J/AJ/162/96 I-band light curve of KMT-2016-BLG-2605 with KMTNet (Ryu+, 2021)
Shortest Microlensing Event with a Bound Planet: KMT-2016-BLG-2605.
Ryu Y.-H., Hwang K.-H., Gould A., Yee J.C., Albrow M.D., Chung S.-J.,
Han C., Jung Y.K., Kim H.-W., Shin I.-G., Shvartzvald Y., Zang W.,
Cha S.-M., Kim D.-J., Kim S.-L., Lee C.-U., Lee D.-J., Lee Y., Park B.-G.,
Pogge R.W.
<Astron. J., 162, 96 (2021)>
=2021AJ....162...96R 2021AJ....162...96R
ADC_Keywords: Gravitational lensing; Photometry, RI; Exoplanets
Keywords: Gravitational microlensing ;
Gravitational microlensing exoplanet detection
Abstract:
With a planet-host mass ratio q=0.012±0.001, KMT-2016-BLG-2605 has
the shortest Einstein timescale, tE=3.41±0.13days, of any
planetary microlensing event to date. This prompts us to examine the
full sample of seven short (tE<7days) planetary events with good q
measurements. We find that six have clustered Einstein radii
θE=115±20µas and lens-source relative proper motions
µrel∼9.5±2.5mas/yr. For the seventh, these two quantities could
not be measured. These distributions are consistent with a Galactic
bulge population of very low mass (VLM) hosts near the
hydrogen-burning limit. This conjecture could be verified by imaging
at first adaptive optics light on next-generation (30m) telescopes.
Based on a preliminary assessment of the sample, "planetary"
companions (i.e., below the deuterium-burning limit) are divided into
"genuine planets," formed in their disks by core accretion, and VLM
brown dwarfs, which form like stars. We discuss techniques for
expanding the sample, which include taking account of the peculiar
"anomaly-dominated" morphology of the KMT-2016-BLG-2605 light curve.
Description:
The Korea Microlensing Telescope Network (KMTNet) consists of three
1.6m telescopes, each equipped with a 4deg2 camera and located in
Chile (KMTC), South Africa (KMTS), and Australia (KMTA). At the time
of the event, BLG03 (where KMT-2016-BLG-2605 lies) was observed with a
cadence Γ=2/hr from each observatory in the I band.
Objects:
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RA (2000) DE Designation(s)
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17 59 17.54 -26 58 55.2 KMT-2016-BLG-2605 = KMT-2016-BLG-2605
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig4.dat 35 3611 Light curve for KMT-2016-BLG-2605
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See also:
II/348 : VISTA Variable in the Via Lactea Survey DR2 (Minniti+, 2017)
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/216/7 : Planets Around Low-Mass Stars (PALMS). IV. (Bowler+, 2015)
J/A+A/605/A89 : Abundances microlensed Bulge dwarf stars. VI. (Bensby+, 2017)
J/AJ/159/116 : I-band light curves of OGLE-2015-BLG-1771Lb (Zhang+, 2020)
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/161/126 : I-band LC of microlensing event KMT-2017-BLG-2820 (Ryu+, 2021)
Byte-by-byte Description of file: fig4.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Obs KMT observatory (1)
6- 16 F11.6 d HJD [7439/7682] Heliocentric Julian Date; HJD-2450000
18- 26 F9.6 mag Imag [16.3/19.4] Apparent I band magnitude
28- 35 F8.6 mag e_Imag [0.005/1.5] Uncertainty in Imag
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Note (1): Observatories as follows:
CTIO = Cerro Tololo Inter-American Observatory, Chile (KMTC; 1307 occurrences)
SAAO = South African Astronomical Observatory (KMTS; 1463 occurrences)
SSO = Siding Spring Observatory, Australia (KMTA; 841 occurrences)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 30-Nov-2021