Magnetic topologies of two weak-line T Tauri stars TAP 4 and TAP 40 | |
Xiang Y(项越)4,5; Gu SH(顾盛宏)3,4,5; Donati, J.-F.6; Hussain, G. A.2; Cameron, A. Collier1 | |
刊名 | Monthly Notices of the Royal Astronomical Society |
2023-04-01 | |
卷号 | 520期号:3页码:3964-3973 |
关键词 | techniques: polarimetric stars: imaging stars: magnetic fields stars: individual: TAP 4 stars: individual: TAP 40 |
ISSN号 | 0035-8711 |
DOI | 10.1093/mnras/stad363 |
产权排序 | 第1完成单位 |
文献子类 | Journal article (JA) |
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 per cent 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 ∼3.5MJup at 0.1 au. © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. |
学科主题 | 天文学 ; 恒星与银河系 |
URL标识 | 查看原文 |
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] |
语种 | 英语 |
出版者 | Oxford University Press |
资助机构 | National Natural Science Foundation of China[10373023, 10773027, 11603068, 11903074, U1531121] |
内容类型 | 期刊论文 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/26027] |
专题 | 云南天文台_系外行星研究组 |
作者单位 | 1.School of Physics and Astronomy, University of St Andrews, Fife, KY16 9SS, United Kingdom 2.Science Division, European Space Research and Technology Centre (ESA/ESTEC), Keplerlaan 1, Noordwijk, NL-2201 AZ, Netherlands; 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.IRAP, Université de Toulouse, CNRS, UPS, CNES, Toulouse, F-31400, France; |
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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