Results 81 to 90 of about 48,593 (219)

A Possible Solution to the Mystery of the ANITA Anomalous Events

Annalen der Physik, Volume 538, Issue 4, April 2026.
In 2006 and 2014, the Antarctic Impulsive Transient Antenna (ANITA), a balloon‐borne radio observatory flying over Antarctica, detected two strange upward‐going radio pulse events that have not yet been explained by our current understanding of physics.
Massimo Villata
wiley   +1 more source

Precursors of Supernovae from Mass Eruption: Prospects for Early Warning of Nearby Core-collapse Supernovae

The Astrophysical Journal, 2023
Recent observations of a large fraction of Type II supernovae (SNe) show traces of dense circumstellar medium (CSM) very close to the progenitor star. If this CSM is created by eruptive mass loss several months before core collapse, the eruption itself ...
Daichi Tsuna, Yuki Takei, Toshikazu Shigeyama   +2 more
doaj   +1 more source

Establishing Indium in Frustrated Lewis Pair Chemistry: From Synthesis to Catalytic Applications

ChemistryEurope, Volume 4, Issue 4, April 2026.
Not that hard: The effects of chemical hardness of the soft FLP tBu2InCH2PtBu2 and its pyridine‐adduct tBu2In(py)CH2PtBu2 were examined in adduct formation reactions toward H2, CO2, and CS2. The frustrated Lewis pair shows catalytic activity in the reduction of CO2 with pinacolborane.
Daniel N. Heuer, Jan‐Hendrik Lamm, Hans‐Georg Stammler, Beate Neumann, Andreas Mix, Yury V. Vishnevskiy, Norbert W. Mitzel   +6 more
wiley   +1 more source

Light echoes - Type II supernovae

The Astrophysical Journal, 1987
Type II supernovae (SNs) light curves show a remarkable range of shapes. Data have been collected for the 12 Type II SNs that have light curve information for more than four months past maximum. Contrary to previous reports, it is found that (1) the decay rate after 100 days past maximum varies by almost an order of magnitude and (2) the light curve ...
openaire   +1 more source

Probing the Shock Breakout Signal of SN 2024ggi from the Transformation of Early Flash Spectroscopy

The Astrophysical Journal Letters
We present early-time, hour-to-day cadence spectroscopy of the nearby Type II supernova (SN II) 2024ggi, which was discovered at a phase when the SN shock had just emerged from the red supergiant (RSG) progenitor star.
Jujia Zhang, Luc Dessart, Xiaofeng Wang, Qian Zhai, Yi Yang, Liping Li, Han Lin, Giorgio Valerin, Yongzhi Cai, Zhen Guo, Lingzhi Wang, Zeyi Zhao, Zhenyu Wang, Shengyu Yan   +13 more
doaj   +1 more source

Ejection of Supernova-Enriched Gas From Dwarf Disk Galaxies

, 2004
We examine the efficiency with which supernova-enriched gas may be ejected from dwarf disk galaxies, using a methodology previously employed to study the self-enrichment efficiency of dwarf spheroidal systems.
Cole S., Douglas N. C. Lin, Kauffmann G., P. Chris Fragile, Persic M., Quinn T., Stephen D. Murray, White S. D. M.   +7 more
core   +1 more source

Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the String‐Theoretical Swampland Programme

Fortschritte der Physik, Volume 74, Issue 4, April 2026.
Abstract String theory has strong implications for cosmology, implying the absence of a cosmological constant, ruling out single‐field slow‐roll inflation, and that black holes decay. The origins of these statements are elucidated within the string‐theoretical swampland programme.
Kay Lehnert
wiley   +1 more source

Discovery and Extensive Follow-up of SN 2024ggi, a Nearby Type IIP Supernova in NGC 3621

The Astrophysical Journal
We present the discovery and early observations of the nearby Type II supernova (SN) 2024ggi in NGC 3621 at 6.64 ± 0.3 Mpc. The SN was caught $5.{8}_{-2.9}^{+1.9}$ hr after its explosion by the ATLAS survey.
Ting-Wan Chen, Sheng Yang, Shubham Srivastav, Takashi J. Moriya, Stephen J. Smartt, Sofia Rest, Armin Rest, Hsing Wen Lin, Hao-Yu Miao, Yu-Chi Cheng, Amar Aryan, Chia-Yu Cheng, Morgan Fraser, Li-Ching Huang, Meng-Han Lee, Cheng-Han Lai, Yu-Hsuan Liu, Aiswarya Sankar.K, Ken W. Smith, Heloise F. Stevance, Ze-Ning Wang, Joseph P. Anderson, Charlotte R. Angus, Thomas de Boer, Kenneth Chambers, Hao-Yuan Duan, Nicolas Erasmus, Michael Fulton, Hua Gao, Joanna Herman, Wei-Jie Hou, Hsiang-Yao Hsiao, Mark E. Huber, Chien-Cheng Lin, Hung-Chin Lin, Eugene A. Magnier, Ka Kit Man, Thomas Moore, Chow-Choong Ngeow, Matt Nicholl, Po-Sheng Ou, Giuliano Pignata, Yu-Chien Shiau, Julian Silvester Sommer, John L. Tonry, Xiao-Feng Wang, Richard Wainscoat, David R. Young, You-Ting Yeh, Jujia Zhang   +49 more
doaj   +1 more source

Neutrinos from Choked Jets Accompanied by Type-II Supernovae

, 2018
The origin of the IceCube neutrinos is still an open question. Upper limits from diffuse gamma-ray observations suggest that the neutrino sources are either distant or hidden from gamma-ray observations.
Fan, Yi-Zhong, He, Hao-Ning, Kusenko, Alexander, Nagataki, Shigehiro, Wei, Da-Ming   +4 more
core   +1 more source

Broad Band Polarimetry of Supernovae: SN1994D, SN1994Y, SN1994ae, SN1995D and SN 1995H [PDF]

, 1996
We have made polarimetric observations of three Type Ia supernovae (SN Ia) and two type II supernovae (SN II). No significant polarization was detected for any of the SN Ia down to the level of 0.2\%, while polarization of order $1.0\%$ was detected for ...
Clocchiatti, Alejandro, Li, Zongwei, Wang, Lifan, Wheeler, J. Craig   +3 more
core   +2 more sources