文章基本信息

标题：Debris Disk Results from the Gemini Planet Imager Exoplanet Surveyʼs Polarimetric Imaging Campaign
本地全文：下载
作者：Thomas M.Esposito ; Paul Kalas ; Michael P.Fitzgerald 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2020
卷号：160
期号：1
页码：1-44
DOI：10.3847/1538-3881/ab9199
语种：English
出版社：American Institute of Physics
摘要：We report the results of a ~4 yr direct imaging survey of 104 stars to resolve and characterize circumstellar debris disks in scattered light as part of the Gemini Planet Imager (GPI) Exoplanet Survey. We targeted nearby (lesssim150 pc), young (lesssim500 Myr) stars with high infrared (IR) excesses (LIR/Lsstarf > 10−5), including 38 with previously resolved disks. Observations were made using the GPI high-contrast integral field spectrograph in H-band (1.6 μm) coronagraphic polarimetry mode to measure both polarized and total intensities. We resolved 26 debris disks and 3 protoplanetary/transitional disks. Seven debris disks were resolved in scattered light for the first time, including newly presented HD 117214 and HD 156623, and we quantified basic morphologies of five of them using radiative transfer models. All of our detected debris disks except HD 156623 have dust-poor inner holes, and their scattered-light radii are generally larger than corresponding radii measured from resolved thermal emission and those inferred from spectral energy distributions. To assess sensitivity, we report contrasts and consider causes of nondetections. Detections were strongly correlated with high IR excess and high inclination, although polarimetry outperformed total intensity angular differential imaging for detecting low-inclination disks (lesssim70°). Based on postsurvey statistics, we improved upon our presurvey target prioritization metric predicting polarimetric disk detectability. We also examined scattered-light disks in the contexts of gas, far-IR, and millimeter detections. Comparing H-band and ALMA fluxes for two disks revealed tentative evidence for differing grain properties. Finally, we found no preference for debris disks to be detected in scattered light if wide-separation substellar companions were present.
关键词：Debris disks (363);Circumstellar disks (235);Polarimetry (1278);Near infrared astronomy (1093);Coronagraphic imaging (313);Direct imaging (387);Circumstellar dust (236); Astronomy data modeling (1859);Exoplanet systems (484);Surveys (1671);Protoplanetary disks (1300)