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Using source proper motion to validate terrestrial parallax : OGLE-2019-BLG-1058
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(2021) Using source proper motion to validate terrestrial parallax : OGLE-2019-BLG-1058. The Astronomical Journal, 162 (6). p. 267. doi:10.3847/1538-3881/ac2ba5 ISSN 0004-6256.
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Official URL: https://doi.org/10.3847/1538-3881/ac2ba5
Abstract
We show that because the conditions for producing terrestrial microlens parallax (TPRX; i.e., a nearby disk lens) will also tend to produce a large lens-source relative proper motion (μ rel), source proper motion ( μ S) measurements in general provide a strong test of TPRX signals, which Gould & Yee (2013) showed were an important probe of free-floating planet (FFP) candidates. As a case study, we report a single-lens/single-source microlensing event designated as OGLE-2019-BLG-1058. For this event, the short timescale (∼2.5 days) and very fast μ rel (∼17.6 mas yr−1) suggest that this isolated lens is an FFP candidate located in the disk of our Galaxy. For this event, we find a TPRX signal consistent with a disk FFP, but at low significance. A direct measurement of the μ S shows that the large μ rel is due to an extreme μ S, and thus, the lens is consistent with being a very-low-mass star in the bulge and the TPRX measurement is likely spurious. By contrast, we show how a precise measurement of μ S with the mean properties of the bulge proper motion distribution would have given the opposite result; i.e., provided supporting evidence for an FFP in the disk and the TPRX measurement.
Item Type: | Journal Article | |||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
SWORD Depositor: | Library Publications Router | |||||||||
Journal or Publication Title: | The Astronomical Journal | |||||||||
Publisher: | Institute of Physics Publishing, Inc. | |||||||||
ISSN: | 0004-6256 | |||||||||
Official Date: | 26 November 2021 | |||||||||
Dates: |
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Volume: | 162 | |||||||||
Number: | 6 | |||||||||
Page Range: | p. 267 | |||||||||
DOI: | 10.3847/1538-3881/ac2ba5 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||
Contributors: |
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