space First Ever

The 'standard candles' we use to measure the size of the universe are surrounded by clouds of dust we never knew were there.

April 14, 2026

Original Paper

JWST Nebular Spectroscopy of SN 2023qov: Circumstellar Dust Emission in a Normal Type Ia Supernova

Colin W. Macrie, Conor Larison, Huei Sears, Lindsey A. Kwok, Saurabh W. Jha, Mi Dai, Joel Johansson, Stéphane Blondin, Moira Andrews, K. Auchettl, Carles Badenes, Barnabás Barna, K. Azalee Bostroem, Thomas G. Brink, Kyle W. Davis, Joseph R. Farah, Alexei V. Filippenko, Ori D. Fox, Or Graur, Saarah Hall, D. Andrew Howell, Griffin Hosseinzadeh, Anders Jerkstrand, Reka Konyves-Toth, Christopher Lidman, Keiichi Maeda, Kate Maguire, Bailey Martin, Megan Newsome, Estefania Padilla Gonzalez, Abigail Polin, Armin Rest, Zoe Rosenberg, David Sand, Michaela Schwab, Matthew Siebert, Mridweeka Singh, Támas Szalai, Tea Temim, Jacco Terwel, Brad Tucker, Jozsef Vinko, Lingzhi Wang, Xiaofeng Wang, WeiKang Zheng

arXiv · 2604.09777

The Takeaway

Type Ia supernovae are the bedrock of our cosmic distance measurements, but JWST has detected unexpected dust around a 'normal' one for the first time. This discovery means our current maps of the universe's expansion might need to be recalibrated to account for this hidden interference.

From the abstract

We present panchromatic observations of the Type Ia supernova (SN Ia) 2023qov, ranging from $\sim$2 weeks before to $\sim$1 year after maximum light. \textit{JWST} near- and mid-infrared spectra at $+$276 and $+$363~days show $\sim$400 K dust emission that cools by $\sim$75 K between epochs, the first unambiguous spectroscopic detection of dust emission in a normal SN Ia. We find that the emission is well described by models of carbonaceous dust placed within $\sim$1 light year of the SN, with a

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