14 results on '"Yu, Zhouyi"'
Search Results
2. Exoplanets in the Antarctic Sky. I. The First Data Release of AST3-II (CHESPA) and New Found Variables within the Southern CVZ of TESS
- Author
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Zhang, Hui, Yu, Zhouyi, Liang, Ensi, Yang, Ming, Ashley, Michael C. B., Cui, Xiangqun, Du, Fujia, Fu, Jianning, Gong, Xuefei, Gu, Bozhong, Hu, Yi, Jiang, Peng, Liu, Huigen, Lawrence, Jon, Liu, Qiang, Li, Xiaoyan, Li, Zhengyang, Ma, Bin, Mould, Jeremy, Shang, Zhaohui, Suntzeff, Nicholas B., Tao, Charling, Tian, Qiguo, Tinney, C. G., Uddin, Syed A., Wang, Lifan, Wang, Songhu, Wang, Xiaofeng, Wei, Peng, Wright, Duncan, Wu, Xuefeng, Wittenmyer, Robert A., Xu, Lingzhe, Yang, Shi-hai, Yu, Ce, Yuan, Xiangyan, Zheng, Jessica, Zhou, Hongyan, Zhou, Ji-lin, and Zhu, Zhenxi
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Astrophysics - Instrumentation and Methods for Astrophysics ,Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Solar and Stellar Astrophysics - Abstract
Located at Dome A, the highest point of the Antarctic plateau, the Chinese Kunlun station is considered to be one of the best ground-based photometric sites because of its extremely cold, dry, and stable atmosphere(Saunders et al. 2009). A target can be monitored from there for over 40 days without diurnal interruption during a polar winter. This makes Kunlun station a perfect site to search for short-period transiting exoplanets. Since 2008, an observatory has been built at Kunlun station and three telescopes are working there. Using these telescopes, the AST3 project has been carried out over the last six years with a search for transiting exoplanets as one of its key programs (CHESPA). In the austral winters of 2016 and 2017, a set of target fields in the Southern CVZ of TESS (Ricker et al. 2009) were monitored by the AST3-II telescope. In this paper, we introduce the CHESPA and present the first data release containing photometry of 26,578 bright stars (m_i < 15). The best photometric precision at the optimum magnitude for the survey is around 2 mmag. To demonstrate the data quality, we also present a catalog of 221 variables with a brightness variation greater than 5 mmag from the 2016 data. Among these variables, 179 are newly identified periodic variables not listed in the AAVSO databasea), and 67 are listed in the Candidate Target List(Stassun et al. 2017). These variables will require careful attention to avoid false-positive signals when searching for transiting exoplanets. Dozens of new transiting exoplanet candidates will be also released in a subsequent paper(Zhang et al. 2018b)., Comment: 42 pages, 23 figures and 4 tables, ApJS accepted
- Published
- 2018
- Full Text
- View/download PDF
3. Exoplanets in the Antarctic sky. II. 116 Transiting Exoplanet Candidates Found by AST3-II (CHESPA) within the Southern CVZ of TESS
- Author
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Zhang, Hui, Yu, Zhouyi, Liang, Ensi, Yang, Ming, Ashley, Michael C. B., Cui, Xiangqun, Du, Fujia, Fu, Jianning, Gong, Xuefei, Gu, Bozhong, Hu, Yi, Jiang, Peng, Liu, Huigen, Lawrence, Jon, Liu, Qiang, Li, Xiaoyan, Li, Zhengyang, Ma, Bin, Mould, Jeremy, Shang, Zhaohui, Suntzeff, Nicholas B., Tao, Charling, Tian, Qiguo, Tinney, C. G., Uddin, Syed A., Wang, Lifan, Wang, Songhu, Wang, Xiaofeng, Wei, Peng, Wright, Duncan, Wu, Xuefeng, Wittenmyer, Robert A., Xu, Lingzhe, Yang, Shi-hai, Yu, Ce, Yuan, Xiangyan, Zheng, Jessica, Zhou, Hongyan, Zhou, Ji-lin, and Zhu, Zhenxi
- Subjects
Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
We report first results from the CHinese Exoplanet Searching Program from Antarctica (CHESPA)---a wide-field high-resolution photometric survey for transiting exoplanets carried out using telescopes of the AST3 (Antarctic Survey Telescopes times 3) project. There are now three telescopes (AST3-I, AST3-II, and CSTAR-II) operating at Dome A---the highest point on the Antarctic Plateau---in a fully automatic and remote mode to exploit the superb observing conditions of the site, and its long and uninterrupted polar nights. The search for transiting exoplanets is one of the key projects for AST3. During the Austral winters of 2016 and 2017 we used the AST3-II telescope to survey a set of target fields near the southern ecliptic pole, falling within the continuous viewing zone of the TESS mission \citep{Ricker10}. The first data release of the 2016 data, including images, catalogs and lightcurves of 26578 bright stars ($7.5\le i \le15$) was presented in \citet{Zhang18}. The best precision, as measured by the RMS of the lightcurves at the optimum magnitude of the survey ($i=10$), is around 2\,mmag. We detect 222 objects with plausible transit signals from these data, 116 of which are plausible transiting exoplanet candidates according to their stellar properties as given by the TESS Input Catalog \citep{Stassun17}, Gaia DR2 \citep{Gaia18} and TESS-HERMES spectroscopy \citep{Sharma18}. With the first data release from TESS expected in late 2018, this candidate list will be a timely for improving the rejection of potential false positives., Comment: 49 pages, 23 figures, 3 tables
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- 2018
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- View/download PDF
4. Exoplanets in the Antarctic Sky. I. The First Data Release of AST3-II (CHESPA) and New Found Variables within the Southern CVZ of TESS
- Author
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Zhang, Hui, Yu, Zhouyi, Liang, Ensi, Yang, Ming, Ashley, Michael CB, Cui, Xiangqun, Du, Fujia, Fu, Jianning, Gong, Xuefei, Gu, Bozhong, Hu, Yi, Jiang, Peng, Liu, Huigen, Lawrence, Jon, Liu, Qiang, Li, Xiaoyan, Li, Zhengyang, Ma, Bin, Mould, Jeremy, Shang, Zhaohui, Suntzeff, Nicholas B, Tao, Charling, Tian, Qiguo, Tinney, CG, Uddin, Syed A, Wang, Lifan, Wang, Songhu, Wang, Xiaofeng, Wei, Peng, Wright, Duncan, Wu, Xuefeng, Wittenmyer, Robert A, Xu, Lingzhe, Yang, Shi-hai, Yu, Ce, Yuan, Xiangyan, Zheng, Jessica, Zhou, Hongyan, Zhou, Ji-lin, and Zhu, Zhenxi
- Subjects
binaries: eclipsing ,catalogs ,planets and satellites: detection ,stars: variables: general ,surveys ,techniques: photometric ,astro-ph.IM ,astro-ph.EP ,astro-ph.SR ,Astronomical and Space Sciences ,Organic Chemistry ,Physical Chemistry (incl. Structural) ,Astronomy & Astrophysics - Abstract
© 2019. The American Astronomical Society. All rights reserved. Located at Dome A, the highest point of the Antarctic plateau, the Chinese Kunlun station is considered to be one of the best ground-based photometric sites because of its extremely cold, dry, and stable atmosphere. A target can be monitored from there for over 40 days without diurnal interruption during a polar winter. This makes Kunlun station a perfect site to search for short-period transiting exoplanets. Since 2008, an observatory has existed at Kunlun station, and three telescopes are working there. Using these telescopes, the AST3 project has been carried out over the last 6 yr with a search for transiting exoplanets as one of its key programs (CHESPA). In the austral winters of 2016 and 2017, a set of target fields in the southern continuous viewing zone (CVZ) of TESS were monitored by the AST3-II telescope. In this paper, we introduce the CHESPA and present the first data release containing photometry of 26,578 bright stars (). The best photometric precision at the optimum magnitude for the survey is around 2 mmag. To demonstrate the data quality, we also present a catalog of 221 variables with a brightness variation greater than 5 mmag from the 2016 data. Among these variables, 179 are newly identified periodic variables not listed in the AAVSO database (https://www.aavso.org/), and 67 are listed in the Candidate Target List. These variables will require careful attention to avoid false-positive signals when searching for transiting exoplanets. Dozens of new transiting exoplanet candidates will be released in a subsequent paper.
- Published
- 2019
5. Exoplanets in the Antarctic Sky. II. 116 Transiting Exoplanet Candidates Found by AST3-II (CHESPA) within the Southern CVZ of TESS
- Author
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Zhang, Hui, Yu, Zhouyi, Liang, Ensi, Yang, Ming, Ashley, Michael CB, Cui, Xiangqun, Du, Fujia, Fu, Jianning, Gong, Xuefei, Gu, Bozhong, Hu, Yi, Jiang, Peng, Liu, Huigen, Lawrence, Jon, Liu, Qiang, Li, Xiaoyan, Li, Zhengyang, Ma, Bin, Mould, Jeremy, Shang, Zhaohui, Suntzeff, Nicholas B, Tao, Charling, Tian, Qiguo, Tinney, CG, Uddin, Syed A, Wang, Lifan, Wang, Songhu, Wang, Xiaofeng, Wei, Peng, Wright, Duncan, Wu, Xuefeng, Wittenmyer, Robert A, Xu, Lingzhe, Yang, Shi-hai, Yu, Ce, Yuan, Xiangyan, Zheng, Jessica, Zhou, Hongyan, Zhou, Ji-lin, and Zhu, Zhenxi
- Subjects
binaries: eclipsing ,catalogs ,planets and satellites: detection ,stars: variables: general ,surveys ,techniques: photometric ,astro-ph.EP ,astro-ph.IM ,Astronomical and Space Sciences ,Organic Chemistry ,Physical Chemistry (incl. Structural) ,Astronomy & Astrophysics - Abstract
© 2019. The American Astronomical Society. All rights reserved. We report first results from the CHinese Exoplanet Searching Program from Antarctica (CHESPA) - a wide-field high-resolution photometric survey for transiting exoplanets carried out using telescopes of the AST3 (Antarctic Survey Telescopes times 3) project. There are now three telescopes (AST3-I, AST3-II, and CSTAR-II) operating at Dome A - the highest point on the Antarctic Plateau - in a fully automatic and remote mode to exploit the superb observing conditions of the site, and its long and uninterrupted polar nights. The search for transiting exoplanets is one of the key projects for AST3. During the austral winters of 2016 and 2017 we used the AST3-II telescope to survey a set of target fields near the southern ecliptic pole, falling within the continuous viewing zone of the TESS mission. The first data release of the 2016 data, including images, catalogs, and light curves of 26,578 bright stars (), was presented in Zhang et al. The best precision, as measured by the rms of the light curves at the optimum magnitude of the survey (), is around 2 mmag. We detect 222 objects with plausible transit signals from these data, 116 of which are plausible transiting exoplanet candidates according to their stellar properties as given by the TESS Input Catalog, Gaia DR2, and TESS-HERMES spectroscopy. With the first data release from TESS expected in late 2018, this candidate list will be timely for improving the rejection of potential false-positives.
- Published
- 2019
6. Extremely lower lasing threshold in Er3+/Yb3+ co-doped phosphate dual glass microspheres.
- Author
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Huang, Qing, Bai, Shengchuang, Zhuo, Haonan, Yu, Zhouyi, Gao, Yixiao, Dai, Shixun, Nie, Qiuhua, Yousef, El Sayed, Wang, Xunsi, and Wang, Rongping
- Subjects
INFRARED lasers ,LASER pumping ,PHOSPHATE glass ,OPTICAL fibers ,CONTRAST sensitivity (Vision) - Abstract
Erbium-doped glass microsphere laser systems hold significant promise in the applications of bio-medicine and optical fiber sensing. However, their development has been hindered by the relatively high laser pump threshold. In this study, we proposed a unique dual microsphere system where two microspheres are affixed to a single-mode fiber taper and achieved a remarkably low lasing threshold of 19 μW for single-mode laser emission at 1544 nm. This is in sharp contrast with the lasing threshold of 56 μW observed in single microspheres. Our findings represent a significant achievement in the development of low-threshold, compact infrared laser sources for emerging applications in photonics. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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7. Eclipsing Binaries From the CSTAR Project at Dome A, Antarctica
- Author
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Yang, Ming, Zhang, Hui, Wang, Songhu, Zhou, Ji-Lin, Zhou, Xu, Wang, Lingzhi, Wang, Lifan, Wittenmyer, R. A., Liu, Hui-Gen, Meng, Zeyang, Ashley, M. C. B., Storey, J. W. V., Bayliss, D., Tinney, Chris, Wang, Ying, Wu, Donghong, Liang, Ensi, Yu, Zhouyi, Fan, Zhou, Feng, Long-Long, Gong, Xuefei, Lawrence, J. S., Liu, Qiang, Luong-Van, D. M., Ma, Jun, Wu, Zhenyu, Yan, Jun, Yang, Huigen, Yang, Ji, Yuan, Xiangyan, Zhang, Tianmeng, Zhu, Zhenxi, and Zou, Hu
- Subjects
Astrophysics - Solar and Stellar Astrophysics ,Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
The Chinese Small Telescope ARray (CSTAR) has observed an area around the Celestial South Pole at Dome A since 2008. About $20,000$ light curves in the i band were obtained lasting from March to July, 2008. The photometric precision achieves about 4 mmag at i = 7.5 and 20 mmag at i = 12 within a 30 s exposure time. These light curves are analyzed using Lomb--Scargle, Phase Dispersion Minimization, and Box Least Squares methods to search for periodic signals. False positives may appear as a variable signature caused by contaminating stars and the observation mode of CSTAR. Therefore the period and position of each variable candidate are checked to eliminate false positives. Eclipsing binaries are removed by visual inspection, frequency spectrum analysis and locally linear embedding technique. We identify 53 eclipsing binaries in the field of view of CSTAR, containing 24 detached binaries, 8 semi-detached binaries, 18 contact binaries, and 3 ellipsoidal variables. To derive the parameters of these binaries, we use the Eclipsing Binaries via Artificial Intelligence (EBAI) method. The primary and the secondary eclipse timing variations (ETVs) for semi-detached and contact systems are analyzed. Correlated primary and secondary ETVs confirmed by false alarm tests may indicate an unseen perturbing companion. Through ETV analysis, we identify two triple systems (CSTAR J084612.64-883342.9 and CSTAR J220502.55-895206.7). The orbital parameters of the third body in CSTAR J220502.55-895206.7 are derived using a simple dynamical model., Comment: 41 pages, 12 figures; published online in ApJS
- Published
- 2015
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8. Exoplanets in the Antarctic Sky. III. Stellar Flares Found by AST3-II (CHESPA) within the Southern CVZ of TESS
- Author
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Liang, En-Si, primary, Zhang, Hui, additional, Yu, Zhouyi, additional, Yang, Ming, additional, Zhou, Ji-lin, additional, Ashley, Michael C. B., additional, Cui, Xiangqun, additional, Du, Fujia, additional, Fu, Jianning, additional, Gong, Xuefei, additional, Gu, Bozhong, additional, Hu, Lei, additional, Hu, Yi, additional, Jiang, Peng, additional, Liu, Huigen, additional, Lawrence, Jon, additional, Liu, Qiang, additional, Li, Xiaoyan, additional, Li, Zhengyang, additional, Ma, Bin, additional, Mould, Jeremy, additional, Shang, Zhaohui, additional, Sun, Tianrui, additional, Suntzeff, Nicholas B., additional, Tao, Charling, additional, Tian, Qiguo, additional, Tinney, C. G., additional, Uddin, Syed A., additional, Wang, Lifan, additional, Wang, Songhu, additional, Wang, Xiaofeng, additional, Wei, Peng, additional, Wright, Duncan, additional, Wu, Xuefeng, additional, Wittenmyer, Robert A., additional, Xu, Lingzhe, additional, Yang, Shihai, additional, Yu, Ce, additional, Yuan, Xiangyan, additional, Zheng, Jessica, additional, Zhou, Hongyan, additional, and Zhu, Zhenxi, additional
- Published
- 2020
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9. Exoplanets in the Antarctic Sky. IV. Dual-band Photometry of Variables Found by the CSTAR-II Commissioning Survey at the North Sky
- Author
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Zhu, Jiapeng, primary, Zhang, Hui, additional, Liang, En-Si, additional, Yu, Zhouyi, additional, Yang, Ming, additional, Zhou, Ji-lin, additional, Cui, Xiangqun, additional, Du, Fujia, additional, Gong, Xuefei, additional, Gu, Bozhong, additional, Hu, Lei, additional, Jiang, Peng, additional, Liu, Huigen, additional, Li, Xiaoyan, additional, Li, Zhengyang, additional, Mould, Jeremy, additional, Sun, Tianrui, additional, Suntzeff, Nicholas B., additional, Tao, Charling, additional, Tian, Qiguo, additional, Uddin, Syed A., additional, Wang, Lifan, additional, Wang, Songhu, additional, Wang, Xiaofeng, additional, Wei, Peng, additional, Wright, Duncan, additional, Wittenmyer, Robert A., additional, Xu, Lingzhe, additional, Yang, Shihai, additional, Yuan, Xiangyan, additional, Zhou, Hongyan, additional, Zhu, Zhenxi, additional, and Lu, Hongke, additional
- Published
- 2020
- Full Text
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10. ECLIPSING BINARIES FROM THE CSTAR PROJECT AT DOME A, ANTARCTICA
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Yang (杨明), Ming, primary, Zhang, Hui, additional, Wang, Songhu, additional, Zhou, Ji-Lin, additional, Zhou, Xu, additional, Wang, Lingzhi, additional, Wang, Lifan, additional, Wittenmyer, R. A., additional, Liu, Hui-Gen, additional, Meng, Zeyang, additional, Ashley, M. C. B., additional, Storey, J. W. V., additional, Bayliss, D., additional, Tinney, Chris, additional, Wang, Ying, additional, Wu, Donghong, additional, Liang, Ensi, additional, Yu, Zhouyi, additional, Fan, Zhou, additional, Feng, Long-Long, additional, Gong, Xuefei, additional, Lawrence, J. S., additional, Liu, Qiang, additional, Luong-Van, D. M., additional, Ma, Jun, additional, Wu, Zhenyu, additional, Yan, Jun, additional, Yang, Huigen, additional, Yang, Ji, additional, Yuan, Xiangyan, additional, Zhang, Tianmeng, additional, Zhu, Zhenxi, additional, and Zou, Hu, additional
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- 2015
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11. Autonomous control system and real-time simulation platform for UAV
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Zhang, Yan, primary, Zhou, Rui, additional, Yu, Zhouyi, additional, and Chen, Zongji, additional
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- 2006
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12. Mission planning algorithm for autonomous control system of unmanned air vehicle
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Yu, Zhouyi, primary, Zhou, Rui, additional, and Chen, Zongji, additional
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- 2003
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13. Autonomous control system and real-time simulation platform for UAV.
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Zhang, Yan, Zhou, Rui, Yu, Zhouyi, and Chen, Zongji
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- 2006
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14. Mission planning algorithm for autonomous control system of unmanned air vehicle.
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Yu, Zhouyi, Zhou, Rui, and Chen, Zongji
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- 2003
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