A multiplicity study of transiting exoplanet host stars. I. High-contrast imaging with VLT/SPHERE
作者： M. A. Kenworthy , P. F. L. Maxted , D. F. Evans , J. Southworth , A. J. Bohn
DOI: 10.1051/0004-6361/201937127
关键词: Exoplanet 、 Planet 、 Stars 、 Angular distance 、 Multiplicity (chemistry) 、 Physics 、 Astrophysics 、 High contrast imaging 、 Hot Jupiter 、 Proper motion
摘要: We study the multiplicity of host stars to known transiting extra-solar planets test competing theories on formation mechanisms hot Jupiters. observed 45 exoplanet using VLT/SPHERE/IRDIS search for potential companions. For each identified candidate companion we determined probability that it is gravitationally bound its by performing common proper motion checks and modelling synthetic stellar populations around host. detected new companions K2-38, WASP-72, WASP-80, WASP-87, WASP-88, WASP-108, WASP-118, WASP-120, WASP-122, WASP123, WASP-130, WASP-131 WASP-137. The closest candidates were at separations $0.124''\pm0.007''$ $0.189''\pm0.003''$ WASP-108 WASP-131; measured $K$ band contrasts indicate these are $0.35\pm0.02\,M_{\odot}$ $0.62^{+0.05}_{-0.04}\,M_{\odot}$, respectively. Including re-detection confirmation previously in 13 other systems derived a fraction $55.4^{+5.9}_{-9.4}\,\%$. representative sub-sample 40 Jupiter among our targets, rate $54.8^{+6.3}_{-9.9}\,\%$. Our data do not confirm any trend with eccentric planetary preferably part multiple systems. On average, reached magnitude contrast $8.5\pm0.9$ mag an angular separation 0.5''. This allows exclude additional masses larger than $0.08$ M$_\odot$ almost all systems; youngest this sensitivity achieved physical as small 10 au. presented shows SPHERE ideal instrument detect characterize close exoplanetary stars.
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