Explanipedia

The power of binaries on stripped-envelope supernovae across metallicity: uniform progenitor parameter space and persistently low ejecta masses, but subtype diversity Open

Thallis Pessi, Mathieu Renzo, C. P. Gutiérrez, Jeff J. Andrews, Seth Gossage , et al. · 2025

Stripped-envelope supernovae (SESNe) originate from massive stars that lose their envelopes through binary interactions or stellar winds. The connection between SESN subtypes and their progenitors remains poorly understood, as does the inf…

SN 2021ukt: A Transitional Supernova with a Short Plateau and Persistent Interaction Open

D. Hiramatsu, C. P. Gutiérrez, Estefania Padilla Gonzalez, D. A. Howell, Megan Newsome , et al. · 2025

We present spectroscopic and photometric observations of supernova (SN) 2021ukt, a peculiar short-plateau object that was originally identified as a Type IIn SN and later underwent an unprecedented transition to a Type Ib (possibly Type II…

Detection of disk-jet co-precession in a tidal disruption event Open

Zikun Lin, Liusuo Wu, Wei‐Hua Lei, R. D. Baldi, Yang Huang , et al. · 2025

Theories and simulations predict that intense spacetime curvature near black holes bends the trajectories of light and matter, driving disk and jet precession under relativistic torques. However, direct observational evidence of disk-jet c…

The Type Ia Supernova 2021hem: A 2003fg-like Event in an Apparently Hostless Environment Open

A. Malmgaard, C. J. Miller, C. Ashall, C. R. Burns, J. M. DerKacy , et al. · 2025

We report observations of Type Ia SN 2021hem, located in an apparently hostless environment. With a peak absolute B-band magnitude of -19.96 mag, and a lack of secondary maximum in near-infrared and i-band light curves make it resemble 200…

Massive stars exploding in a He-rich circumstellar medium XII. SN 2024acyl: A fast, linearly declining Type Ibn supernova with early flash-ionisation features Open

Yongzhi Cai, A. Pastorello, Keiichi Maeda, Jiewei Zhao, Zirong Wang , et al. · 2025

We present a photometric and spectroscopic analysis of the Type Ibn supernova (SN) 2024acyl. It rises to an absolute magnitude peak of about -17.58 mag in 10.6 days, and displays a rapid linear post-peak light-curve decline in all bands, s…

SN 2024cld: unveiling the complex mass-loss histories of evolved supergiant progenitors to core collapse supernovae Open

T. Killestein, M. Pursiainen, R. Kotak, P. Charalampopoulos, J. Lyman , et al. · 2025

Pre-explosion mass loss in supernova (SN) progenitors is a crucial unknown factor in stellar evolution, yet has been illuminated recently by the diverse zoo of interacting transients. We present SN2024cld, a transitional core-collapse SN a…

Revisiting the unification of tidal disruption events with polarimetry Open

H. C. I. Wichern, G. Leloudas, M. Pursiainen, Aleksandar Cikota, Gaurava K. Jaisawal , et al. · 2025

Tidal disruptions of stars by supermassive black holes produce multi-wavelength emission, of which the optical emission is of ambiguous origin. A unification scenario of tidal disruption events (TDEs) has been proposed to explain the diffe…

HOLISMOKES XIX: SN 2025wny at $z=2$, the first strongly lensed superluminous supernova Open

S. Taubenberger, Ana Acebrón, R. Cañameras, T. W. Chen, A. Galan , et al. · 2025

We present imaging and spectroscopic observations of supernova SN 2025wny, associated with the lens candidate PS1 J0716+3821. Photometric monitoring from the Lulin and Maidanak observatories confirms multiple point-like images, consistent …

Direct Measurement of Galaxy Assembly Bias using DESI DR1 Data Open

Zhiwei Shao, Ying Zu, Andrés N. Salcedo, Jiaqi Wang, Xiaohu Yang , et al. · 2025

We report the first direct measurement of galaxy assembly bias, a critical systematic in cosmology, from the Dark Energy Spectroscopic Instrument (DESI) Bright Galaxy Survey. We introduce a novel, cosmology-independent method to measure th…

$H_0$ Without the Sound Horizon (or Supernovae): A 2% Measurement in DESI DR1 Open

E. A. Zaborowski, P. C. Taylor, Klaus Honscheid, Andrei Cuceu, Arnaud de Mattia , et al. · 2025

The sound horizon scale $r_s$ is a key source of information for early-time $H_0$ measurements, and is therefore a common target of new physics proposed to solve the Hubble tension. We present a sub-2% measurement of the Hubble constant th…

SN 2021tsz: A luminous, short photospheric phase Type II supernova in a low-metallicity host Open

R. Dastidar, G. Pignata, Naveen Dukiya, K. Misra, D.A. Howell , et al. · 2025

We present the analysis of the luminous Type II Supernova (SN) 2021tsz, which exploded in a low-luminosity galaxy. It reached a peak magnitude of −18.88 ± 0.13 mag in the r band and exhibited an initial rapid decline of 4.05 ± 0.14 mag (10…

SN 2021tsz: A luminous, short photospheric phase Type II supernova in a low-metallicity host Open

R. Dastidar, G. Pignata, Naveen Dukiya, K. Misra, D. A. Howell , et al. · 2025

We present the analysis of the luminous Type II Supernova (SN) 2021tsz, which exploded in a low-luminosity galaxy. It reached a peak magnitude of -18.88 $\pm$ 0.13 mag in the $r$ band and exhibited an initial rapid decline of 4.05 $\pm$ 0.…

Long-term evolution of the SN 2009ip-like transient SN 2016cvk Open

K. Matilainen, E. Kankare, S. Mattila, A. Reguitti, G. Pignata , et al. · 2025

Aims. The interacting transient SN 2016cvk (ASASSN-16jt) is a peculiar SN 2009ip-like event. We present our follow-up data with an aim to draw conclusions on the physical nature of the progenitor system. Methods. Our spectrophotometric dat…

Probing the limits of cosmological information from the Lyman-$α$ forest 2-point correlation functions Open

W. Turner, Andrei Cuceu, Paul Martini, J. Aguilar, S. P. Ahlen , et al. · 2025

The standard cosmological analysis with the Ly$α$ forest relies on a continuum fitting procedure that suppresses information on large scales and distorts the three-dimensional correlation function on all scales. In this work, we present th…

DESI DR1 Ly$α$ 1D power spectrum: Validation of estimators Open

Naim Göksel Karaçaylı, C. Ravoux, Paul Martini, Jean-Marc Le Goff, E. Armengaud , et al. · 2025

The Data Release 1 (DR1) of the Dark Energy Spectroscopic Instrument (DESI) is the largest sample to date for small-scale Ly$α$ forest cosmology, accessed through its one-dimensional power spectrum ($P_{\mathrm{1D}}$). The Ly$α$ forest $P_…

The bright long-lived Type II SN 2021irp powered by aspherical circumstellar material interaction Open

Tim Reynolds, T. Nagao, Kenji Maeda, N. Elias-Rosa, M. Fraser , et al. · 2025

Context. There is evidence of interaction between supernova (SN) ejecta and massive circumstellar material (CSM) among various types of SNe. The mass-ejection mechanisms that produce a massive CSM are unclear. Therefore, studying interacti…

The bright long-lived Type II SN 2021irp powered by aspherical circumstellar material interaction Open

Tim Reynolds, T. Nagao, Rashmi Gottumukkala, C. P. Gutiérrez, T. Kangas , et al. · 2025

Context. Some core-collapse supernovae (CCSNe) are too luminous and radiate too much total energy to be powered by the release of thermal energy from the ejecta and radioactive-decay energy from the synthesised 56 Ni/ 56 Co. A source of ad…

One Year of SN 2023ixf: Breaking through the Degenerate Parameter Space in Light-curve Models with Pulsating Progenitors Open

Brian Hsu, Nathan Smith, Jared A. Goldberg, K. Azalee Bostroem, G. Hosseinzadeh , et al. · 2025

We present and analyze the extensive optical broadband photometry of the Type II SN 2023ixf up to 1 yr after explosion. We find that, when compared to two preexisting model grids, the bolometric light curve is consistent with drastically d…

Statistical analysis of early spectra in type II and IIb supernovae Open

Maider González-Bañuelos, C. P. Gutiérrez, L. Galbany, S. González–Gaitán · 2025

We present a comprehensive analysis of the early spectra of type II and type IIb supernovae (SNe) to explore their diversity and distinguishable characteristics. Using 866 publicly available spectra from 393 SNe, including 407 from type II…

The La Silla Schmidt Southern Survey Open

A. A. Miller, Natasha S. Abrams, G. Aldering, Shreya Anand, C. R. Angus , et al. · 2025

We present the La Silla Schmidt Southern Survey (LS4), a new wide-field, time-domain survey to be conducted with the 1 m ESO Schmidt telescope. The 268 megapixel LS4 camera mosaics 32 2k × 4k fully depleted CCDs, providing a ∼20 deg 2 fiel…

The ambiguous AT2022rze: changing-look AGN mimicking a supernova in a merging galaxy system Open

P. J. Pessi, J. Sollerman, Lin Yan, A. Le Reste, Yuhan Yao , et al. · 2025

AT2022rze is a luminous, ambiguous transient located south-east of the geometric centre of its host galaxy at redshift $z = 0.08$. The host appears to be formed by a merging galaxy system. The observed characteristics of AT2022rze are remi…

The power of binaries on stripped-envelope supernovae across metallicity: uniform progenitor parameter space and persistently low ejecta masses, but subtype diversity Open

Dimitris Souropanis, Emmanouil Zapartas, T. Pessi, Max M. Briel, Mathieu Renzo , et al. · 2025

Stripped-envelope supernovae (SESNe) originate from massive stars that lose their envelopes through binary interactions or stellar winds. The connection between SESN subtypes and their progenitors remains poorly understood, as does the inf…

DESI DR1 Lyα 1D power spectrum: The optimal estimator measurement Open

Naim Göksel Karaçaylı, Paul Martini, José Aguilar, S. P. Ahlen, E. Armengaud , et al. · 2025

Supplementary material to DESI's publication DESI DR1 Lyα 1D power spectrum: The optimal estimator measurement from DESI’s first-year quasar sample to comply with the data management plan. You can read these files using astrop.io.ascii.rea…

SN 2024hpj: a perspective on SN 2009ip-like events Open

I. Salmaso, A. Pastorello, E. Borsato, S. Benetti, M. T. Botticella , et al. · 2025

Supernovae (SNe) IIn are terminal explosions of massive stars that are surrounded by a dense circumstellar medium (CSM). Among SNe IIn, a notable subset is the SNe 2009ip-like, which exhibit an initial, fainter peak attributed to stellar v…

Rapid follow-up observations of infant supernovae with the Gran Telescopio Canarias Open

L. Galbany, C. P. Gutiérrez, L. Piscarreta, A. Alburai, Noor Ali , et al. · 2025

The first few hours of a supernova (SN) contain significant information about the progenitor system. The most modern wide-field surveys that scan the sky repeatedly every few days can discover all kinds of transients in those early epochs.…

SN 2022jli modeled with a <sup>56</sup>Ni double layer and a magnetar Open

M. Orellana, Melina C. Bersten, C. P. Gutiérrez · 2025

Context. We study the bolometric evolution of the exceptional Type Ic supernova SN 2022jli, aiming to understand the underlying mechanisms responsible for its distinctive double-peaked light curve morphology, extended timescales, and the r…

A long-lasting eruption heralds SN 2023ldh, a clone of SN 2009ip Open

A. Pastorello, A. Reguitti, L. Tartaglia, G. Valerin, Yongzhi Cai , et al. · 2025

We discuss the results of the spectroscopic and photometric monitoring of the type IIn supernova (SN) 2023ldh. Survey archive data show that the SN progenitor experienced erratic variability in the years before exploding. Beginning May 202…

Inference of matter power spectrum at z=0 using DESI DR1 Full-Shape data Open

R. Cereskaite, Eva-Maria Mueller, Cullan Howlett, T. M. Davis, José Aguilar , et al. · 2025

Measurements of galaxy distributions at large cosmic distances capture clustering from the past. In this study, we use a cosmological model to translate these observations into the present-day galaxy distribution. Specifically, we reconstr…

New X-ray supernova remnants in NGC 7793 Open

M. Kopsacheili, K. Anastasopoulou, Rita Nanda, C. P. Gutiérrez, L. Galbany · 2025

Context. This work focuses on the detection of X-ray supernova remnants (SNRs) in the galaxy NGC 7793 and the study of their properties. Aims. X-ray SNRs in galaxies beyond the Local Group are rare, mainly due to the limited sensitivity of…

The Type I superluminous supernova catalogue – II. Spectroscopic evolution in the photospheric phase, velocity measurements, and constraints on diversity Open

A. Aamer, M. Nicholl, Sebastián Gómez, E. Berger, P. K. Blanchard , et al. · 2025

Hydrogen-poor superluminous supernovae (SLSNe) are among the most energetic explosions in the universe, reaching luminosities up to 100 times greater than those of normal supernovae. This paper presents the largest compilation of SLSN phot…

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