2018A&A...617A.135M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST03:33:55

2018A&A...617A.135M - Astronomy and Astrophysics, volume 617A, 135-135 (2018/9-1)

Twenty years of photometric microlensing events predicted by Gaia DR2. Potential planet-hosting lenses within 100 pc.

MUSTILL A.J., DAVIES M.B. and LINDEGREN L.

Abstract (from CDS):


Context.Gaia Data Release 2 (DR2) offers unparalleled precision on stars' parallaxes and proper motions. This allows the prediction of microlensing events for which the lens stars (and any planets they possess) are nearby and may be well studied and characterised.
Aims. We identify a number of potential microlensing events that will occur before the year 2035.5, 20 years from the Gaia DR2 reference epoch.
Methods. We query Gaia DR2 for potential lenses within 100pc, extract parallaxes and proper motions of the lenses and background sources, and identify potential lensing events. We estimate the lens masses from Priam effective temperatures and use these to calculate peak magnifications and the size of the Einstein radii relative to the lens stars' habitable zones.
Results. We identify seven future events with a probability >10% of an alignment within one Einstein radius. Of particular interest is DR2 5918299904067162240 (WISE J175839.20-583931.6), magnitude G=14.9, which will lens a G=13.9 background star in early 2030, with a median 23% net magnification. Other pairs are typically fainter, hampering characterisation of the lens (if the lens is faint) or the ability to accurately measure the magnification (if the source is much fainter than the lens). Of timely interest is DR2 4116504399886241792 (2MASS J17392440-2327071), which will lens a background star in July 2020, albeit with weak net magnification (0.03%). Median magnifications for the other five high-probability events range from 0.3% to 5.3%. The Einstein radii for these lenses are one to ten times the radius of the habitable zone, allowing these lensing events to pick out cold planets around the ice line, and filling a gap between transit and current microlensing detections of planets around very low-mass stars.
Conclusions. We provide a catalogue of the predicted events to aid future characterisation efforts. Current limitations include a lack of many high-proper-motion objects in Gaia DR2 and often large uncertainties on the proper motions of the background sources (or only two-parameter solutions). Both of these deficiencies will be rectified with Gaia DR3 in 2020. Further characterisation of the lenses is also warranted to better constrain their masses and predict the photometric magnifications.

Abstract Copyright: © ESO 2018

Journal keyword(s): gravitational lensing: micro - astrometry - planets and satellites: detection

VizieR on-line data: <Available at CDS (J/A+A/617/A135): mlens.dat>

Simbad objects: 60

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Number of rows : 60

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 LSPM J0146+3545 PM* 01 46 05.5933905160 +35 45 11.459599127   20.8   18.4   ~ 3 0
2 Gaia DR2 318399257231042048 * 01 46 05.8015358121 +35 45 06.507827612           ~ 1 0
3 WISEA J022008.59-515544.5 PM* 02 20 08.2159165363 -51 55 47.112888791           ~ 2 0
4 Gaia DR2 4744453460527256576 * 02 20 08.9791018186 -51 55 41.402896473           ~ 1 0
5 LP 354-291 PM* 02 53 37.6978975812 +26 33 14.496760789   18.0   16.0   ~ 5 0
6 Gaia DR2 116048577524443520 * 02 53 38.5026681715 +26 33 10.377858844           ~ 1 0
7 Gaia DR2 4612462514156484864 * 05 09 20.9811712224 -87 17 55.805266997           ~ 1 0
8 Gaia DR2 4612462518451692672 PM* 05 09 25.2547813343 -87 17 49.122297667           ~ 1 0
9 Ross 47 BY* 05 42 09.2672965388 +12 29 21.611736198 14.264 13.130 11.509 10.298 8.709 M4V 219 0
10 Gaia DR2 3340477712874873344 * 05 42 12.7531536723 +12 28 41.460154081           ~ 1 0
11 LSR J0609+2319 PM* 06 09 52.4366472758 +23 19 12.661939778   18.4   16.0   sdM5.0 9 0
12 Gaia DR2 3425318813215052288 * 06 09 54.5576072978 +23 18 47.470496950           ~ 1 0
13 Gaia DR2 2934637564368867072 PM* 07 07 30.9657201021 -17 16 23.635978771           ~ 1 0
14 Gaia DR2 2934637564369093632 * 07 07 31.1660525517 -17 16 26.766681447           ~ 1 0
15 2MASS J07252884-2644137 PM* 07 25 28.8599995649 -26 44 14.121415385           ~ 3 0
16 Gaia DR2 5613074690220317312 * 07 25 29.1777536462 -26 44 23.813736169           ~ 1 0
17 Gaia DR2 5529180853515235072 * 08 43 21.4367186929 -38 12 24.799860253           ~ 1 0
18 WISEA J084321.62-381228.8 PM* 08 43 21.7540537905 -38 12 31.752233167           ~ 2 0
19 Gaia DR2 5411468169435427328 * 09 46 01.4333205020 -46 19 48.634640195           ~ 1 0
20 Gaia DR2 5411468169440274560 PM* 09 46 01.8095795246 -46 19 47.834465610           ~ 1 0
21 Gaia DR2 5232662289986673536 * 10 43 32.5413747384 -68 47 38.386957539           ~ 1 0
22 Gaia DR2 5232662289996360448 PM* 10 43 33.1347880941 -68 47 40.595034720           ~ 1 0
23 Gaia DR2 5237644830015225728 * 11 21 24.6891288206 -64 02 43.990038065           ~ 1 0
24 Gaia DR2 5237644830027339904 PM* 11 21 25.2760674156 -64 02 45.531011123           ~ 1 0
25 Gaia DR2 5191076183240735232 * 11 33 30.8371594151 -84 39 28.124168717           ~ 1 0
26 Gaia DR2 5191076183243196160 PM* 11 33 32.6859686771 -84 39 26.648660383           ~ 1 0
27 Gaia DR2 5846206202256330240 * 14 06 12.2610736661 -69 57 18.333781864           ~ 1 0
28 Gaia DR2 5846206202262355712 PM* 14 06 13.1513663990 -69 57 17.269848418           ~ 2 0
29 Gaia DR2 5901094746125412608 * 14 56 37.8272854790 -50 59 10.697727019           ~ 1 0
30 PM J14566-5059N PM* 14 56 38.8250095185 -50 59 07.805238176           ~ 2 0
31 Gaia DR2 5800510224109658368 * 15 00 03.2868947364 -67 33 21.485886011           ~ 1 0
32 Gaia DR2 5800510224109658240 PM* 15 00 03.8166449340 -67 33 19.911397845           ~ 2 0
33 Gaia DR2 5903487940560263808 * 15 03 00.1954330839 -47 52 56.131378590           ~ 1 0
34 Gaia DR2 5903487940560263936 PM* 15 03 00.5350066307 -47 52 56.080961070           ~ 1 0
35 Gaia DR2 5819622622430477184 * 15 55 44.4524931167 -68 59 08.957311302           ~ 1 0
36 Gaia DR2 5819622622435541888 PM* 15 55 45.4145832387 -68 59 03.866741123           ~ 1 0
37 Gaia DR2 4114040737803216768 * 17 15 13.7224697924 -24 30 40.885015939           ~ 1 0
38 2MASS J17151380-2430332 PM* 17 15 13.7980308142 -24 30 33.589555317           ~ 3 0
39 Gaia DR2 4111740074149205632 * 17 23 40.5800437908 -22 37 58.893217544           ~ 1 0
40 Gaia DR2 4111740078488465408 PM* 17 23 40.9669768657 -22 37 52.909472527           ~ 1 0
41 Gaia DR2 4116504399831319424 * 17 39 23.6773872543 -23 27 08.033715075           ~ 1 0
42 2MASS J17392440-2327071 PM* 17 39 24.3548203179 -23 27 07.189833330     15.77     ~ 3 0
43 Gaia DR2 5918299908365843840 * 17 58 38.5234586386 -58 39 50.993558026           ~ 2 0
44 WISE J175839.20-583931.6 PM* 17 58 39.5599357933 -58 39 21.803239971           M6 6 0
45 Gaia DR2 4063191073886316928 * 18 01 52.2621677730 -27 07 05.344308153           ~ 1 0
46 2MASS J18015266-2706540 PM* 18 01 52.6620307403 -27 06 54.381875995     14.82     ~ 4 0
47 Gaia DR2 2042703900727995008 * 19 05 43.4171904428 +31 10 34.168604776           ~ 1 0
48 G 207-14 PM* 19 05 43.5437408690 +31 10 40.436623048   16.8   15.1   ~ 4 0
49 L 347-14 PM* 19 20 47.9834943463 -45 33 29.629210788   13.93 12.23     M4.5 53 0
50 Gaia DR2 6663600291839828096 * 19 20 50.0859569687 -45 35 06.249453252           ~ 1 0
51 Gaia DR2 2052808893622868352 * 19 22 40.5488866631 +38 17 56.343426038           ~ 1 0
52 LSPM J1922+3818 PM* 19 22 40.7214404103 +38 18 05.916515396   19.6   17.1   ~ 5 0
53 UCAC4 364-173307 PM* 19 42 43.2182734246 -17 23 24.337108219     13.59 14.271   M4.0 7 0
54 Gaia DR2 6870168801226177408 * 19 42 43.3147099589 -17 23 53.807998416           ~ 1 0
55 Gaia DR2 4301535507904403712 PM* 19 46 49.2612837866 +08 56 24.570518390           ~ 2 0
56 Gaia DR2 4301535507885645312 * 19 46 49.4244690769 +08 56 29.179771225           ~ 1 0
57 Gaia DR2 2030898105088410112 * 20 01 48.7152043564 +31 22 01.617230723           ~ 1 0
58 LSPM J2001+3122 PM* 20 01 48.7863890195 +31 22 09.314404600   19.6   16.7   ~ 4 0
59 LSPM J2311+6858 PM* 23 11 20.2027447508 +68 58 58.896547712   17.5   15.2   ~ 3 0
60 Gaia DR2 2214946455960518400 * 23 11 22.5837590571 +68 59 01.993018321           ~ 1 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-03:33:55

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