Article
Astronomy & Astrophysics
Danfeng Xiang, Xiaofeng Wang, Xinghan Zhang, Hanna Sai, Jujia Zhang, Thomas G. Brink, Alexei Filippenko, Jun Mo, Tianmeng Zhang, Zhihao Chen, Luc Dessart, Zhitong Li, Shengyu Yan, Sergei Blinnikov, Liming Rui, E. Baron, J. M. DerKacy
Summary: We present extensive observations and analysis for the nearby SN 1987A-like peculiar Type II supernova (SN) 2018hna. The observations cover phases extending to >500 days after the explosion, making it one of the best-observed SN II of this subtype. The analysis suggests that SN 2018hna has a higher photospheric temperature and a smaller progenitor radius compared to SN 1987A. By fitting the bolometric light curve with hydrodynamical models, the study estimates the ejecta mass, kinetic energy, and Ni-56 mass of SN 2018hna. The study also discusses the possible mechanisms and scenarios for the formation of SN 2018hna.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Schuyler D. Van Dyk, K. Azalee Bostroem, WeiKang Zheng, Thomas G. Brink, Ori D. Fox, Jennifer E. Andrews, Alexei Filippenko, Yize Dong, Emily Hoang, Griffin Hosseinzadeh, Daryl Janzen, Jacob E. Jencson, Michael J. Lundquist, Nicolas Meza, Dan Milisavljevic, Jeniveve Pearson, David J. Sand, Manisha Shrestha, Stefano Valenti, D. Andrew Howell
Summary: The study reports on the use of JWST to identify a potential progenitor star for the Type II-plateau supernova SN 2022acko. This is the first time JWST has been used to locate a progenitor system in pre-explosion HST images. By accurately aligning the JWST image with the pre-SN HST images, a candidate object corresponding to the SN position has been identified. The significance of this study lies in the new era of using JWST to identify supernova progenitor candidates at high spatial resolution.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
T. Kangas, A. Ahola, C. Fransson, J. Larsson, P. Lundqvist, S. Mattila, B. Leibundgut
Summary: We used adaptive optics imaging and integral field spectroscopy to study the NIR evolution of SN 1987A's equatorial ring. The NIR flux and morphology were monitored over time as groundwork for future observations. Differences in ring structure and flux at different wavelengths were analyzed to understand the physical processes. The results showed similarities between NIR and optical evolution, with skewed morphology towards the west side of the ring since 2010. The NIR continuum emission expanded more slowly than the MIR dust emission, indicating a different source.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
D. O'Neill, R. Kotak, M. Fraser, S. Mattila, G. Pietrzynski, J. L. Prieto
Summary: By combining mid-IR data with dust models, researchers found that the progenitor of SN 2008bk is likely a cool red supergiant with a luminosity of about 4.53. The inferred progenitor mass of 8-10 M⊙ is consistent with previous studies, suggesting that low-luminosity type IIP SNe may come from the explosion of red supergiant stars at the lower extremum for core collapse.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Han Lin, Xiaofeng Wang, Jujia Zhang, Weili Lin, Jun Mo, Alexei Filippenko, WeiKang Zheng, Peter J. Brown, Danfeng Xiang, Fang Huang, Yongzhi Cai, Tianmeng Zhang, Xue Li, Liming Rui, Xinghan Zhang, Hanna Sai, Xulin Zhao, Melissa L. Graham, I Shivvers, G. Halevi, H. Yuk, Thomas G. Brink
Summary: The study presents optical and ultraviolet photometry, as well as optical spectra of the type II supernova (SN) 2015bf. The observations reveal a high peak luminosity and fast post-peak decline of SN 2015bf, suggesting a small amount of synthesized Ni-56 during the explosion. The disappearance of flash features within the first week after explosion indicates violent mass loss of the progenitor shortly before the supernova explosion.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
S. J. Brennan, N. Elias-Rosa, M. Fraser, S. D. Van Dyk, J. D. Lyman
Summary: Researchers present recent observations from the Hubble Space Telescope of the interacting transient SN 2016jbu at +5 yr, finding no evidence of additional outbursts and a significant fade in the optical source. The supernova is fading more slowly than expected of radioactive nickel, but faster than SN 2009ip, with continued dominance of CSM interaction.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
N. N. Chugai
Summary: The study explores the circumstellar H alpha and H beta absorption lines in the spectrum of the luminous type IIL SN 2008fq, suggesting interaction with a confined dense shell. Modelling of a similar type IIL SN 1998S indicates a comparable shell mass. The larger confined dense shell mass in type IIL supernovae compared to type IIP supernovae is attributed to the larger progenitor mass.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
T. Kangas, C. Fransson, J. Larsson, K. France, R. A. Chevalier, R. P. Kirshner, P. Lundqvist, S. Mattila, J. Sollerman, V. P. Utrobin
Summary: This study presents spectroscopy of the ejecta of SN 1987A, revealing the morphology and evolution of emission lines. The Mg II line shows a blueshift and a significant increase in brightness since 1999. It is found that thermal excitation and Ly alpha fluorescence are the dominant power sources for the ultraviolet and infrared Mg II lines, respectively. This research also examines the spectra of hotspots outside the equatorial ring, providing insights into the interaction of fast ejecta and a clumpy, slowly moving outflow.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Nathan Smith, Jennifer E. Andrews, Alexei Filippenko, Ori D. Fox, Jon C. Mauerhan, Schuyler D. Van Dyk
Summary: New Hubble Space Telescope imaging data shows that the optical source at the site of the Type IIn supernova 2009ip has continued to fade steadily since the supernova-like event in 2012. The source is now fainter than its quiescent progenitor and previous outbursts, ruling out previous predictions that it would return to its previous state. The fading matches expectations for a terminal explosion, and there are no significant color changes or dust-obscured survivor indications. The late-time continuum and H alpha emission are consistent with shock interaction with circumstellar material. The ultraviolet flux has remained constant since 2015, supporting the idea that it traces OB stars in a young star cluster.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Ko Nakamura, Tomoya Takiwaki, Kei Kotake
Summary: In this study, a self-consistent, non-rotating core-collapse supernova simulation is conducted in three spatial dimensions using a binary evolution progenitor model of SN 1987A. The simulation successfully reproduces several observational constraints of SN 1987A, including the evolution, mass, and position on the Hertzsprung-Russell diagram at collapse. The simulation also predicts the formation of a newly born neutron star with specific gravitational mass and spin period. However, the simulation results show some discrepancies with the observed values, suggesting the need for further improvements in the models.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
J. Teffs, P. A. Mazzali, K. Medler, S. Hachinger
Summary: Using a combined spectral and light-curve modelling approach, a massive and energetic explosion model was fitted to the luminous Type Ib/IIb SN 2020cpg. The model suggested an ejected mass of around 7 solar masses, with a final explosion energy of approximately 6 x 10^51 erg and M-Ni of 0.27 solar masses. The early spectra showed hot and blue characteristics with weak He I lines, and a complex H alpha region. The modelling of the spectra required a significant amount of H and He masses at high velocities.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
E. D. Hueichapan, C. Contreras, R. Cartier, P. Lira, P. Sanchez-Saez, B. Milvang-Jensen, J. P. U. Fynbo, J. P. Anderson, M. Hamuy
Summary: In this study, we present the optical and near-infrared photometry of the superluminous supernova UID 30901. By analyzing the image of the host galaxy and assuming a photometric redshift, we fit a blackbody model and find that the magnetar model is consistent with the observations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Alexandra Kozyreva, Hans-Thomas Janka, Daniel Kresse, Stefan Taubenberger, Petr Baklanov
Summary: This study re-evaluates the observational data of supernova SN 2020cxd and computes the diagnostic properties using a hydrodynamic explosion model. The results show that the model can well reproduce the light curves and emission properties, with lower explosion energy and ejecta mass compared to previous reports. The overestimated line velocities may indicate the intrinsic asymmetries in the supernova ejecta.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Z. Keszthelyi, G. Meynet, F. Martins, A. de Koter, A. David-Uraz
Summary: tau Sco is a magnetic B-type star with surprising characteristics such as slow rotation and nitrogen excess. To reconcile its properties with single-star models, an increase in the efficiency of rotational mixing and magnetic braking is necessary.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
K. Ertini, G. Folatelli, L. Martinez, M. C. Bersten, J. P. Anderson, C. Ashall, E. Baron, S. Bose, P. J. Brown, C. Burns, J. M. Derkacy, L. Ferrari, L. Galbany, E. Hsiao, S. Kumar, J. Lu, P. Mazzali, N. Morrell, M. Orellana, P. J. Pessi, M. M. Phillips, A. L. Piro, A. Polin, M. Shahbandeh, B. J. Shappee, M. Stritzinger, N. B. Suntzeff, M. Tucker, N. Elias-Rosa, H. Kuncarayakti, C. P. Gutierrez, A. Kozyreva, T. E. Mueller-Bravo, T. -w Chen, J. T. Hinkle, A. Payne, P. Szekely, T. Szalai, B. Barna, R. Koenyves-Toth, D. Banhidi, I. B. Biro, I Csanyi, L. Kriskovits, A. Pal, Zs Szabo, R. Szakats, K. Vida, J. Vinko, M. Gromadzki, L. Harvey, M. Nicholl, E. Paraskeva, D. R. Young, B. Englert
Summary: We present extensive follow-up observations of supernova 2021gno, including photometric and spectroscopic analysis. The supernova belongs to the Calcium-rich transients family and exhibits intermediate luminosity, fast photometric evolution, and double-peaked light curves. The observations suggest that it resulted from the explosion of a highly stripped massive star. The presence of hydrogen features in the spectra and their implications on progenitor scenarios for Calcium-rich transients are also discussed.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
N. Langer, C. Schuermann, K. Stoll, P. Marchant, D. J. Lennon, L. Mahy, S. E. de Mink, M. Quast, W. Riedel, H. Sana, P. Schneider, A. Schootemeijer, C. Wang, L. A. Almeida, J. M. Bestenlehner, J. Bodensteiner, N. Castro, S. Clark, P. A. Crowther, P. Dufton, C. J. Evans, L. Fossati, G. Graefener, L. Grassitelli, N. Grin, B. Hastings, A. Herrero, A. de Koter, A. Menon, L. Patrick, J. Puls, M. Renzo, A. A. C. Sander, F. R. N. Schneider, K. Sen, T. Shenar, S. Simon-Dias, T. M. Tauris, F. Tramper, J. S. Vink, X-T Xu
ASTRONOMY & ASTROPHYSICS
(2020)
Article
Astronomy & Astrophysics
G. Holgado, S. Simon-Diaz, L. Haemmerle, D. J. Lennon, R. H. Barba, M. Cervino, N. Castro, A. Herrero, G. Meynet, J. Arias
ASTRONOMY & ASTROPHYSICS
(2020)
Article
Astronomy & Astrophysics
S. Burssens, S. Simon-Diaz, D. M. Bowman, G. Holgado, M. Michielsen, A. de Burgos, N. Castro, R. H. Barba, C. Aerts
ASTRONOMY & ASTROPHYSICS
(2020)
Article
Astronomy & Astrophysics
J. Alonso-Santiago, I Negueruela, A. Marco, H. M. Tabernero, N. Castro
ASTRONOMY & ASTROPHYSICS
(2020)
Article
Astronomy & Astrophysics
N. Castro, P. A. Crowther, C. J. Evans, J. S. Vink, J. Puls, A. Herrero, M. Garcia, F. J. Selman, M. M. Roth, S. Simon-Diaz
Summary: In this study, spectroscopic analysis of 333 OB-type stars in the central region of NGC 2070 in the Tarantula Nebula on the Large Magellanic Cloud was conducted, revealing two main sequence groups with estimated ages of 2.1 +/- 0.8 and 6.2 +/- 2 Myr. It was also observed that the stellar masses derived from the sHRD were systematically larger than those obtained from the conventional HRD, especially for the most massive stars.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
S. Martinet, G. Meynet, S. Ekstroem, S. Simon-Diaz, G. Holgado, N. Castro, C. Georgy, P. Eggenberger, G. Buldgen, S. Salmon, R. Hirschi, J. Groh, E. Farrell, L. Murphy
Summary: Spectroscopic studies of Galactic O and B stars suggest that the convective core sizes in stars more massive than about 8 solar masses at the end of the main sequence phase may be larger than predicted by stellar models. By combining stellar evolution models with spectroscopic parameters, the study examines the convective core size in massive stars and finds tensions among different methods for stars more massive than 15 solar masses.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Miriam Garcia, Christopher J. Evans, Joachim M. Bestenlehner, Jean Claude Bouret, Norberto Castro, Miguel Cervino, Alexander W. Fullerton, Mark Gieles, Artemio Herrero, Alexander de Koter, Daniel J. Lennon, Jacco Th van Loon, Fabrice Martins, Selma E. de Mink, Francisco Najarro, Ignacio Negueruela, Hugues Sana, Sergio Simon-Diaz, Dorottya Szecsi, Frank Tramper, Jorick S. Vink, Aida Wofford
Summary: The history of the universe has witnessed the importance of massive stars in energizing galaxies with various elements. However, more research is needed to understand the formation and evolution of metal-poor massive stars.
EXPERIMENTAL ASTRONOMY
(2021)
Article
Astronomy & Astrophysics
G. Gonzalez-Tora, M. A. Urbaneja, N. Przybilla, S. Dreizler, M. M. Roth, S. Kamann, N. Castro
Summary: A quantitative spectral analysis was conducted on BA-type supergiants and bright giants in NGC 300, using the Multi Unit Spectroscopic Explorer. The study extended the flux-weighted gravity-luminosity relationship to lower luminosities and found an increase in scatter in the flux-weighted gravity-luminosity plane.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Chen Wang, Norbert Langer, Abel Schootemeijer, Antonino Milone, Ben Hastings, Xiao-Tian Xu, Julia Bodensteiner, Hugues Sana, Norberto Castro, D. J. Lennon, Pablo Marchant, A. de Koter, Selma E. de Mink
Summary: The slowly rotating, blue fraction of main-sequence stars in young star clusters may originate from binary star mergers. Their peculiar mass function suggests their unusual formation path, possibly through binary mergers. These findings shed new light on the origin of the bimodal mass, spin and magnetic-field distributions of main-sequence stars.
Article
Astronomy & Astrophysics
M. Lorenzo, M. Garcia, F. Najarro, A. Herrero, M. Cervino, N. Castro
Summary: Local Group (LG) very metal-poor massive stars are essential for understanding the first stars of the Universe and the evolution of early galaxies. However, comprehensive spectroscopic studies at metallicities lower than the Small Magellanic Cloud (SMC) have been limited due to the great distance. This study presents a collection of low-resolution spectroscopic data of more than 150 OB stars in the galaxy Sextans A, allowing for a better understanding of the evolutionary pathways and fates of very metal-poor massive stars.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Genoveva Micheva, Martin M. Roth, Peter M. Weilbacher, Christophe Morisset, Norberto Castro, Ana Monreal Ibero, Azlizan A. Soemitro, Michael V. Maseda, Matthias Steinmetz, Jarle Brinchmann
Summary: This study investigates a sample of 390 extremely faint H II regions in the flocculent spiral galaxy NGC 300 and compares their physical properties with diffuse ionized gas (DIG).
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Matthew M. Dallas, M. S. Oey, Norberto Castro
Summary: Classical OBe stars in the Small Magellanic Cloud obtain their rapid rotation from mass and angular momentum transfer in massive binaries, and subsequent supernovae eject them into space.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Irene Vargas-Salazar, M. S. Oey, Jesse R. Barnes, Xinyi Chen, N. Castro, Kaitlin M. Kratter, Timothy A. Faerber
ASTROPHYSICAL JOURNAL
(2020)
Article
Astronomy & Astrophysics
J. Dorigo Jones, M. S. Oey, K. Paggeot, N. Castro, M. Moe
ASTROPHYSICAL JOURNAL
(2020)
Article
Astronomy & Astrophysics
G. A. Wade, S. Bagnulo, Z. Keszthelyi, C. P. Folsom, E. Alecian, N. Castro, A. David-Uraz, L. Fossati, V Petit, M. E. Shultz, J. Sikora
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)