Combining Spitzer parallax and Keck II adaptive optics imaging to measure the mass of a solar-like star orbited by a cold gaseous planet discovered by microlensing

J.-P. Beaulieu 1 V. Batista 2 D. P. Bennett J.-B. Marquette 3, 2 J. W. Blackman 4 A. A. Cole 5 C. Coutures 2, 6 C. Danielski D. Dominis-Prester J. Donatowicz A. Fukui 7 N. Koshimoto C. Loncaric J. C. Morales 8 T. Sumi 9 D. Suzuki 10 C. Henderson 11 Y. Shvartzvald C. Beichman
1 IMBE - Institut méditerranéen de biodiversité et d'écologie marine et continentale
2 IAP - Institut d'Astrophysique de Paris
3 M2A 2017
LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac]
4 Vanda Pharmaceuticals
5 Association for Cephalopod Research CephRes
6 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
7 Okayama Astrophysical Observatory
8 La Salle [Ramon Llull University]
9 Disaster Prevention Research Institute
10 IPNO - Institut de Physique Nucléaire d'Orsay
11 Department of Mathematics [Chicago]
Abstract : To obtain accurate mass measurements for cold planets discovered by microlensing, it is usually necessary to combine light curve modeling with at least two lens mass-distance relations. Often, a constraint on the Einstein ring radius measurement is obtained from the caustic crossing time: This is supplemented by secondary constraints such as precise parallax measurements and/or measures of the lens luminosity using high angular resolution observations. We resolved the source+lens star from sub-arcsecond blends in H band using adaptive optics (AO) observations with NIRC2 mounted on Keck II telescope. We identify additional flux, coincident with the source to within 160 mas. We estimate the potential contributions to this blended light (chance-aligned star, additional companion to the lens or to the source) and find that 85 % of of the NIR flux is due to the lens star at H_L=16.63 +- 0.06 and K_L=16.46 +- 0.06. We combined the parallax constraint and the AO constraint to derive the physical parameters of the system. The lensing system is composed of a mid-late type G main sequence star of M_L=0.89 +- 0.05 Mo located at D_L = 3.6 +- 0.3 kpc in the Galactic disk. Taking the mass ratio and projected separation from the original study leads to a planet of M_p= 0.64 +- 0.044 M_Jupiter at 3.48 +- 0.22 AU. Excellent parallax measurement from simultaneous ground-space observations have been obtained on the microlensing event OGLE-2014-BLG-0124, but it is only when they are combined with ~ 30 min of Keck II AO observations that the physical parameters of the host star are well measured.
Keywords : Astrophysics - Earth and Planetary Astrophysics
Type de document :
Article dans une revue
Astrophysical Journal, American Astronomical Society, 2018, 155 (2), pp.id. 78. 〈10.3847/1538-3881/aaa293〉
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Contributeur : Marie-Paule Pomies <>
Soumis le : jeudi 7 septembre 2017 - 10:09:01
Dernière modification le : dimanche 7 octobre 2018 - 01:11:22

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L3AB | IMBE | OSU-INSTITUT-PYTHEAS | DSM-IRFU | CEA | UNIV-AMU | INSU | IN2P3 | IPNO | UNIV-PARIS-SACLAY | CEA-DRF | CEA-UPSAY | UPMC | IAP

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J.-P. Beaulieu, V. Batista, D. P. Bennett, J.-B. Marquette, J. W. Blackman, et al.. Combining Spitzer parallax and Keck II adaptive optics imaging to measure the mass of a solar-like star orbited by a cold gaseous planet discovered by microlensing. Astrophysical Journal, American Astronomical Society, 2018, 155 (2), pp.id. 78. 〈10.3847/1538-3881/aaa293〉. 〈hal-01583262〉

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