, 2019)
J/ApJS/244/29 : Microlensing events toward the Galactic bulge (Mroz+, 2019)
J/AJ/158/13 : The first 300 stars observed by the GPIES (Nielsen+, 2019)
J/ApJS/247/44 : Mira-like variables from the KELT survey (Arnold+, 2020)
J/AJ/159/63 : New AO obs. of exoplanets & brown dwarf comp. (Bowler+, 2020)
J/ApJ/903/L11 : OGLE & KMTNet light curve of OGLE-2016-BLG-1928 (Mroz+, 2020)
J/A+A/649/A3 : Gaia EDR3 photometric passbands (Riello+, 2021)
Byte-by-byte Description of file: fig2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Tel Telescope identifier
10- 11 A2 --- Filt Filter; V, R, I, gp, ip or rp
13- 24 F12.4 d HJD [2457800/2458931] Heliocentric Julian Date
26- 32 F7.3 mag mag [-12.6/21.5] Apparent magnitude in Filter
34- 38 F5.3 mag e_mag [0.001/3.5] Uncertainty in mag
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 04-Nov-2022