J/AJ/163/176 Prediction of microlensing events with Gaia EDR3 (Kluter+, 2022)
Prediction of Astrometric-microlensing Events from Gaia EDR3 Proper Motions.
Kluter J., Bastian U., Demleitner M., Wambsganss J.
<Astron. J., 163, 176 (2022)>
=2022AJ....163..176K 2022AJ....163..176K
ADC_Keywords: Gravitational lensing; Positional data; Proper motions;
Parallaxes, trigonometric
Keywords: Astrometry ; Proper motions ; Catalogs ; Astrometric
microlensing effect ; Stellar masses ; White dwarf stars
Abstract:
Astrometric microlensing is a unique tool to measure stellar masses.
It allows us to determine the mass of the lensing star with an
accuracy of a few percent. In this paper, we update, extend, and
refine our predictions of astrometric-microlensing events based on
Gaia's early Data release 3 (EDR3). We selected about 500.000
high-proper-motion stars from Gaia EDR3 with µtot>100mas/yr and
searched for background sources close to their paths. We applied
various selection criteria and cuts in order to exclude spurious
sources and co-moving stars. By forecasting the future positions of
lens and source, we determined epoch of and angular separation at
closest approach, and determined an expected positional shift and
magnification. Using Gaia EDR3, we predict 1758 new microlensing
events with expected shifts larger than 0.1mas between the epochs
J2010.5 and mid J2066.0. Further, we provide more precise information
on the angular separation at closest approach for 3084 previously
predicted events. This helps to select better targets for
observations, especially for events that occur within the next decade.
Our search lead to the new prediction of an interesting
astrometric-microlensing event by the white dwarf Gaia
EDR3-4053455379420641152. In 2025 it will pass by a G=20.25mag star,
which will lead to a positional shift of the major image of
δθ+=1.2-0.5+2.0mas. Since the background source is
only ΔG=2.45mag fainter than the lens, also the shift of the
combined center of light will be measurable, especially using a
near-infrared filter, where the background star is brighter than the
lens (ΔKs=-1.1mag).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 687 4842 Prediction of microlensing events based on
Gaia EDR3
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See also:
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
II/364 : VIRAC. The VVV Infrared Astrometric Catalogue (Smith+, 2019)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)
J/A+A/618/A44 : Predicted microlensing events from Gaia DR2 (Bramich, 2018)
J/AcA/68/183 : Predicted Microlensing Events 21st Century (Bramich+, 2018)
J/A+A/617/A135 : 20 years of photometric microlensing (Mustill+, 2018)
J/AcA/68/351 : Predicted Microlensing Events by nearby VLM (Nielsen+ 2018)
J/A+A/649/A6 : Gaia Catalogue of Nearby Stars GCNS (Gaia collaboration, 2021)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 25 A25 --- Event Unique event identifier (1)
27- 45 I19 --- Lens Gaia EDR3 lens identifier
47- 60 F14.10 deg RAdeg [0/360] Gaia EDR3 lens Right Ascension
(J2016.0)
62- 75 F14.10 deg DEdeg [-89/89] Gaia EDR3 lens Declination
(J2016.0)
77- 82 F6.4 mas e_RAdeg [0.004/2] Uncertainty in RAdeg
84- 89 F6.4 mas e_DEdeg [0.006/1] Uncertainty in DEdeg
91-100 F10.4 mas/yr pmRA [-4407/6492] Gaia EDR3 lens proper motion
in RA
102-111 F10.4 mas/yr pmDE [-5818/10363] Gaia EDR3 lens proper motion
in DE
113-118 F6.4 mas/yr e_pmRA [0.005/2] Uncertainty in pmRA
120-125 F6.4 mas/yr e_pmDE [0.008/2] Uncertainty in pmDE
127-134 F8.4 mas plx [0.76/769] Gaia EDR3 lens parallax
136-141 F6.4 mas e_plx [0.008/2] Uncertainty in plx
143-150 F8.5 mag Gmag [3.69/20.9] Gaia EDR3 lens mean G band mag
152-159 F8.5 mag Rpmag [3.29/20.1]? Gaia EDR3 lens mean RP mag
161-168 F8.5 mag Bpmag [3.99/22.5]? Gaia EDR3 lens mean BP mag
170-188 I19 --- Obj Gaia EDR3 lensed object identifier
190-203 F14.10 deg ORAdeg [0/360] Gaia EDR3 lensed object Right
Ascension (J2016.0)
205-218 F14.10 deg ODEdeg [-89/89] Gaia EDR3 lensed object
Declination (J2016.0)
220-225 F6.4 mas e_ORAdeg [0.005/10] Uncertainty in ORAdeg
227-232 F6.4 mas e_ODEdeg [0.007/9] Uncertainty in ODEdeg
234-241 F8.4 mas/yr OpmRA [-38.4/71.7]? Gaia EDR3 lensed object
proper motion in RA
243-251 F9.4 mas/yr OpmDE [-102/40.5]? Gaia EDR3 lensed object
proper motion in DE
253-258 F6.4 mas/yr e_OpmRA [0.008/4]? Uncertainty in OpmRA
260-265 F6.4 mas/yr e_OpmDE [0.009/4]? Uncertainty in OpmDE
267-273 F7.4 mas Oplx [-6.1/9.1]? Gaia EDR3 lensed parallax
275-280 F6.4 mas e_Oplx [0.008/3]? Uncertainty in Oplx
282-288 F7.4 mag OGmag [10.4/21.3] Gaia EDR3 lensed object mean G
band magnitude
290-296 F7.4 mag ORpmag [9.72/21.6]? Gaia EDR3 lensed object mean
RP band magnitude
298-304 F7.4 mag OBpmag [11/23.3]? Gaia EDR3 lensed object mean BP
band magnitude
306-313 F8.4 mas DisRA [-99.6/141]? Doubled displacement in RA
between DR2 & EDR3 (2)
315-323 F9.4 mas DisDE [-101/114]? Doubled displacement in DE
between DR2 & EDR3
325-326 A2 --- Type Lensing star type (3)
328-332 F5.3 solMass Mass [0.07/1.63] Gaia EDR3 estimated lens mass
334-338 F5.3 solMass e_Mass [0.01/0.5] Uncertainty in Mass
340-344 F5.2 mas theta [1.1/39.2] Event Einstein radius
346-349 F4.2 mas e_theta [0.1/5] Uncertainty in theta
351-357 F7.4 yr tAml [0.06/37.8]? Approx. duration of event (4)
359-366 F8.5 yr t01mas [0.002/92.9]? Approximate duration (5)
368-375 F8.5 yr t50pc [0.002/11.8] Approximate duration (6)
377-385 F9.4 yr tca [2010/2070] Estim. time of closest approach
387-392 F6.4 yr e_tca [0.0001/5.2]? Uncertainty in tca
394-400 F7.2 mas dist [0/7041] Estim. distance closest approach
402-408 F7.2 mas e_dist [0.1/1300] Uncertainty in dist
410-415 F6.2 --- u [0/253] Estimated distance at closest
approach in units of Einstein radii
417-422 F6.2 --- B_u [0.12/360] Upper 67% confidence interval u
424-430 F7.2 --- b_u [-340/-0.12] Lower 67% confidence interval
in u
432-437 F6.4 mas shift [0.04/9.71] Maximal astrometric shift of
center of light
439-444 F6.4 mas B_shift [0.01/6.17] Upper 67% confidence interval
in shift
446-452 F7.4 mas b_shift [-3.84/-0.009] Lower 67% confidence
interval in shift
454-461 E8.2 mas shiftLum [6.37e-08/2.04] Max astrometric shift (7)
463-469 E7.1 mas B_shiftLum [7.5e-09/1.5] Upper 67% confidence interval
in shiftLum
471-478 E8.1 mas b_shiftLum [-0.82/-6.6e-09] Lower 67% confidence
interval in shiftLum
480-486 F7.4 mas shift+ [0.1/16.7] Maximal astrometric shift of
brighter image
488-495 F8.4 mas B_shift+ [0.01/918] Upper 67% confidence interval
in shift+
497-504 F8.4 mas b_shift+ [-10/-0.009] Lower 67% confidence interval
in shift+
506-513 E8.2 mag Magnif [0/0.68] Maximal magnification
515-522 E8.1 mag B_Magnif [-2e-31/1.2] Upper 67% confidence interval
in Magnif
524-531 E8.1 mag b_Magnif [-0.46/0] Lower 67% confidence interval in
Magnif
533-541 F9.4 yr L2tca [2010/2070] Estimated time of closest
approach from L2
543-549 E7.1 yr e_L2tca [3.9e-05/5.3] Uncertainty in L2tca
551-557 F7.2 mas L2dist [0/7044] Estimated distance at closest
approach from L2
559-565 F7.2 mas e_L2dist [0.13/1300] Uncertainty in L2dist
567-572 F6.2 --- L2u [0/253] Estimated distance at closest
approach units of Einstein radii from L2
574-579 F6.2 --- B_L2u [0.12/350] Upper 67% confidence interval
in L2u
581-587 F7.2 --- b_L2u [-340/-0.11] Lower 67% confidence interval
in L2u
589-594 F6.4 mas L2shift [0.04/9.68] Maximal astrometric shift of
the center of light from L2
596-601 F6.4 mas B_L2shift [0.01/6.49] Upper 67% confidence interval
in L2shift
603-609 F7.4 mas b_L2shift [-3.83/-0.009] Lower 67% confidence
interval in L2shift
611-618 E8.2 mas L2shiftLum [6.37e-08/2.04] Maximal astrometric shift
including lens-luminosity effect from L2
620-626 E7.1 mas B_L2shiftLum [7.5e-09/1.5] Upper 67% confidence interval
in L2shiftLum
628-635 E8.1 mas b_L2shiftLum [-0.83/-6.6e-09] Lower 67% confidence
interval in L2shiftLum
637-643 F7.4 mas L2shift+ [0.1/16.5] Maximal astrometric shift of
brighter image from L2
645-652 F8.4 mas B_L2shift+ [0.01/885] Upper 67% confidence interval
in L2shift+
654-661 F8.4 mas b_L2shift+ [-10/-0.009] Lower 67% confidence interval
in L2shift+
663-670 E8.2 mag L2magnif [0/0.7] Maximal magnifications from L2
672-678 E7.1 mag B_L2magnif [0/1.2] Upper 67% confidence interval in
L2magnif
680-687 E8.1 mag b_L2magnif [-0.48/0] Lower 67% confidence interval in
L2magnif
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Note (1): This is the decimal representation of the Gaia EDR3 source id of the
lens, and a disambiguator for the lensed object.
Note (2): cos(DE) applied.
Note (3): Types as follows:
WD = White Dwarf;
MS = Main Sequence;
RG = Red Giant;
BD = Brown Dwarf.
Note (4): i.e., shift~>0.1mas.
Note (5): On which shift plus changes by 0.1 mas from its maximum
(abs(shift+vector(tca)-shift+vector(tca-t01mas))=0.1 mas).
Note (6): On which shift* changes by 50% from its maximum
(abs(shift+vector(tca)-shift+vector(tca-t_50pc))=50%*shift*).
Note (7): Including lens-luminosity effects.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 29-Apr-2022