Fast and not-so-furious: case study of the fast and faint Type IIb SN 2021bxu

• Autores: Desai, Dhvanil D.; Ashall, Chris; Shappee, Benjamin J.; Morrell, Nidia Irene; Galbany, Lluís; Burns, Christopher R.; Derkacy, James M.; Hinkle, Jason T.; Hsiao, Eric; Kumar, Sahana; Lu, Jing; Phillips, Mark; Shahbandeh, Melissa; Stritzinger, Maximilian; Baron, Eddie; Bersten, Melina Cecilia; Brown, Peter J.; De Jaeger, Thomas; Elias Rosa, Nancy; Folatelli, Gaston; Huber, Mark E.; Mazzali, Paolo; Müller Bravo, Tomás E.; Piro, Anthony; Polin, Abigail; Suntzeff, Nicholas B.; Anderson, Joseph; Chambers, Kenneth C.; Chen, Ting Wan; De Boer, Thomas; Fulton, Michael D.; Gao, Hua; Gromadzki, Mariusz; Inserra, Cosimo; Magnier, Eugene A.; Nicholl, Matt; Ragosta, Fabio; Wainscoat, Richard; Young, David R.
• Año de publicación: 2023
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: STARS: MASSIVE; SUPERNOVAE: GENERAL; SUPERNOVAE: INDIVIDUAL: SN 2021BXU
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

We present photometric and spectroscopic observations and analysis of SN 2021bxu (ATLAS21dov), a low-luminosity, fast-evolving Type IIb supernova (SN). SN 2021bxu is unique, showing a large initial decline in brightness followed by a short plateau phase. With during the plateau, it is at the lower end of the luminosity distribution of stripped-envelope supernovae (SE-SNe) and shows a distinct ∼10 d plateau not caused by H- or He-recombination. SN 2021bxu shows line velocities which are at least slower than typical SE-SNe. It is photometrically and spectroscopically similar to Type IIb SNe during the photospheric phases of evolution, with similarities to Ca-rich IIb SNe. We find that the bolometric light curve is best described by a composite model of shock interaction between the ejecta and an envelope of extended material, combined with a typical SN IIb powered by the radioactive decay of 56Ni. The best-fitting parameters for SN 2021bxu include a 56Ni mass of, an ejecta mass of, and an ejecta kinetic energy of. From the fits to the properties of the extended material of Ca-rich IIb SNe we find a trend of decreasing envelope radius with increasing envelope mass. SN 2021bxu has MNi on the low end compared to SE-SNe and Ca-rich SNe in the literature, demonstrating that SN 2021bxu-like events are rare explosions in extreme areas of parameter space. The progenitor of SN 2021bxu is likely a low-mass He star with an extended envelope.
Fil: Desai, Dhvanil D.. University of Hawai‘i at Manoa; Estados Unidos
Fil: Ashall, Chris. Virginia Tech University; Estados Unidos
Fil: Shappee, Benjamin J.. University of Hawai‘i at Manoa; Estados Unidos
Fil: Morrell, Nidia Irene. Las Campanas Observatory; Chile
Fil: Galbany, Lluís. Instituto de Estudios Espaciales de Cataluña; España
Fil: Burns, Christopher R.. Carnegie Observatories; Chile
Fil: Derkacy, James M.. Virginia Tech University; Estados Unidos
Fil: Hinkle, Jason T.. University of Hawai‘i at Manoa; Estados Unidos
Fil: Hsiao, Eric. Florida State University; Estados Unidos
Fil: Kumar, Sahana. Florida State University; Estados Unidos
Fil: Lu, Jing. Florida State University; Estados Unidos
Fil: Phillips, Mark. Las Campanas Observatory; Chile
Fil: Shahbandeh, Melissa. Space Telescope Science Institute; Estados Unidos
Fil: Stritzinger, Maximilian. University Aarhus; Dinamarca
Fil: Baron, Eddie. Universitat Hamburg; Alemania. Oklahoma State University; Estados Unidos
Fil: Bersten, Melina Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Brown, Peter J.. Texas A&M University; Estados Unidos
Fil: De Jaeger, Thomas. University of Hawai‘i at Manoa; Estados Unidos
Fil: Elias Rosa, Nancy. CSIC. Instituto de Ciencias del Espacio; España
Fil: Folatelli, Gaston. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Huber, Mark E.. University of Hawai‘i at Manoa; Estados Unidos
Fil: Mazzali, Paolo. Liverpool John Moores University; Reino Unido
Fil: Müller Bravo, Tomás E.. Instituto de Estudios Espaciales de Cataluña; España
Fil: Piro, Anthony. Carnegie Observatories; Chile
Fil: Polin, Abigail. Carnegie Observatories; Chile
Fil: Suntzeff, Nicholas B.. Texas A&M University; Estados Unidos
Fil: Anderson, Joseph. European Southern Observatory Santiago; Chile. Instituto Milenio de Astrofísica; Chile
Fil: Chambers, Kenneth C.. University of Hawai‘i at Manoa; Estados Unidos
Fil: Chen, Ting Wan. Gobierno de la República Federal de Alemania. Max Planck Institut für Astrophysik; Alemania. Universitat Technical Zu Munich; Alemania
Fil: De Boer, Thomas. University of Hawai‘i at Manoa; Estados Unidos
Fil: Fulton, Michael D.. The Queens University of Belfast; Irlanda
Fil: Gao, Hua. University of Hawai‘i at Manoa; Estados Unidos
Fil: Gromadzki, Mariusz. University of Warsaw; Polonia
Fil: Inserra, Cosimo. Cardiff University; Reino Unido
Fil: Magnier, Eugene A.. University of Hawai‘i at Manoa; Estados Unidos
Fil: Nicholl, Matt. The Queens University of Belfast; Irlanda
Fil: Ragosta, Fabio. Istituto Nazionale di Astrofisica; Italia
Fil: Wainscoat, Richard. University of Hawai‘i at Manoa; Estados Unidos
Fil: Young, David R.. The Queens University of Belfast; Irlanda