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Start Over Author "Yao, Yuhan" Journal monthly notices of the royal astronomical society
6 results on '"Yao, Yuhan"'

1. Establishing accretion flares from supermassive black holes as a source of high-energy neutrinos

Author

van Velzen, Sjoert, primary, Stein, Robert, additional, Gilfanov, Marat, additional, Kowalski, Marek, additional, Hayasaki, Kimitake, additional, Reusch, Simeon, additional, Yao, Yuhan, additional, Garrappa, Simone, additional, Franckowiak, Anna, additional, Gezari, Suvi, additional, Nordin, Jakob, additional, Fremling, Christoffer, additional, Sharma, Yashvi, additional, Yan, Lin, additional, Kool, Erik C, additional, Stern, Daniel, additional, Veres, Patrik M, additional, Sollerman, Jesper, additional, Medvedev, Pavel, additional, Sunyaev, Rashid, additional, Bellm, Eric C, additional, Dekany, Richard G, additional, Duev, Dimitri A, additional, Graham, Matthew J, additional, Kasliwal, Mansi M, additional, Kulkarni, Shrinivas R, additional, Laher, Russ R, additional, Riddle, Reed L, additional, and Rusholme, Ben, additional

Published
2024
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2. The interaction of supernova 2018evt with a substantial amount of circumstellar matter – An SN 1997cy-like event

Author

Yang, Yi, primary, Baade, Dietrich, additional, Hoeflich, Peter, additional, Wang, Lifan, additional, Cikota, Aleksandar, additional, Chen, Ting-Wan, additional, Burke, Jamison, additional, Hiramatsu, Daichi, additional, Pellegrino, Craig, additional, Howell, D Andrew, additional, McCully, Curtis, additional, Valenti, Stefano, additional, Schulze, Steve, additional, Gal-Yam, Avishay, additional, Wang, Lingzhi, additional, Filippenko, Alexei V, additional, Maeda, Keiichi, additional, Bulla, Mattia, additional, Yao, Yuhan, additional, Maund, Justyn R, additional, Patat, Ferdinando, additional, Spyromilio, Jason, additional, Wheeler, J Craig, additional, Rau, Arne, additional, Hu, Lei, additional, Li, Wenxiong, additional, Andrews, Jennifer E, additional, Galbany, Llúis, additional, Sand, David J, additional, Shahbandeh, Melissa, additional, Hsiao, Eric Y, additional, and Wang, Xiaofeng, additional

Published
2022
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3. The long-active afterglow of GRB 210204A: detection of the most delayed flares in a gamma-ray burst

Author

Kumar, Harsh, Gupta, Rahul, Saraogi, Divita, Ahumada, Tomás, Andreoni, Igor, Anupama, G. C., Aryan, Amar, Barway, Sudhanshu, Bhalerao, Varun, Chandra, Poonam, Coughlin, Michael W., Dimple, Dutta, Anirban, Ghosh, Ankur, Ho, Anna Y. Q., Kool, E. C., Kumar, Amit, Medford, Michael S., Misra, Kuntal, Pandey, Shashi B., Perley, Daniel A., Riddle, Reed, Ror, Amit Kumar, Setiadi, Jason M., and Yao, Yuhan

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), FOS: Physical sciences, Astrophysics - High Energy Astrophysical Phenomena
Abstract

We present results from extensive broadband follow-up of GRB 210204A over the period of thirty days. We detect optical flares in the afterglow at 7.6 x 10^5 s and 1.1 x 10^6 s after the burst: the most delayed flaring ever detected in a GRB afterglow. At the source redshift of 0.876, the rest-frame delay is 5.8 x 10^5 s (6.71 d). We investigate possible causes for this flaring and conclude that the most likely cause is a refreshed shock in the jet. The prompt emission of the GRB is within the range of typical long bursts: it shows three disjoint emission episodes, which all follow the typical GRB correlations. This suggests that GRB 210204A might not have any special properties that caused late-time flaring, and the lack of such detections for other afterglows might be resulting from the paucity of late-time observations. Systematic late-time follow-up of a larger sample of GRBs can shed more light on such afterglow behaviour. Further analysis of the GRB 210204A shows that the late time bump in the light curve is highly unlikely due to underlying SNe at redshift (z) = 0.876 and is more likely due to the late time flaring activity. The cause of this variability is not clearly quantifiable due to the lack of multi-band data at late time constraints by the bad weather conditions. The flare of GRB 210204A is the latest flare detected to date., 18 pages, 12 figures

Published
2022

4. The interaction of supernova 2018evt with a substantial amount of circumstellar matter – An SN 1997cy-like event.

Author

(杨轶), Yi Yang, Baade, Dietrich, Hoeflich, Peter, Wang, Lifan, Cikota, Aleksandar, Chen, Ting-Wan, Burke, Jamison, Hiramatsu, Daichi, Pellegrino, Craig, Howell, D Andrew, McCully, Curtis, Valenti, Stefano, Schulze, Steve, Gal-Yam, Avishay, Wang, Lingzhi, Filippenko, Alexei V, Maeda, Keiichi, Bulla, Mattia, Yao, Yuhan, and Maund, Justyn R

Subjects
VERY large telescopes, CIRCUMSTELLAR matter, SUPERNOVAE, COMMONS
Abstract

A rare class of supernovae (SNe) is characterized by strong interaction between the ejecta and several solar masses of circumstellar matter (CSM) as evidenced by strong Balmer-line emission. Within the first few weeks after the explosion, they may display spectral features similar to overluminous Type Ia SNe, while at later phase their observation properties exhibit remarkable similarities with some extreme case of Type IIn SNe that show strong Balmer lines years after the explosion. We present polarimetric observations of SN 2018evt obtained by the ESO Very Large Telescope from 172 to 219 d after the estimated time of peak luminosity to study the geometry of the CSM. The non-zero continuum polarization decreases over time, suggesting that the mass-loss of the progenitor star is aspherical. The prominent H α emission can be decomposed into a broad, time-evolving component and an intermediate-width, static component. The former shows polarized signals, and it is likely to arise from a cold dense shell (CDS) within the region between the forward and reverse shocks. The latter is significantly unpolarized, and it is likely to arise from shocked, fragmented gas clouds in the H-rich CSM. We infer that SN 2018evt exploded inside a massive and aspherical circumstellar cloud. The symmetry axes of the CSM and the SN appear to be similar. SN 2018evt shows observational properties common to events that display strong interaction between the ejecta and CSM, implying that they share similar circumstellar configurations. Our preliminary estimate also suggests that the circumstellar environment of SN 2018evt has been significantly enriched at a rate of ∼0.1 M⊙ yr−1 over a period of >100 yr. [ABSTRACT FROM AUTHOR]

Published
2023
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5. Real-time discovery of AT2020xnd: a fast, luminous ultraviolet transient with minimal radioactive ejecta

Author

Perley, Daniel A, primary, Ho, Anna Y Q, additional, Yao, Yuhan, additional, Fremling, Christoffer, additional, Anderson, Joseph P, additional, Schulze, Steve, additional, Kumar, Harsh, additional, Anupama, G C, additional, Barway, Sudhanshu, additional, Bellm, Eric C, additional, Bhalerao, Varun, additional, Chen, Ting-Wan, additional, Duev, Dmitry A, additional, Galbany, Lluís, additional, Graham, Matthew J, additional, Gromadzki, Mariusz, additional, Gutiérrez, Claudia P, additional, Ihanec, Nada, additional, Inserra, Cosimo, additional, Kasliwal, Mansi M, additional, Kool, Erik C, additional, Kulkarni, S R, additional, Laher, Russ R, additional, Masci, Frank J, additional, Neill, James D, additional, Nicholl, Matt, additional, Pursiainen, Miika, additional, van Roestel, Joannes, additional, Sharma, Yashvi, additional, Sollerman, Jesper, additional, Walters, Richard, additional, and Wiseman, Philip, additional

Published
2021
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6. The ZTF Source Classification Project – II. Periodicity and variability processing metrics

Author

Coughlin, Michael W, primary, Burdge, Kevin, additional, Duev, Dmitry A, additional, Katz, Michael L, additional, van Roestel, Jan, additional, Drake, Andrew, additional, Graham, Matthew J, additional, Hillenbrand, Lynne, additional, Mahabal, Ashish A, additional, Masci, Frank J, additional, Mróz, Przemek, additional, Prince, Thomas A, additional, Yao, Yuhan, additional, Bellm, Eric C, additional, Burruss, Rick, additional, Dekany, Richard, additional, Jaodand, Amruta, additional, Kaplan, David L, additional, Kupfer, Thomas, additional, Laher, Russ R, additional, Riddle, Reed, additional, Rigault, Mickael, additional, Rodriguez, Hector, additional, Rusholme, Ben, additional, and Zolkower, Jeffry, additional

Published
2021
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