Pith. sign in

REVIEW 5 cited by

How low can you go? SN 2018zd as a low-mass Fe core-collapse supernova

Not yet reviewed by Pith; the record is open.

Re-run · record.json Download PDF Read on arXiv ↗

This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.

SPECIMEN: schema-true, not a live event

T0 review · schema-true

One-sentence machine reading of the paper's core claim.

pith:XXXXXXXX · record.json · timestamp

arxiv 2109.12943 v1 pith:OZ6N4HZS submitted 2021-09-27 astro-ph.HE astro-ph.SR

E. Callis , M. Fraser , A. Pastorello , Subo Dong , S. J. Brennan , P. Chen , S. Bose , T. Reynolds
show 33 more authors
L. Salmon P. Jonker S. Benetti M. Berton G. Cannizzaro E. Cappellaro E. Congiu S. Dyrbye D. Eappachen N. Elias-Rosa M. Gromadzki C. P. Gutiérrez S. Holmbo T. W. S. Holoien K. Itagaki E. Kankare S. Mattila R. Mutel P. Ochner R. S. Post J. Prieto A. Reguitti T. Roth J. Ryon A. Sagués-Carracedo B. J. Shappee A. Siviero K. G. Stassun M. Stritzinger L. Tomasella S. Villanueva Jr. T. Wevers P. Wiggins
This is my paper · ORCID
classification astro-ph.HEastro-ph.SR
keywords core-collapseearliestfindlinesmassmaterialplateauprogenitor
verification ladder T0 review T1 audit T2 compute T3 formal
0 comments
abstract

We present spectroscopy and photometry of SN 2018zd, a Type IIP core-collapse supernova with signatures of interaction with circumstantial material in its earliest spectra. High ionization lines, the earmark of shock breakout, are not seen in the earliest spectral epoch, and are only seen in a single spectrum at 4.9 d after explosion. The strength and brevity of these features imply a confined circumstellar material shell in the immediate vicinity of the progenitor. Once the narrow emission lines disappear, SN 2018zd evolves similarly to a Type IIP SN, although the blue colour and enhanced plateau magnitude of SN 2018zd suggests an additional source of luminosity throughout the plateau phase. While SN 2018zd has previously been proposed as an electron-capture SN, we suggest that it is an Fe core-collapse from a low mass red supergiant progenitor. Differences in interpretation for SN 2018zd arise in part due to the large uncertainty on the distance to the host-galaxy NGC 2146, which we re-derive here to be $15.6^{+6.1}_{-3.0}$ Mpc. We find the ejected $^{56}$Ni mass for SN 2018zd to be 0.017 M$_{\odot}$, significantly higher than models of ECSNe predict. We also find the Ni/Fe ratio in SN 2018zd to be much lower that would be expected for an ECSN.

Discussion (0). Continue with ORCID to comment.

Forward citations

Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Subluminous Type IIP SN 2024abfl as a Result of a Significantly Low-energy Fe-core Collapse

    astro-ph.HE 2026-05 unverdicted novelty 6.0 of 10

    SN 2024abfl is a subluminous Type IIP event from a low-energy Fe-core collapse of a compact 9–10 M⊙ progenitor with only ~0.003 M⊙ of nickel.

  2. Real-Time Sensing of Inaccessible Physical Fields via an Edge-Deployable Hardware-Portable Graph Neural Operator

    cs.LG 2026-04 unverdicted novelty 6.0 of 10

    VIRSO maps sparse boundary observations to continuous interior fields on irregular meshes with a hardware-aligned spectral-spatial graph operator, enabling real-time edge inference under a few watts.

  3. SN 2018is: a low-luminosity Type IIP supernova with narrow hydrogen emission lines at early phases

    astro-ph.HE 2025-01 conditional novelty 5.0 of 10

    SN 2018is is a low-luminosity Type IIP supernova with a short, steep plateau and strikingly narrow hydrogen emission lines, consistent with a roughly 9 solar mass progenitor and a low-energy explosion.

  4. The Red Supergiant Progenitor of the Type II Supernova 2024abfl

    astro-ph.SR 2024-12 conditional novelty 5.0 of 10

    Using archival HST images, the authors identify a moderately reddened red supergiant at the position of SN 2024abfl and infer a 10 to 16 solar mass progenitor.

  5. Exploring the effect of mixing in Low-Luminosity Type IIp Supernovae by modeling SN 2024abfl

    astro-ph.HE 2026-07 conditional novelty 4.0 of 10

    Disabling RTI and boxcar mixing in MESA+STELLA models of a 10 M⊙ progenitor reproduces SN 2024abfl’s flat plateau and steep post-plateau drop using previously proposed mass, radius, and energy.

Pith tools