2020A&A...640A..83K


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.26CET14:30:51

2020A&A...640A..83K - Astronomy and Astrophysics, volume 640A, 83-83 (2020/8-1)

Expectations on mass determination using astrometric microlensing by Gaia.

KLUTER J., BASTIAN U. and WAMBSGANSS J.

Abstract (from CDS):


Context. Astrometric gravitational microlensing can be used to determine the mass of a single star (the lens) with an accuracy of a few percent. To do so, precise measurements of the angular separations between lens and background star with an accuracy below 1 milli - arcsec at different epochs are needed. Therefore only the most accurate instruments can be used. However, since the timescale is on the order of months to years, the astrometric deflection might be detected by Gaia, even though each star is only observed on a low cadence.
Aims. We want to show how accurately Gaia can determine the mass of the lensing star.
Methods. Using conservative assumptions based on the results of the second Gaia data release (Gaia DR2), we simulated the individual Gaia measurements for 501 predicted astrometric microlensing events during the Gaia era (2014.5-2026.5). For this purpose we used the astrometric parameters of Gaia DR2, as well as an approximative mass based on the absolute G magnitude. By fitting the motion of the lens and source simultaneously, we then reconstructed the 11 parameters of the lensing event. For lenses passing by multiple background sources, we also fitted the motion of all background sources and the lens simultaneously. Using a Monte-Carlo simulation we determined the achievable precision of the mass determination.
Results. We find that Gaia can detect the astrometric deflection for 114 events. Furthermore, for 13 events Gaia can determine the mass of the lens with a precision better than 15% and for 13 + 21 = 34 events with a precision of 30% or better.

Abstract Copyright: © ESO 2020

Journal keyword(s): astrometry - gravitational lensing: micro - stars: low-mass - catalogs - proper motions - white dwarfs

VizieR on-line data: <Available at CDS (J/A+A/640/A83): table.dat>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 55

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Number of rows : 55

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 G 217-32 ** 00 07 42.5897845972 +60 22 54.070064648   14.66   12.964   M4.0V 28 1
2 HD 2404 PM* 00 27 43.5237775072 -32 23 14.890833968   9.78 9.03     G6V 32 0
3 L 51-47 PM* 01 09 17.2175332925 -72 12 42.237734013   14.45 12.86 12.557   M4V 18 0
4 LP 350-66 PM* 01 10 40.4789013403 +22 04 34.048936289   15.37   13.2   ~ 4 0
5 OGLE SMC115.5 319 PM* 01 11 03.6687747282 -72 27 41.259595328     18.232   17.432 ~ 4 0
6 G 245-47A PM* 02 13 53.5206807144 +72 34 01.589886981           ~ 1 0
7 HD 18757 PM* 03 04 09.6344824917 +61 42 20.959343616   7.25   6.2   G1.5V 120 0
8 HD 22399 PM* 03 39 58.8154752869 +63 52 13.475202942   7.26   6.6   F5 34 0
9 L 230-188 PM* 04 10 28.1233708893 -53 36 08.138281500   15.51 13.58     M4.5 35 0
10 BD-06 855 PM* 04 14 58.1069690964 -05 37 48.859109554   11.278 10.601 10.192 9.794 ~ 70 0
11 EGGR 180 WD* 04 31 12.5709459511 +58 58 41.292650735 12.29 12.77   12.8   DC5 109 0
12 L 31-84 PM* 05 16 59.7169913801 -78 17 20.299294908   13.39 11.91 11.551 9.42 M3V 31 0
13 OGLE LMC162.5 41235 PM* 05 24 09.4874327289 -69 37 57.866394332     17.087   16.562 ~ 3 0
14 G 100-35B PM* 05 47 56.5477454763 +18 39 23.252478246           ~ 1 0
15 HD 44573 BY* 06 21 33.1263299544 -22 12 53.109920796   9.38 8.46     K2.5Vk: 54 0
16 G 251-35 PM* 07 28 06.6280201919 +76 07 17.300309855       9.9   K3 13 0
17 L 601-78 ** 07 54 54.7343365502 -29 20 56.290487896   14.562 12.802 12.495 9.85 M4 24 0
18 HD 66553 SB* 08 04 34.6751850909 +15 21 51.309708584   9.33   7.8   G5 43 0
19 PM J08503-5848 PM* 08 50 21.3032073813 -58 48 06.213089498   18.0   17.7 17.1 ~ 2 0
20 L 820-19 ** 08 54 05.3255812704 -13 07 30.677330051   13.55 11.94 11.464   M3.5V 36 0
21 HD 77006 PM* 09 01 37.0374845392 +49 44 12.581447295       7.5   G5 38 0
22 * 75 Cnc SB* 09 08 47.3331192407 +26 37 44.803848928   6.64   5.5   G5IV-V 124 0
23 HD 78663 PM* 09 09 30.1642885457 -00 23 54.352877027   9.39 8.62     G8V 27 0
24 L 100-115 PM* 09 42 46.3420429010 -68 53 06.003864262   14.51 12.78 11.35 9.61 M4.0V 46 0
25 HD 85228 ** 09 48 46.7495291169 -52 36 56.558316765   8.83 7.91     K2VCN+0.5 49 0
26 L 143-23 PM* 10 44 21.2334129761 -61 12 35.263329881   15.74 13.920 12.33 10.31 M5.5V 53 0
27 HD 304043 PM* 11 16 00.2045864202 -57 32 51.571393210 13.666 12.848 11.516 10.497 9.132 M3.5 52 1
28 LAWD 37 WD* 11 45 42.9170659451 -64 50 29.464090822 11.08 11.725 11.513 11.34 11.163 DQ 233 0
29 HD 110833 SB* 12 44 14.5447567445 +51 45 33.372388151   7.98   6.4   K3 146 0
30 G 123-61A PM* 12 48 09.7696557490 +47 13 32.255127308           ~ 1 0
31 G 123-61B PM* 12 48 09.7824712257 +47 13 31.270885184           ~ 1 0
32 HD 120065 PM* 13 46 47.7127595910 +22 31 25.718895214       8.0   F8 22 0
33 HD 124584 PM* 14 17 04.7747839935 -66 18 57.793955497   7.87 7.28     G0/1V 45 0
34 V* V645 Cen Er* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 986 0
35 LP 859-51 PM* 15 27 35.2213778596 -26 22 07.563968583     13.58     ~ 2 0
36 G 16-29 PM* 16 06 41.2050882401 +08 23 18.180113490       11.198   M1.0Ve 56 0
37 HD 146868 PM* 16 14 57.0765553619 +60 40 11.169763155   8.35   7.3   G4 32 2
38 HD 149192 ** 16 35 50.3673864640 -53 45 25.377472978 10.881 9.896 8.781 8.117 7.529 K4Vk: 24 0
39 HD 155918 PM* 17 22 12.6497907055 -75 20 53.342009253   7.60 7.04     G2VFe-1.0CH-0.6 95 0
40 CD-32 12693 PM* 17 23 49.2273668925 -32 15 16.275961326 14.355 13.137 11.635 10.648 9.532 M1.5 36 0
41 CD-46 11540 PM* 17 28 39.9455601300 -46 53 42.693246243 12.177 10.973 9.407 8.337 7.006 M3V 207 1
42 L 702-43 PM* 17 36 45.7872216394 -22 20 43.914556126       14.52 11.49 M4 6 0
43 NAME Barnard's star BY* 17 57 48.4997994034 +04 41 36.111354228 12.497 11.24 9.511 8.298 6.741 M4V 666 2
44 HD 177758 PM* 19 06 25.3194524931 -11 53 50.686076100   7.81 7.24     G2VFe-1.0CH-0.6 86 0
45 Ross 733 Er* 19 14 39.1583105319 +19 19 03.721011353 13.861 12.964 11.536 10.445 9.012 M4.5V 52 1
46 EC 19249-7343 Sy? 19 31 01.4040260093 -73 37 05.224243538 13.22 13.69 12.89 12.788 10.63 ~ 7 0
47 HD 197484 PM* 20 45 32.4528617784 -42 57 00.534558487   9.50 8.88     G3V 28 0
48 * 61 Cyg A BY* 21 06 53.9396100677 +38 44 57.897024357 7.50 6.39 5.21 4.19 3.54 K5V 950 0
49 * 61 Cyg B Er* 21 06 55.2640651855 +38 44 31.362140913 8.63 7.40 6.03 4.86 3.55 K7V 670 1
50 UCAC3 27-74415 PM* 21 14 12.1985647475 -76 33 25.291719560   13.76 12.23 11.929 9.73 M4e 4 0
51 LSPM J2129+4720 PM* 21 29 38.8649933011 +47 20 29.512551696   15.8   13.7   ~ 3 0
52 HD 207450 PM* 21 50 04.9907053665 -38 36 52.992581118   8.02 7.45     G0V 26 0
53 BD+43 4138 PM* 22 08 44.8920860052 +44 33 23.461995844       8.4   G0 6 0
54 BD+00 5017 ** 23 35 00.2769821069 +01 36 19.433847921 12.082 10.893 9.546 8.703 7.879 K7V 131 0
55 HD 222506 PM* 23 41 22.8906670273 -20 05 10.092287658   10.37 9.53     G8V 8 0

    Equat.    Gal    SGal    Ecl

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2020.10.26-14:30:51

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