J/AJ/161/293 LCs of OGLE-2018-BLG-0567 and OGLE-2018-BLG-0962 (Jung+, 2021)
OGLE-2018-BLG-0567Lb and OGLE-2018-BLG-0962Lb: two microlensing planets through
the planetary-caustic channel.
Jung Y., Han C., Udalski A., Gould A., Yee J.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.
<Astron. J., 161, 293 (2021)>
=2021AJ....161..293J 2021AJ....161..293J
ADC_Keywords: Exoplanets; Gravitational lensing; Photometry, VRI
Keywords: Gravitational microlensing ;
Gravitational microlensing exoplanet detection
Abstract:
We present the analyses of two microlensing events, OGLE-2018-BLG-0567
and OGLE-2018-BLG-0962. In both events, the short-lasting anomalies
were densely and continuously covered by two high-cadence surveys. The
light-curve modeling indicates that the anomalies are generated by
source crossings over the planetary caustics induced by planetary
companions to the hosts. The estimated planet/host separation (scaled
to the angular Einstein radius θE) and mass ratio are (s,
qx103)=(1.81±0.02, 1.24±0.07) and (s,
qx103)=(1.25±0.03, 2.38±0.08), respectively. From Bayesian
analyses, we estimate the host and planet masses as (Mh,
Mp)=(0.25-0.13+0.27, M☉, 0.32-0.17+0.34, MJ) and
(Mh, Mp=(0.54-0.28+0.33, M☉, 1.34-0.70+0.82, MJ),
respectively. These planetary systems are located at a distance of
7.06-1.15+0.93kpc for OGLE-2018-BLG-0567 and 6.50-1.75+1.06kpc
for OGLE-2018-BLG-0962, suggesting that they are likely to be near the
Galactic bulge. The two events prove the capability of current
high-cadence surveys for finding planets through the planetary-caustic
channel. We find that most published planetary-caustic planets are
found in Hollywood events in which the source size strongly
contributes to the anomaly cross-section relative to the size of the
caustic.
Description:
The two planetary events were observed by the two lensing surveys
conducted by the OGLE and KMTNet groups. The OGLE survey uses the 1.3m
telescope that is located at the Las Campanas Observatory in Chile.
The KMTNet survey utilizes three 1.6m telescopes that are located at
the Siding Spring Observatory in Australia (KMTA), the Cerro Tololo
Interamerican Observatory in Chile (KMTC), and the South African
Astronomical Observatory in South Africa (KMTS).
The KMTNet collaboration also observed the event OGLE-2018-BLG-0567,
with designation KMT-2018-BLG-2071, located in their two overlapping
fields (BLG41 and BLG22).
Objects:
---------------------------------------------------------------
RA (2000) DE Designation(s)
---------------------------------------------------------------
17 56 04.42 -27 59 13.6 OGLE-2018-BLG-0567 = EWS 2018-BLG-567
17 52 41.95 -32 18 33.3 OGLE-2018-BLG-0962 = EWS 2018-BLG-962
---------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
fig1.dat 37 9307 Light curves of OGLE-2018-BLG-0567
fig2.dat 39 6925 Light curves of OGLE-2018-BLG-0962
--------------------------------------------------------------------------------
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/A+A/549/A147 : Abundances of microlensed bulge dwarf stars. V. (Bensby+,2013)
J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)
J/ApJ/778/150 : Microlensing events toward the Bulge from MOA-II (Sumi+, 2013)
J/AJ/159/261 : LC of microlensing event OGLE-2012-BLG-0838 (Poleski+, 2020)
Byte-by-byte Description of file: fig1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Tel Survey telescope (KMTnet or OGLE)
6- 6 A1 --- Filt [I/V] Filter observed
8- 18 F11.6 d HJD [7424/8416] Heliocentric Julian date, HJD-2450000.0
20- 28 F9.6 mag omag [16.3/21.4] Observed magnitude in Filter
30- 37 F8.6 mag e_omag [0.007/0.35] Uncertainty in omag
--------------------------------------------------------------------------------
Byte-by-byte Description of file: fig2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- Tel Survey telescope (KMTnet or OGLE)
8- 8 A1 --- Filt [I/V] Filter observed
10- 20 F11.6 d HJD [7435/8417] Heliocentric Julian date, HJD-2450000.0
22- 30 F9.6 mag omag [18/22.9] Observed magnitude in Filter
32- 39 F8.6 mag e_omag [0.01/1.6] Uncertainty in omag
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 07-Jul-2021