Results 31 to 40 of about 823 (184)

SN 2021hpr: A Normal Type Ia Supernova Showing Excess Emission in the Early Rising Phase

The Astrophysical Journal
We present extensive optical observations of a nearby Type Ia supernova (SN Ia), SN 2021hpr, located in the spiral galaxy NGC 3147 at a distance of ∼45 Mpc. Our observations cover a phase within ∼1–2 days to ∼290 days after the explosion.
Abdusamatjan Iskandar, Xiaofeng Wang, Ali Esamdin, Xiangyun Zeng, Craig Pellegrino, Shengyu Yan, Jialian Liu, Alexei V. Filippenko, D. Andrew Howell, Curtis McCully, Thomas G. Brink, Maokai Hu, Yi Yang, WeiKang Zheng, Guoliang Lü, Jujia Zhang, CuiYing Song, RuiFeng Huang, Rachael C. Amaro, Chunhai Bai, Kyle G. Dettman, Lluís Galbany, Daichi Hiramatsu, Bostroem K. Azalee, Koichi Itagaki, Saurabh W. Jha, Shuguo Ma, David J. Sand, Jennifer E. Andrews, Jacob Jencson, Peter Milne, Jeniveve Pearson, Manisha Shrestha, Nathan Smith, Réka Könyves-Tóth, Samuel Wyatt, Xuan Zhang, Shahidin Yaqup, Letian Wang, Mengfan Zhang   +39 more
doaj   +1 more source

Logarithmic and Strong Coupling Models in Weyl‐Type f(Q,T)$f(Q,T)$ Gravity

Annalen der Physik, Volume 538, Issue 1, January 2026.
This work explores Weyl‐type f(Q,T) gravity using recent observational datasets — CC, Pantheon+, Union 3.0, and DESI DR2. Through MCMC analysis of logarithmic and strong coupling models, the study reveals a transition from deceleration to acceleration, quintessence‐to‐phantom dynamics, and late‐time consistency with LCDM, offering a geometry‐driven ...
Rahul Bhagat, S. K. Tripathy, B. Mishra
wiley   +1 more source

Bump Morphology of the CMAGIC Diagram

The Astrophysical Journal, 2023
We apply the color–magnitude intercept calibration method (CMAGIC) to the Nearby Supernova Factory SNe Ia spectrophotometric data set. The currently existing CMAGIC parameters are the slope and intercept of a straight line fit to the linear region in the
L. Aldoroty, L. Wang, P. Hoeflich, J. Yang, N. Suntzeff, G. Aldering, P. Antilogus, C. Aragon, S. Bailey, C. Baltay, S. Bongard, K. Boone, C. Buton, Y. Copin, S. Dixon, D. Fouchez, E. Gangler, R. Gupta, B. Hayden, Mitchell Karmen, A. G. Kim, M. Kowalski, D. Küsters, P.-F. Léget, F. Mondon, J. Nordin, R. Pain, E. Pecontal, R. Pereira, S. Perlmutter, K. A. Ponder, D. Rabinowitz, M. Rigault, D. Rubin, K. Runge, C. Saunders, G. Smadja, N. Suzuki, C. Tao, R. C. Thomas, M. Vincenzi   +40 more
doaj   +1 more source

Nachtsicht ins All mit dem bloßen Auge: Sag mir, wie weit die Sterne steh'n

Physik in unserer Zeit, Volume 57, Issue 1, Page 32-40, January 2026.
Beim Blick in den Nachthimmel sehen wir ohne optische Hilfsmittel und abhängig von der lokalen Lichtverschmutzung viele Hundert bis maximal einige Tausend Sterne und auch einige Galaxien. Aber wie weit sind diese von uns entfernt? Und bis zu welchen maximalen Entfernungen können wir Objekte im Weltall mit dem bloßen Auge wahrnehmen?
Michael Vollmer
wiley   +1 more source

Type Ia Supernovae

Astronomy and Astrophysics Review, 2000
Type Ia Supernovae are in many aspects still enigmatic objects. Recent years have witnessed a bonanza of supernova observations. The increased samples from dedicated searches have allowed the statistical investigation of Type Ia Supernovae as a class.
openaire   +2 more sources

The Peculiar Type Ia Supernova 2005hk [PDF]

AIP Conference Proceedings, 2007
We present a preliminary analysis of an extensive set of optical observations of the Type Ia SN 2005hk. We show that the evolution of SN 2005hk closely follows that of the peculiar SN 2002cx. SN 2005hk is more luminous than SN 2002cx, while still under-luminous compared to normal Type Ia supernovae. The spectrum at 9 days before maximum is dominated by
Stanishev, V., Taubenberger, S., Blanc, G., Anupama, G., Benetti, S., Cappellaro, E., Elias-Rosa, N., Féron, C., Goobar, A., Krisciunas, K., Pastorello, A., Sahu, D., Salvo, M., Schmidt, B., Sollerman, J., Thöne, C., Turatto, M., Hillebrandt, W.   +17 more
openaire   +3 more sources

Propagating Uncertainties in the SALT3 Model-training Process to Cosmological Constraints

The Astrophysical Journal Supplement Series, 2023
Type Ia supernovae (SNe Ia) are standardizable candles that must be modeled empirically to yield cosmological constraints. To understand the robustness of this modeling to variations in the model-training procedure, we build an end-to-end pipeline to ...
M. Dai, D. O. Jones, W. D. Kenworthy, R. Kessler, J. D. R. Pierel, R. J. Foley, S. W. Jha, D. M. Scolnic   +7 more
doaj   +1 more source

Testing the Weak Cosmic Censorship Conjecture via Test Particle–Induced Overcharging/Overspinning of Kerr–Newman–Modified Gravity Black Hole

Advances in Astronomy, Volume 2026, Issue 1, 2026.
We examine the weak cosmic censorship conjecture (WCCC) violation by throwing a charged and rotating test particle into a Kerr–Newman–modified gravity black hole (KN–MOG BH). The result depends on several factors, such as the relative sign of the particle’s charge and its direction of rotation with respect to black hole (BH).
Waqar Ahmad, Abdul Rehman Kashif, Jose Gaite   +2 more
wiley   +1 more source

The Progenitors of Type Ia Supernovae [PDF]

Symposium - International Astronomical Union, 2003
Using binary population synthesis (BPS), we studied the birthrates of SNe Ia for two progenitor models – the single degenerate model and the double degenerate model. We find that the birthrates from both models are within a factor of a few comparable to those inferred observationally.
Han, Z, Podsiadlowski, P
openaire   +2 more sources

A JWST Medium-resolution MIRI Spectrum and Models of the Type Ia Supernova 2021aefx at +415 days

The Astrophysical Journal
We present a JWST MIRI medium-resolution spectrometer spectrum (5–27 μ m) of the Type Ia supernova (SN Ia) SN 2021aefx at +415 days past B -band maximum.
C. Ashall, P. Hoeflich, E. Baron, M. Shahbandeh, J. M. DerKacy, K. Medler, B. J. Shappee, M. A. Tucker, E. Fereidouni, T. Mera, J. Andrews, D. Baade, K. A. Bostroem, P. J. Brown, C. R. Burns, A. Burrow, A. Cikota, T. de Jaeger, A. Do, Y. Dong, I. Dominguez, O. Fox, L. Galbany, E. Y. Hsiao, K. Krisciunas, B. Khaghani, S. Kumar, J. Lu, J. R. Maund, P. Mazzali, N. Morrell, F. Patat, C. Pfeffer, M. M. Phillips, J. Schmidt, S. Stangl, C. P. Stevens, M. D. Stritzinger, N. B. Suntzeff, C. M. Telesco, L. Wang, Y. Yang   +41 more
doaj   +1 more source