J/AJ/160/148 RI-band LC of microlensing event OGLE-2018-BLG-1269Lb (Jung+, 2020)
OGLE-2018-BLG-1269Lb: a jovian planet with a Bright I=16 host.
Jung Y.K., Gould A., Udalski A., Sumi T., Yee J.C., Han C., Albrow M.D.,
Chung S.-J., Hwang K.-H., Ryu Y.-H., Shin I.-G., Shvartzvald Y., Zhu W.,
Zang W., Cha S.-M., Kim D.-J., Kim H.-W., 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., Abe F., Barry R., Bennett D.P.,
Bond I.A., Bhattacharya A., Donachie M., Fukui A., Hirao Y., Itow Y.,
Kondo I., Koshimoto N., Li M.C.A., Matsubara Y., Miyazaki S., Muraki Y.,
Nagakane M., Ranc C., Rattenbury N.J., Suematsu H., Sullivan D.J.,
Suzuki D., Tristram P.J., Yonehara A.
<Astron. J., 160, 148 (2020)>
=2020AJ....160..148J 2020AJ....160..148J
ADC_Keywords: Exoplanets; Gravitational lensing; Photometry, RI
Keywords: Gravitational microlensing ;
Gravitational microlensing exoplanet detection
Abstract:
We report the discovery of a planet in the microlensing event
OGLE-2018-BLG-1269 with a planet-host mass ratio q∼6x10-4, i.e., 0.6
times smaller than the Jupiter/Sun mass ratio. Combined with the Gaia
parallax and proper motion, a strong one-dimensional constraint on the
microlens parallax vector allows us to significantly reduce the
uncertainties of lens physical parameters. A Bayesian analysis that
ignores any information about light from the host yields that the
planet is a cold giant (M2=0.69-0.22+0.44MJ) orbiting a
Sun-like star (M1=1.13-0.35+0.72M☉) at a distance of
DL=2.56-0.62+0.92kpc. The projected planet-host separation is
a⊥=4.61-1.17+1.70au. Using Gaia astrometry, we show that
the blended light lies ≲12mas from the host and therefore must be
either the host star or a stellar companion to the host. An isochrone
analysis favors the former possibility at >99.6%. The host is
therefore a subgiant. For host metallicities in the range of
0.0≤[Fe/H]≤+0.3, the host and planet masses are then in the range of
1.16≤M1/M☉≤1.38 and 0.74≤M2/MJ≤0.89, respectively. Low
host metallicities are excluded. The brightness and proximity of the
lens make the event a strong candidate for spectroscopic follow-up
both to test the microlensing solution and to further characterize the
system.
Description:
The event OGLE-2018-BLG-1269 was first discovered on July 12 by the
Optical Gravitational Lensing Experiment (OGLE). The event was in the
OGLE BLG504.27 field with a nominal cadence of 10times/night using the
1.3m Warsaw Telescope located at the Las Campanas Observatory in
Chile.
This event was independently found on August 5 by the Microlensing
Observations in Astrophysics (MOA) survey. The MOA survey monitored
the event with a 15 minute cadence using the 1.8m MOA-II telescope
located at Mt. John Observatory in New Zealand.
The KMTNet survey also discovered the event from its annual postseason
analysis. This survey used three 1.6m telescopes that are distributed
over three different continents, i.e., Chile (KMTC), South Africa
(KMTS), and Australia (KMTA). The event was in two offset fields
(BLG03 and BLG43) and thus was monitored with the cadence of four
times/hr.
Objects:
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RA (2000) DE Designation(s)
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17 58 46.42 -27 37 04.6 EWS 2018-BLG-1269 KMT-2018-BLG-2418
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
kmta03i.dat 30 1788 Observed light curve of OGLE-2018-BLG-1269Lb
from KMTA03 in the I band
kmta43i.dat 30 1956 Observed light curve of OGLE-2018-BLG-1269Lb
from KMTA43 in the I band
kmtc03i.dat 30 2008 Observed light curve of OGLE-2018-BLG-1269Lb
from KMTC03 in the I band
kmtc43i.dat 30 1740 Observed light curve of OGLE-2018-BLG-1269Lb
from KMTC43 in the I band
kmts03i.dat 30 1032 Observed light curve of OGLE-2018-BLG-1269Lb
from KMTS03 in the I band
kmts43i.dat 30 1033 Observed light curve of OGLE-2018-BLG-1269Lb
from KMTS43 in the I band
moar.dat 30 6811 Observed light curve of OGLE-2018-BLG-1269Lb
from MOA in the R band
oglei.dat 30 5480 Observed light curve of OGLE-2018-BLG-1269Lb
from OGLE in the I band
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See also:
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/AcA/50/421 : OGLE-II DIA BUL_SC1 field (Wozniak, 2000)
J/A+A/428/587 : Cepheids BVRIJHK dereddened magnitudes (Kervella+, 2004)
J/A+A/529/A102 : MOA-2007-BLG-387Lb light curve I band (Batista+, 2011)
J/ApJ/756/52 : R-band light curve of QSO J0158-4325 images (Morgan+, 2012)
J/A+A/549/A147 : Abundances of microlensed bulge dwarf stars.V. (Bensby+, 2013)
J/A+A/616/A183 : R-band light curves of PG 1115+080 (Bonvin+, 2018)
J/AJ/159/98 : I LC of the microlensing event KMT-2016-BLG-1836 (Yang+, 2020)
J/AJ/159/116 : I-band light curves of OGLE-2015-BLG-1771Lb (Zhang+, 2020)
J/AJ/159/256 : Light curve of OGLE-2018-BLG-0677 (Herrera-Martin+, 2020)
Byte-by-byte Description of file: kmt[acs][04]3i.dat moar.dat oglei.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
13- 21 F9.6 mag mag Observed magnitude
23- 30 F8.6 mag e_mag Uncertainty in mag
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 13-Nov-2020