Results 41 to 50 of about 823 (184)

New Arabic Records From Cairo on Supernovae 1181 and 1006

Astronomische Nachrichten, Volume 346, Issue 9, November 2025.
ABSTRACT The remnant of the historical supernova SN 1181 is under discussion: While the previously suggested G130.7+3.1 (3C58) appears too old (3000–5000 year), the unusual star IRAS00500+6713 with a surrounding nebula (Pa‐30) has an expansion age not inconsistent with a SN Iax explosion in ad 1181 under the assumption that neither acceleration nor ...
J. G. Fischer, H. Halm, R. Neuhäuser, D. L. Neuhäuser   +3 more
wiley   +1 more source

OPTICAL SPECTROSCOPY OF TYPE Ia SUPERNOVAE [PDF]

The Astronomical Journal, 2008
We present 432 low-dispersion optical spectra of 32 Type Ia supernovae (SNe Ia) that also have well-calibrated light curves. The coverage ranges from 6 epochs to 36 epochs of spectroscopy. Most of the data were obtained with the 1.5m Tillinghast telescope at the F. L.
Matheson, T., Kirshner, Robert, Challis, Peter, Jha, S., Garnavich, P. M., Berlind, Perry, Calkins, Michael, Blondin, S., Balog, Z., Bragg, A. E., Caldwell, Nelson, Concannon, K. Dendy, Falco, E. E., Graves, G. J. M., Huchra, J. P., Kuraszkiewicz, Joanna, Mader, J. A., Mahdavi, A., Phelps, Matthew, Rines, K., Song, I., Wilkes, Belinda   +21 more
openaire   +3 more sources

Flight of the Bumblebee: the Early Excess Flux of Type Ia Supernova 2023bee Revealed by TESS, Swift, and Young Supernova Experiment Observations

The Astrophysical Journal
We present high-cadence ultraviolet through near-infrared observations of the Type Ia supernova (SN Ia) 2023bee at D = 32 ± 3 Mpc, finding excess flux in the first days after explosion, particularly in our 10 minutes cadence TESS light curve and Swift UV
Qinan Wang, Armin Rest, Georgios Dimitriadis, Ryan Ridden-Harper, Matthew R. Siebert, Mark Magee, Charlotte R. Angus, Katie Auchettl, Kyle W. Davis, Ryan J. Foley, Ori D. Fox, Sebastian Gomez, Jacob E. Jencson, David O. Jones, Charles D. Kilpatrick, Justin D. R. Pierel, Anthony L. Piro, Abigail Polin, Collin A. Politsch, César Rojas-Bravo, Melissa Shahbandeh, V. Ashley Villar, Yossef Zenati, C. Ashall, Kenneth C. Chambers, David A. Coulter, Thomas de Boer, Nico DiLullo, Christa Gall, Hua Gao, Eric Y. Hsiao, Mark E. Huber, Luca Izzo, Nandita Khetan, Natalie LeBaron, Eugene A. Magnier, Kaisey S. Mandel, Peter McGill, Hao-Yu Miao, Yen-Chen Pan, Catherine P. Stevens, Jonathan J. Swift, Kirsty Taggart, Grace Yang   +43 more
doaj   +1 more source

NtCML19 Is Recruited by Tobacco to Interact With the Deacetylase Protein RsDN3377 of Rhizoctonia solani AG3‐TB, Inhibiting Fungal Infection

Molecular Plant Pathology, Volume 26, Issue 11, November 2025.
The deacetylase RsDN3377 is recognised by the calcium‐binding protein NtCML19, which enhances host resistance against Rhizoctonia solani infection by inducing cell death and reactive oxygen species (ROS) accumulation. ABSTRACT The necrotrophic fungal pathogen Rhizoctonia solani anastomosis group 3 (AG3‐TB) is a major cause of global tobacco crop yield ...
Xinchun Li, Yan Li, He Liu, Mengnan An, Zihao Xia, Chong Zhang, Wenfu Chen, Yuanhua Wu   +7 more
wiley   +1 more source

SHOCK BREAKOUT FROM TYPE Ia SUPERNOVA [PDF]

The Astrophysical Journal, 2009
The mode of explosive burning in Type Ia SNe remains an outstanding problem. It is generally thought to begin as a subsonic deflagration, but this may transition into a supersonic detonation (the DDT). We argue that this transition leads to a breakout shock, which would provide the first unambiguous evidence that DDTs occur.
Piro, Anthony L., Chang, Philip, Weinberg, Nevin N.   +2 more
openaire   +2 more sources

Early Lightcurves of Type Ia Supernovae Are Consistent with Nondegenerate Progenitor Companions

The Astrophysical Journal
If Type Ia supernovae (SNe Ia) result from a white dwarf being ignited by Roche-lobe overflow from a nondegenerate companion, then as the SN explosion runs into the companion star its ejecta will be shocked, causing an early blue excess in the lightcurve.
J. Burke, M. Andrews, D. A. Howell, D. J. Sand, R. C. Amaro, P. J. Brown, J. E. Andrews, K. A. Bostroem, Y. Dong, J. Haislip, D. Hiramatsu, G. Hosseinzadeh, V. Kouprianov, M. J. Lundquist, C. McCully, C. Pellegrino, D. Reichart, L. Tartaglia, S. Valenti, S. Wyatt, S. Yang   +20 more
doaj   +1 more source

Comparing the Locations of Supernovae to CO (2–1) Emission in Their Host Galaxies

The Astrophysical Journal, 2023
We measure the molecular gas environment near recent (
Ness Mayker Chen, Adam K. Leroy, Laura A. Lopez, Samantha Benincasa, Mélanie Chevance, Simon C. O. Glover, Annie Hughes, Kathryn Kreckel, Sumit Sarbadhicary, Jiayi Sun, Todd A. Thompson, Dyas Utomo, Frank Bigiel, Guillermo A. Blanc, Daniel A. Dale, Kathryn Grasha, J. M. Diederik Kruijssen, Hsi-An Pan, Miguel Querejeta, Eva Schinnerer, Elizabeth J. Watkins, Thomas G. Williams   +21 more
doaj   +1 more source

Models of Type Ia Supernova Explosions [PDF]

, 2003
Type Ia supernovae have become an indispensable tool for studying the expansion history of the universe, yet our understanding of the explosion mechanism is still incomplete. We describe the variety of discussed scenarios, sketch the most relevant physics, and report recent advances in multidimensional simulations of Chandrasekhar mass white dwarf ...
Niemeyer, Jens Carsten, Reinecke, Martin, Hillebrandt, Wolfgang, Wagner, S., Bode, A., Hanke, W., Durst, F.   +6 more
openaire   +4 more sources

A Linear Relation between the Color Stretch s BV and the Rising Color Slope of Type Ia Supernovae

The Astrophysical Journal, 2023
Using data from the Complete Nearby (redshift z _host < 0.02) sample of Type Ia Supernovae (CNIa0.02), we find a linear relation between two parameters derived from the B − V color curves of Type Ia supernovae: the color stretch s _BV and the rising ...
Ping Chen, Subo Dong, Chris Ashall, S. Benetti, D. Bersier, S. Bose, Joseph Brimacombe, Thomas G. Brink, David A. H. Buckley, Enrico Cappellaro, Grant W. Christie, N. Elias-Rosa, Alexei V. Filippenko, Mariusz Gromadzki, Thomas W.-S. Holoien, Shaoming Hu, C. S. Kochanek, Robert Koff, Juna A. Kollmeier, P. Lundqvist, S. Mattila, Peter A. Milne, J. A. Muñoz, Robert Mutel, Tim Natusch, Joel Nicolas, A. Pastorello, Simon Prentice, J. L. Prieto, Tyler Roth, B. J. Shappee, Geoffrey Stone, K. Z. Stanek, M. D. Stritzinger, Todd A. Thompson, Lina Tomasella, Steven Villanueva   +36 more
doaj   +1 more source

Phosphazene Base Mediated (sp3)CH Functionalization with CO2 and CS2

European Journal of Inorganic Chemistry, Volume 28, Issue 24, August 29, 2025.
Selective deprotonation of HCF3, HC2F5, and CH3CN by the phosphazene base EtP4 in the presence of CO2 or CS2 affords the phosphazenium carboxylates [EtP4H]+[F3CCO2]− and [EtP4H]+[F5C2CO2]−, as well as the corresponding dithiocarboxylates [EtP4H]+[F3CCS2]− and [EtP4H]+[F5C2CS2]−.
Katharina Wels, Beate Neumann, Jan‐Hendrik Lamm, Hans‐Georg Stammler, Berthold Hoge   +4 more
wiley   +1 more source