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614 results on '"Wang, Yonghao"'

1. Constraining the Presence of Companion Planets in Hot Jupiter Planetary System Using TTV Observation from TESS

Author

Zhang, Zixin, Wang, Wenqin, Ma, Xinyue, Chen, Zhangliang, Wang, Yonghao, Yu, Cong, Liu, Shangfei, Gao, Yang, Tang, Baitian, and Ma, Bo

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

The presence of another planetary companion in a transiting exoplanet system can impact its transit light curve, leading to sinusoidal transit timing variations (TTV). By utilizing both $\chi^2$ and RMS analysis, we have combined the TESS observation data with an N-body simulation to investigate the existence of an additional planet in the system and put a limit on its mass. We have developed CMAT, an efficient and user-friendly tool for fitting transit light curves and calculating TTV with a theoretical period, based on which we can give a limit on its hidden companion's mass. We use 260 hot Jupiter systems from the complete TESS data set to demonstrate the use of CMAT. Our findings indicate that, for most systems, the upper mass limit of a companion planet can be restricted to several Jupiter masses. This constraint becomes stronger near resonance orbits, such as the 1:2, 2:1, 3:1, and 4:1 mean motion resonance, where the limit is reduced to several Earth masses. These findings align with previous studies suggesting that a lack of companion planets with resonance in hot Jupiter systems could potentially support the high eccentricity migration theory. Additionally, we observed that the choice between $\chi^2$ or {root mean square (RMS)} method does not significantly affect the upper limit on companion mass; however, $\chi^2$ analysis may result in weaker restrictions but is statistically more robust compared to RMS analysis in most cases., Comment: Accepted for publication in ApJS

Published
2024

2. Long-term Orbital Period Variation of Hot Jupiters from Transiting Time Analysis using TESS Survey Data

Author

Wang, Wenqin, Zhang, Zixin, Chen, Zhangliang, Wang, Yonghao, Yu, Cong, and Ma, Bo

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

Many hot Jupiters may experience orbital decays, which are manifested as long-term transit timing variations. We have analyzed 7068 transits from the Transiting Exoplanet Survey Satellite (TESS) for a sample of 326 hot Jupiters. These new mid-transit time data allow us to update ephemerides for these systems. By combining the new TESS transit timing data with archival data, we search for possible long-term orbital period variations in these hot Jupiters using a linear and a quadratic ephemeris model. We identified 26 candidates that exhibit possible long-term orbital period variations, including 18 candidates with decreasing orbital periods and 8 candidates with increasing orbital periods. Among them, 12 candidates have failed in our leave-one-out cross-validation (LOOCV) test and thus should be considered as marginal candidates. In addition to tidal interaction, alternative mechanisms such as apsidal precession, R{\o}mer effect, and Applegate effect could also contribute to the observed period variations. The ephemerides derived in this work are useful for scheduling follow-up observations for these hot Jupiters in the future. The Python code used to generate the ephemerides is made available online., Comment: Accepted for publication in ApJS

Published
2023

3. Supplementary Remarks: Tracking Down the Cultural Origins and Analyzing the Functions of Fenggu Aesthetic Genre

Author

Wang, Yonghao, Fang, Wang, Editor-in-Chief, Zhang, Siying, Associate Editor, Wang, Lin, Associate Editor, Zhang, Wen, Associate Editor, Yeh, Florence Chia-ying, Editorial Board Member, Zhang, Qizhi, Editorial Board Member, Lou, Yulie, Editorial Board Member, Wang, Ning, Editorial Board Member, Han, Zhen, Editorial Board Member, Yan, Xuejun, Editorial Board Member, Yuan, Jixi, Editorial Board Member, Zhao, Tingyang, Editorial Board Member, Wang, Keping, Editorial Board Member, Fang, Weigui, Editorial Board Member, Li, Chunqing, Editorial Board Member, Zhang, Jing, Editorial Board Member, Li, Jinglin, Editorial Board Member, Wang, Yonghao, and Chu, Jiajun, Translated by

Published
2024
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4. Shared Sensation and Connectedness: An Overview of Fenggu Aesthetic Genre

Author

Wang, Yonghao, Fang, Wang, Editor-in-Chief, Zhang, Siying, Associate Editor, Wang, Lin, Associate Editor, Zhang, Wen, Associate Editor, Yeh, Florence Chia-ying, Editorial Board Member, Zhang, Qizhi, Editorial Board Member, Lou, Yulie, Editorial Board Member, Wang, Ning, Editorial Board Member, Han, Zhen, Editorial Board Member, Yan, Xuejun, Editorial Board Member, Yuan, Jixi, Editorial Board Member, Zhao, Tingyang, Editorial Board Member, Wang, Keping, Editorial Board Member, Fang, Weigui, Editorial Board Member, Li, Chunqing, Editorial Board Member, Zhang, Jing, Editorial Board Member, Li, Jinglin, Editorial Board Member, Wang, Yonghao, and Chu, Jiajun, Translated by

Published
2024
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5. Standards and Norms for Calligraphy and Painting: Fenggu in Calligraphy

Author

Wang, Yonghao, Fang, Wang, Editor-in-Chief, Zhang, Siying, Associate Editor, Wang, Lin, Associate Editor, Zhang, Wen, Associate Editor, Yeh, Florence Chia-ying, Editorial Board Member, Zhang, Qizhi, Editorial Board Member, Lou, Yulie, Editorial Board Member, Wang, Ning, Editorial Board Member, Han, Zhen, Editorial Board Member, Yan, Xuejun, Editorial Board Member, Yuan, Jixi, Editorial Board Member, Zhao, Tingyang, Editorial Board Member, Wang, Keping, Editorial Board Member, Fang, Weigui, Editorial Board Member, Li, Chunqing, Editorial Board Member, Zhang, Jing, Editorial Board Member, Li, Jinglin, Editorial Board Member, Wang, Yonghao, and Chu, Jiajun, Translated by

Published
2024
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6. Art in a Class of Its Own: Fenggu in Painting

Author

Wang, Yonghao, Fang, Wang, Editor-in-Chief, Zhang, Siying, Associate Editor, Wang, Lin, Associate Editor, Zhang, Wen, Associate Editor, Yeh, Florence Chia-ying, Editorial Board Member, Zhang, Qizhi, Editorial Board Member, Lou, Yulie, Editorial Board Member, Wang, Ning, Editorial Board Member, Han, Zhen, Editorial Board Member, Yan, Xuejun, Editorial Board Member, Yuan, Jixi, Editorial Board Member, Zhao, Tingyang, Editorial Board Member, Wang, Keping, Editorial Board Member, Fang, Weigui, Editorial Board Member, Li, Chunqing, Editorial Board Member, Zhang, Jing, Editorial Board Member, Li, Jinglin, Editorial Board Member, Wang, Yonghao, and Chu, Jiajun, Translated by

Published
2024
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7. The Formation of Fenggu: From Brush and Ink to Character

Author

Wang, Yonghao, Fang, Wang, Editor-in-Chief, Zhang, Siying, Associate Editor, Wang, Lin, Associate Editor, Zhang, Wen, Associate Editor, Yeh, Florence Chia-ying, Editorial Board Member, Zhang, Qizhi, Editorial Board Member, Lou, Yulie, Editorial Board Member, Wang, Ning, Editorial Board Member, Han, Zhen, Editorial Board Member, Yan, Xuejun, Editorial Board Member, Yuan, Jixi, Editorial Board Member, Zhao, Tingyang, Editorial Board Member, Wang, Keping, Editorial Board Member, Fang, Weigui, Editorial Board Member, Li, Chunqing, Editorial Board Member, Zhang, Jing, Editorial Board Member, Li, Jinglin, Editorial Board Member, Wang, Yonghao, and Chu, Jiajun, Translated by

Published
2024
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8. The Beauty and Subtlety of Language: Fenggu as an Aesthetic Genre in Poetry

Author

Wang, Yonghao, Fang, Wang, Editor-in-Chief, Zhang, Siying, Associate Editor, Wang, Lin, Associate Editor, Zhang, Wen, Associate Editor, Yeh, Florence Chia-ying, Editorial Board Member, Zhang, Qizhi, Editorial Board Member, Lou, Yulie, Editorial Board Member, Wang, Ning, Editorial Board Member, Han, Zhen, Editorial Board Member, Yan, Xuejun, Editorial Board Member, Yuan, Jixi, Editorial Board Member, Zhao, Tingyang, Editorial Board Member, Wang, Keping, Editorial Board Member, Fang, Weigui, Editorial Board Member, Li, Chunqing, Editorial Board Member, Zhang, Jing, Editorial Board Member, Li, Jinglin, Editorial Board Member, Wang, Yonghao, and Chu, Jiajun, Translated by

Published
2024
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9. Foreword: New Idea Coming In—From Physiognomy to Character Judgement

Author

Wang, Yonghao, Fang, Wang, Editor-in-Chief, Zhang, Siying, Associate Editor, Wang, Lin, Associate Editor, Zhang, Wen, Associate Editor, Yeh, Florence Chia-ying, Editorial Board Member, Zhang, Qizhi, Editorial Board Member, Lou, Yulie, Editorial Board Member, Wang, Ning, Editorial Board Member, Han, Zhen, Editorial Board Member, Yan, Xuejun, Editorial Board Member, Yuan, Jixi, Editorial Board Member, Zhao, Tingyang, Editorial Board Member, Wang, Keping, Editorial Board Member, Fang, Weigui, Editorial Board Member, Li, Chunqing, Editorial Board Member, Zhang, Jing, Editorial Board Member, Li, Jinglin, Editorial Board Member, Wang, Yonghao, and Chu, Jiajun, Translated by

Published
2024
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12. Hubble WFC3 Spectroscopy of the Terrestrial Planets L~98-59~c \& d: No Evidence for a Clear Hydrogen Dominated Primary Atmosphere

Author

Zhou, Li, Ma, Bo, Wang, Yonghao, and Zhu, Yinan

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

The nearby bright M-dwarf star L~98-59 has three terrestrial-sized planets. One challenge remaining in characterizing atmospheres around such planets is that it is not known a priori whether they possess any atmospheres. Here we report the study of the atmospheres of L~98-59~c and L~98-59~d using the near-infrared spectral data from the G141 grism of HST/WFC3. We can reject the hypothesis of a clear atmosphere dominated by hydrogen and helium at a confidence level of $\sim$ 3~sigma for both planets. Thus they may have a primary hydrogen-dominated atmosphere with an opaque cloud layer, or have lost their primary hydrogen-dominated atmosphere and re-established a secondary thin atmosphere, or have no atmosphere at all. We cannot distinguish between these scenarios for the two planets using the current HST data. Future observations with JWST would be capable of confirming the existence of atmospheres around L~98-59~c and d and determining their compositions., Comment: 24pages, 18 figures, 5 tables, accepted to RAA

Published
2022
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13. Hubble WFC3 Spectroscopy of the Rocky Planet L 98-59 b: No Evidence for a Cloud-Free Primordial Atmosphere

Author

Zhou, Li, Ma, Bo, Wang, Yonghao, and Zhu, Yinan

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

We are using archived data from HST of transiting exoplanet L~98-59~b to place constraints on its potentially hot atmosphere. We analyze the data from five transit visits and extract the final combined transmission spectrum using Iraclis. Then we use the inverse atmospheric retrieval code TauREx to analyze the combined transmission spectrum. There is a weak absorption feature near 1.40~$\mu m$ and 1.55~$\mu m$ in the transmission spectrum, which can be modeled by a cloudy atmosphere with abundant HCN. However, the unrealistically high abundance of HCN derived cannot be explained by any equilibrium chemical model with reasonable assumptions. Thus, the likeliest scenario is that L~98-59~b has a flat, featureless transmission spectrum in the WFC3/G141 bandpass due to a thin atmosphere with high mean molecular weight, an atmosphere with an opaque aerosol layer, or no atmosphere, and it is very unlikely for L~98-59~b to have a clear hydrogen-dominated primary atmosphere. Due to the narrow wavelength coverage and low spectral resolution of HST/WFC3 G141 grism observation, we cannot tell these different scenarios apart. Our simulation shows future higher precision measurements over wider wavelengths from the James Webb Space Telescope (JWST) can be used to better characterize the planetary atmosphere of L~98-59~b., Comment: 15 pages, 11 figures, 6 tables, accepted for publication in AJ

Published
2022
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27. Using N-Dimensional Space Coding of Transform Coefficients for Video Steganography in H.265/HEVC

Author

Zhao, Hongguo, Liu, Yunxia, Wang, Yonghao, Liu, Hui, Zhao, Zhenghang, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Huang, De-Shuang, editor, Premaratne, Prashan, editor, Jin, Baohua, editor, Qu, Boyang, editor, Jo, Kang-Hyun, editor, and Hussain, Abir, editor

Published
2023
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35. The Third Data Release of the Beijing-Arizona Sky Survey

Author

Zou, Hu, Zhou, Xu, Fan, Xiaohui, Zhang, Tianmeng, Zhou, Zhimin, Peng, Xiyan, Nie, Jundan, Jiang, Linhua, McGreer, Ian, Cai, Zheng, Chen, Guangwen, Chen, Xinkai, Dey, Arjun, Fan, Dongwei, Findlay, Joseph R., Gao, Jinghua, Gu, Yizhou, Guo, Yucheng, He, Boliang, Jiang, Zhaoji, Jin, Junjie, Kong, Xu, Lang, Dustin, Lei, Fengjie, Lesser, Michael, Li, Feng, Li, Zefeng, Lin, Zesen, Ma, Jun, Maxwell, Moe, Meng, Xiaolei, Myers, Adam D., Ning, Yuanhang, Schlegel, David, Shao, Yali, Shi, Dongdong, Sun, Fengwu, Wang, Jiali, Wang, Shu, Wang, Yonghao, Wei, Peng, Wu, Hong, Wu, Jin, Wu, Xiaohan, Yang, Jinyi, Yang, Qian, Yuan, Qirong, and Yue, Minghao

Subjects
Astrophysics - Astrophysics of Galaxies, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The Beijing-Arizona Sky Survey (BASS) is a wide and deep imaging survey to cover a 5400 deg$^2$ area in the Northern Galactic Cap with the 2.3m Bok telescope using two filters ($g$ and $r$ bands). The Mosaic $z$-band Legacy Survey (MzLS) covers the same area in $z$ band with the 4m Mayall telescope. These two surveys will be used for spectroscopic targeting of the Dark Energy Spectroscopic Instrument (DESI). The BASS survey observations were completed in 2019 March. This paper describes the third data release (DR3) of BASS, which contains the photometric data from all BASS and MzLS observations between 2015 January and 2019 March. The median astrometric precision relative to {\it Gaia} positions is about 17 mas and the median photometric offset relative to the PanSTARRS1 photometry is within 5 mmag. The median $5\sigma$ AB magnitude depths for point sources are 24.2, 23.6, and 23.0 mag for $g$, $r$, and $z$ bands, respectively. The photometric depth within the survey area is highly homogeneous, with the difference between the 20\% and 80\% depth less than 0.3 mag. The DR3 data, including raw data, calibrated single-epoch images, single-epoch photometric catalogs, stacked images, and co-added photometric catalogs, are publicly accessible at \url{http://batc.bao.ac.cn/BASS/doku.php?id=datarelease:home}., Comment: published in ApJS

Published
2019
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38. A Novel Two-Dimensional Histogram Shifting Video Steganography Algorithm for Video Protection in H.265/HEVC

Author

Zhao, Hongguo, Liu, Yunxia, Wang, Yonghao, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Huang, De-Shuang, editor, Jo, Kang-Hyun, editor, Jing, Junfeng, editor, Premaratne, Prashan, editor, Bevilacqua, Vitoantonio, editor, and Hussain, Abir, editor

Published
2022
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39. Classification of Heads in Multi-head Attention Mechanisms

Author

Huang, Feihu, Jiang, Min, Liu, Fang, Xu, Dian, Fan, Zimeng, Wang, Yonghao, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Memmi, Gerard, editor, Yang, Baijian, editor, Kong, Linghe, editor, Zhang, Tianwei, editor, and Qiu, Meikang, editor

Published
2022
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40. SSA: A Content-Based Sparse Attention Mechanism

Author

Sun, Yang, Hu, Wei, Liu, Fang, Huang, Feihu, Wang, Yonghao, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Memmi, Gerard, editor, Yang, Baijian, editor, Kong, Linghe, editor, Zhang, Tianwei, editor, and Qiu, Meikang, editor

Published
2022
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41. Building up Personas by Clustering Behavior Motivation from Extreme Users

Author

Xin, Xin, Wang, Yonghao, Zhang, Yiwen, Wu, Qianqian, Yang, Wenmin, Yang, Chenhong, Zhang, Rongrong, Lai, Michael T., Liu, Wei, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Soares, Marcelo M., editor, Rosenzweig, Elizabeth, editor, and Marcus, Aaron, editor

Published
2022
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49. Low latency audio processing

Author

Wang, Yonghao

Subjects
621.389, Electronic Engineering and Computer Science, live audio processing, latency problems
Abstract

Latency in the live audio processing chain has become a concern for audio engineers and system designers because significant delays can be perceived and may affect synchronisation of signals, limit interactivity, degrade sound quality and cause acoustic feedback. In recent years, latency problems have become more severe since audio processing has become digitised, high-resolution ADCs and DACs are used, complex processing is performed, and data communication networks are used for audio signal transmission in conjunction with other traffic types. In many live audio applications, latency thresholds are bounded by human perceptions. The applications such as music ensembles and live monitoring require low delay and predictable latency. Current digital audio systems either have difficulties to achieve or have to trade-off latency with other important audio processing functionalities. This thesis investigated the fundamental causes of the latency in a modern digital audio processing system: group delay, buffering delay, and physical propagation delay and their associated system components. By studying the time-critical path of a general audio system, we focus on three main functional blocks that have the significant impact on overall latency; the high-resolution digital filters in sigma-delta based ADC/DAC, the operating system to process low latency audio streams, and the audio networking to transmit audio with flexibility and convergence. In this work, we formed new theory and methods to reduce latency and accurately predict latency for group delay. We proposed new scheduling algorithms for the operating system that is suitable for low latency audio processing. We designed a new system architecture and new protocols to produce deterministic networking components that can contribute the overall timing assurance and predictability of live audio processing. The results are validated by simulations and experimental tests. Also, this bottom-up approach is aligned with the methodology that could solve the timing problem of general cyber-physical systems that require the integration of communication, software and human interactions.

Published
2018

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