J/AJ/160/255 KMTNet & OGLE I-band photometry of KMT-2019-BLG-0842 (Jung+, 2020)
KMT-2019-BLG-0842Lb: a cold planet below the Uranus/Sun mass ratio.
Jung Y.K., Udalski A., Zang W., Bond I.A., Yee J.C., Han C., Albrow M.D.,
Chung S.-J., Gould A., Hwang K.-H., 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., 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., Bhattacharya A.,
Donachie M., Fujii H., Fukui A., Hirao Y., Itow Y., Kamei Y., Kondo I.,
Koshimoto N., Li M.C.A., Matsubara Y., Miyazaki S., Muraki Y., Nagakane M.,
Ranc C., Rattenbury N.J., Satoh Y., Shoji H., Suematsu H., Sullivan D.J.,
Sumi T., Suzuki D., Tristram P.J., Yamakawa T., Yamamwaki T., Yonehara A.
<Astron. J., 160, 255 (2020)>
=2020AJ....160..255J 2020AJ....160..255J
ADC_Keywords: Exoplanets; Gravitational lensing; Photometry, RI
Keywords: Gravitational microlensing ;
Gravitational microlensing exoplanet detection
Abstract:
We report the discovery of a cold planet with a very low planet/host
mass ratio of q=(4.09±0.27)x10-5, which is similar to the ratio
of Uranus/Sun (q=4.37x10-5) in the solar system. The Bayesian
estimates for the host mass, planet mass, system distance, and
planet-host projected separation are Mhost=0.76±0.40M☉,
Mplanet=10.3±5.5M⊕, DL=3.3±1.3kpc, and
a⊥=3.3±1.4 au, respectively. The consistency of the color and
brightness expected from the estimated lens mass and distance with
those of the blend suggests the possibility that the most blended
light comes from the planet host, and this hypothesis can be
established if high-resolution images are taken during the next (2020)
bulge season. We discuss the importance of conducting optimized
photometry and aggressive follow-up observations for moderately or
very high magnification events to maximize the detection rate of
planets with very low mass ratios.
Description:
Observations by the KMTNet survey were conducted utilizing three
identical 1.6m telescopes, located at Cerro Tololo InterAmerican
Observatory (KMTC), the South African Astronomical Observatory (KMTS),
and the Siding Springs Observatory (KMTA). KMT-2019-BLG-0842 lies in
the overlapping KMT fields BLG02 and BLG42.
The Optical Gravitational Lensing Experiment (OGLE) collaboration
observed the event, located in their BLG501 field, using the 1.3m
telescope, located at Las Campanas Observatory in Chile.
Observations were conducted in the I-band.
Objects:
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RA (2000) DE Designation(s)
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17 53 50.03 -29 52 38.8 KMT-2019-BLG-0842 = KMT-2019-BLG-0842
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig1.dat 37 10339 Light curve of KMT-2019-BLG-0842
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See also:
J/AcA/50/421 : OGLE-II DIA BUL_SC1 field (Wozniak, 2000)
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/A+A/617/A135 : 20 years of photometric microlensing (Mustill+, 2018)
J/AJ/155/186 : The KMTNet/K2-C9 (Kepler) Data Release (Kim+, 2018)
J/AJ/159/98 : I-band LC of microlensing event KMT-2016-BLG-1836 (Yang+,2020)
Byte-by-byte Description of file: fig1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Inst Instrument used
8- 18 F11.6 d HJD [7424/8726] Heliocentric Julian Date; JD-2450000
20- 28 F9.6 mag Imag [15.9/20.4] Apparent I band magnitude
30- 37 F8.6 mag e_Imag [0.007/0.29] Uncertainty in Imag
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 03-Feb-2021