J/AJ/162/163 Systematic KMTNet Planetary Anomaly Search. I. (Zang+, 2021)
Systematic KMTNet Planetary Anomaly Search.
I. OGLE-2019-BLG-1053Lb, a Buried Terrestrial Planet.
Zang W., Hwang K.-H., Udalski A., Wang T., Zhu W., Sumi T., Yee J.C.,
Gould A., Mao S., Zhang X., Albrow M.D., Chung S.-J., Han C., Jung Y.K.,
Ryu Y.-H., Shin I.-G., Shvartzvald Y., 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.,
Skowron J., Poleski R., Szymanski M.K., Soszynski I., Pietrukowicz P.,
Kozlowski S., Ulaczyk K., Rybicki K.A., Iwanek P., Wrona M., Gromadzki M.,
Bond I.A., Abe F., Barry R., Bennett D.P., Bhattacharya A., Donachie M.,
Fujii H., Fukui A., Hirao Y., Itow Y., Kirikawa R., Kondo I., Koshimoto N.,
Li M.C.A., Matsubara Y., Muraki Y., Miyazaki S., Olmschenk G., Ranc C.,
Rattenbury N.J., Satoh Y., Shoji H., Ishitani Silva S., Suzuki D.,
Tanaka Y., Tristram P.J., Yamawaki T., Yonehara A., Beichman C.A.,
Bryden G., Calchi Novati S., Carey S., Gaudi B.S., Henderson C.B.,
Johnson S.
<Astron. J., 162, 163 (2021)>
=2021AJ....162..163Z 2021AJ....162..163Z
ADC_Keywords: Exoplanets; Gravitational lensing; Photometry, infrared
Keywords: Exoplanet detection methods ;
Gravitational microlensing exoplanet detection
Abstract:
In order to exhume the buried signatures of "missing planetary
caustics" in Korea Microlensing Telescope Network (KMTNet) data, we
conducted a systematic anomaly search of the residuals from
point-source point-lens fits, based on a modified version of the
KMTNet EventFinder algorithm. This search revealed the
lowest-mass-ratio planetary caustic to date in the microlensing event
OGLE-2019-BLG-1053, for which the planetary signal had not been
noticed before. The planetary system has a planet-host mass ratio of
q=(1.25±0.13)x10-5. A Bayesian analysis yielded estimates of the
mass of the host star, Mhost=0.61-0.24+0.29M☉, the mass of
its planet, Mplanet=2.48-0.98+1.19M⊕, the projected
planet-host separation, aperp=3.4-0.5+0.5au, and the lens
distance, DL=6.8-0.9+0.6kpc. The discovery of this
very-low-mass-ratio planet illustrates the utility of our method and
opens a new window for a large and homogeneous sample to study the
microlensing planet-host mass ratio function down to q∼10-5.
Description:
On 2019 July 5, OGLE-2019-BLG-1053 was announced as a microlensing
candidate event by the OGLE Early Warning System. It was then
independently discovered by the KMT alert-finder system and was
announced as a clear microlensing candidate KMT-2019-BLG-1504 on 2019
July 7.
The OGLE observations were carried out using the 1.3m Warsaw Telescope
equipped with a 1.4 deg2 field-of-view mosaic CCD camera at the Las
Campanas Observatory in Chile. The event lies in the OGLE BLG511
field. The event lies in two slightly offset KMT fields, BLG03 and
BLG43.
For both surveys, most images were taken in the I band. This event was
also observed by the Spitzer Space Telescope.
Objects:
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RA (2000) DE Designation(s)
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18 00 39.93 -27 20 29.7 OGLE-2019-BLG-1053 = EWS 2019-BLG-1053
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
kmta03i.dat 53 2433 KMTA I band light curve of BLG03 field
kmta43i.dat 53 2409 KMTA I band light curve of BLG43 field
kmtc03i.dat 53 2599 KMTC I band light curve of BLG03 field
kmtc43i.dat 53 2460 KMTC I band light curve of BLG43 field
kmts03i.dat 53 2451 KMTS I band light curve of BLG03 field
kmts43i.dat 53 2406 KMTS I band light curve of BLG43 field
oglei.dat 26 8224 OGLE I band light curve
fig7.dat 29 22 Observed Spitzer data in instrumental-flux units
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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/529/A102 : MOA-2007-BLG-387Lb light curve I band (Batista+, 2011)
J/other/Nat/481.167 : 2002-2007 PLANET microlensing events (Assan+, 2012)
J/A+A/549/A147 : Abundances of microlensed bulge dwarf stars. V. (Bensby+,2013)
J/ApJ/783/130 : Parallaxes of high mass star forming regions (Reid+, 2014)
J/ApJ/814/92 : Spitzer IRAC events observed in crowded fields (Calchi+, 2015)
J/MNRAS/457/4089 : Frequency of snowline-region planets (Shvartzvald+, 2016)
J/A+A/605/A89 : Abundances microlensed Bulge dwarf stars. VI. (Bensby+, 2017)
J/AJ/154/210 : 2015 high-cadence Spitzer microlensing events (Zhu+, 2017)
J/AJ/160/74 : Optical and IR photometry of OGLE-2017-BLG-0406 (Hirao+, 2020)
J/AJ/160/255 : KMTNet & OGLE I-band photo. of KMT-2019-BLG-0842 (Jung+, 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)
J/AJ/162/17 : KMTNet, MOA, OGLE light curve of KMT-2019-BLG-0371 (Kim+, 2021)
Byte-by-byte Description of file: kmt[acs][04]3i.dat
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Bytes Format Units Label Explanations
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1- 10 F10.5 d HJD Heliocentric Julian Date, HJD-2450000
12- 24 F13.4 --- flux Delta flux
26- 36 F11.4 --- e_flux Uncertainty in flux
38- 42 F5.2 arcsec FWHM Seeing full width at half maximum
44- 48 I5 ct/s Sky Sky brightness
50- 53 F4.2 --- AMass Airmass
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Byte-by-byte Description of file: oglei.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD [2455260/2458788] Heliocentric Julian Date
15- 20 F6.3 mag Imag [17.9/18.8] Apparent I band magnitude (1)
22- 26 F5.3 mag e_Imag [0.01/0.2] Uncertainty in Imag
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Note (1): The I band magnitude is the instrumental magnitude but the difference
to the standard I-band magnitude is within 0.2mag
Udalski+, 2015AcA....65....1U 2015AcA....65....1U.
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Byte-by-byte Description of file: fig7.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d HJD [8685/8712] Heliocentric Julian Date, HJD-2450000
13- 19 F7.5 --- flux [1.95/4.61] Spitzer/IRAC 3.6micron instrumental flux
21- 29 F9.7 --- e_flux [0.08/0.1] Uncertainty in flux
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 17-Dec-2021