Explanipedia

Spectral Diversity in Type Ibn Supernovae and the Large Host Offset of SN2024acyl Open

Yize Dong, V. Ashley Villar, Anya E. Nugent, G. Hosseinzadeh, R. J. Foley , et al. · 2025

In this paper, we first present observations of SN~2024acyl, a normal Type Ibn supernova with a large projected offset ($\sim$35~kpc) from its host galaxy. The low star-formation rate measured at the explosion site raises the possibility t…

Mid-infrared Dust Evolution and Late-time Circumstellar Medium Interaction in SN 2017eaw Open

Jeniveve Pearson, Bhagya Subrayan, David J. Sand, Jennifer E. Andrews, Emma R. Beasor , et al. · 2025

We present JWST/Mid-Infrared Instrument (MIRI) and complementary ground-based near-infrared observations of the Type II SN 2017eaw taken 6 yr postexplosion. SN 2017eaw is still detected out to 25 μ m and there is minimal evolution in the m…

SN 2019hnl: A Type IIP Supernova with a Partially Stripped, Low-mass Progenitor Open

Aidan Martas, S. Valenti, Aravind P. Ravi, Yize Dong, K. Azalee Bostroem , et al. · 2025

We present optical photometry and spectroscopy of SN 2019hnl. Discovered within ∼26 hr of explosion by the ATLAS survey, SN 2019hnl is a typical Type IIP supernova (SN) with a peak absolute V -band magnitude of −16.7 ± 0.1 mag, a plateau l…

Near-infrared spectroscopy and detection of carbon monoxide in the Type II supernova SN 2023ixf Open

Seong Hyun Park, Jeonghee Rho, Sung-Chul Yoon, Jeniveve Pearson, Manisha Shrestha , et al. · 2025

Context. Core-collapse supernovae (CCSNe) may have contributed a significant amount of dust in the early Universe. Freshly formed coolant molecules (e.g., CO) and warm dust can be found in CCSNe as early as ∼100 d after the SN explosion, a…

Early Shock Cooling Observations and Progenitor Constraints of Type IIb Supernova SN 2024uwq Open

Bhagya Subrayan, David J. Sand, K. Azalee Bostroem, Saurabh W. Jha, Aravind P. Ravi , et al. · 2025

We present early multiwavelength photometric and spectroscopic observations of the Type IIb supernova SN 2024uwq, capturing its shock-cooling emission phase and double-peaked light-curve evolution. Early spectra reveal broad H α ( v ∼ 15,5…

Late-time Hubble Space Telescope Ultraviolet Spectra of SN 2023ixf and SN 2024ggi Show Ongoing Interaction with Circumstellar Material Open

K. Azalee Bostroem, S. Valenti, David J. Sand, Jeniveve Pearson, Manisha Shrestha , et al. · 2025

We present far- and near-ultraviolet (UV) spectra of the Type II supernovae (SNe) SN~2023ixf from days 199 to 722 and SN~2024ggi at days 41 and 232. Both supernovae show broad, blueshifted, and asymmetric UV emission lines with an initial …

Near-Infrared Spectroscopy and Detection of Carbon Monoxide in the Type II Supernova SN 2023ixf Open

Seong Hyun Park, Jeonghee Rho, Sung-Chul Yoon, Jeniveve Pearson, Manisha Shrestha , et al. · 2025

Core-collapse supernovae (CCSNe) may contribute a significant amount of dust in the early universe. Freshly formed coolant molecules (e.g., CO) and warm dust can be found in CCSNe as early as ~100 d after the explosion, allowing the study …

A Near-infrared Search for Helium in the Superluminous Supernova SN 2024ahr Open

Harsh Kumar, E. Berger, P. K. Blanchard, Sebastián Gómez, D. Hiramatsu , et al. · 2025

We present a detailed study of SN 2024ahr, a hydrogen-poor superluminous supernova (SLSN-I), for which we determine a redshift of z = 0.0861. SN 2024ahr has a peak absolute magnitude of M g ≈ M r ≈ −21 mag, rest-frame rise and decline time…

SN 2023ehl: A Normal Type Ia Supernova with High-velocity Features Open

Xiangyun Zeng, Lei Hu, Sheng Zheng, Xiaolong Li, Xiaoyu Luo , et al. · 2025

SN 2023ehl, a normal Type Ia supernova with a typical decline rate, was discovered in the galaxy UGC 11555 and offers valuable insights into the explosion mechanisms of white dwarfs. We present a detailed analysis of SN 2023ehl, including …

JWST and Ground-based Observations of the Type Iax Supernovae SN 2024pxl and SN 2024vjm: Evidence for Weak Deflagration Explosions Open

Lindsey A. Kwok, Mridweeka Singh, Saurabh W. Jha, S. Blondin, Raya Dastidar , et al. · 2025

We present panchromatic optical $+$ near-infrared (NIR) $+$ mid-infrared (MIR) observations of the intermediate-luminosity Type Iax supernova (SN Iax) 2024pxl and the extremely low-luminosity SN Iax 2024vjm. JWST observations provide unpre…

Early Shock-Cooling Observations and Progenitor Constraints of Type IIb SN 2024uwq Open

Bhagya Subrayan, David J. Sand, K. Azalee Bostroem, Saurabh W. Jha, Aravind P. Ravi , et al. · 2025

We present early multi-wavelength photometric and spectroscopic observations of the Type IIb supernova SN 2024uwq, capturing its shock-cooling emission phase and double-peaked light curve evolution. Early spectra reveal broad H-alpha (v ~ …

Photometry and Spectroscopy of SN 2024pxl: A Luminosity Link Among Type Iax Supernovae Open

Mridweeka Singh, Lindsey A. Kwok, Saurabh W. Jha, Raya Dastidar, Conor Larison , et al. · 2025

We present extensive ultraviolet to optical photometric and optical to near-infrared (NIR) spectroscopic follow-up observations of the nearby intermediate-luminosity ($M_V = -$16.81$\pm$0.19~mag) Type Iax supernova (SN) 2024pxl in NGC 6384…

Spectropolarimetry of SN 2023ixf Reveals Both Circumstellar Material and an Aspherical Helium Core Open

Manisha Shrestha, Sabrina DeSoto, David J. Sand, G. G. Williams, Jennifer L. Hoffman , et al. · 2025

We present multi-epoch optical spectropolarimetric and imaging polarimetric observations of the nearby Type II supernova (SN) 2023ixf discovered in M101 at a distance of 6.85 Mpc. The first imaging polarimetric observations were taken +2.3…

Luminous Type II Short-plateau SN 2023ufx: Asymmetric Explosion of a Partially Stripped Massive Progenitor Open

Aravind P. Ravi, S. Valenti, Yize Dong, D. Hiramatsu, Stan Barmentloo , et al. · 2025

We present supernova (SN) 2023ufx, a unique Type IIP SN with the shortest known plateau duration ( t PT ∼ 47 days), a luminous V -band peak ( M V = −18.42 ± 0.08 mag), and a rapid early decline rate ( s 1 = 3.47 ± 0.09 mag (50 days) …

A Near-IR Search for Helium in the Superluminous Supernova SN 2024ahr Open

Harsh Kumar, E. Berger, P. K. Blanchard, Sebastián Gómez, D. Hiramatsu , et al. · 2025

We present a detailed study of SN 2024ahr, a hydrogen-poor superluminous supernova (SLSN-I), for which we determine a redshift of $z=0.0861$. SN 2024ahr has a peak absolute magnitude of $M_g\approx M_r\approx -21$ mag, rest-frame rise and …

SN2023fyq: A Type Ibn Supernova with Long-standing Precursor Activity Due to Binary Interaction Open

Yize Dong, D. Tsuna, S. Valenti, David J. Sand, Jennifer E. Andrews , et al. · 2024

We present photometric and spectroscopic observations of SN 2023fyq, a Type Ibn supernova (SN) in the nearby galaxy NGC 4388 ( D ≃ 18 Mpc). In addition, we trace the 3 yr long precursor emission at the position of SN 2023fyq using data fro…

Luminous Type II Short-Plateau SN 2023ufx: Asymmetric Explosion of a Partially-Stripped Massive Progenitor Open

Aravind P. Ravi, S. Valenti, Yize Dong, D. Hiramatsu, Stan Barmentloo , et al. · 2024

We present supernova (SN) 2023ufx, a unique Type IIP SN with the shortest known plateau duration ($t_\mathrm{PT}$ $\sim$47 days), a luminous V-band peak ($M_{V}$ = $-$18.42 $\pm$ 0.08 mag), and a rapid early decline rate ($s1$ = 3.47 $\pm$…

Spectropolarimetry of SN 2023ixf reveals both circumstellar material and helium core to be aspherical Open

Manisha Shrestha, Sabrina DeSoto, David J. Sand, G. G. Williams, Jennifer L. Hoffman , et al. · 2024

We present multi-epoch optical spectropolarimetric and imaging polarimetric observations of the nearby Type II supernova (SN) 2023ixf discovered in M101 at a distance of 6.85 Mpc. The first imaging polarimetric observations were taken +2.3…

Characterizing the Rapid Hydrogen Disappearance in SN 2022crv: Evidence of a Continuum between Type Ib and IIb Supernova Properties Open

Yize Dong, S. Valenti, C. Ashall, Marc Williamson, David J. Sand , et al. · 2024

We present optical and near-infrared (NIR) observations of SN 2022crv, a stripped-envelope supernova in NGC 3054, discovered within 12 hr of explosion by the Distance Less Than 40 Mpc Survey. We suggest that SN 2022crv is a transitional ob…

Circumstellar Interaction in the Ultraviolet Spectra of SN 2023ixf 14–66 Days After Explosion Open

K. Azalee Bostroem, David J. Sand, Luc Dessart, Nathan Smith, Saurabh W. Jha , et al. · 2024

SN 2023ixf was discovered in M101 within a day of the explosion and rapidly classified as a Type II supernova with flash features. Here we present ultraviolet (UV) spectra obtained with the Hubble Space Telescope 14, 19, 24, and 66 days af…

Extended Shock Breakout and Early Circumstellar Interaction in SN 2024ggi Open

Manisha Shrestha, K. Azalee Bostroem, David J. Sand, G. Hosseinzadeh, Jennifer E. Andrews , et al. · 2024

We present high-cadence photometric and spectroscopic observations of supernova (SN) 2024ggi, a Type II SN with flash spectroscopy features, which exploded in the nearby galaxy NGC 3621 at ∼7 Mpc. The light-curve evolution over the first 3…

Extended Shock Breakout and Early Circumstellar Interaction in SN 2024ggi Open

Manisha Shrestha, K. Azalee Bostroem, David J. Sand, G. Hosseinzadeh, Jennifer E. Andrews , et al. · 2024

We present high-cadence photometric and spectroscopic observations of supernova (SN) 2024ggi, a Type II SN with flash spectroscopy features which exploded in the nearby galaxy NGC 3621 at $\sim$7 Mpc. The light-curve evolution over the fir…

SN2023fyq: A Type Ibn Supernova With Long-standing Precursor Activity Due to Binary Interaction Open

Yize Dong, D. Tsuna, S. Valenti, David J. Sand, Jennifer E. Andrews , et al. · 2024

We present photometric and spectroscopic observations of SN 2023fyq, a type Ibn supernova in the nearby galaxy NGC 4388 (D$\simeq$18~Mpc). In addition, we trace long-standing precursor emission at the position of SN 2023fyq using data from…

Evidence of Weak Circumstellar Medium Interaction in the Type II SN 2023axu Open

Manisha Shrestha, Jeniveve Pearson, S. Wyatt, David J. Sand, G. Hosseinzadeh , et al. · 2024

We present high-cadence photometric and spectroscopic observations of SN 2023axu, a classical Type II supernova with an absolute V -band peak magnitude of –17.2 ± 0.1 mag. SN 2023axu was discovered by the Distance Less Than 40 Mpc (DLT40) …

Strong Carbon Features and a Red Early Color in the Underluminous Type Ia SN 2022xkq Open

Jeniveve Pearson, David J. Sand, P. Lundqvist, L. Galbany, Jennifer E. Andrews , et al. · 2023

We present optical, infrared, ultraviolet, and radio observations of SN 2022xkq, an underluminous fast-declining Type Ia supernova (SN Ia) in NGC 1784 ( D ≈ 31 Mpc), from <1 to 180 days after explosion. The high-cadence observations of SN …

Evidence of weak circumstellar medium interaction in the Type II SN 2023axu Open

Manisha Shrestha, Jeniveve Pearson, S. Wyatt, David J. Sand, G. Hosseinzadeh , et al. · 2023

We present high-cadence photometric and spectroscopic observations of SN~2023axu, a classical Type II supernova with an absolute $V$-band peak magnitude of $-16.5 \pm 0.1$ mag. SN~2023axu was discovered by the Distance Less Than 40 Mpc (DL…

Characterizing the Rapid Hydrogen Disappearance in SN2022crv: Evidence of a Continuum between Type Ib and IIb Supernova Properties Open

Yize Dong, S. Valenti, C. Ashall, Marc Williamson, David J. Sand , et al. · 2023

We present optical and near-infrared observations of SN~2022crv, a stripped envelope supernova in NGC~3054, discovered within 12 hrs of explosion by the Distance Less Than 40 Mpc Survey. We suggest SN~2022crv is a transitional object on th…

Strong Carbon Features and a Red Early Color in the Underluminous Type Ia SN 2022xkq Open

Jeniveve Pearson, David J. Sand, P. Lundqvist, L. Galbany, Jennifer E. Andrews , et al. · 2023

We present optical, infrared, ultraviolet, and radio observations of SN 2022xkq, an underluminous fast-declining type Ia supernova (SN Ia) in NGC 1784 ($\mathrm{D}\approx31$ Mpc), from $<1$ to 180 days after explosion. The high-cadence obs…

Bioenginerred Ceriumoxide Nanoparticles: Chemical, Green, Biological Methods and its Potential Applications Open

Pragya Goyal, Arpan Bhardwaj, Bhupendra Kumar Mehta, Darshana Mehta · 2023

Emblica officinalis seed coat: Extraction and their preliminaryphytochemical analysis Open

Pragya Goyal, Arpan Bhardwaj, Darshana Mehta, B.K. Mehta · 2022

Preliminary screening of phytochemicals is a valuable step, in the detection of thebioactive principles present in amla and subsequently may lead to drug discoveryand development. In the present study, chief phytoconstituents of the amla w…

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