Volume 636, April 2020
|Number of page(s)||5|
|Section||Letters to the Editor|
|Published online||28 April 2020|
Letter to the Editor
Parallax in microlensing toward the Magellanic Clouds: Effect on detection efficiency and detectability
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie, CNRS Université Paris-Saclay, Bât. 100, Faculté des Sciences, 91405 Orsay Cedex, France
Accepted: 10 April 2020
Aims. We study the effect of the parallax on the search for microlensing events on very long timescales towards the Magellanic Clouds caused by dark massive compact objects within the past MACHO and EROS, the on-going MOA and OGLE, and the future LSST surveys. We quantify what neglecting this effect means in the classical event selection process and also quantify the parallax detectability without the help of follow-up observations.
Methods. We defined the distance between true events affected by parallax and the closest events without parallax. This distance was used to estimate the probability of missing the preselection of events because of parallax for any survey characterised by its time sampling and photometric performance. We also defined another distance to quantify the detectability of the parallax effect in order to trigger complementary observations.
Results. We find that the preselection of year-long timescale events is marginally affected by parallax for all surveys if the criteria are reasonably tight. We also show that the parallax should be detectable in most of the events found by the LSST survey without follow-up observations.
Key words: gravitational lensing: micro / Galaxy: halo / Galaxy: kinematics and dynamics / surveys / stars: black holes / dark matter
© T. Blaineau and M. Moniez 2020
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.