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Magnetic topologies of two weak-line T Tauri stars TAP 4 and TAP 40

文献类型：期刊论文

作者Xiang Y(项越)4,5; Gu SH(顾盛宏)3,4,5; Donati, J.-F.2; Hussain, G. A.6; Cameron, A. Collier1
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2023-02-15
卷号520期号:3页码:3964-3973
ISSN号0035-8711
关键词techniques: polarimetric stars: imaging stars: magnetic fields stars: individual: TAP 4 stars: individual: TAP 40
DOI10.1093/mnras/stad363
产权排序第1完成单位
文献子类Article
英文摘要We present a Zeeman-Doppler imaging study of two weak-line T Tauri stars TAP 4 and TAP 40, based on the high-resolution spectropolarimetric observations with ESPaDOnS at the Canada-France-Hawaii Telescope in November 2013, in the framework of the Magnetic Topologies of Young Stars and Survival of close-in giant Exoplanets large programme. We apply two Zeeman-Doppler imaging codes to the Stokes I and V profiles to reconstruct their brightness and large-scale magnetic field images. The results given by the two imaging codes are in good agreement with each other. TAP 4 shows a large polar cool spot and several intermediate-latitude warm spots on its surface, whereas TAP 40 exhibits very weak variations in its Stokes I profiles, suggesting a mostly unspotted photosphere. We detect Zeeman signatures in the Stokes V profiles of both stars. The reconstructed magnetic maps reveal dominantly toroidal fields, which enclose about 60 percent of the total magnetic energy for both TAP 4 and TAP 40. Both stars show prominent circular ring features of the azimuthal magnetic field. We derive a solar-like surface differential rotation on TAP 4 from the tomographic modelling. The brightness image of TAP 4 is used to predict the radial velocity (RV) jitters induced by its activity. After filtering out the activity jitter, the rms of its RVs is reduced from 1.7 to 0.2 km s(-1), but we do not detect any periodic signals in the filtered RVs of TAP 4, implying that it is unlikely to host a close-in exoplanet more massive than similar to 3.5M(Jup) at 0.1 au.
学科主题天文学 ; 恒星与银河系
URL标识查看原文
出版地GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
WOS关键词DIFFERENTIAL ROTATION ; ACTIVE STARS ; YOUNG SUNS ; PHOTOMETRIC VARIABILITY ; HOT JUPITER ; AB-DORADUS ; FIELDS ; EVOLUTION ; PATTERNS ; BINARY
资助项目National Natural Science Foundation of China[10373023] ; National Natural Science Foundation of China[10773027] ; National Natural Science Foundation of China[11603068] ; National Natural Science Foundation of China[11903074] ; National Natural Science Foundation of China[U1531121]
WOS研究方向Astronomy & Astrophysics
语种英语
出版者OXFORD UNIV PRESS
WOS记录号WOS:001043810000013
资助机构National Natural Science Foundation of China[10373023, 10773027, U1531121, 11603068, 11903074] ; China Manned Space Project[CMS-CSST-2021-B07] ; European Research Council (ERC) under the H2020 research & innovation programme[740651]
源URL[http://ir.ynao.ac.cn/handle/114a53/26027]  
专题云南天文台_系外行星研究组
云南天文台_中国科学院天体结构与演化重点实验室
作者单位1.School of Physics and Astronomy, University of St Andrews, Fife, KY16 9SS, United Kingdom
2.IRAP, Université de Toulouse, CNRS, UPS, CNES, Toulouse, F-31400, France;
3.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing, 101408, China;
4.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650216, China;
5.Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650216, China;
6.Science Division, European Space Research and Technology Centre (ESA/ESTEC), Keplerlaan 1, Noordwijk, NL-2201 AZ, Netherlands;
推荐引用方式
GB/T 7714		 Xiang Y,Gu SH,Donati, J.-F.,et al. Magnetic topologies of two weak-line T Tauri stars TAP 4 and TAP 40[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2023,520(3):3964-3973.
APA Xiang Y,Gu SH,Donati, J.-F.,Hussain, G. A.,&Cameron, A. Collier.(2023).Magnetic topologies of two weak-line T Tauri stars TAP 4 and TAP 40.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,520(3),3964-3973.
MLA Xiang Y,et al."Magnetic topologies of two weak-line T Tauri stars TAP 4 and TAP 40".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 520.3(2023):3964-3973.

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来源：云南天文台

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