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; V. Batista; D. P. Bennett; J.-B. Marquette; J. W. Blackman; A. A. Cole; C. Coutures; C. Danielski; D. Dominis-Prester; J. Donatowicz; A. Fukui; N. Koshimoto; C. Loncaric; J. C. Morales; T. Sumi; D. Suzuki; C. Henderson; Y. Shvartzvald; C. Beichman

doi:10.3847/1538-3881/aaa293

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

Document type :

Journal articles

Domain :

Sciences of the Universe [physics] / Astrophysics [astro-ph] / Instrumentation and Methods for Astrophysic [astro-ph.IM]

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https://hal.archives-ouvertes.fr/hal-01583262
Contributor : Marie-Paule Pomies <>
Submitted on : Thursday, September 7, 2017 - 10:09:01 AM
Last modification on : Friday, April 5, 2019 - 8:24:11 PM

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

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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

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