JWST observations of SN 2024abup: First Detection of CO in a broad-lined Type Ic Supernova and Constraints on r-process Nucleosynthesis. Shrestha, M., Kwok, L. A., Sand, D. J., Bartmentloo, S., Christy, C., Jerkstrand, A., Bostroem, K. A., Andrews, J. E., Alexander, K. D., Dong, Y., Fields, C. E., Hoang, E., Hosseinzadeh, G., Hsu, B., Janzen, D., Jha, S. W., Johansson, J., Pearson, J., Lundquist, M. J., Mehta, D., Martas, A., Modjaz, M., Müller, B., Ransome, C. L., Ravi, A. P., Renzo, M., Retamal, N. M., Subrayan, B., Smith, N., Valenti, S., Vasylyev, S., Ricigliano, G., Brown, P. J., Andrews, M., Farah, J., Howell, D. A., McCully, C., Newsome, M., Wynn, K., Chornock, R., LeBaro, N., Margutti, R., Shahbandeh, M., Ashall, C., & Hoeflich, P. June, 2026. arXiv:2606.28561 [astro-ph.HE]
JWST observations of SN 2024abup: First Detection of CO in a broad-lined Type Ic Supernova and Constraints on r-process Nucleosynthesis [link]Paper  doi  abstract   bibtex   
SN 2024abup is a nearby broad-lined Type Ic supernova (SN Ic-bl) in NGC 0681 at a distance of 23.3 \pm 1.6 Mpc. As energetic explosions of massive stars, SNe Ic-bl are considered a plausible site for rapid-neutron capture nucleosynthesis (r-process) and chemical enrichment from short-lived progenitors. They may also contribute to dust production in the early Universe. We present JWST near- to mid-infrared (NIR+MIR) observations (1-14 micron) of SN Ic-bl 2024abup at +41 days after the V band maximum (+54 days after explosion), the first-ever JWST+MIR observation of a SN Ic-bl along with radio and optical data. Using the spectral synthesis code SUMO, we identify the observed broad IR line features in SN 2024abup and find significant contributions from C, O, Mg, and carbon monoxide (CO) – the earliest detection of molecules in a core-collapse SN so far. The spectrum shows continuum emission at wavelengths greater than 1.5 micron, which could be explained by dust – preexisting, newly formed, or a combination-heated by the SN. We do not find compelling evidence for infrared signatures of r-process elements, though our search is hampered by the presence of many broad and blended features from the non-r-process elements. These new observations indicate that SNe Ic-bl could be a contributor to early-universe dust production, and suggest that if r-process elements are produced, revealing their presence from spectra requires very high-quality data and models to disentangle blends.
@misc{shrestha_jwst_2026,
	title = {{JWST} observations of {SN} 2024abup: {First} {Detection} of {CO} in a broad-lined {Type} {Ic} {Supernova} and {Constraints} on r-process {Nucleosynthesis}},
	shorttitle = {{JWST} observations of {SN} 2024abup},
	url = {http://arxiv.org/abs/2606.28561},
	doi = {10.48550/arXiv.2606.28561},
	abstract = {SN 2024abup is a nearby broad-lined Type Ic supernova (SN Ic-bl) in NGC 0681 at a distance of 23.3 {\textbackslash}pm 1.6 Mpc. As energetic explosions of massive stars, SNe Ic-bl are considered a plausible site for rapid-neutron capture nucleosynthesis (r-process) and chemical enrichment from short-lived progenitors. They may also contribute to dust production in the early Universe. We present JWST near- to mid-infrared (NIR+MIR) observations (1-14 micron) of SN Ic-bl 2024abup at +41 days after the V band maximum (+54 days after explosion), the first-ever JWST+MIR observation of a SN Ic-bl along with radio and optical data. Using the spectral synthesis code SUMO, we identify the observed broad IR line features in SN 2024abup and find significant contributions from C, O, Mg, and carbon monoxide (CO) -- the earliest detection of molecules in a core-collapse SN so far. The spectrum shows continuum emission at wavelengths greater than 1.5 micron, which could be explained by dust -- preexisting, newly formed, or a combination-heated by the SN. We do not find compelling evidence for infrared signatures of r-process elements, though our search is hampered by the presence of many broad and blended features from the non-r-process elements. These new observations indicate that SNe Ic-bl could be a contributor to early-universe dust production, and suggest that if r-process elements are produced, revealing their presence from spectra requires very high-quality data and models to disentangle blends.},
	language = {en},
	urldate = {2026-07-07},
	publisher = {arXiv},
	author = {Shrestha, Manisha and Kwok, Lindsey A. and Sand, David J. and Bartmentloo, Stan and Christy, Collin and Jerkstrand, Anders and Bostroem, K. Azalee and Andrews, Jennifer E. and Alexander, Kate D. and Dong, Yize and Fields, Carl E. and Hoang, Emily and Hosseinzadeh, Griffin and Hsu, Brian and Janzen, Daryl and Jha, Saurabh W. and Johansson, Joel and Pearson, Jeniveve and Lundquist, M. J. and Mehta, Darshana and Martas, Aidan and Modjaz, Maryam and Müller, Bernhard and Ransome, Conor L. and Ravi, Aravind P. and Renzo, Mathieu and Retamal, Nicolás Meza and Subrayan, Bhagya and Smith, Nathan and Valenti, Stefano and Vasylyev, Sergiy and Ricigliano, Giacomo and Brown, Peter J. and Andrews, Moira and Farah, Joseph and Howell, D. Andrew and McCully, Curtis and Newsome, Megan and Wynn, Kathryn and Chornock, Ryan and LeBaro, Natalie and Margutti, Raffaella and Shahbandeh, Melissa and Ashall, Chris and Hoeflich, Peter},
	month = jun,
	year = {2026},
	note = {arXiv:2606.28561 [astro-ph.HE]},
	keywords = {Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics, WG: Explorable},
}
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