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572 results on '"Zhang, Tianmeng"'

151. A Rapid and Sensitive Detection Method for Pseudomonas aeruginosa Using Visualized Recombinase Polymerase Amplification and Lateral Flow Strip Technology

Author

Yang, Haitao, primary, Wang, Yan, additional, Yang, Qiankun, additional, Fan, Hui, additional, Wang, Lei, additional, Zhang, Tianmeng, additional, Li, Zhixing, additional, Liu, Gang, additional, Zhao, Panpan, additional, Wu, Huahua, additional, Dong, Jingquan, additional, and Liang, Wei, additional

Published
2021
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152. SN 2017fgc: A Fast-expanding Type Ia Supernova Exploded in Massive Shell Galaxy NGC 474

Author

Zeng, Xiangyun, primary, Wang, Xiaofeng, additional, Esamdin, Ali, additional, Pellegrino, Craig, additional, Burke, Jamison, additional, Stahl, Benjamin E., additional, Zheng, WeiKang, additional, Filippenko, Alexei V., additional, Howell, D. Andrew, additional, Sand, D. J., additional, Valenti, Stefano, additional, Mo, Jun, additional, Xi, Gaobo, additional, Liu, Jialian, additional, Zhang, Jujia, additional, Li, Wenxiong, additional, Iskandar, Abdusamatjan, additional, Zhang, Mengfan, additional, Lin, Han, additional, Sai, Hanna, additional, Xiang, Danfeng, additional, Wei, Peng, additional, Zhang, Tianmeng, additional, Reichart, D. E., additional, Brink, Thomas G., additional, McCully, Curtis, additional, Hiramatsu, Daichi, additional, Hosseinzadeh, Griffin, additional, Jeffers, Benjamin T., additional, Ross, Timothy W., additional, Stegman, Samantha, additional, Wang, Lifan, additional, Zhang, Jicheng, additional, and Ma, Shuo, additional

Published
2021
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153. NLRP3 inflammasome signal pathway involves in Vibrio harveyi-induced inflammatory response in murine peritoneal macrophages in vitro

Author

Yu, Guili, primary, Wang, Jinxin, additional, Zhang, Wei, additional, Yang, Qiankun, additional, Liu, Gang, additional, Wang, Lei, additional, Bello, Babatunde Kazeem, additional, Zhang, Xiao, additional, Zhang, Tianmeng, additional, Fan, Hui, additional, Zhao, Panpan, additional, Liang, Wei, additional, and Dong, Jingquan, additional

Published
2021
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154. ASASSN-14ms: The Most Energetic Known Explosion of a Type Ibn Supernova and Its Physical Origin

Author

Wang, Xiaofeng, primary, Lin, Weili, additional, Zhang, Jujia, additional, Zhang, Tianmeng, additional, Cai, Yongzhi, additional, Zhang, Kaicheng, additional, Filippenko, Alexei V., additional, Graham, Melissa, additional, Maeda, Keiichi, additional, Mo, Jun, additional, Xiang, Danfeng, additional, Xi, Gaobo, additional, Yan, Shengyu, additional, Wang, Lifan, additional, Wang, Lingjun, additional, Kawabata, Koji, additional, and Zhai, Qian, additional

Published
2021
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155. Can the Helium-detonation Model Explain the Observed Diversity of Type Ia Supernovae?

Author

Li, Wenxiong, Wang, Xiaofeng, Bulla, Mattia, Pan, Yen-Chen, Wang, Lifan, Mo, Jun, Zhang, Jujia, Wu, Chengyuan, Zhang, Jicheng, Zhang, Tianmeng, Xiang, Danfeng, Lin, Han, Sai, Hanna, Zhang, Xinghan, Chen, Zhihao, Yan, Shengyu, Li, Wenxiong, Wang, Xiaofeng, Bulla, Mattia, Pan, Yen-Chen, Wang, Lifan, Mo, Jun, Zhang, Jujia, Wu, Chengyuan, Zhang, Jicheng, Zhang, Tianmeng, Xiang, Danfeng, Lin, Han, Sai, Hanna, Zhang, Xinghan, Chen, Zhihao, and Yan, Shengyu

Abstract

We study a sample of 16 Type Ia supernovae (SNe Ia) having both spectroscopic and photometric observations within 2-3 days after the first light. The early B - V colors of such a sample tend to show a continuous distribution. For objects with normal ejecta velocity (NV), the C ii lambda 6580 feature is always visible in the early spectra, while it is absent or very weak in the high-velocity (HV) counterpart. Moreover, the velocities of the detached high-velocity features (HVFs) of the Ca II near-IR triplet (CaIR3) above the photosphere are found to be much higher in HV objects than in NV objects, with typical values exceeding 30,000 km s(-1) at 2-3 days. We further analyze the relation between the velocity shift of late-time [Fe II] lines (v([Fe II])) and host galaxy mass. We find that all HV objects have redshifted v([Fe II]), while NV objects have both blue- and redshifted v([Fe II]). It is interesting to point out that the objects with redshifted v([Fe II]) are all located in massive galaxies, implying that HV and a portion of NV objects may have similar progenitor metallicities and explosion mechanisms. We propose that, with a geometric/projected effect, the He-detonation model may account for the similarity in birthplace environment and the differences seen in some SNe Ia, including B - V colors, C II features, CaIR3 HVFs at early times, and v([Fe II]) in the nebular phase. Nevertheless, some features predicted by He-detonation simulation, such as the rapidly decreasing light curve, deviate from the observations, and some NV objects with blueshifted nebular v([Fe II]) may involve other explosion mechanisms., QC 20210510

Published
2021
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156. SN 2015bf: A fast declining type II supernova with flash-ionized signatures

Author

Lin, Han, primary, Wang, Xiaofeng, additional, Zhang, Jujia, additional, Lin, Weili, additional, Mo, Jun, additional, Filippenko, Alexei V, additional, Zheng, WeiKang, additional, Brown, Peter J, additional, Xiang, Danfeng, additional, Huang, Fang, additional, Cai, Yongzhi, additional, Zhang, Tianmeng, additional, Li, Xue, additional, Rui, Liming, additional, Zhang, Xinghan, additional, Sai, Hanna, additional, Zhao, Xulin, additional, Graham, Melissa L, additional, Shivvers, I, additional, Halevi, G, additional, Yuk, H, additional, and Brink, Thomas G, additional

Published
2021
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157. Optical and ultraviolet monitoring of the black hole X-ray binary MAXI J1820+070/ASASSN-18ey for 18 months

Author

Sai, Hanna, primary, Wang, Xiaofeng, additional, Wu, Jianfeng, additional, Lin, Jie, additional, Feng, Hua, additional, Zhang, Tianmeng, additional, Li, Wenxiong, additional, Zhang, Jujia, additional, Mo, Jun, additional, Sun, Tianrui, additional, Ehgamberdiev, Shuhrat A, additional, Mirzaqulov, Davron, additional, Rui, Liming, additional, Lin, Weili, additional, Zhao, Xulin, additional, Lin, Han, additional, Zhang, Jicheng, additional, Zhang, Xinghan, additional, Zhao, Yong, additional, Li, Xue, additional, Xiang, Danfeng, additional, Wang, Lingzhi, additional, and Wu, Chengyuan, additional

Published
2021
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160. The Peculiar Transient AT2018cow: A Possible Origin of a Type Ibn/IIn Supernova

Author

Xiang, Danfeng, primary, Wang, Xiaofeng, additional, Lin, Weili, additional, Mo, Jun, additional, Lin, Han, additional, Burke, Jamison, additional, Hiramatsu, Daichi, additional, Hosseinzadeh, Griffin, additional, Howell, D. Andrew, additional, McCully, Curtis, additional, Valenti, Stefan, additional, Vinkó, József, additional, Wheeler, J. Craig, additional, Ehgamberdiev, Shuhrat A., additional, Mirzaqulov, Davron, additional, Bódi, Attila, additional, Bognár, Zsófia, additional, Cseh, Borbála, additional, Hanyecz, Ottó, additional, Ignácz, Bernadett, additional, Kalup, Csilla, additional, Könyves-Tóth, Réka, additional, Kriskovics, Levente, additional, Ordasi, András, additional, Pál, András, additional, Sárneczky, Krisztián, additional, Seli, Bálint, additional, Szakáts, Róbert, additional, Arranz-Heras, T., additional, Benavides-Palencia, R., additional, Cejudo-Martínez, D., additional, De la Fuente-Fernández, P., additional, Escartín-Pérez, A., additional, la Cuesta, F. García-De, additional, González-Carballo, J. L., additional, González-Farfán, R., additional, Limón-Martínez, F., additional, Mantero, A., additional, Naves-Nogués, R., additional, Morales-Aimar, M., additional, Ruíz-Ruíz, V. R., additional, Soldán-Alfaro, F. C., additional, Valero-Pérez, J., additional, Violat-Bordonau, F., additional, Zhang, Tianmeng, additional, Zhang, Jujia, additional, Li, Xue, additional, Chen, Zhihao, additional, Sai, Hanna, additional, and Li, Wenxiong, additional

Published
2021
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161. SN 2017hpa: A Nearby Carbon-rich Type Ia Supernova with a Large Velocity Gradient

Author

Zeng, Xiangyun, primary, Wang, Xiaofeng, additional, Esamdin, Ali, additional, Pellegrino, Craig, additional, Zheng, WeiKang, additional, Zhang, Jujia, additional, Mo, Jun, additional, Li, Wenxiong, additional, Howell, D. Andrew, additional, Filippenko, Alexei V., additional, Lin, Han, additional, Brink, Thomas G., additional, Baron, Edward A., additional, Burke, Jamison, additional, DerKacy, James M., additional, McCully, Curtis, additional, Hiramatsu, Daichi, additional, Hosseinzadeh, Griffin, additional, Jeffers, Benjamin T., additional, Ross, Timothy W., additional, Stahl, Benjamin E., additional, Stegman, Samantha, additional, Valenti, Stefano, additional, Wang, Lifan, additional, Xiang, Danfeng, additional, Zhang, Jicheng, additional, and Zhang, Tianmeng, additional

Published
2021
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163. Can the Helium-detonation Model Explain the Observed Diversity of Type Ia Supernovae?

Author

Li, Wenxiong, primary, Wang, Xiaofeng, additional, Bulla, Mattia, additional, Pan, Yen-Chen, additional, Wang, Lifan, additional, Mo, Jun, additional, Zhang, Jujia, additional, Wu, Chengyuan, additional, Zhang, Jicheng, additional, Zhang, Tianmeng, additional, Xiang, Danfeng, additional, Lin, Han, additional, Sai, Hanna, additional, Zhang, Xinghan, additional, Chen, Zhihao, additional, and Yan, Shengyu, additional

Published
2021
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167. A New Transition Wolf–Rayet WN/C Star in the Milky Way

Author

Zhang, Wei, primary, Todt, Helge, additional, Wu, Hong, additional, Shi, Jianrong, additional, Hsia, Chih-Hao, additional, Wu, Yuzhong, additional, Wu, Chaojian, additional, Zhao, Yongheng, additional, Zhang, Tianmeng, additional, and Hou, Yonghui, additional

Published
2020
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168. SN 2018zd: an unusual stellar explosion as part of the diverse Type II Supernova landscape

Author

Zhang, Jujia, primary, Wang, Xiaofeng, additional, József, Vinkó, additional, Zhai, Qian, additional, Zhang, Tianmeng, additional, Filippenko, Alexei V, additional, Brink, Thomas G, additional, Zheng, WeiKang, additional, Wyrzykowski, Łukasz, additional, Mikołajczyk, Przemysław, additional, Huang, Fang, additional, Rui, Liming, additional, Mo, Jun, additional, Sai, Hanna, additional, Zhang, Xinhan, additional, Wang, Huijuan, additional, DerKacy, James M, additional, Baron, Eddie, additional, Sárneczky, K, additional, Bódi, A, additional, Csörnyei, G, additional, Hanyecz, O, additional, Ignácz, B, additional, Kalup, Cs, additional, Kriskovics, L, additional, Könyves-Tóth, R, additional, Ordasi, A, additional, Pál, A, additional, Sódor, Á, additional, Szakáts, R, additional, Vida, K, additional, and Zsidi, G, additional

Published
2020
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170. A Mysterious Ring in Dark Space?

Author

Zhang, Wei, primary, Yang, Fan, additional, Wu, Hong, additional, Wu, Chaojian, additional, Zou, Hu, additional, Zhang, Tianmeng, additional, Zhou, Xu, additional, Lei, Fengjie, additional, Jin, Junjie, additional, Zhou, Zhimin, additional, Nie, Jundan, additional, Ma, Jun, additional, and Wang, Jiali, additional

Published
2020
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171. Flash Ionization Signatures in the Type Ibn Supernova SN 2019uo

Author

Gangopadhyay, Anjasha, primary, Misra, Kuntal, additional, Hiramatsu, Daichi, additional, Wang, Shan-Qin, additional, Hosseinzadeh, Griffin, additional, Wang, Xiaofeng, additional, Valenti, Stefano, additional, Zhang, Jujia, additional, Howell, D. Andrew, additional, Arcavi, Iair, additional, Anupama, G. C., additional, Burke, Jamison, additional, Dastidar, Raya, additional, Itagaki, Koichi, additional, Kumar, Brajesh, additional, Kumar, Brijesh, additional, Li, Long, additional, McCully, Curtis, additional, Mo, Jun, additional, Pandey, Shashi Bhushan, additional, Pellegrino, Craig, additional, Sai, Hanna, additional, Sahu, D. K., additional, Sanwal, Pankaj, additional, Singh, Avinash, additional, Singh, Mridweeka, additional, Zhang, Jicheng, additional, Zhang, Tianmeng, additional, and Zhang, Xinhan, additional

Published
2020
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172. Evidence for Type Ia Supernova Diversity from Ultraviolet Observations with the Hubble Space Telescope

Author

Wang, Xiaofeng, Wang, Lifan, Filippenko, Alexei, Baron, Eddie, Kromer, Markus, Jack, Dennis, Zhang, Tianmeng, Aldering, Greg, Antilogus, Pierre, Arnett, W. David, Baade, Dietrich, Barris, Brian J, Benetti, Stefano, Bouchet, Patrice, Burrows, Adam S, Canal, Ramon, Cappellaro, Enrico, Carlberg, Raymond, di Carlo, Elisa, Challis, Peter, Crotts, Arlin, Danziger, John I, Della Valle, Massimo, and Holland, Stephen T

Subjects
Astronomy
Abstract

We present ultraviolet (UV) spectroscopy and photometry of four Type Ia supernovae (SNe 2004dt, 2004ef, 2005M, and 2005cf) obtained with the UV prism of the Advanced Camera for Surveys on the Hubble Space Telescope, This dataset provides unique spectral time series down to 2000 A. Significant diversity is seen in the near-maximum-light spectra (approx.2000-3500 A) for this small sample. The corresponding photometric data, together with archival data from Swift Ultraviolet/Optical Telescope observations, provide further evidence of increased dispersion in the UV emission with respect to the optical. The peak luminosities measured in the uvw lIF250W filter are found to correlate with the B-band light-curve shape parameter .(Delta)m15(B), but with much larger scatter relative to the correlation in the broad-band B band (e.g., approx. 0.4 mag versus approx. 0.2 mag for those with 0.8 <.(Delta)m15(B) < 1.7 mag). SN 2004dt is found as an outlier of this correlation (at> 3(sigma), being brighter than normal SNe Ia such as SN 2005cf by approx. 0,9 mag and approx. 2.0 mag in the uvwl1F250W and uvm2/F220W filters, respectively. We show that different progenitor metallicity or line-expansion velocities alone cannot explain such a large discrepancy. Viewing-angle effects, such as due to an asymmetric explosion, may have a significant influence on the flux emitted in the UV region. Detailed modeling is needed to disentangle and quantify the above effects

Published
2012

173. The Sloan Digital Sky Survey Reverberation Mapping Project: Initial C iv Lag Results from Four Years of Data

Author

Grier, C. J., primary, Shen, Yue, additional, Horne, Keith, additional, Brandt, W. N., additional, Trump, J. R., additional, Hall, P. B., additional, Kinemuchi, K., additional, Starkey, David, additional, Schneider, D. P., additional, Ho, Luis C., additional, Homayouni, Y., additional, Li, Jennifer I-Hsiu, additional, McGreer, Ian D., additional, Peterson, B. M., additional, Bizyaev, Dmitry, additional, Chen, Yuguang, additional, Dawson, K. S., additional, Eftekharzadeh, Sarah, additional, Guo, Yucheng, additional, Jia, Siyao, additional, Jiang, Linhua, additional, Kneib, Jean-Paul, additional, Li, Feng, additional, Li, Zefeng, additional, Nie, Jundan, additional, Oravetz, Audrey, additional, Oravetz, Daniel, additional, Pan, Kaike, additional, Petitjean, Patrick, additional, Ponder, Kara A., additional, Rogerson, Jesse, additional, Vivek, M., additional, Zhang, Tianmeng, additional, and Zou, Hu, additional

Published
2019
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174. Seeing Double:ASASSN-18bt Exhibits a two-component Rise in the Early-Time K2 Light Curve

Author

Shappee, B. J., Holoien, T. W. -s., Drout, M. R., Auchettl, K., Stritzinger, M. D., Kochanek, C. S., Stanek, K. Z., Shaya, E., Narayan, G., Brown, J. S., Bose, S., Bersier, D., Brimacombe, J., Chen, Ping, Dong, Subo, Holmbo, S., Katz, B., Munnoz, J. A., Mutel, R. L., Post, R. S., Prieto, J. L., Shields, J., Tallon, D., Thompson, T. A., Vallely, P. J., Jr, S. Villanueva, Denneau, L., Flewelling, H., Heinze, A. N., Smith, K. W., Stalder, B., Tonry, J. L., Weiland, H., Barclay, T., Barentsen, G., Cody, A. M., Dotson, J., Foerster, F., Garnavich, P., Gully-santiago, M., Hedges, C., Howell, S., Kasen, D., Margheim, S., Mushotzky, R., Rest, A., Tucker, B. E., Villar, A., Zenteno, A., Beerman, G., Bjella, R., Castillo, G., Coughlin, J., Elsaesser, B., Flynn, S., Gangopadhyay, R., Griest, K., Hanley, M., Kampmeier, J., Kloetzel, R., Kohnert, L., Labonde, C., Larsen, R., Larson, K. A., Mccalmont-everton, K. M., Mcginn, C., Migliorini, L., Moffatt, J., Muszynski, M., Nystrom, V., Osborne, D., Packard, M., Peterson, C. A., Redick, M., Reedy, L. H., Spencer, B., Steward, K., Cleve, J. E. Van, Cardoso, J. Vinicius De Miranda, Weschler, T., Wheaton, A., Bulger, J., Lowe, T. B., Magnier, E. A., Waters, C. Z., Willman, M., Baron, Eddie, Chen, Zhihao, Derkacy, James M., Huang, Fang, Li, Linyi, Li, Wenxiong, Li, Xue, Rui, Liming, Sai, Hanna, Wang, Lifan, Wang, Lingzhi, Wang, Xiaofeng, Xiang, Danfeng, Zhang, Jicheng, Zhang, Jujia, Zhang, Kaicheng, Zhang, Tianmeng, Zhang, Xinghan, Zhao, Xulin, Brown, P. J., Hermes, J. J., Nordin, J., Points, S., and Strampelli, G. M.

Subjects
astro-ph.HE
Abstract

On 2018 Feb. 4.41, the All-Sky Automated Survey for SuperNovae (ASAS-SN) discovered ASASSN-18bt in the K2 Campaign 16 field. With a redshift of $z=0.010981$ and a peak apparent magnitude of $B_{max}=14.31$, ASASSN-18bt is the nearest and brightest SNe Ia yet observed by the Kepler spacecraft. Here we present the discovery of ASASSN-18bt, the K2 light curve, and pre-discovery data from ASAS-SN and the Asteroid Terrestrial-impact Last Alert System (ATLAS). The K2 early-time light curve has an unprecedented cadence and photometric precision for an SN Ia light curve, and it unambiguously shows a 4 day nearly linear phase followed by a steeper rise. Thus, ASASSN-18bt joins a growing list of SNe Ia whose early light curves are not well described by a single power law. We show that a double-power-law model fits the data reasonably well, hinting that two physical processes must be responsible for the observed rise. However, we find that current models of the interaction with a non-degenerate companion predict an abrupt rise and cannot adequately explain the initial, slower linear phase. Instead, we find that existing, published models with shallow $^{56}$Ni are able to span the observed behavior and, with tuning, may be able to reproduce the ASASSN-18bt light curve. Regardless, more theoretical work is needed to satisfactorily model this and other early-time SNe~Ia light curves. Finally, we use Swift X-ray non-detections to constrain the presence of CSM at much larger distances and lower densities than possible with the optical light curve. Assuming a wind-like environment, the observed X-ray limit corresponds to a mass-loss limit of $\dot M

Published
2019

177. Space-efficient and high-performance inline deduplication for emerging hybrid storage system with Libra＋.

Author

Chen, Renhui, Zhang, Tianmeng, Li, Zijing, Gao, Congming, Zhang, Youtao, Li, Qiao, Yang, Jun, and Shu, Jiwu

Subjects
*SOLID state drives, *CACHE memory, *OVERHEAD costs, *COST control, *DATA reduction, *SYSTEMS design
Abstract

In the face of the ever-increasing data volume of data-intensive applications, deduplication, as a promising solution to reduce space consumption, has attracted increasing attention in modern storage systems. Specifically, in modern SSD caching-based hybrid storage systems, inline deduplication achieves data reduction on the fly before storing data in the SSDs, thereby enhancing performance and extending their lifespan. However, with the emergence of new storage media featuring fast access speed and high endurance, hybrid storage systems have evolved by incorporating these new storage devices in place of SSDs at the front end of the primary storage. In this work, we revisit the concept of inline deduplication in the context of emerging hybrid storage and propose a new inline deduplication system designed for emerging hybrid storage, named Libra ＋. Libra＋ contains three components: First, we propose two cooperative index structures for memory and cache. Second, we design a selective deduplication approach to perform targeted deduplication. Third, we introduce a lightweight dirty list that replaces the conventional dirty list in inline deduplication, reducing time overhead and space costs. Experimental results show that Libra＋ can achieve simultaneous performance improvement and space cost reduction. [ABSTRACT FROM AUTHOR]

Published
2024
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178. A wide star–black-hole binary system from radial-velocity measurements

Author

Liu, Jifeng, primary, Zhang, Haotong, additional, Howard, Andrew W., additional, Bai, Zhongrui, additional, Lu, Youjun, additional, Soria, Roberto, additional, Justham, Stephen, additional, Li, Xiangdong, additional, Zheng, Zheng, additional, Wang, Tinggui, additional, Belczynski, Krzysztof, additional, Casares, Jorge, additional, Zhang, Wei, additional, Yuan, Hailong, additional, Dong, Yiqiao, additional, Lei, Yajuan, additional, Isaacson, Howard, additional, Wang, Song, additional, Bai, Yu, additional, Shao, Yong, additional, Gao, Qing, additional, Wang, Yilun, additional, Niu, Zexi, additional, Cui, Kaiming, additional, Zheng, Chuanjie, additional, Mu, Xiaoyong, additional, Zhang, Lan, additional, Wang, Wei, additional, Heger, Alexander, additional, Qi, Zhaoxiang, additional, Liao, Shilong, additional, Lattanzi, Mario, additional, Gu, Wei-Min, additional, Wang, Junfeng, additional, Wu, Jianfeng, additional, Shao, Lijing, additional, Shen, Rongfeng, additional, Wang, Xiaofeng, additional, Bregman, Joel, additional, Di Stefano, Rosanne, additional, Liu, Qingzhong, additional, Han, Zhanwen, additional, Zhang, Tianmeng, additional, Wang, Huijuan, additional, Ren, Juanjuan, additional, Zhang, Junbo, additional, Zhang, Jujia, additional, Wang, Xiaoli, additional, Cabrera-Lavers, Antonio, additional, Corradi, Romano, additional, Rebolo, Rafael, additional, Zhao, Yongheng, additional, Zhao, Gang, additional, Chu, Yaoquan, additional, and Cui, Xiangqun, additional

Published
2019
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179. The Third Data Release of the Beijing–Arizona Sky Survey

Author

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

Published
2019
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180. The Sloan Digital Sky Survey Reverberation Mapping Project: Improving Lag Detection with an Extended Multiyear Baseline

Author

Shen, Yue, primary, Grier, C. J., additional, Horne, Keith, additional, Brandt, W. N., additional, Trump, J. R., additional, Hall, P. B., additional, Kinemuchi, K., additional, Starkey, David, additional, Schneider, D. P., additional, Ho, Luis C., additional, Homayouni, Y., additional, Li, Jennifer I-Hsiu, additional, McGreer, Ian D., additional, Peterson, B. M., additional, Bizyaev, Dmitry, additional, Chen, Yuguang, additional, Dawson, K. S., additional, Eftekharzadeh, Sarah, additional, Green, P. J., additional, Guo, Yucheng, additional, Jia, Siyao, additional, Jiang, Linhua, additional, Kneib, Jean-Paul, additional, Li, Feng, additional, Li, Zefeng, additional, Nie, Jundan, additional, Oravetz, Audrey, additional, Oravetz, Daniel, additional, Pan, Kaike, additional, Petitjean, Patrick, additional, Ponder, Kara A., additional, Rogerson, Jesse, additional, Vivek, M., additional, Zhang, Tianmeng, additional, and Zou, Hu, additional

Published
2019
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181. Observations of Type Ia Supernova 2014J for Nearly 900 Days and Constraints on Its Progenitor System

Author

Li, Wenxiong, primary, Wang, Xiaofeng, additional, Hu, Maokai, additional, Yang, Yi, additional, Zhang, Jujia, additional, Mo, Jun, additional, Chen, Zhihao, additional, Zhang, Tianmeng, additional, Benetti, Stefano, additional, Cappellaro, Enrico, additional, Elias-Rosa, Nancy, additional, Isern, Jordi, additional, Morales-Garoffolo, Antonia, additional, Huang, Fang, additional, Ochner, Paolo, additional, Pastorello, Andrea, additional, Reguitti, Andrea, additional, Tartaglia, Leonardo, additional, Terreran, Giacomo, additional, Tomasella, Lina, additional, and Wang, Lifan, additional

Published
2019
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182. Overview of the DESI Legacy Imaging Surveys

Author

Dey, Arjun, primary, Schlegel, David J., additional, Lang, Dustin, additional, Blum, Robert, additional, Burleigh, Kaylan, additional, Fan, Xiaohui, additional, Findlay, Joseph R., additional, Finkbeiner, Doug, additional, Herrera, David, additional, Juneau, Stéphanie, additional, Landriau, Martin, additional, Levi, Michael, additional, McGreer, Ian, additional, Meisner, Aaron, additional, Myers, Adam D., additional, Moustakas, John, additional, Nugent, Peter, additional, Patej, Anna, additional, Schlafly, Edward F., additional, Walker, Alistair R., additional, Valdes, Francisco, additional, Weaver, Benjamin A., additional, Yèche, Christophe, additional, Zou, Hu, additional, Zhou, Xu, additional, Abareshi, Behzad, additional, Abbott, T. M. C., additional, Abolfathi, Bela, additional, Aguilera, C., additional, Alam, Shadab, additional, Allen, Lori, additional, Alvarez, A., additional, Annis, James, additional, Ansarinejad, Behzad, additional, Aubert, Marie, additional, Beechert, Jacqueline, additional, Bell, Eric F., additional, BenZvi, Segev Y., additional, Beutler, Florian, additional, Bielby, Richard M., additional, Bolton, Adam S., additional, Briceño, César, additional, Buckley-Geer, Elizabeth J., additional, Butler, Karen, additional, Calamida, Annalisa, additional, Carlberg, Raymond G., additional, Carter, Paul, additional, Casas, Ricard, additional, Castander, Francisco J., additional, Choi, Yumi, additional, Comparat, Johan, additional, Cukanovaite, Elena, additional, Delubac, Timothée, additional, DeVries, Kaitlin, additional, Dey, Sharmila, additional, Dhungana, Govinda, additional, Dickinson, Mark, additional, Ding, Zhejie, additional, Donaldson, John B., additional, Duan, Yutong, additional, Duckworth, Christopher J., additional, Eftekharzadeh, Sarah, additional, Eisenstein, Daniel J., additional, Etourneau, Thomas, additional, Fagrelius, Parker A., additional, Farihi, Jay, additional, Fitzpatrick, Mike, additional, Font-Ribera, Andreu, additional, Fulmer, Leah, additional, Gänsicke, Boris T., additional, Gaztanaga, Enrique, additional, George, Koshy, additional, Gerdes, David W., additional, A Gontcho, Satya Gontcho, additional, Gorgoni, Claudio, additional, Green, Gregory, additional, Guy, Julien, additional, Harmer, Diane, additional, Hernandez, M., additional, Honscheid, Klaus, additional, Huang, Lijuan (Wendy), additional, James, David J., additional, Jannuzi, Buell T., additional, Jiang, Linhua, additional, Joyce, Richard, additional, Karcher, Armin, additional, Karkar, Sonia, additional, Kehoe, Robert, additional, Kneib, Jean-Paul,, additional, Kueter-Young, Andrea, additional, Lan, Ting-Wen, additional, Lauer, Tod R., additional, Guillou, Laurent Le, additional, Van Suu, Auguste Le, additional, Lee, Jae Hyeon, additional, Lesser, Michael, additional, Levasseur, Laurence Perreault, additional, Li, Ting S., additional, Mann, Justin L., additional, Marshall, Robert, additional, Martínez-Vázquez, C. E., additional, Martini, Paul, additional, du Mas des Bourboux, Hélion, additional, McManus, Sean, additional, Meier, Tobias Gabriel, additional, Ménard, Brice, additional, Metcalfe, Nigel, additional, Muñoz-Gutiérrez, Andrea, additional, Najita, Joan, additional, Napier, Kevin, additional, Narayan, Gautham, additional, Newman, Jeffrey A., additional, Nie, Jundan, additional, Nord, Brian, additional, Norman, Dara J., additional, Olsen, Knut A. G., additional, Paat, Anthony, additional, Palanque-Delabrouille, Nathalie, additional, Peng, Xiyan, additional, Poppett, Claire L., additional, Poremba, Megan R., additional, Prakash, Abhishek, additional, Rabinowitz, David, additional, Raichoor, Anand, additional, Rezaie, Mehdi, additional, Robertson, A. N., additional, Roe, Natalie A., additional, Ross, Ashley J., additional, Ross, Nicholas P., additional, Rudnick, Gregory, additional, Safonova, Sasha, additional, Saha, Abhijit, additional, Sánchez, F. Javier, additional, Savary, Elodie, additional, Schweiker, Heidi, additional, Scott, Adam, additional, Seo, Hee-Jong, additional, Shan, Huanyuan, additional, Silva, David R., additional, Slepian, Zachary, additional, Soto, Christian, additional, Sprayberry, David, additional, Staten, Ryan, additional, Stillman, Coley M., additional, Stupak, Robert J., additional, Summers, David L., additional, Tie, Suk Sien, additional, Tirado, H., additional, Vargas-Magaña, Mariana, additional, Vivas, A. Katherina, additional, Wechsler, Risa H., additional, Williams, Doug, additional, Yang, Jinyi, additional, Yang, Qian, additional, Yapici, Tolga, additional, Zaritsky, Dennis, additional, Zenteno, A., additional, Zhang, Kai, additional, Zhang, Tianmeng, additional, Zhou, Rongpu, additional, and Zhou, Zhimin, additional

Published
2019
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185. Observations of a Fast-expanding and UV-bright Type Ia Supernova SN 2013gs

Author

Zhang, Tianmeng, primary, Wang, Xiaofeng, additional, Zhao, Xulin, additional, Xu, Dong, additional, Reguitti, Andrea, additional, Zhang, Jujia, additional, Pastorello, Andrea, additional, Tomasella, Lina, additional, Ochner, Paolo, additional, Tartaglia, Leonardo, additional, Benetti, Stefano, additional, Turatto, Massimo, additional, Harutyunyan, Avet, additional, Elias-Rosa, Nancy, additional, Huang, Fang, additional, Zhang, Kaicheng, additional, Chen, Juncheng, additional, Jiang, Zhaoji, additional, Ma, Jun, additional, Nie, Jundan, additional, Peng, Xiyan, additional, Zhou, Xu, additional, Zhou, Zhimin, additional, and Zou, Hu, additional

Published
2019
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186. Observations of SN 2017ein Reveal Shock Breakout Emission and a Massive Progenitor Star for a Type Ic Supernova

Author

Xiang, Danfeng, primary, Wang, Xiaofeng, additional, Mo, Jun, additional, Wang, Lingjun, additional, Smartt, Stephen, additional, Fraser, Morgan, additional, Ehgamberdiev, Shuhrat A., additional, Mirzaqulov, Davron, additional, Zhang, Jujia, additional, Zhang, Tianmeng, additional, Vinko, Jozsef, additional, Wheeler, J. Craig, additional, Hosseinzadeh, Griffin, additional, Howell, D. Andrew, additional, McCully, Curtis, additional, DerKacy, James M, additional, Baron, E., additional, Brown, Peter, additional, Zhang, Xianfei, additional, Bi, Shaolan, additional, Song, Hao, additional, Zhang, Kaicheng, additional, Rest, A., additional, Nomoto, Ken’ichi, additional, Tolstov, Alexey, additional, and Blinnikov, Sergei, additional

Published
2019
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187. SN 2014J in M82 : new insights on the spectral diversity of Type Ia supernovae

Author

Zhang, Kaicheng, Wang, Xiaofeng, Zhang, Jujia, Zhang, Tianmeng, Benetti, S., Elias-Rosa, N., Huang, Fang, Lin, Han, Li, Linyi, Li, Wenxiong, Ochner, P., Pastorello, A., Rui, Liming, Tartaglia, Leonardo, Tomasella, L., Siviero, A., Munari, U., Terreran, G., Song, Hao, Taubenberger, S., Wheeler, J. Craig, Xiang, Danfeng, Zhao, Xulin, Li, Hongbin, Bai, Jinming, Jiang, Xiaojun, Shi, Jianrong, Wu, Zhenyu, Zhang, Kaicheng, Wang, Xiaofeng, Zhang, Jujia, Zhang, Tianmeng, Benetti, S., Elias-Rosa, N., Huang, Fang, Lin, Han, Li, Linyi, Li, Wenxiong, Ochner, P., Pastorello, A., Rui, Liming, Tartaglia, Leonardo, Tomasella, L., Siviero, A., Munari, U., Terreran, G., Song, Hao, Taubenberger, S., Wheeler, J. Craig, Xiang, Danfeng, Zhao, Xulin, Li, Hongbin, Bai, Jinming, Jiang, Xiaojun, Shi, Jianrong, and Wu, Zhenyu

Abstract

We present extensive spectroscopic observations for one of the closest Type Ia supernovae (SNe Ia), SN 2014J discovered in M82, ranging from 10.4 d before to 473.2 d after B-band maximum light. The diffuse interstellar band features detected in a high-resolution spectrum allow an estimate of line-of-sight extinction as A(v) similar to 1.9 +/- 0.6 mag. Spectroscopically, SN 2014J can be put into the high-velocity (HV) subgroup in Wang's classification with a velocity of Si II lambda 6355 at maximum light of upsilon(0) = 1.22 +/- 0.01 x 10(4) km s(-1) but has a low velocity gradient (LVG, following Benetti's classification) of (v) over bar = 41 +/- 2 km s(-1) d(-1), which is inconsistent with the trend that HV SNe Ia generally have larger velocity gradients. We find that the HV SNe Ia with LVGs tend to have relatively stronger Si III (at similar to 4400 angstrom) absorptions in early spectra, larger ratios of S II lambda 5468 to S II lambda 5640, and weaker Si II 5972 absorptions compared to their counterparts with similar velocities but high velocity gradients. This shows that the HV+ LVG subgroup of SNe Ia may have intrinsically higher photospheric temperature, which indicates that their progenitors may experience more complete burning in the explosions relative to the typical HV SNe Ia.

Published
2018
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188. Short-lived Circumstellar Interaction in the Low-luminosity Type IIP SN 2016bkv

Author

Hosseinzadeh, Griffin, Valenti, Stefano, McCully, Curtis, Howell, D. Andrew, Arcavi, Iair, Jerkstrand, Anders, Guevel, David, Tartaglia, Leonardo, Rui, Liming, Mo, Jun, Wang, Xiaofeng, Huang, Fang, Song, Hao, Zhang, Tianmeng, Itagaki, Koichi, Hosseinzadeh, Griffin, Valenti, Stefano, McCully, Curtis, Howell, D. Andrew, Arcavi, Iair, Jerkstrand, Anders, Guevel, David, Tartaglia, Leonardo, Rui, Liming, Mo, Jun, Wang, Xiaofeng, Huang, Fang, Song, Hao, Zhang, Tianmeng, and Itagaki, Koichi

Abstract

While interaction with circumstellar material is known to play an important role in Type. IIn supernovae (SNe), analyses of the more common SNe IIP and IIL have not traditionally included interaction as a significant power source. However, recent campaigns to observe SNe within days of explosion have revealed narrow emission lines of high-ionization species in the earliest spectra of luminous SNe II of all subclasses. These flash ionization features indicate the presence of a confined shell of material around the progenitor star. Here we present the first low-luminosity (LL) SN to show flash ionization features, SN 2016bkv. This SN peaked at M-V = -16 mag and has Ha expansion velocities under 1350 km s(-1) around maximum light, placing it at the faint/slow end of the distribution of SNe IIP (similar to SN 2005cs). The light-curve shape of SN 2016bkv is also extreme among SNe IIP. A very strong initial peak could indicate additional luminosity from circumstellar interaction. A very small fall from the plateau to the nickel tail indicates unusually large production of radioactive nickel compared to other LL SNe IIP. A comparison between nebular spectra of SN. 2016bkv and models raises the possibility that SN. 2016bkv is an electron-capture supernova.

Published
2018
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189. Observations of SN 2017ein Reveal Shock Breakout Emission and A Massive Progenitor Star for a Type Ic Supernova

Author

Xiang, Danfeng, Wang, Xiaofeng, Mo, Jun, Wang, Lingjun, Smartt, Stephen, Fraser, Morgan, Ehgamberdiev, Shuhrat A., Mirzaqulov, Davron, Zhang, Jujia, Zhang, Tianmeng, Vinko, Jozsef, Wheeler, J. Craig, Hosseinzadeh, Griffin, Howell, D. Andrew, McCully, Curtis, DerKacy, James M, Baron, E., Brown, Peter, Zhang, Xianfei, Bi, Shaolan, Song, Hao, Zhang, Kaicheng, Rest, A., Nomoto, Ken'ichi, Tolstov, Alexey, Blinnikov, Sergei, Xiang, Danfeng, Wang, Xiaofeng, Mo, Jun, Wang, Lingjun, Smartt, Stephen, Fraser, Morgan, Ehgamberdiev, Shuhrat A., Mirzaqulov, Davron, Zhang, Jujia, Zhang, Tianmeng, Vinko, Jozsef, Wheeler, J. Craig, Hosseinzadeh, Griffin, Howell, D. Andrew, McCully, Curtis, DerKacy, James M, Baron, E., Brown, Peter, Zhang, Xianfei, Bi, Shaolan, Song, Hao, Zhang, Kaicheng, Rest, A., Nomoto, Ken'ichi, Tolstov, Alexey, and Blinnikov, Sergei

Abstract

We present optical and ultraviolet observations of nearby type Ic supernova SN 2017ein as well as detailed analysis of its progenitor properties from both the early-time observations and the prediscovery Hubble Space Telescope (HST) images. The optical light curves started from within one day to $\sim$275 days after explosion, and optical spectra range from $\sim$2 days to $\sim$90 days after explosion. Compared to other normal SNe Ic like SN 2007gr and SN 2013ge, \mbox{SN 2017ein} seems to have more prominent C{\footnotesize II} absorption and higher expansion velocities in early phases, suggestive of relatively lower ejecta mass. The earliest photometry obtained for \mbox{SN 2017ein} show indications of shock cooling. The best-fit obtained by including a shock cooling component gives an estimate of the envelope mass as $\sim$0.02 M$_{\odot}$ and stellar radius as 8$\pm$4 R$_{\odot}$. Examining the pre-explosion images taken with the HST WFPC2, we find that the SN position coincides with a luminous and blue point-like source, with an extinction-corrected absolute magnitude of M$_V$$\sim$$-$8.2 mag and M$_I$$\sim$$-$7.7 mag.Comparisons of the observations to the theoretical models indicate that the counterpart source was either a single WR star or a binary with whose members had high initial masses, or a young compact star cluster. To further distinguish between different scenarios requires revisiting the site of the progenitor with HST after the SN fades away., Comment: 28 pages, 19 figures; accepted for publication in The Astrophysical Journal

Published
2018
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190. Optical Observations of the Young Type Ic Supernova SN 2014L in M99

Author

Zhang, Jujia, Wang, Xiaofeng, Vinkó, József, Wheeler, J. Craig, Chang, Liang, Yang, Yi, Wang, Lifan, Zhai, Qian, Rui, Liming, Mo, Jun, Zhang, Tianmeng, Zhang, Yu, Wang, Jianguo, Mao, Jirong, Wang, Chuanjun, Yi, Weimin, Xin, Yuxin, Li, Wenxiong, Lun, Baoli, Lu, Kaixing, Sai, Hanna, Zheng, Xiangming, Zhang, Xiliang, Zhou, Xu, Bai, Jinming, Zhang, Jujia, Wang, Xiaofeng, Vinkó, József, Wheeler, J. Craig, Chang, Liang, Yang, Yi, Wang, Lifan, Zhai, Qian, Rui, Liming, Mo, Jun, Zhang, Tianmeng, Zhang, Yu, Wang, Jianguo, Mao, Jirong, Wang, Chuanjun, Yi, Weimin, Xin, Yuxin, Li, Wenxiong, Lun, Baoli, Lu, Kaixing, Sai, Hanna, Zheng, Xiangming, Zhang, Xiliang, Zhou, Xu, and Bai, Jinming

Abstract

We present optical spectroscopic and photometric observations of the nearby type Ic supernova (SN Ic) SN 2014L. This SN was discovered by the Tsinghua-NAOC Transient Survey (TNTS) in the nearby type-Sc spiral galaxy M99 (NGC 4254). Fitting to the early-time light curve indicates that SN 2014L was detected at only a few hours after the shock breakout, and it reached a peak brightness of $M_{\rm V} = -17.73 \pm 0.28$ mag ($L= [2.06\pm 0.50] \times 10^{42}$ erg s$^{-1}$) approximately 13 days later. SN 2014L shows a close resemblance to SN 2007gr in the photometric evolution, while it shows stronger absorption features of intermediate-mass elements (especially \CaII) in the early-time spectra. Based on simple modeling of the observed light curves, we derived the mass of synthesized $^{56}$Ni as $M_{\rm Ni} = 0.075 \pm 0.025 M_{\odot}$, and the mass and total energy of the ejecta as $M_{\rm ej} = 1.00 \pm 0.20 M_\odot$ and $E_{\rm ej}=1.45\pm0.25$ foe, respectively. Given these typical explosion parameters, the early detection, and the extensive observations, we suggest that SN 2014L could be a template sample for the investigation of SNe Ic., Comment: 14 pages, 12 figures, accepted for publication in ApJ

Published
2018
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191. Optical Observations of the 2002cx-like Supernova 2014ek, and Characterizations of SNe Iax

Author

Li, Linyi, Wang, Xiaofeng, Zhang, Jujia, Arcavi, Iair, Zhang, Tianmeng, Rui, Liming, Hosseinzadeh, Griffin, Howell, D. Andrew, McCully, Curtis, Zhang, Kaicheng, Valenti, Stefano, Mo, Jun, Li, Wenxiong, Huang, Fang, Xiang, Danfeng, Wang, Lifan, Zhou, Xu, Li, Linyi, Wang, Xiaofeng, Zhang, Jujia, Arcavi, Iair, Zhang, Tianmeng, Rui, Liming, Hosseinzadeh, Griffin, Howell, D. Andrew, McCully, Curtis, Zhang, Kaicheng, Valenti, Stefano, Mo, Jun, Li, Wenxiong, Huang, Fang, Xiang, Danfeng, Wang, Lifan, and Zhou, Xu

Abstract

We present optical observations of supernova (SN) 2014ek discovered during the Tsinghua-NAOC Transient Survey (TNTS), which shows properties that are consistent with those of SN 2002cx-like events (dubbed as SNe Iax). The photometry indicates that it is underluminous compared to normal SNe Ia, with the absolute $V$-band peak magnitude being as $-17.66\pm0.20$ mag. The spectra are characterized by highly ionized Fe III and intermediate-mass elements (IMEs). The expansion velocity of the ejecta is found to be $\sim$5000 km s$^{-1}$ near the maximum light, only half of that measured for normal SNe Ia. The overall spectral evolution is quite similar to SN 2002cx and SN 2005hk, while the absorption features of the main IMEs seem to be relatively weaker. The ${}^{56}$Ni mass synthesized in the explosion is estimated to be about 0.08 M$_{\odot}$ from the pseudo bolometric light curve. Based on a large sample of SNe Iax, we examined the relations between peak luminosity, ejecta velocity, decline rate, and peak $V - R$ color but did not find noticeable correlations between these observables, in particular when a few extreme events like SN 2008ha are excluded in the analysis. For this sample, we also studied the birthplace environments and confirm that they still hold the trend of occurring preferentially in late-type spiral galaxies. Moreover, SNe Iax tend to occur in large star-forming regions of their host galaxies, more similar to SNe Ibc than SNe II, favoring that their progenitors should be associated with very young stellar populations., Comment: 15 pages, 14 figures, published on Monthly Notices of the Royal Astronomical Society

Published
2018
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192. Seeing Double: ASASSN-18bt Exhibits a Two-Component Rise in the Early-Time K2 Light Curve

Author

Shappee, B. J., Holoien, T. W. -s., Drout, M. R., Auchettl, K., Stritzinger, M. D., Kochanek, C. S., Stanek, K. Z., Shaya, E., Narayan, G., Brown, J. S., Bose, S., Bersier, D., Brimacombe, J., Chen, Ping, Dong, Subo, Holmbo, S., Katz, B., Munnoz, J. A., Mutel, R. L., Post, R. S., Prieto, J. L., Shields, J., Tallon, D., Thompson, T. A., Vallely, P. J., Villanueva Jr., S., Denneau, L., Flewelling, H., Heinze, A. N., Smith, K. W., Stalder, B., Tonry, J. L., Weiland, H., Barclay, T., Barentsen, G., Cody, A. M., Dotson, J., Foerster, F., Garnavich, P., Gully-santiago, M., Hedges, C., Howell, S., Kasen, D., Margheim, S., Mushotzky, R., Rest, A., Tucker, B. E., Villar, A., Zenteno, A., Beerman, G., Bjella, R., Castillo, G., Coughlin, J., Elsaesser, B., Flynn, S., Gangopadhyay, R., Griest, K., Hanley, M., Kampmeier, J., Kloetzel, R., Kohnert, L., Labonde, C., Larsen, R., Larson, K. A., Mccalmont-everton, K. M., Mcginn, C., Migliorini, L., Moffatt, J., Muszynski, M., Nystrom, V., Osborne, D., Packard, M., Peterson, C. A., Redick, M., Reedy, L. H., Ross, S. E., Spencer, B., Steward, K., Van Cleve, J. E., Cardoso, J. Vinicius De Miranda, Weschler, T., Wheaton, A., Bulger, J., Lowe, T. B., Magnier, E. A., Schultz, A. S. B., Waters, C. Z., Willman, M., Baron, Eddie, Chen, Zhihao, Derkacy, James M., Huang, Fang, Li, Linyi, Li, Wenxiong, Li, Xue, Rui, Liming, Sai, Hanna, Wang, Lifan, Wang, Lingzhi, Wang, Xiaofeng, Xiang, Danfeng, Zhang, Jicheng, Zhang, Jujia, Zhang, Kaicheng, Zhang, Tianmeng, Zhang, Xinghan, Zhao, Xulin, Brown, P. J., Hermes, J. J., Nordin, J., Points, S., Strampelli, G. M., Shappee, B. J., Holoien, T. W. -s., Drout, M. R., Auchettl, K., Stritzinger, M. D., Kochanek, C. S., Stanek, K. Z., Shaya, E., Narayan, G., Brown, J. S., Bose, S., Bersier, D., Brimacombe, J., Chen, Ping, Dong, Subo, Holmbo, S., Katz, B., Munnoz, J. A., Mutel, R. L., Post, R. S., Prieto, J. L., Shields, J., Tallon, D., Thompson, T. A., Vallely, P. J., Villanueva Jr., S., Denneau, L., Flewelling, H., Heinze, A. N., Smith, K. W., Stalder, B., Tonry, J. L., Weiland, H., Barclay, T., Barentsen, G., Cody, A. M., Dotson, J., Foerster, F., Garnavich, P., Gully-santiago, M., Hedges, C., Howell, S., Kasen, D., Margheim, S., Mushotzky, R., Rest, A., Tucker, B. E., Villar, A., Zenteno, A., Beerman, G., Bjella, R., Castillo, G., Coughlin, J., Elsaesser, B., Flynn, S., Gangopadhyay, R., Griest, K., Hanley, M., Kampmeier, J., Kloetzel, R., Kohnert, L., Labonde, C., Larsen, R., Larson, K. A., Mccalmont-everton, K. M., Mcginn, C., Migliorini, L., Moffatt, J., Muszynski, M., Nystrom, V., Osborne, D., Packard, M., Peterson, C. A., Redick, M., Reedy, L. H., Ross, S. E., Spencer, B., Steward, K., Van Cleve, J. E., Cardoso, J. Vinicius De Miranda, Weschler, T., Wheaton, A., Bulger, J., Lowe, T. B., Magnier, E. A., Schultz, A. S. B., Waters, C. Z., Willman, M., Baron, Eddie, Chen, Zhihao, Derkacy, James M., Huang, Fang, Li, Linyi, Li, Wenxiong, Li, Xue, Rui, Liming, Sai, Hanna, Wang, Lifan, Wang, Lingzhi, Wang, Xiaofeng, Xiang, Danfeng, Zhang, Jicheng, Zhang, Jujia, Zhang, Kaicheng, Zhang, Tianmeng, Zhang, Xinghan, Zhao, Xulin, Brown, P. J., Hermes, J. J., Nordin, J., Points, S., and Strampelli, G. M.

Abstract

On 2018 Feb. 4.41, the All-Sky Automated Survey for SuperNovae (ASAS-SN) discovered ASASSN-18bt in the K2 Campaign 16 field. With a redshift of z=0.01098 and a peak apparent magnitude of B_{max}=14.31, ASASSN-18bt is the nearest and brightest SNe Ia yet observed by the Kepler spacecraft. Here we present the discovery of ASASSN-18bt, the K2 light curve, and pre-discovery data from ASAS-SN and the Asteroid Terrestrial-impact Last Alert System (ATLAS). The K2 early-time light curve has an unprecedented 30-minute cadence and photometric precision for an SN~Ia light curve, and it unambiguously shows a ~4 day nearly linear phase followed by a steeper rise. Thus, ASASSN-18bt joins a growing list of SNe Ia whose early light curves are not well described by a single power law. We show that a double-power-law model fits the data reasonably well, hinting that two physical processes must be responsible for the observed rise. However, we find that current models of the interaction with a non-degenerate companion predict an abrupt rise and cannot adequately explain the initial, slower linear phase. Instead, we find that existing, published models with shallow 56Ni are able to span the observed behavior and, with tuning, may be able to reproduce the ASASSN-18bt light curve. Regardless, more theoretical work is needed to satisfactorily model this and other early-time SNe~Ia light curves. Finally, we use Swift X-ray non-detections to constrain the presence of circumstellar material (CSM) at much larger distances and lower densities than possible with the optical light curve. For a constant density CSM these non-detections constrain rho<4.5 * 10^5 cm^-3 at a radius of 4 *10^15 cm from the progenitor star. Assuming a wind-like environment, we place mass-loss limits of Mdot< 8 * 10^-6 M_sun yr^-1 for v_w=100 km s^-1, ruling out some symbiotic progenitor systems., Comment: 17 pages, 8 figures, 3 Tables. Accepted to ApJ. This work is part of a number of papers analyzing ASASSN-18bt, with coordinated papers from Dimitriadis et al. (2018) and Li et al. (2018)

Published
2018
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193. Photometric calibration for the Beijing-Arizona Sky Survey and Mayall z-band Legacy Survey

Author

Zhou, Zhimin, Zhou, Xu, Zou, Hu, Zhang, Tianmeng, Nie, Jundan, Peng, Xiyan, Fan, Xiaohui, Jiang, Linhua, McGreer, Ian, Yang, Jinyi, Dey, Arjun, Ma, Jun, Wang, Jiali, Kong, Xu, Yuan, Qirong, Wu, Hong, Schlegel, David, Zhou, Zhimin, Zhou, Xu, Zou, Hu, Zhang, Tianmeng, Nie, Jundan, Peng, Xiyan, Fan, Xiaohui, Jiang, Linhua, McGreer, Ian, Yang, Jinyi, Dey, Arjun, Ma, Jun, Wang, Jiali, Kong, Xu, Yuan, Qirong, Wu, Hong, and Schlegel, David

Abstract

We present the photometric calibration of the Beijing-Arizona Sky Survey (BASS) and Mayall z-band Legacy Survey (MzLS), which are two of the three wide-field optical legacy imaging surveys to provide the baseline targeting data for the Dark Energy Spectroscopic Instrument (DESI) project. The method of our photometric calibration is subdivided into the external and internal processes. The former utilizes the point-source objects of Pan-STARRS1 survey (PS1) as the reference standards to achieve the zero points of the absolute flux for individual exposures. And then the latter revise the zero points to make them consistent across the survey based on multiple tilings and large offset overlaps. Our process achieves a homogeneous photometric calibration over most of the sky with precision better than 10 mmag for g and r bands, 15 mmag for z band. The accuracy of the calibration is better than 1% at the bright end (16-18 mag) over most of the survey area., Comment: 12 pages, 12 figures, Accepted for publication in PASP

Published
2018
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194. Overview of the DESI Legacy Imaging Surveys

Author

Dey, Arjun, Schlegel, David J., Lang, Dustin, Blum, Robert, Burleigh, Kaylan, Fan, Xiaohui, Findlay, Joseph R., Finkbeiner, Doug, Herrera, David, Juneau, Stephanie, Landriau, Martin, Levi, Michael, McGreer, Ian, Meisner, Aaron, Myers, Adam D., Moustakas, John, Nugent, Peter, Patej, Anna, Schlafly, Edward F., Walker, Alistair R., Valdes, Francisco, Weaver, Benjamin A., Zou, Christophe Yeche Hu, Zhou, Xu, Abareshi, Behzad, Abbott, T. M. C., Abolfathi, Bela, Aguilera, C., Alam, Shadab, Allen, Lori, Alvarez, A., Annis, James, Ansarinejad, Behzad, Aubert, Marie, Beechert, Jacqueline, Bell, Eric F., BenZvi, Segev Y., Beutler, Florian, Bielby, Richard M., Bolton, Adam S., Buckley-Geer, Cesar Briceno Elizabeth J., Butler, Karen, Calamida, Annalisa, Carlberg, Raymond G., Carter, Paul, Casas, Ricard, Castander, Francisco J., Choi, Yumi, Comparat, Johan, Cukanovaite, Elena, Delubac, Timothee, DeVries, Kaitlin, Dey, Sharmila, Dhungana, Govinda, Dickinson, Mark, Ding, Zhejie, Donaldson, John B., Duan, Yutong, Duckworth, Christopher J., Eftekharzadeh, Sarah, Eisenstein, Daniel J., Etourneau, Thomas, Fagrelius, Parker A., Farihi, Jay, Fitzpatrick, Mike, Font-Ribera, Andreu, Fulmer, Leah, Gansicke, Boris T., Gaztanaga, Enrique, George, Koshy, Gerdes, David W., Gontcho, Satya Gontcho A, Gorgoni, Claudio, Green, Gregory, Guy, Julien, Harmer, Diane, Hernandez, M., Honscheid, Klaus, Lijuan, Huang, James, David, Jannuzi, Buell T., Jiang, Linhua, Joyce, Richard, Karcher, Armin, Karkar, Sonia, Kehoe, Robert, Kneib, Jean-Paul, Kueter-Young, Andrea, Lan, Ting-Wen, Lauer, Tod, Guillou, Laurent Le, Van Suu, Auguste Le, Lee, Jae Hyeon, Lesser, Michael, Levasseur, Laurence Perreault, Li, Ting S., Mann, Justin L., Marshall, Bob, Martinez-Vazquez, C. E., Martini, Paul, Bourboux, Helion du Mas des, McManus, Sean, Meier, Tobias Gabriel, Menard, Brice, Metcalfe, Nigel, Munoz-Gutierrez, Andrea, Najita, Joan, Napier, Kevin, Narayan, Gautham, Newman, Jeffrey A., Nie, Jundan, Nord, Brian, Norman, Dara J., Olsen, Knut A. G., Paat, Anthony, Palanque-Delabrouille, Nathalie, Peng, Xiyan, Poppett, Claire L., Poremba, Megan R., Prakash, Abhishek, Rabinowitz, David, Raichoor, Anand, Rezaie, Mehdi, Robertson, A. N., Roe, Natalie A., Ross, Ashley J., Ross, Nicholas P., Rudnick, Gregory, Safonova, Sasha, Saha, Abhijit, Sanchez, F. Javier, Savary, Elodie, Schweiker, Heidi, Scott, Adam, Seo, Hee-Jong, Shan, Huanyuan, Silva, David R., Slepian, Zachary, Soto, Christian, Sprayberry, David, Staten, Ryan, Stillman, Coley M., Stupak, Robert J., Summers, David L., Tie, Suk Sien, Tirado, H., Vargas-Magana, Mariana, Vivas, A. Katherina, Wechsler, Risa H., Williams, Doug, Yang, Jinyi, Yang, Qian, Yapici, Tolga, Zaritsky, Dennis, Zenteno, A., Zhang, Kai, Zhang, Tianmeng, Zhou, Rongpu, Zhou, Zhimin, Dey, Arjun, Schlegel, David J., Lang, Dustin, Blum, Robert, Burleigh, Kaylan, Fan, Xiaohui, Findlay, Joseph R., Finkbeiner, Doug, Herrera, David, Juneau, Stephanie, Landriau, Martin, Levi, Michael, McGreer, Ian, Meisner, Aaron, Myers, Adam D., Moustakas, John, Nugent, Peter, Patej, Anna, Schlafly, Edward F., Walker, Alistair R., Valdes, Francisco, Weaver, Benjamin A., Zou, Christophe Yeche Hu, Zhou, Xu, Abareshi, Behzad, Abbott, T. M. C., Abolfathi, Bela, Aguilera, C., Alam, Shadab, Allen, Lori, Alvarez, A., Annis, James, Ansarinejad, Behzad, Aubert, Marie, Beechert, Jacqueline, Bell, Eric F., BenZvi, Segev Y., Beutler, Florian, Bielby, Richard M., Bolton, Adam S., Buckley-Geer, Cesar Briceno Elizabeth J., Butler, Karen, Calamida, Annalisa, Carlberg, Raymond G., Carter, Paul, Casas, Ricard, Castander, Francisco J., Choi, Yumi, Comparat, Johan, Cukanovaite, Elena, Delubac, Timothee, DeVries, Kaitlin, Dey, Sharmila, Dhungana, Govinda, Dickinson, Mark, Ding, Zhejie, Donaldson, John B., Duan, Yutong, Duckworth, Christopher J., Eftekharzadeh, Sarah, Eisenstein, Daniel J., Etourneau, Thomas, Fagrelius, Parker A., Farihi, Jay, Fitzpatrick, Mike, Font-Ribera, Andreu, Fulmer, Leah, Gansicke, Boris T., Gaztanaga, Enrique, George, Koshy, Gerdes, David W., Gontcho, Satya Gontcho A, Gorgoni, Claudio, Green, Gregory, Guy, Julien, Harmer, Diane, Hernandez, M., Honscheid, Klaus, Lijuan, Huang, James, David, Jannuzi, Buell T., Jiang, Linhua, Joyce, Richard, Karcher, Armin, Karkar, Sonia, Kehoe, Robert, Kneib, Jean-Paul, Kueter-Young, Andrea, Lan, Ting-Wen, Lauer, Tod, Guillou, Laurent Le, Van Suu, Auguste Le, Lee, Jae Hyeon, Lesser, Michael, Levasseur, Laurence Perreault, Li, Ting S., Mann, Justin L., Marshall, Bob, Martinez-Vazquez, C. E., Martini, Paul, Bourboux, Helion du Mas des, McManus, Sean, Meier, Tobias Gabriel, Menard, Brice, Metcalfe, Nigel, Munoz-Gutierrez, Andrea, Najita, Joan, Napier, Kevin, Narayan, Gautham, Newman, Jeffrey A., Nie, Jundan, Nord, Brian, Norman, Dara J., Olsen, Knut A. G., Paat, Anthony, Palanque-Delabrouille, Nathalie, Peng, Xiyan, Poppett, Claire L., Poremba, Megan R., Prakash, Abhishek, Rabinowitz, David, Raichoor, Anand, Rezaie, Mehdi, Robertson, A. N., Roe, Natalie A., Ross, Ashley J., Ross, Nicholas P., Rudnick, Gregory, Safonova, Sasha, Saha, Abhijit, Sanchez, F. Javier, Savary, Elodie, Schweiker, Heidi, Scott, Adam, Seo, Hee-Jong, Shan, Huanyuan, Silva, David R., Slepian, Zachary, Soto, Christian, Sprayberry, David, Staten, Ryan, Stillman, Coley M., Stupak, Robert J., Summers, David L., Tie, Suk Sien, Tirado, H., Vargas-Magana, Mariana, Vivas, A. Katherina, Wechsler, Risa H., Williams, Doug, Yang, Jinyi, Yang, Qian, Yapici, Tolga, Zaritsky, Dennis, Zenteno, A., Zhang, Kai, Zhang, Tianmeng, Zhou, Rongpu, and Zhou, Zhimin

Abstract

The DESI Legacy Imaging Surveys are a combination of three public projects (the Dark Energy Camera Legacy Survey, the Beijing-Arizona Sky Survey, and the Mayall z-band Legacy Survey) that will jointly image approximately 14,000 deg^2 of the extragalactic sky visible from the northern hemisphere in three optical bands (g, r, and z) using telescopes at the Kitt Peak National Observatory and the Cerro Tololo Inter-American Observatory. The combined survey footprint is split into two contiguous areas by the Galactic plane. The optical imaging is conducted using a unique strategy of dynamically adjusting the exposure times and pointing selection during observing that results in a survey of nearly uniform depth. In addition to calibrated images, the project is delivering a catalog, constructed by using a probabilistic inference-based approach to estimate source shapes and brightnesses. The catalog includes photometry from the grz optical bands and from four mid-infrared bands (at 3.4, 4.6, 12 and 22 micorons) observed by the Wide-field Infrared Survey Explorer (WISE) satellite during its full operational lifetime. The project plans two public data releases each year. All the software used to generate the catalogs is also released with the data. This paper provides an overview of the Legacy Surveys project., Comment: 47 pages, 18 figures; accepted for publication in the Astronomical Journal

Published
2018
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196. SN 2014J in M82: new insights on the spectral diversity of Type Ia supernovae

Author

Zhang, Kaicheng, primary, Wang, Xiaofeng, primary, Zhang, JuJia, primary, Zhang, Tianmeng, primary, Benetti, S, primary, Elias-Rosa, N, primary, Huang, Fang, primary, Lin, Han, primary, Li, Linyi, primary, Li, Wenxiong, primary, Ochner, P, primary, Pastorello, A, primary, Rui, Liming, primary, Tartaglia, L, primary, Tomasella, L, primary, Siviero, A, primary, Munari, U, primary, Terreran, G, primary, Song, Hao, primary, Taubenberger, S, primary, Wheeler, J Craig, primary, Xiang, Danfeng, primary, Zhao, Xulin, primary, Li, Hongbin, primary, Bai, Jinming, primary, Jiang, Xiaojun, primary, Shi, Jianrong, primary, and Wu, Zhenyu, primary

Published
2018
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197. The Second Data Release of the Beijing–Arizona Sky Survey

Author

Zou, Hu, primary, Zhang, Tianmeng, additional, Zhou, Zhimin, additional, Peng, Xiyan, additional, Nie, Jundan, additional, Zhou, Xu, additional, Fan, Xiaohui, additional, Jiang, Linhua, additional, McGreer, Ian, additional, Dey, Arjun, additional, Fan, Dongwei, additional, Findlay, Joseph R., additional, Gao, Jinhua, additional, Gu, Yizhou, additional, Guo, Yucheng, additional, He, Boliang, additional, Jin, Junjie, additional, Kong, Xu, additional, Lang, Dustin, additional, Lei, Fengjie, additional, Lesser, Michael, additional, Li, Feng, additional, Ma, Jun, additional, Meng, Xiaolei, additional, Maxwell, Moe, additional, Myers, Adam D., additional, Rui, Liming, additional, Schlegel, David, additional, Sun, Fengwu, additional, Wu, Hong, additional, Wang, Jiali, additional, and Yuan, Qirong, additional

Published
2018
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198. Optical Observations of the Young Type Ic Supernova SN 2014L in M99

Author

Zhang, Jujia, primary, Wang, Xiaofeng, additional, Vinkó, József, additional, Wheeler, J. Craig, additional, Chang, Liang, additional, Yang, Yi, additional, Wang, Lifan, additional, Zhai, Qian, additional, Rui, Liming, additional, Mo, Jun, additional, Zhang, Tianmeng, additional, Zhang, Yu, additional, Wang, Jianguo, additional, Mao, Jirong, additional, Wang, Chuanjun, additional, Yi, Weimin, additional, Xin, Yuxin, additional, Li, Wenxiong, additional, Lun, Baoli, additional, Lu, Kaixing, additional, Sai, Hanna, additional, Zheng, Xiangming, additional, Zhang, Xiliang, additional, Zhou, Xu, additional, and Bai, Jinming, additional

Published
2018
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199. Optical observations of the 2002cx-like supernova 2014ek and characterizations of SNe Iax

Author

Li, Linyi, primary, Wang, Xiaofeng, additional, Zhang, Jujia, additional, Arcavi, Iair, additional, Zhang, Tianmeng, additional, Rui, Liming, additional, Hosseinzadeh, Griffin, additional, Howell, D Andrew, additional, McCully, Curtis, additional, Zhang, Kaicheng, additional, Valenti, Stefano, additional, Mo, Jun, additional, Li, Wenxiong, additional, Huang, Fang, additional, Xiang, Danfeng, additional, Wang, Lifan, additional, and Zhou, Xu, additional

Published
2018
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200. Short-lived Circumstellar Interaction in the Low-luminosity Type IIP SN 2016bkv

Author

Hosseinzadeh, Griffin, primary, Valenti, Stefano, additional, McCully, Curtis, additional, Howell, D. Andrew, additional, Arcavi, Iair, additional, Jerkstrand, Anders, additional, Guevel, David, additional, Tartaglia, Leonardo, additional, Rui, Liming, additional, Mo, Jun, additional, Wang, Xiaofeng, additional, Huang, Fang, additional, Song, Hao, additional, Zhang, Tianmeng, additional, and Itagaki, Koichi, additional

Published
2018
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