J/AJ/162/203 Photometry of OGLE-2019-BLG-0304 with OGLE & KMTNet (Han+, 2021)
OGLE-2019-BLG-0304: Competing Interpretations between a Planet-binary Model and
a Binary-source + Binary-lens Model.
Han, Han C., Udalski A., Lee C.-U., Kim D., Ryu Y.-H., Albrow M.D., Chung
S.-J., Gould A., Hwang K.-H., Kil Jung Y., Kim H.-W., Shin I.-G.,
Shvartzvald Y., Yee J.C., Zang W., Cha S.-M., Kim D.-J., Kim S.-L., Lee
D.-J., Lee Y., Park B.-G., Pogge R.W., Mroz P., Szymanski M.K., Skowron J.,
Poleski R., Soszynski I., Pietrukowicz P., Kozlowski S., Ulaczyk K., Rybicki
K.A., Iwanek P., Wrona M., Gromadzki M.
<Astron. J., 162, 203 (2021)>
=2021AJ....162..203H 2021AJ....162..203H
ADC_Keywords: Gravitational lensing; Exoplanets; Photometry, RI
Keywords: Gravitational microlensing exoplanet detection
Abstract:
We analyze the microlensing event OGLE-2019-BLG-0304, whose light
curve exhibits two distinctive features: a deviation in the peak
region and a second bump appearing ∼61days after the main peak.
Although a binary-lens model can explain the overall features, it
leaves subtle but noticeable residuals in the peak region. We find
that the residuals can be explained by the presence of either a
planetary companion located close to the primary of the binary lens
(3L1S model) or an additional close companion to the source (2L2S
model). Although the 3L1S model is favored over the 2L2S model, with
Δχ2∼8, securely resolving the degeneracy between the two
models is difficult with the currently available photometric data.
According to the 3L1S interpretation, the lens is a planetary system,
in which a planet with a mass 0.51-0.23+0.51MJ is in an S-type
orbit around a binary composed of stars with masses
0.27-0.12+0.27M☉ and 0.10-0.04+0.10M☉. According to
the 2L2S interpretation, however, the source is composed of G- and
K-type giant stars and the lens is composed of a low-mass M dwarf and
a brown dwarf with masses 0.12-0.05+0.12M☉ and
0.045-.019+0.045M☉, respectively. The event illustrates the
need for thorough model testing in the interpretation of lensing
events with complex features in light curves.
Description:
The lensing event was first found by the Early Warning System of the
Optical Gravitational Microlensing Experiment (OGLE) survey on 2019
March 16. The OGLE survey utilized the 1.3m telescope located at the
Las Campanas Observatory in Chile and the telescope is equipped with a
camera yielding a 1.4deg2 field of view. The event was rediscovered
by the Korea Microlensing Telescope Network survey in its post-season
analysis, and it was dubbed KMT-2019-BLG-2583. The KMTNet survey
employed three identical 1.6m telescopes located at the Siding Spring
Observatory (KMTA) in Australia, the Cerro Tololo Inter-American
Observatory (KMTC) in South America, and the South African
Astronomical Observatory (KMTS) in Africa. The camera mounted on each
KMTNet telescope yields a 4deg2 field of view.
Objects:
----------------------------------------------------------------
RA (2000) DE Designation(s)
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17 36 06.41 -26 08 45.6 OGLE-2019-BLG-0304 = EWS 2019-BLG-304
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig1.dat 28 5603 Light curve of the microlensing event
OGLE-2019-BLG-0304
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See also:
II/213 : OGLE Galactic Bulge periodic variables (Udalski+ 1996)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/AJ/137/3181 : HW Vir differential VR light curves (Lee+, 2009)
J/A+A/549/A147 : Abundances of microlensed bulge dwarf stars. V (Bensby+, 2013)
J/AJ/159/256 : Light curve of OGLE-2018-BLG-0677 (Herrera-Martin+, 2020)
J/AJ/159/116 : I-band light curves of OGLE-2015-BLG-1771Lb (Zhang+, 2020)
J/A+A/649/A90 : KMT-2018-BLG-1025Lb I light curve (Han+, 2021)
Byte-by-byte Description of file: fig1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Inst Instrument used (1)
6- 15 F10.5 d HJD [7415/8779] Heliocentric Julian Date; HJD-2450000
17- 22 F6.3 mag Imag [13.7/18.3] Apparent I band magnitude
24- 28 F5.3 mag e_Imag [0.002/0.07] Uncertainty in Imag
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Note (1): Instruments as follows:
KMTA = Korea Microlensing Telescope Network at
the Siding Springs Observatory;
KMTC = Korea Microlensing Telescope Network at
the Cerro Tololo Inter-Amerian Osvervatory;
KMTS = Korea Microlensing Telescope Network at
the South African Astronomical Observator;
OGLE = Optical Gravitational Microlensing Experiment survey.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 11-Jan-2022