J/AJ/162/267 I-band light curve of OGLE-2019-BLG-1058 with KMTNet (Shin+, 2021)
Using Source Proper Motion to Validate Terrestrial Parallax: OGLE-2019-BLG-1058.
Shin I.-G., Yee J.C., Hwang K.-H., Udalski A., Gould A., Albrow M.D.,
Chung S.-J., Han C., Jung Y.K., Kim H.-W., Ryu Y.-H., Shvartzvald Y.,
Zang W., Cha S.-M., Kim D.-J., Kim S.-L., Lee C.-U., 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, 267 (2021)>
=2021AJ....162..267S 2021AJ....162..267S
ADC_Keywords: Gravitational lensing; Photometry, RI; Exoplanets
Keywords: Gravitational microlensing ; Gravitational microlensing exoplanet
detection ; Microlensing parallax ; Free floating planets
Abstract:
We show that because the conditions for producing terrestrial
microlens parallax (TPRX; i.e., a nearby disk lens) will also tend to
produce a large lens-source relative proper motion (µrel), source
proper motion (µS) measurements in general provide a strong test of
TPRX signals, which Gould & Yee (2013) showed were an important probe
of free-floating planet (FFP) candidates. As a case study, we report a
single-lens/single-source microlensing event designated as
OGLE-2019-BLG-1058. For this event, the short timescale (∼2.5days) and
very fast µrel (∼17.6mas/yr) suggest that this isolated lens is an
FFP candidate located in the disk of our Galaxy. For this event, we
find a TPRX signal consistent with a disk FFP, but at low
significance. A direct measurement of the µS shows that the large
µrel is due to an extreme µS, and thus, the lens is consistent
with being a very-low-mass star in the bulge and the TPRX measurement
is likely spurious. By contrast, we show how a precise measurement of
µS with the mean properties of the bulge proper motion distribution
would have given the opposite result; i.e., provided supporting
evidence for an FFP in the disk and the TPRX measurement.
Description:
This event was first discovered by the Optical Gravitational Lensing
Experiment (OGLE-IV) survey using the Warsaw 1.3m telescope with 1.4
square-degree camera, which is located at the Las Campanas Observatory
in Chile.The Korea Microlensing Telescope Network (KMTNet)
independently discovered this event (assigned KMT-2019-BLG-1538) on
2019 July 7 (03:16 UT) using its network of three identical 1.6 m
telescopes with 4 square-degree cameras. The telescopes of the KMTNet
are located at the Cerro Tololo Inter-American Observatory in Chile
(KMTC), the South African Astronomical Observatory in South Africa
(KMTS), and the Siding Spring Observatory in Australia (KMTA).
Objects:
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RA (2000) DE Designation(s)
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17 54 25.02 -28 36 48.8 OGLE-2019-BLG-1058 = KMT-2019-BLG-1538
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
kmta.dat 34 1394 I band light curve from KMTA
kmtc.dat 34 2224 I band light curve from KMTC
kmts.dat 34 1841 I band light curve from KMTS
ogle.dat 34 2547 I band light curve from OGLE
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/A+A/363/1081 : Non-linear limb-darkening law for LTE models (Claret 2000)
J/AcA/50/421 : OGLE-II DIA BUL_SC1 field (Wozniak, 2000)
J/AJ/133/1795 : Globulettes in four HII regions (Gahm+, 2007)
J/A+A/533/A134 : Abundances of microlensed stars in the Bulge (Bensby+, 2011)
J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)
J/ApJ/783/121 : BANYAN II. Nearby young assoc. candidate memb (Gagne+, 2014)
J/A+A/565/A107 : Globulettes in the Carina nebula (Grenman+, 2014)
J/AJ/147/34 : SpeX library of L-type dwarfs (Schneider+, 2014)
J/ApJS/216/7 : Planets Around Low-Mass Stars (PALMS). IV. (Bowler+, 2015)
J/AJ/159/262 : OGLE/KMTnet VI photometry OGLE-2019-BLG-0551 (Mroz+, 2020)
J/AJ/159/116 : I-band light curves of OGLE-2015-BLG-1771Lb (Zhang+, 2020)
J/AJ/162/17 : KMTNet, MOA & OGLE light curve KMT-2019-BLG-0371 (Kim+, 2021)
J/AJ/161/126 : I-band LC of microlensing event KMT-2017-BLG-2820 (Ryu+, 2021)
Byte-by-byte Description of file: kmta.dat kmtc.dat kmts.dat ogle.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d HJD Heliocentric Julian Date, HJD-2450000.0
13- 23 F11.8 mag Imag I-band magnitude
25- 34 F10.8 mag e_Imag Error in Imag
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 04-Mar-2022