Portable adaptive optics for exoplanet imaging  

作　　者：Yong-Tian Zhu Jiang-Pei Dou Xi Zhang Gang Zhao Jing Guo Leopoldo Infante 

机构地区：[1]National Astronomical Observatories/Nanjing Institute of Astronomical Optics&Technology,Chinese Academy of Sciences,Nanjing 210042,China [2]Key Laboratory of Astronomical Optics&Technology,Nanjing Institute of Astronomical Optics&Technology,Chinese Academy of Sciences,Nanjing 210042,China [3]School of Astronomy and Space Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [4]Las Campanas Observatory,Observatories of the Carnegie Institution of Washington,Colina El Pino S/N Casilla 601 La Serena,Chile [5]Institute of Astrophysics,Pontificia Universidad Catolica de Chile,Av.Vic Mackenna 4860,Santiago,Chile [6]Nucleo de Astronomfa de la Facultad de Ingenierfa y Ciencias,Universidad Diego Portales,Manuel Rodriguez Sur 415,Santiago,Chile

出　　处：《Research in Astronomy and Astrophysics》2021年第4期110-118,共9页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11827804,U2031210)。

摘　　要：The portable adaptive optics(PAO)device is a low-cost and compact system,designed for 4-meter class telescopes that have no adaptive optics(AO)system,because of the physical space limitation at the Nasmyth or Cassegrain focus and the historically high cost of conventional AO.The initial scientific observations of the PAO are focused on the direct imaging of exoplanets and sub-stellar companions.This paper discusses the concept of PAO and the associated high-contrast imaging performance in our recent observational runs.PAO deliver a Strehl ratio better than 60%in H band under median seeing conditions of 1".Combined with our dedicated image rotation and subtraction(IRS)technique and the optimized IRS(O-IRS)algorithm,the averaged contrast ratio for a 5≤V_(mag)≤9 primary star is 1.3×10^(-5)and3.3×10^(-6)at angular distance of 0.36"with exposure time of 7 minutes and 2 hours,respectively.PAO has successfully revealed the known exoplanet ofκAnd b in our recent observation with the 3.5-meter ARC telescope at Apache Point Observatory.We have performed the associated astrometry and photometry analysis of the recoveredκAnd b planet,which gives a projected separation of 0.98"±0.05",a position angle of 51.1°±0.5°and a mass of 10.15_(-1.255)^(+2.19) MJup.These results demonstrate that PAO can be used for direct imaging of exoplanets with medium-sized telescopes.

关 键 词：stars:imaging instrumentation:adaptive optics instrumentation:high angular resolution methods:observational techniques:image processing 

分 类 号：P12[天文地球—天体测量]