J/A+A/618/A44 Predicted microlensing events from Gaia DR2 (Bramich, 2018)
Predicted microlensing events from analysis of Gaia Data Release 2.
Bramich D.M.
<Astron. Astrophys. 618, A44 (2018)>
=2018A&A...618A..44B 2018A&A...618A..44B (SIMBAD/NED BibCode)
ADC_Keywords: Gravitational lensing ; Positional data ; Stars, nearby
Keywords: gravitational lensing: micro - methods: data analysis -
catalogs - astrometry - stars: fundamental parameters
Abstract:
I search for source-lens pairs in Gaia Data Release 2 (GDR2, Cat.
I/345) that could potentially lead to microlensing events between 25th
July 2014 and 25th July 2026. I estimate the lens masses using GDR2
photometry and parallaxes, and appropriate model stellar isochrones.
Combined with the source and lens parallax measurements from GDR2,
this allows the Einstein ring radius to be computed for each
source-lens pair. By considering the source and lens paths on the sky,
I calculate the microlensing signals that are to be expected.
Description:
Characteristics of the 43 astrometric microlensing events ME34-ME76.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea7.dat 460 43 Characteristics of the microlensing events ME34-ME76
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
Byte-by-byte Description of file: tablea7.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Event Event name
6- 10 A5 --- LensSpType Lens spectral type
12- 30 A19 --- LensID Lens GDR2 ID
32- 45 F14.10 deg RALdeg Lens right ascension (ICRS, at Ep=2015.5)
48- 54 F7.4 mas e_RALdeg Error on lens right ascension
56- 69 F14.10 deg DELdeg Lens declination (ICRS, at Ep=2015.5)
72- 78 F7.4 mas e_DELdeg Error on lens declination
80- 88 F9.3 mas/yr LenspmRA Lens proper motion in right ascension
90- 94 F5.3 mas/yr e_LenspmRA Error on lens proper motion in
right ascension
96-103 F8.3 mas/yr LenspmDE Lens proper motion in declination
105-109 F5.3 mas/yr e_LenspmDE Error on lens proper motion in declination
111-117 F7.3 mas Lensplx Lens parallax
119-123 F5.3 mas e_Lensplx Error on lens parallax
125-132 F8.4 mag LensGmag Lens G mean magnitude
134-139 F6.4 mag e_LensGmag Error on lens G mean magnitude
141-147 F7.4 mag LensBPmag Lens G_BP mean magnitude
149-154 F6.4 mag e_LensBPmag Error on lens G_BP mean magnitude
156-162 F7.4 mag LensRPmag Lens G_RP mean magnitude
164-169 F6.4 mag e_LensRPmag Error on lens G_RP mean magnitude
171-174 F4.2 Msun LensMass Lens mass
176-194 I19 --- Source Source GDR2 ID
196-209 F14.10 deg RAdeg Source right ascension (ICRS, at Ep=2015.5)
211-216 F6.3 mas e_RAdeg Error on source right ascension
218-231 F14.10 deg DEdeg Source declination (ICRS, at Ep=2015.5)
233-238 F6.3 mas e_DEdeg Error on source declination
240-246 F7.3 mas/yr pmRA ? Source proper motion in right ascension
248-252 F5.3 mas/yr e_pmRA ? Error on source proper motion in
right ascension
254-260 F7.3 mas/yr pmDE ? Source proper motion in declination
262-266 F5.3 mas/yr e_pmDE ? Error on source proper motion in
declination
268-273 F6.3 mas plx ? Source parallax
275-279 F5.3 mas e_plx ? Error on source parallax
281-287 F7.4 mag Gmag ? Source G mean magnitude
289-294 F6.4 mag e_Gmag ? Error on source G mean magnitude
296-302 F7.4 mag BPmag ? Source G_BP mean magnitude
304-309 F6.4 mag e_BPmag ? Error on source G_BP mean magnitude
311-317 F7.4 mag RPmag ? Source G_RP mean magnitude
319-324 F6.4 mag e_RPmag ? Error on source G_RP mean magnitude
326-331 F6.3 mas thetaE Einstein radius theta_E
333-337 F5.3 mas e_thetaE Error on Einstein radius
339-344 F6.2 --- u0t Minimum normalised source-lens separation
u_0 in theta_E units
346-351 F6.2 --- b_u0t 15.9 percentile of the minimum normalised
source-lens separation u_0
in theta_E units
353-358 F6.2 --- B_u0t 84.1 percentile of the minimum normalised
source-lens separation u_0
in theta_E units
360-366 F7.2 mas u0 Minimum source-lens separation u_0
368-374 F7.2 mas b_u0 15.9 percentile of the minimum
source-lens separation u_0
376-382 F7.2 mas B_u0 84.1 percentile of the minimum
source-lens separation u_0
384-393 F10.5 yr t0 Epoch of the event peak t_0 in Julian year
394-396 A3 --- n_t0 [(ab) ] Note on t0 (1)
398-407 F10.5 yr b_t0 15.9 percentile of the epoch of the event
peak t_0 in Julian year
409-418 F10.5 yr B_t0 84.1 percentile of the epoch of the event
peak t_0 in Julian year
420-424 F5.3 mas dtheta2 Difference between the minimum and maximum
astrometric shifts of an event over the
12-year baseline of an extended
Gaia mission
426-430 F5.3 mas b_dtheta2 15.9 percentile of the difference between
the minimum and maximum astrometric shifts
of an event over the 12-year baseline of
an extended Gaia mission
432-436 F5.3 mas B_dtheta2 84.1 percentile of the difference between
the minimum and maximum astrometric shifts
of an event over the 12-year baseline of
an extended Gaia mission
438-444 F7.2 d Tdtheta2 Amount of time that an event spends with
its astrometric shift above halfway
between the minimum and maximum shift
446-452 F7.2 d b_Tdtheta2 15.9 percentile of the amount of time that
an event spends with its astrometric
shift above halfway between the minimum
and maximum shift
454-460 F7.2 d B_Tdtheta2 84.1 percentile of the amount of time that
an event spends with its astrometric
shift above halfway between the minimum
and maximum shift
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Note (1): Note as follows:
(a) = Event peaks before this date and the event properties are only
computed using the time period considered in this paper.
(b) = Event peaks after this date. For event properties computed from a
more appropriate time period, see Bramich & Nielsen (2018).
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Acknowledgements:
Dan Bramich, dan.bramich(at)hotmail.co.uk
(End) Dan Bramich [NYUAD, UAE], Patricia Vannier [CDS] 10-Jul-2018