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18,065 results on '"Williams, Robert"'

1. Common Envelopes, Gamma Rays, and Sudden Spectral Changes of Novae

Author

Williams, Robert, Ryan, Russell, and Rudy, Richard

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract

A common envelope (CE) is proposed as the origin of the early postoutburst spectra of many novae. A simple model is proposed to explain the properties of the CE based on the emission line strengths and an assumed density distribution. Rapid changes in the spectrum during postoutburst decline are suggested as possible evidence for a CE. Time-resolved spectra from the ARAS group show sudden spectral shifts that are correlated with detected gamma ray emission, suggestive of its possible origin on the WD that produces a change in condition within the CE. Episodic mass loss, formation of thea transient heavy element absorption systems, and dissipation of the CE may be triggered by gamma ray emission., Comment: 20 pages, 6 figures, Accepted for publication in The Astrophysical Journal

Published
2024

3. Contributors

Author

Sinitiere, Phillip Luke, Murrell, Gary, Lewis, David Levering, Horne, Gerald, Williams, Robert W., and Aptheker, Bettina

Published
2019

4. Afterword

Author

Sinitiere, Phillip Luke, Murrell, Gary, Lewis, David Levering, Horne, Gerald, Williams, Robert W., and Aptheker, Bettina

Published
2019

5. Title Page, Copyright Page

Author

Sinitiere, Phillip Luke, Murrell, Gary, Lewis, David Levering, Horne, Gerald, Williams, Robert W., and Aptheker, Bettina

Published
2019

8. Index

Author

Sinitiere, Phillip Luke, Murrell, Gary, Lewis, David Levering, Horne, Gerald, Williams, Robert W., and Aptheker, Bettina

Published
2019

10. The Politics of Memory and Meaning

Author

Sinitiere, Phillip Luke, Murrell, Gary, Lewis, David Levering, Horne, Gerald, Williams, Robert W., and Aptheker, Bettina

Published
2019

14. Gender and the Politics of Freedom

Author

Sinitiere, Phillip Luke, Murrell, Gary, Lewis, David Levering, Horne, Gerald, Williams, Robert W., and Aptheker, Bettina

Published
2019

26. A revamped rat reference genome improves the discovery of genetic diversity in laboratory rats

Author

de Jong, Tristan V, Pan, Yanchao, Rastas, Pasi, Munro, Daniel, Tutaj, Monika, Akil, Huda, Benner, Chris, Chen, Denghui, Chitre, Apurva S, Chow, William, Colonna, Vincenza, Dalgard, Clifton L, Demos, Wendy M, Doris, Peter A, Garrison, Erik, Geurts, Aron M, Gunturkun, Hakan M, Guryev, Victor, Hourlier, Thibaut, Howe, Kerstin, Huang, Jun, Kalbfleisch, Ted, Kim, Panjun, Li, Ling, Mahaffey, Spencer, Martin, Fergal J, Mohammadi, Pejman, Ozel, Ayse Bilge, Polesskaya, Oksana, Pravenec, Michal, Prins, Pjotr, Sebat, Jonathan, Smith, Jennifer R, Woods, Leah C Solberg, Tabakoff, Boris, Tracey, Alan, Uliano-Silva, Marcela, Villani, Flavia, Wang, Hongyang, Sharp, Burt M, Telese, Francesca, Jiang, Zhihua, Saba, Laura, Wang, Xusheng, Murphy, Terence D, Palmer, Abraham A, Kwitek, Anne E, Dwinell, Melinda R, Williams, Robert W, Li, Jun Z, and Chen, Hao

Subjects
Biological Sciences, Bioinformatics and Computational Biology, Genetics, Human Genome, Biotechnology, Good Health and Well Being, Rats, Animals, Genome, Molecular Sequence Annotation, Genomics, Whole Genome Sequencing, Genetic Variation, Rnor_6.0, genetic map, heterogeneous stock, hybrid rat diversity panel, inbred strains, mRatBN7.2, phylogenetic tree, rat, recombinant inbred, reference genome
Abstract

The seventh iteration of the reference genome assembly for Rattus norvegicus-mRatBN7.2-corrects numerous misplaced segments and reduces base-level errors by approximately 9-fold and increases contiguity by 290-fold compared with its predecessor. Gene annotations are now more complete, improving the mapping precision of genomic, transcriptomic, and proteomics datasets. We jointly analyzed 163 short-read whole-genome sequencing datasets representing 120 laboratory rat strains and substrains using mRatBN7.2. We defined ∼20.0 million sequence variations, of which 18,700 are predicted to potentially impact the function of 6,677 genes. We also generated a new rat genetic map from 1,893 heterogeneous stock rats and annotated transcription start sites and alternative polyadenylation sites. The mRatBN7.2 assembly, along with the extensive analysis of genomic variations among rat strains, enhances our understanding of the rat genome, providing researchers with an expanded resource for studies involving rats.

Published
2024

27. Bibliography

Author

Williams, Robert G.

Published
2014

28. Index

Author

Williams, Robert G.

Published
2014

31. Notes

Author

Williams, Robert G.

Published
2014

44. Contents

Author

Williams, Robert G.

Published
2014

50. Serendipitous detection of the dusty Type IIL SN 1980K with JWST/MIRI

Author

Zsíros, Szanna, Szalai, Tamás, De Looze, Ilse, Sarangi, Arkaprabha, Shahbandeh, Melissa, Fox, Ori D., Temim, Tea, Milisavljevic, Dan, Van Dyk, Schuyler D., Smith, Nathan, Filippenko, Alexei V., Brink, Thomas G., Zheng, WeiKang, Dessart, Luc, Jencson, Jacob, Johansson, Joel, Pierel, Justin, Rest, Armin, Tinyanont, Samaporn, Niculescu-Duvaz, Maria, Barlow, M. J., Wesson, Roger, Andrews, Jennifer, Clayton, Geoff, De, Kishalay, Dwek, Eli, Engesser, Michael, Foley, Ryan J., Gezari, Suvi, Gomez, Sebastian, Gonzaga, Shireen, Kasliwal, Mansi, Lau, Ryan, Marston, Anthony, O'Steen, Richard, Siebert, Matthew, Skrutskie, Michael, Strolger, Lou, Wang, Qinan, Williams, Brian, Williams, Robert, and Xiao, Lin

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Astrophysics of Galaxies, Astrophysics - Solar and Stellar Astrophysics
Abstract

We present mid-infrared (mid-IR) imaging of the Type IIL supernova (SN) 1980K with the James Webb Space Telescope (JWST) more than 40 yr post-explosion. SN 1980K, located in the nearby ($D\approx7$ Mpc) "SN factory" galaxy NGC 6946, was serendipitously captured in JWST/MIRI images taken of the field of SN 2004et in the same galaxy. SN 1980K serves as a promising candidate for studying the transitional phase between young SNe and older SN remnants and also provides a great opportunity to investigate its the close environment. SN 1980K can be identified as a clear and bright point source in all eight MIRI filters from F560W up to F2550W. We fit analytical dust models to the mid-IR spectral energy distribution that reveal a large amount ($M_d \approx 0.002 {M}_{\odot}$) of Si-dominated dust at $T_{dust}\approx 150$ K (accompanied by a hotter dust/gas component), and also computed numerical SED dust models. Radiative transfer modeling of a late-time optical spectrum obtained recently with Keck discloses that an even larger ($\sim 0.24-0.58~{M}_{\odot}$) amount of dust is needed in order for selective extinction to explain the asymmetric line profile shapes observed in SN 1980K. As a conclusion, with JWST, we may see i) pre-existing circumstellar dust heated collisionally (or, partly radiatively), analogous to the equatorial ring of SN 1987A, or ii) the mid-IR component of the presumed newly-formed dust, accompanied by much more colder dust present in the ejecta (as suggested by the late-time the optical spectra)., Comment: 14 pages, 9 figures

Published
2023

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