Circumstellar Medium Interaction in SN 2018lab, A Low-luminosity Type IIP Supernova Observed with TESS

Jeniveve Pearson, Griffin Hosseinzadeh, David J. Sand, Jennifer E. Andrews, Jacob E. Jencson, Yize Dong, K. Azalee Bostroem, S. Valenti, Daryl Janzen, Nicolás Meza Retamal, M. J. Lundquist, Samuel Wyatt, R. C. Amaro, Jamison Burke, D. Andrew Howell, Curtis McCully, Daichi Hiramatsu, Saurabh W. Jha, Nathan Smith, Joshua HaislipVladimir Kouprianov, Daniel E. Reichart, Yi Yang, Jeonghee Rho

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


We present photometric and spectroscopic data of SN 2018lab, a low-luminosity Type IIP supernova (LLSN) with a V-band peak luminosity of −15.1 ± 0.1 mag. SN 2018lab was discovered by the Distance Less Than 40 Mpc (DLT40) SN survey only 0.73 days post-explosion, as determined by observations from the Transiting Exoplanet Survey Satellite (TESS). TESS observations of SN 2018lab yield a densely sampled, fast-rising, early-time light curve likely powered by ejecta-circumstellar medium (CSM) interaction. The blueshifted, broadened flash feature in the earliest spectra (<2 days) of SN 2018lab provides further evidence for ejecta-CSM interaction. The early emission features in the spectra of SN 2018lab are well described by models of a red supergiant progenitor with an extended envelope and a close-in CSM. As one of the few LLSNe with observed flash features, SN 2018lab highlights the need for more early spectra to explain the diversity of the flash feature morphology of Type II SNe.

Original languageEnglish (US)
Article number107
JournalAstrophysical Journal
Issue number2
StatePublished - Mar 1 2023

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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