J/AJ/163/43 Systematic KMTNet Planetary Anomaly Search. II. (Hwang+, 2022)
Systematic KMTNet Planetary Anomaly Search.
II. Six New q<2x10-4 Mass-ratio Planets
Hwang K.-H., Zang W., Gould A., Udalski A., Bond I.A., Yang H., Mao S.,
Albrow M.D., Chung S.-J., Han C., Kil Jung Y., Ryu Y.-H., Shin I.-G.,
Shvartzvald Y., Yee J.C., 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., Poleski R.,
Skowron J., Szymanski M.K., Soszynski I., Pietrukowicz P., Kozlowski S.,
Ulaczyk K., Rybicki K.A., Iwanek P., Wrona M., Gromadzki M., Abe F., Barry
R., Bennett D.P., Bhattacharya A., Fujii H., Fukui A., Hirao Y., Itow Y.,
Kirikawa R., Kondo I., Koshimoto N., Munford B., Matsubara Y., Miyazaki S.,
Muraki Y., Olmschenk G., Ranc C., Rattenbury N.J., Satoh Y.K., Shoji H.,
Ishitani Silva S., Sumi T., Suzuki D., Tristram P.J., Yonehara A., Zhang X.,
Zhu W., Penny M.T., Fouque P., Lead Authors, KMTNet Collaboration, OGLE
Collaboration, The MOA Collaboration, The Tsinghua & CFHT Microlensing Group
<Astron. J., 163, 43 (2022)>
=2022AJ....163...43H 2022AJ....163...43H
ADC_Keywords: Gravitational lensing; Exoplanets; Photometry, RI
Keywords: Gravitational microlensing exoplanet detection
Abstract:
We apply the automated AnomalyFinder algorithm of Paper I to 2018-2019
light curves from the ∼13deg2 covered by the six KMTNet prime
fields, with cadences Γ≳2/hr. We find a total of 11 planets
with mass ratios q<2x10-4, including 6 newly discovered planets, 1
planet that was reported in Paper I, and recovery of 4 previously
discovered planets. One of the new planets, OGLE-2018-BLG-0977Lb, is
in a planetary caustic event, while the other five
(OGLE-2018-BLG-0506Lb, OGLE-2018-BLG-0516Lb, OGLE-2019-BLG-1492Lb,
KMT-2019-BLG-0253, and KMT-2019-BLG-0953) are revealed by a "dip" in
the light curve as the source crosses the host-planet axis on the
opposite side of the planet. These subtle signals were missed in
previous by-eye searches. The planet-host separations (scaled to the
Einstein radius), s, and planet-host mass ratios, q, are,
respectively, (s,qx105)=(0.88,4.1), (0.96±0.10,8.3),
(0.94±0.07,13), (0.97±0.07,18), (0.97±0.04,4.1), and
(0.74,18), where the "±" indicates a discrete degeneracy. The 11
planets are spread out over the range -5<logq←3.7. Together with the
two planets previously reported with q∼10-5 from the 2018-2019
nonprime KMT fields, this result suggests that planets toward the
bottom of this mass-ratio range may be more common than previously
believed.
Description:
KMTNet observes from three identical 1.6m telescopes, each equipped
with a (2x2deg) camera at CTIO in Chile (KMTC), SAAO in South Africa
(KMTS), and SSO in Australia (KMTA). KMTNet observes primarily in the
I-band, but in 2018 and 2019 every 10th such observation was
complemented by one in the V-band.
Five of the six events were independently discovered by the Optical
Gravitational Lensing Experiment (OGLE), using its 1.3m telescope with
1.4deg2 camera at Las Campanas Observatory in Chile. OGLE also
observed primarily in the I-band, with some V-exposures as well.
Two of the six events were independently discovered by the
Microlensing Observations in Astrophysics (MOA) collaboration, using
their 1.8m telescope with 2.2deg2 camera at Mt. John in New Zealand,
using their RMOA filter, which is roughly the sum of the Cousins R and
I-bands.
Although all six events were alerted in real time, to the best of our
knowledge there were follow-up observations for only one:
OGLE-2018-BLG-0977. These were from the 3.6m Canada-France-Hawaii
Telescope (CFHT) and were at a cadence of about one per night.
Objects:
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RA (2000) DE Designation(s)
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17 51 31.82 -29 33 55.7 KMT-2019-BLG-0253 = EWS 2019-BLG-410
17 50 31.16 -31 55 26.6 OGLE-2018-BLG-0506 = KMT-2018-BLG-0835
17 58 33.63 -31 15 44.6 OGLE-2018-BLG-0516 = KMT-2018-BLG-0808
18 00 23.15 -28 37 52.1 OGLE-2019-BLG-1492 = KMT-2019-BLG-3004
17 54 01.47 -30 36 17.3 OGLE-2018-BLG-0977 = KMT-2018-BLG-0728
17 57 21.26 -28 40 28.7 KMT-2019-BLG-0953 = KMT-2019-BLG-0953
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
f1kmta02.dat 28 1704 KMTA02 I light curve of KMT-2019-BLG-0253
f1kmta42.dat 28 1608 KMTA42 I light curve of KMT-2019-BLG-0253
f1kmtc02.dat 28 2120 KMTC02 I light curve of KMT-2019-BLG-0253
f1kmtc42.dat 28 2015 KMTC42 I light curve of KMT-2019-BLG-0253
f1kmts02.dat 28 1770 KMTS02 I light curve of KMT-2019-BLG-0253
f1kmts42.dat 28 1789 KMTS42 I light curve of KMT-2019-BLG-0253
f1ogle.dat 23 14330 OGLE I light curve of KMT-2019-BLG-0253
f1moa.dat 34 2031 MOA R light curve of KMT-2019-BLG-0253
f3kmta01.dat 28 495 KMTA01 I light curve of OGLE-2018-BLG-0506
f3kmta41.dat 28 543 KMTA41 I light curve of OGLE-2018-BLG-0506
f3kmtc01.dat 28 381 KMTC01 I light curve of OGLE-2018-BLG-0506
f3kmtc41.dat 28 511 KMTC41 I light curve of OGLE-2018-BLG-0506
f3kmts01.dat 28 169 KMTS01 I light curve of OGLE-2018-BLG-0506
f3kmts41.dat 28 672 KMTS41 I light curve of OGLE-2018-BLG-0506
f3ogle.dat 23 2705 OGLE I light curve of OGLE-2018-BLG-0506
f4kmta01.dat 28 1057 KMTA01 I light curve of OGLE-2018-BLG-0516
f4kmtc01.dat 28 2009 KMTC01 I light curve of OGLE-2018-BLG-0516
f4kmts01.dat 28 1011 KMTS01 I light curve of OGLE-2018-BLG-0516
f4ogle.dat 23 2507 OGLE I light curve of OGLE-2018-BLG-0516
f4moa.dat 34 698 MOA R light curve of OGLE-2018-BLG-0516
f5kmta03.dat 28 773 KMTA03 I light curve of OGLE-2019-BLG-1492
f5kmta43.dat 28 755 KMTA43 I light curve of OGLE-2019-BLG-1492
f5kmtc03.dat 28 797 KMTC03 I light curve of OGLE-2019-BLG-1492
f5kmtc43.dat 28 741 KMTC43 I light curve of OGLE-2019-BLG-1492
f5kmts03.dat 28 744 KMTS03 I light curve of OGLE-2019-BLG-1492
f5kmts43.dat 28 709 KMTS43 I light curve of OGLE-2019-BLG-1492
f5ogle.dat 23 14266 OGLE I light curve of OGLE-2019-BLG-1492
f5moa.dat 34 692 MOA R light curve of OGLE-2019-BLG-1492
f6kmta01.dat 28 217 KMTA01 I light curve of OGLE-2018-BLG-0977
f6kmtc01.dat 28 425 KMTC01 I light curve of OGLE-2018-BLG-0977
f6kmts01.dat 28 179 KMTS01 I light curve of OGLE-2018-BLG-0977
f6ogle.dat 23 7371 OGLE I light curve of OGLE-2018-BLG-0977
cfht.dat 26 36 CFHT I light curve of OGLE-2018-BLG-0977
f7kmta02.dat 28 2086 KMTA02 I light curve of KMT-2019-BLG-0953
f7kmta03.dat 28 2076 KMTA03 I light curve of KMT-2019-BLG-0953
f7kmta42.dat 28 2100 KMTA42 I light curve of KMT-2019-BLG-0953
f7kmta43.dat 28 2047 KMTA43 I light curve of KMT-2019-BLG-0953
f7kmtc02.dat 28 2325 KMTC02 I light curve of KMT-2019-BLG-0953
f7kmtc03.dat 28 2277 KMTC03 I light curve of KMT-2019-BLG-0953
f7kmtc42.dat 28 2230 KMTC42 I light curve of KMT-2019-BLG-0953
f7kmtc43.dat 28 2187 KMTC43 I light curve of KMT-2019-BLG-0953
f7kmts02.dat 28 2127 KMTS02 I light curve of KMT-2019-BLG-0953
f7kmts03.dat 28 1955 KMTS03 I light curve of KMT-2019-BLG-0953
f7kmts42.dat 28 2104 KMTS42 I light curve of KMT-2019-BLG-0953
f7ogle.dat 23 16726 OGLE I light curve of KMT-2019-BLG-0953
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See also:
J/A+A/529/A102 : MOA-2007-BLG-387Lb light curve I band (Batista+, 2011)
J/A+A/549/A147 : Abundances microlensed bulge dwarf stars. V. (Bensby+, 2013)
J/AJ/160/148 : RI LC of microlensing event OGLE-2018-BLG-1269Lb (Jung+, 2020)
J/AJ/160/255 : KMTNet & OGLE I photometry of KMT-2019-BLG-0842 (Jung+, 2020)
J/AJ/161/270 : OGLE, MOA & KMTNet light curve KMT-2019-BLG-1715 (Han+, 2021)
J/AJ/161/293 : LCs of OGLE-2018-BLG-0567 and OGLE-2018-BLG-0962 (Jung+, 2021)
J/AJ/162/17 : KMTNet, MOA & OGLE light curve KMT-2019-BLG-0371 (Kim+, 2021)
J/AJ/162/163 : Systematic KMTNet Planetary Anomaly Search. I. (Zang+, 2021)
Byte-by-byte Description of file: f[134567]kmt[acs][04][123].dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d HJD Heliocentric Julian Date of Observation, HJD-2450000
13- 20 F8.5 mag omag ? Observed magnitude in filter
22- 28 F7.5 mag e_omag ? Uncertainty in omag
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Byte-by-byte Description of file: f[134567]ogle.dat
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Bytes Format Units Label Explanations
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1- 10 F10.5 d HJD Heliocentric Julian Date of Observation, HJD-2450000
12- 17 F6.3 mag omag Observed magnitude in filter
19- 23 F5.3 mag e_omag Uncertainty in omag
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Byte-by-byte Description of file: f[145]moa.dat
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Bytes Format Units Label Explanations
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1- 13 F13.8 d HJD Heliocentric Julian Date of Observation, HJD-2450000
15- 24 F10.4 mag omag Observed magnitude in filter
26- 34 F9.4 mag e_omag Uncertainty in omag
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Byte-by-byte Description of file: cfht.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d HJD Heliocentric Julian Date of Observation, HJD-2450000
13- 19 F7.4 mag omag Observed magnitude in filter
21- 26 F6.4 mag e_omag Uncertainty in omag
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History:
From electronic version of the journal
References:
Zang et al. Paper I : 2021AJ....162..163Z 2021AJ....162..163Z Cat. J/AJ/162/163
(End) Prepared by [AAS], Coralie Fix [CDS], 04-May-2022