UKIRT-2017-BLG-001Lb: A Giant Planet Detected through the Dust

Y. Shvartzvald; S. Calchi Novati; B. S. Gaudi; G. Bryden; D. M. Nataf; M. T. Penny; C. Beichman; C. B. Henderson; S. Jacklin; E. F. Schlafly; M. J. Huston

doi:10.3847/2041-8213/aab71b

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UKIRT-2017-BLG-001Lb: A Giant Planet Detected through the Dust

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UKIRT-2017-BLG-001Lb: A Giant Planet Detected through the Dust

Y. Shvartzvald, S. Calchi Novati, B. S. Gaudi, G. Bryden, D. M. Nataf, M. T. Penny, C. Beichman, C. B. Henderson, S. Jacklin, E. F. Schlafly, …

Astrophysical journal. Letters, Vol.857(1), p.L8

04/10/2018

DOI: 10.3847/2041-8213/aab71b

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Abstract

We report the discovery of a giant planet in event UKIRT-2017-BLG-001, detected by the United Kingdom Infrared Telescope (UKIRT) microlensing survey. The mass ratio between the planet and its host is , about 1.5 times the Jupiter/Sun mass ratio. The event lies 0 35 from the Galactic center and suffers from high extinction of AK = 1.68. Therefore, it could be detected only by a near-infrared (NIR) survey. The field also suffers from large spatial differential extinction, which makes it difficult to estimate the source properties required to derive the angular Einstein radius. Nevertheless, we find evidence suggesting that the source is located in the far disk. If correct, this would be the first source star of a microlensing event to be identified as belonging to the far disk. We estimate the lens mass and distance using a Bayesian analysis to find that the planet's mass is , and it orbits a star at an instantaneous projected separation of au. The system is at a distance of kpc, and so likely resides in the Galactic bulge. In addition, we find a non-standard extinction curve in this field, in agreement with previous results toward high-extinction fields near the Galactic center.

binaries: general

Galaxy: bulge

gravitational lensing: micro

planetary systems

Details

Title: Subtitle: UKIRT-2017-BLG-001Lb: A Giant Planet Detected through the Dust
Creators: Y. Shvartzvald - Jet Propulsion Laboratory
S. Calchi Novati - Infrared Processing and Analysis Center
B. S. Gaudi - The Ohio State University
G. Bryden - Jet Propulsion Laboratory
D. M. Nataf - Johns Hopkins University
M. T. Penny - The Ohio State University
C. Beichman - NASA Exoplanet Science Institute
C. B. Henderson - California Institute of Technology
S. Jacklin - Vanderbilt University
E. F. Schlafly - Lawrence Berkeley National Laboratory
M. J. Huston - The Ohio State University
Resource Type: Journal article
Publication Details: Astrophysical journal. Letters, Vol.857(1), p.L8
Publisher: The American Astronomical Society
DOI: 10.3847/2041-8213/aab71b
ISSN: 2041-8205
eISSN: 2041-8213
Number of pages: 11
Alternative title: UKIRT-2017-BLG-001Lb: A Giant Planet Detected through the Dust
Language: English
Date published: 04/10/2018
Academic Unit: Physics and Astronomy
Record Identifier: 9984701722602771

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