Microlensing observations rapid search for exoplanets: morse code for GPUs

McDougall, Alistair; Albrow, M. D.

doi:10.1093/mnras/stv2609

Cited by 25 publications

(3 citation statements)

References 23 publications

(27 reference statements)

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“…The other model parameters were fitted by χ 2 minimization with ρ values found by interpolating between grid points with discrete convolutions. These calculations used a modified version of the Microlensing Observations Rapid Search for Exoplanets code (McDougall & Albrow 2016).…”

Section: Ground-based Analysismentioning

confidence: 99%

OGLE-2017-BLG-1038: A Possible Brown-dwarf Binary Revealed by Spitzer Microlensing Parallax

Malpas

Albrow

Yee

et al. 2022

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We report the analysis of microlensing event OGLE-2017-BLG-1038, observed by the Optical Gravitational Lensing Experiment, Korean Microlensing Telescope Network, and Spitzer telescopes. The event is caused by a giant source star in the Galactic Bulge passing over a large resonant binary-lens caustic. The availability of space-based data allows the full set of physical parameters to be calculated. However, there exists an eightfold degeneracy in the parallax measurement. The four best solutions correspond to very-low-mass binaries near ( M 1 = 170 − 50 + 40 M J and M 2 = 110 − 30 + 20 M J ), or well below ( M 1 = 22.5 − 0.4 + 0.7 M J and M 2 = 13.3 − 0.3 + 0.4 M J ) the boundary between stars and brown dwarfs. A conventional analysis, with scaled uncertainties for Spitzer data, implies a very-low-mass brown-dwarf binary lens at a distance of 2 kpc. Compensating for systematic Spitzer errors using a Gaussian process model suggests that a higher mass M-dwarf binary at 6 kpc is equally likely. A Bayesian comparison based on a galactic model favors the larger-mass solutions. We demonstrate how this degeneracy can be resolved within the next 10 years through infrared adaptive-optics imaging with a 40 m class telescope.

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Section: Ground-based Analysismentioning

confidence: 99%

OGLE-2017-BLG-1038: A Possible Brown-dwarf Binary Revealed by Spitzer Microlensing Parallax

Malpas

Albrow

Yee

et al. 2022

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“…Our fixed position results are then used as seeds for a more refined search using an MCMC algorithm implemented using the MORSE code (McDougall & Albrow 2016). A similar twostep process can also be seen in .…”

Section: Binary Lensmentioning

confidence: 99%

OGLE-2018-BLG-0677Lb: A Super-Earth Near the Galactic Bulge

Herrera-Martín

Albrow

Udalski

et al. 2020

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We report the analysis of the microlensing event OGLE-2018-BLG-0677. A small feature in the light curve of the event leads to the discovery that the lens is a star-planet system. Although there are two degenerate solutions that could not be distinguished for this event, both lead to a similar planet-host mass ratio. We perform a Bayesian analysis based on a Galactic model to obtain the properties of the system and find that the planet corresponds to a super-Earth/sub-Neptune with a mass of =-+ Å M M 3.96 planet 2.66 5.88

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“…Our analysis of the lightcurve was undertaken using a modified version of the GPU-accelerated code of McDougall & Albrow (2016). Initially we performed a search over a fixed grid of s, q, r, α, where r is the distance from the centers of caustics (a reparameterisation of u 0 ).…”

Section: Observationsmentioning

confidence: 99%

OGLE-2016-BLG-1266: A Probable Brown-Dwarf/Planet Binary at the Deuterium Fusion Limit

Albrow,

Yee,

Udalski

et al. 2018

Preprint

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Microlensing observations rapid search for exoplanets: morse code for GPUs

Cited by 25 publications

References 23 publications

OGLE-2017-BLG-1038: A Possible Brown-dwarf Binary Revealed by Spitzer Microlensing Parallax

OGLE-2017-BLG-1038: A Possible Brown-dwarf Binary Revealed by Spitzer Microlensing Parallax

OGLE-2018-BLG-0677Lb: A Super-Earth Near the Galactic Bulge

OGLE-2016-BLG-1266: A Probable Brown-Dwarf/Planet Binary at the Deuterium Fusion Limit

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