Discovery of a bright microlensing event with planetary features towards the Taurus region: a super-Earth planet
Authors:
Nucita A., Licchelli D., De_Paolis F., Ingrosso G., Strafella F., Katysheva N., Shugarov S.
Image & caption:
Please click on image thumbnail to get more info:
Image caption::
Fig 1. The data from the Stara Lesna, CSAI (orange), FO telescopes, ASAS-SN and AAVSO,
are shown on the left-hand panel in V band. We also give the best-fitting curve.
Fig. 2. We show the geometry of the lens system for two models. (see the text in MNRAS
for details)
Description:
The transient event labelled as TCP J05074264+2447555 recently discovered towards the Taurus region was quickly recognized to be an ongoing microlensing event on a source located at distance of only 700–800 pc from Earth. Here, we show that observations with high sampling rate close to the time of maximum magnification revealed features that imply the presence of a binary lens system with very low-mass ratio components. We present a complete description of the binary lens system, which host an Earth-like planet with most likely mass of 9.2 ± 6.6 M⊕. Furthermore, the source estimated location and detailed Monte Carlo simulations allowed us to classify the event as due to the closest lens system, being at a distance of ≃380 pc and mass ≃0.25 M⊙.
Reference:
Monthly Notices of the Royal Astronomical Society, 476, 2962-2967 (2018)
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SAS
