Detalles de publicación
PP 026086
SN 2021lwz: Another exotic, luminous, and fast-evolving optical stripped-envelope supernova?
1 Instituto de Astrofísica de Canarias, Vía Láctea, 38205 La Laguna, Tenerife, Spain
2 Universidad de La Laguna, Departamento de Astrofísica, 38206 La Laguna, Tenerife, Spain
3 The Oskar Klein Centre, Department of Astronomy, Stockholm University, AlbaNova, SE-10691 Stockholm, Sweden
4 Astrophysics Research Institute, Liverpool John Moores University, Liverpool Science Park IC2, 146 Brownlow Hill,
Liverpool L3 5RF, UK
5 Konkoly Observatory, CSFK, Konkoly-Thege M. út 15-17, Budapest 1121, Hungary
6 Department of Optics & Quantum Electronics, University of Szeged, Dóm tér 9, Szeged 6720, Hungary
7 ELTE Evös Loránd University, Gothard Astrophysical Observatory, 9700 Szombathely Szent Imre h. u. 112, Hungary
8 Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Northwestern University, 1800 Sherman Ave,
Evanston, IL 60201, USA
9 Graduate Institute of Astronomy, National Central University, 300 Jhongda Road, 32001 Jhongli, Taiwan
10 Finnish Centre for Astronomy with ESO (FINCA), FI-20014 University of Turku, Finland
11 Department of Physics and Astronomy, FI-20014 University of Turku, Finland
12 GRANTECAN, Cuesta de San José s/n, 38712 Breña Baja, La Palma, Spain
13 Geneva Observatory, University of Geneva, Chemin Pegasi 51, CH-1290 Versoix, Switzerland
14 Max-Planck-Institut für extraterrestrische Physik, Giessenbachstr. 1, 85748 Garching, Germany
15 Kavli Institute for Cosmology, University of Cambridge, Madingley Road, CB3 0HA Cambridge, UK
16 Institute of Astronomy, University of Cambridge, Madingley Road, CB3 0HA Cambridge, UK
17 Miller Institute for Basic Research in Science, 206B Stanley Hall, Berkeley, CA 94720, USA
18 Department of Astronomy, University of California, Berkeley, CA 94720-3411, USA
19 Caltech Optical Observatories, California Institute of Technology, Pasadena, CA 91125, USA
20 IPAC, California Institute of Technology, 1200 E. California, Blvd, Pasadena, CA 91125, USA
21 Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, CA 91125, USA
22 Cahill Center for Astrophysics, California Institute of Technology, MC 249-17, 1200 E California Boulevard, Pasadena,
CA 91125, USA
Context. Current large-scale, high-cadence surveys, such as the Zwicky Transient Facility (ZTF), provide detections of new and rare types of transients and supernovae (SNe) whose physical origins are not well understood.
Aims. We aim to investigate the nature of SN 2021lwz at a redshift z = 0.065, an over-luminous SN with an absolute magnitude of Mg∼−20.1 AB that falls in the lower range of superluminous supernovae (SLSNe) luminosities and was discovered in a faint dwarf galaxy with an absolute magnitude of Mg ≃−14.5 AB.
Methods. We studied SN 2021lwz using optical spectroscopy and photometry and by imaging linear polarimetry obtained during several follow-up campaigns. All the data were used to analyse and model the evolution of the explosion. Comparisons with other
SNe of well-known or rarer types were investigated.
Results. SN 2021lwz belongs to the rare class of rapidly evolving transients. The bolometric light curve rises in about seven days to a peak luminosity of about 5 ×1043 erg/s, at a rate of 0.2 mag day−1 close to the peak. Spectroscopy modelling reveals more similarities with a normal Type Ic-like SN than with an SLSN before peak, showing slightly broadened lines after peak. Light curve modelling shows that the Arnett model of the bolometric light curve using a radioactive source (56Ni) is not able to reasonably explain the light curve evolution. A magnetar model seems more appropriate, suggesting that the explosion of low ejecta mass (Mej∼0.24 M⊙) took place in a low-mass (M∼106.66 M⊙) dwarf galaxy of specific star formation rate about ten times larger than typical star-forming galaxies.
Conclusions. SN 2021lwz is an uncommon transient showing many similarities with several classes of transients, including rare
transients. It may be an interesting example of how differences in ejecta mass and engine parameters could produce a wide range of engine-driven stripped-envelope SNe.
Aims. We aim to investigate the nature of SN 2021lwz at a redshift z = 0.065, an over-luminous SN with an absolute magnitude of Mg∼−20.1 AB that falls in the lower range of superluminous supernovae (SLSNe) luminosities and was discovered in a faint dwarf galaxy with an absolute magnitude of Mg ≃−14.5 AB.
Methods. We studied SN 2021lwz using optical spectroscopy and photometry and by imaging linear polarimetry obtained during several follow-up campaigns. All the data were used to analyse and model the evolution of the explosion. Comparisons with other
SNe of well-known or rarer types were investigated.
Results. SN 2021lwz belongs to the rare class of rapidly evolving transients. The bolometric light curve rises in about seven days to a peak luminosity of about 5 ×1043 erg/s, at a rate of 0.2 mag day−1 close to the peak. Spectroscopy modelling reveals more similarities with a normal Type Ic-like SN than with an SLSN before peak, showing slightly broadened lines after peak. Light curve modelling shows that the Arnett model of the bolometric light curve using a radioactive source (56Ni) is not able to reasonably explain the light curve evolution. A magnetar model seems more appropriate, suggesting that the explosion of low ejecta mass (Mej∼0.24 M⊙) took place in a low-mass (M∼106.66 M⊙) dwarf galaxy of specific star formation rate about ten times larger than typical star-forming galaxies.
Conclusions. SN 2021lwz is an uncommon transient showing many similarities with several classes of transients, including rare
transients. It may be an interesting example of how differences in ejecta mass and engine parameters could produce a wide range of engine-driven stripped-envelope SNe.