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Ongoing astrometric microlensing events from VVV and Gaia

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Ongoing astrometric microlensing events from VVV and Gaia. / McGill, Peter; Smith, Leigh C.; Evans, N. Wyn; Belokurov, Vasily; Lucas, Philip W.

In: Monthly Notices of the Royal Astronomical Society, Vol. 487, No. 1, 07.2019, p. L7-L12.

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McGill, Peter ; Smith, Leigh C. ; Evans, N. Wyn ; Belokurov, Vasily ; Lucas, Philip W. / Ongoing astrometric microlensing events from VVV and Gaia. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 487, No. 1. pp. L7-L12.

Bibtex

@article{0903af7a7c104aae925da0ce8de25697,
title = "Ongoing astrometric microlensing events from VVV and Gaia",
abstract = "We extend predictive microlensing event searches using the Vista Variables in the Via Lactea survey and the second Gaia data release. We identify two events with maxima in 2019 that require urgent follow-up. First, we predict that the nearby M2 dwarf L 338-152 will align with a background source with a closest approach of $35^{+35}_{-23}$ mas on 2019 November $16^{+28}_{-27}$ d. This will cause a peak astrometric shift and photometric amplification of the background source of $2.7^{+3.5}_{-1.5}$ mas and $5.6^{+143.2}_{-5.2}$ mmag respectively. This event should be astrometrically detectable by both the Hubble Space Telescope (HST) and the Spectro-Polarimetric High-contrast Exoplanet Research instrument on the Very Large Telescope. Secondly, we predict the likely K dwarf NLTT 45128 will lens a background source with a closest approach of $105.3^{+12.2}_{-11.7}$ mas on 2019 September $26^{+15}_{-15}$ d. This will produce a peak astrometric shift of $0.329^{+0.065}_{-0.059}$ mas. NLTT 45128 is only 3.6 magnitudes brighter than the background source which makes it an excellent candidate for follow-up with HST. Characterisation of these signals will allow direct gravitational masses to be inferred for both L 338-152 and NLTT 45128 with an estimated precision of $\sim9$ and $\sim13$ per cent respectively.",
keywords = "astro-ph.SR, astro-ph.IM",
author = "Peter McGill and Smith, {Leigh C.} and Evans, {N. Wyn} and Vasily Belokurov and Lucas, {Philip W.}",
note = "6 pages, 2 figures, accepted MNRAS Letters",
year = "2019",
month = "7",
doi = "10.1093/mnrasl/slz073",
language = "English",
volume = "487",
pages = "L7--L12",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "1",

}

RIS

TY - JOUR

T1 - Ongoing astrometric microlensing events from VVV and Gaia

AU - McGill, Peter

AU - Smith, Leigh C.

AU - Evans, N. Wyn

AU - Belokurov, Vasily

AU - Lucas, Philip W.

N1 - 6 pages, 2 figures, accepted MNRAS Letters

PY - 2019/7

Y1 - 2019/7

N2 - We extend predictive microlensing event searches using the Vista Variables in the Via Lactea survey and the second Gaia data release. We identify two events with maxima in 2019 that require urgent follow-up. First, we predict that the nearby M2 dwarf L 338-152 will align with a background source with a closest approach of $35^{+35}_{-23}$ mas on 2019 November $16^{+28}_{-27}$ d. This will cause a peak astrometric shift and photometric amplification of the background source of $2.7^{+3.5}_{-1.5}$ mas and $5.6^{+143.2}_{-5.2}$ mmag respectively. This event should be astrometrically detectable by both the Hubble Space Telescope (HST) and the Spectro-Polarimetric High-contrast Exoplanet Research instrument on the Very Large Telescope. Secondly, we predict the likely K dwarf NLTT 45128 will lens a background source with a closest approach of $105.3^{+12.2}_{-11.7}$ mas on 2019 September $26^{+15}_{-15}$ d. This will produce a peak astrometric shift of $0.329^{+0.065}_{-0.059}$ mas. NLTT 45128 is only 3.6 magnitudes brighter than the background source which makes it an excellent candidate for follow-up with HST. Characterisation of these signals will allow direct gravitational masses to be inferred for both L 338-152 and NLTT 45128 with an estimated precision of $\sim9$ and $\sim13$ per cent respectively.

AB - We extend predictive microlensing event searches using the Vista Variables in the Via Lactea survey and the second Gaia data release. We identify two events with maxima in 2019 that require urgent follow-up. First, we predict that the nearby M2 dwarf L 338-152 will align with a background source with a closest approach of $35^{+35}_{-23}$ mas on 2019 November $16^{+28}_{-27}$ d. This will cause a peak astrometric shift and photometric amplification of the background source of $2.7^{+3.5}_{-1.5}$ mas and $5.6^{+143.2}_{-5.2}$ mmag respectively. This event should be astrometrically detectable by both the Hubble Space Telescope (HST) and the Spectro-Polarimetric High-contrast Exoplanet Research instrument on the Very Large Telescope. Secondly, we predict the likely K dwarf NLTT 45128 will lens a background source with a closest approach of $105.3^{+12.2}_{-11.7}$ mas on 2019 September $26^{+15}_{-15}$ d. This will produce a peak astrometric shift of $0.329^{+0.065}_{-0.059}$ mas. NLTT 45128 is only 3.6 magnitudes brighter than the background source which makes it an excellent candidate for follow-up with HST. Characterisation of these signals will allow direct gravitational masses to be inferred for both L 338-152 and NLTT 45128 with an estimated precision of $\sim9$ and $\sim13$ per cent respectively.

KW - astro-ph.SR

KW - astro-ph.IM

U2 - 10.1093/mnrasl/slz073

DO - 10.1093/mnrasl/slz073

M3 - Article

VL - 487

SP - L7-L12

JO - Monthly Notices of the Royal Astronomical Society

T2 - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 1

ER -