Zobrazeno 1 - 10
of 394
pro vyhledávání: '"Type Ia supernovæ"'
Autor:
Vladimir N. Yershov
Publikováno v:
Universe, Vol 10, Iss 8, p 325 (2024)
In developing his cosmological model of 1917, de Sitter theoretically predicted the phenomenon of cosmological redshift (the de Sitter effect), which he did long before the discovery of this phenomenon in observations. The de Sitter effect is gravita
Externí odkaz:
https://doaj.org/article/4ebbdcaec470432eb3d9c7532c49e140
Autor:
J. D. R. Pierel, M. Engesser, D. A. Coulter, C. DeCoursey, M. R. Siebert, A. Rest, E. Egami, W. Chen, O. D. Fox, D. O. Jones, B. A. Joshi, T. J. Moriya, Y. Zenati, A. J. Bunker, P. A. Cargile, M. Curti, D. J. Eisenstein, S. Gezari, S. Gomez, M. Guolo, B. D. Johnson, M. Karmen, R. Maiolino, R. M. Quimby, B. Robertson, M. Shahbandeh, L. G. Strolger, F. Sun, Q. Wang, T. Wevers
Publikováno v:
The Astrophysical Journal Letters, Vol 971, Iss 2, p L32 (2024)
We present the James Webb Space Telescope (JWST) discovery of SN 2023adsy, a transient object located in a host galaxy JADES-GS+53.13485−27.82088 with a host spectroscopic redshift of 2.903 ± 0.007. The transient was identified in deep (JWST)/NIRC
Externí odkaz:
https://doaj.org/article/8ca2b65a0aea4db4b417e86a75a2d60d
Autor:
Adam J. Burgasser, Roman Gerasimov, Kyle Kremer, Hunter Brooks, Efrain Alvarado III, Adam C. Schneider, Aaron M. Meisner, Christopher A. Theissen, Emma Softich, Preethi Karpoor, Thomas P. Bickle, Martin Kabatnik, Austin Rothermich, Dan Caselden, J. Davy Kirkpatrick, Jacqueline K. Faherty, Sarah L. Casewell, Marc J. Kuchner, The Backyard Worlds: Planet 9 Collaboration
Publikováno v:
The Astrophysical Journal Letters, Vol 971, Iss 1, p L25 (2024)
We report the discovery of a high-velocity, very low-mass star or brown dwarf whose kinematics suggest it is unbound to the Milky Way. CWISE J124909.08+362116.0 was identified by citizen scientists in the Backyard Worlds: Planet 9 program as a high-p
Externí odkaz:
https://doaj.org/article/4986ac695b8943b2b4bcb6950e377b9b
Publikováno v:
The Astrophysical Journal Letters, Vol 968, Iss 1, p L6 (2024)
No progenitor of a Type Ia supernova (SN Ia) is known, but in old-population early-type galaxies, one may find SNe Ia associated with globular clusters, yielding a population age and metallicity. It also provides insight into the formation path and t
Externí odkaz:
https://doaj.org/article/8a7b8c5a800e4b32972c040f5b74e094
Autor:
J. D. R. Pierel, A. B. Newman, S. Dhawan, M. Gu, B. A. Joshi, T. Li, S. Schuldt, L. G. Strolger, S. H. Suyu, G. B. Caminha, S. H. Cohen, J. M. Diego, J. C. J. DŚilva, S. Ertl, B. L. Frye, G. Granata, C. Grillo, A. M. Koekemoer, J. Li, A. Robotham, J. Summers, T. Treu, R. A. Windhorst, A. Zitrin, S. Agarwal, A. Agrawal, N. Arendse, S. Belli, C. Burns, R. Cañameras, S. Chakrabarti, W. Chen, T. E. Collett, D. A. Coulter, R. S. Ellis, M. Engesser, N. Foo, O. D. Fox, C. Gall, N. Garuda, S. Gezari, S. Gomez, K. Glazebrook, J. Hjorth, X. Huang, S. W. Jha, P. S. Kamieneski, P. Kelly, C. Larison, L. A. Moustakas, M. Pascale, I. Pérez-Fournon, T. Petrushevska, F. Poidevin, A. Rest, M. Shahbandeh, A. J. Shajib, M. Siebert, C. Storfer, M. Talbot, Q. Wang, T. Wevers, Y. Zenati
Publikováno v:
The Astrophysical Journal Letters, Vol 967, Iss 2, p L37 (2024)
A bright ( m _F150W,AB = 24 mag), z = 1.95 supernova (SN) candidate was discovered in JWST/NIRCam imaging acquired on 2023 November 17. The SN is quintuply imaged as a result of strong gravitational lensing by a foreground galaxy cluster, detected in
Externí odkaz:
https://doaj.org/article/2158c50abcc04d72963ef0b011df2e1a
Autor:
Seokcheon Lee
Publikováno v:
Universe, Vol 10, Iss 6, p 268 (2024)
In the context of the minimally extended varying speed of light (meVSL) model, both the absolute magnitude and the luminosity distance of type Ia supernovae (SNe Ia) deviate from those predicted by general relativity (GR). Using data from the Pantheo
Externí odkaz:
https://doaj.org/article/653b7ea7f1954f8d85592cfb1d7f9de4
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 10 (2023)
Seven possible ultra-low-mass and small-radius white dwarfs have been recently identified, with masses ranging from ∼0.02 M⊙ to ∼0.08 M⊙ and radii ranging from ∼ 4,270 km to 10670 km. The mass–radius measurements of these white dwarfs pos
Externí odkaz:
https://doaj.org/article/e9cc27e4a3f445b4af53735026233d7c
Publikováno v:
The Astrophysical Journal, Vol 973, Iss 1, p 65 (2024)
Type Ia supernovae arise from thermonuclear explosions of white dwarfs accreting from a binary companion. Following the explosion, the surviving donor star leaves at roughly its orbital velocity. The discovery of the runaway helium subdwarf star US 7
Externí odkaz:
https://doaj.org/article/4adcbc85f7ab48caa676744dca3762d9
Publikováno v:
The Astrophysical Journal, Vol 972, Iss 2, p 200 (2024)
The precise origin of Type Ia supernovae (SNe Ia) is unknown despite their value to numerous areas in astronomy. While it is a long-standing consensus that they arise from the explosion of a carbon/oxygen white dwarf, the exact progenitor configurati
Externí odkaz:
https://doaj.org/article/9e275afd7aaa44ab80cc6ea1e6e6dfbc
Autor:
Christa Gall, Jens Hjorth, Lise Christensen, Luca Izzo, Paolo A. Mazzali, Mark M. Phillips, Peter Hoeflich, Charlotte Angus, Cecilie Cold, Jonatan Selsing
Publikováno v:
The Astrophysical Journal, Vol 972, Iss 1, p 114 (2024)
The origin of strong sodium absorption, which has been observed for a few nearby Type Ia supernovae (SNe Ia), remains elusive. Here we analyze two high-signal-to-noise, intermediate-resolution Very Large Telescope/X-shooter spectra at epochs +18 and
Externí odkaz:
https://doaj.org/article/4f50380813634bcca472da1c592651e6