REKTSINI, Natalia; BATISTA, Virginie; RANC, Clément; BENNETT, David; BEAULIEU, Jean-Philippe; BLACKMAN, Joshua; COLE, Andrew; TERRY, Sean; KOSHIMOTO, Naoki; BHATTACHARYA, Aparna; VANDOROU, Aikaterini; PLUNKETT, Thomas; MARQUETTE, Jean-Baptiste

doi:10.3847/1538-3881/ad2514

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REKTSINI, Natalia
Institut d'Astrophysique de Paris [IAP]

BATISTA, Virginie
Institut d'Astrophysique de Paris [IAP]

RANC, Clément
Institut d'Astrophysique de Paris [IAP]

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The Astronomical Journal. 2024-03-07, vol. 167, n° 4, p. 145

American Astronomical Society

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Abstract We revisit the planetary microlensing event OGLE-2013-BLG-0132/MOA-2013-BLG-148 using Keck adaptive optics imaging in 2013 with NIRC2 and in 2020, 7.4 yr after the event, with OSIRIS. The 2020 observations yield a source and lens separation of 56.91 ± 0.29 mas, which provides us with a precise measurement of the heliocentric proper motion of the event μ rel,hel = 7.695 ± 0.039 mas yr −1 . We measured the magnitude of the lens in the K band as K lens = 18.69 ± 0.04. Using these constraints, we refit the microlensing light curve and undertake a full reanalysis of the event parameters including the microlensing parallax π E and the distance to the source D S . We confirm the results obtained in the initial study by Mróz et al. and improve significantly upon the accuracy of the physical parameters. The system is an M dwarf of 0.495 ± 0.054 M ⊙ orbited by a cold, Saturn-mass planet of 0.26 ± 0.028 M Jup at projected separation r ⊥ = 3.14 ± 0.28 au. This work confirms that the planetary system is at a distance of 3.48 ± 0.36 kpc, which places it in the Galactic disk and not the Galactic bulge.< Réduire

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Precise Mass Measurement of OGLE-2013-BLG-0132/MOA-2013-BLG-148: A Saturn-mass Planet Orbiting an M Dwarf

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