Microlensing exoplanet discoveries

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Re: Microlensing exoplanet discoveries

Post by Sirius_Alpha on 26th April 2018, 9:06 pm

Hey we've got parallaxes to microlensing planetary systems from Gaia DR2.

Microlensing planets in the light of the second data release of Gaia
https://arxiv.org/abs/1804.10136

Context. Extrasolar planets found by gravitational microlensing often require assumptions on the source star distance and relative proper motion. Only in a few cases has it been possible to confirm these findings with space-based observations or high-resolution follow-up. 25 planetary microlensing events can be positionally cross-matched with the second Gaia data release containing parallax and proper motion measurements Aims. In this work we subject all microlensing planets listed in the NASA's Exoplanet Archive to a consistency check by comparing them with Gaia data release 2 measurements. The resulting list is supposed to serve as a reference for the microlensing community and to test if standard assumptions that are made in microlensing studies hold. Methods. Gravitational microlensing can constrain the physical parameters lens mass and lens distance based on fit parameters, such as the event timescale, the microlensing parallax, and the source star crossing time. If some of these parameters are not available one needs to resort to indirect means of assessing the events, often involving a Galactic model. In this work, we seek to make an assessment of those parameters solely based on Gaia DR2. Results. We find that 19 of 25 planets are consistent within 2-sigma of their published lens and source distances. Changing the lens distance of the remaining 6 published planets could lead to revised parameter values that are accordingly compatible with the published ones. We expect the incompatible planet mass estimates to belong to a blend star.

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Re: Microlensing exoplanet discoveries

Post by Lazarus on 4th May 2018, 3:46 pm

A cold super-Neptune/sub-Saturn:

Poleski et al. "An ice giant exoplanet interpretation of the anomaly in microlensing event OGLE-2011-BLG-0173"
https://arxiv.org/abs/1805.00049
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Re: Microlensing exoplanet discoveries

Post by Sirius_Alpha on 28th May 2018, 1:08 pm

KMT-2016-BLG-1820 and KMT-2016-BLG-2142: Two Microlensing Binaries Composed of Planetary-mass Companions and Very-Low-Mass Primaries
https://arxiv.org/abs/1805.09983

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Re: Microlensing exoplanet discoveries

Post by Sirius_Alpha on 18th June 2018, 8:49 pm

A Planetary Microlensing Event with an Unusually Red Source Star: MOA-2011-BLG-291
https://arxiv.org/abs/1806.06106

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Re: Microlensing exoplanet discoveries

Post by Sirius_Alpha on 26th June 2018, 8:30 pm

An almanac of predicted microlensing events for the 21st century
https://arxiv.org/abs/1806.10003

Lensing targets of interest:
LAWD 37 will produce 41 events between 2026 and 2100. HD 180617, GJ 674 (1 planet), HD 39194 (3 planets), HD 145417 and GJ 588 will all produce more than 10 microlensing events. GJ 674's microlensing events will not be close enough to probe it's planetary system, but one of HD 39194's will on 16 Oct 2094 (3 days).

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Re: Microlensing exoplanet discoveries

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