A nearby super-luminous supernova with a long pre-maximum & "plateau" and strong C II features
- Autores
- Anderson, J. P.; Pessi, Priscila Jael; Dessart, L.; Inserra, C.; Hiramatsu, D.; Taggart, K.; Smartt, S. J.; Leloudas, G.; Chen, T. W.; Möller, A.; Roy, R.; Schulze, S.; Perley, D.; Selsing, J.; Prentice, S.J.; Gal Yam, A.; Angus, C.R.; Arcavi, I.; Ashall, C.; Bulla, M.; Bray, C.; Burke, J.; Callis, E.; Cartier, R.; Chang, S.-W.; Chambers, K.; Clark, P.; Denneau, L.; Dennefeld, M.; Flewelling, H.; Fraser, M.; Galbany, L.; Gromadzki, M.; Gutiérrez, C. P.; Heinze, A.; Hosseinzadeh, G.; Howell, D.A.; Hsiao, E.Y.; Kankare, E.; Kostrzewa-Rutkowska, Z.; Magnier, E.; Maguire, K.; Mazzali, P.; McBrien, O.; McCully, C.; Morrell, Nidia Irene; Lowe, T.B.; Onken, C.A.; Onori, F.; Phillips, M.M.; Rest, A.; Ridden-Harper, R.; Ruiter, A. J.; Sand, D. J.; Smith, K.W.; Smith, M.; Stalder, B.; Stritzinger, M.D.; Sullivan, M.; Tonry, J.L.; Tucker, B.E.; Valenti, S.
- Año de publicación
- 2018
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Context. Super-luminous supernovae (SLSNe) are rare events defined as being significantly more luminous than normal terminal stellar explosions. The source of the additional power needed to achieve such luminosities is still unclear. Discoveries in the local Universe (i.e. z < 0.1) are scarce, but afford dense multi-wavelength observations. Additional low-redshift objects are therefore extremely valuable. Aims. We present early-time observations of the type I SLSN ASASSN-18km/SN 2018bsz. These data are used to characterise the event and compare to literature SLSNe and spectral models. Host galaxy properties are also analysed. Methods. Optical and near-IR photometry and spectroscopy were analysed. Early-time ATLAS photometry was used to constrain the rising light curve. We identified a number of spectral features in optical-wavelength spectra and track their time evolution. Finally, we used archival host galaxy photometry together with Hâ? II region spectra to constrain the host environment. Results. ASASSN-18km/SN 2018bsz is found to be a type I SLSN in a galaxy at a redshift of 0.0267 (111 Mpc), making it the lowest-redshift event discovered to date. Strong C II lines are identified in the spectra. Spectral models produced by exploding a Wolf-Rayet progenitor and injecting a magnetar power source are shown to be qualitatively similar to ASASSN-18km/SN 2018bsz, contrary to most SLSNe-I that display weak or non-existent C II lines. ASASSN-18km/SN 2018bsz displays a long, slowly rising, red "plateau" of >26 days, before a steeper, faster rise to maximum. The host has an absolute magnitude of -19.8 mag (r), a mass of M* = 1.5-0.33 +0.08 × 109 Mâ??, and a star formation rate of = 0.50-0.19 +2.22 Mâ?? yr-1. A nearby Hâ? II region has an oxygen abundance (O3N2) of 8.31 ± 0.01 dex.
Fil: Anderson, J. P.. European Southern Observatory Santiago; Chile
Fil: Pessi, Priscila Jael. 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: Dessart, L.. Universidad de Chile; Chile
Fil: Inserra, C.. University of Southampton; Reino Unido
Fil: Hiramatsu, D.. University of California; Estados Unidos
Fil: Taggart, K.. Liverpool John Moores University; Estados Unidos
Fil: Smartt, S. J.. The Queens University of Belfast; Irlanda
Fil: Leloudas, G.. University of Copenhagen; Dinamarca
Fil: Chen, T. W.. Max-planck-institut Für Extraterrestrische Physik; Alemania
Fil: Möller, A.. Arc Centre Of Excellence For All-sky Astrophysics (caastro); Australia. Australian National University; Australia
Fil: Roy, R.. Inter-university Centre For Astronomy And Astrophysics India; India
Fil: Schulze, S.. Weizmann Institute Of Science Israel; Israel
Fil: Perley, D.. Liverpool John Moores University; Estados Unidos
Fil: Selsing, J.. Niels Bohr Institute; Dinamarca
Fil: Prentice, S.J.. The Queens University of Belfast; Irlanda
Fil: Gal Yam, A.. Weizmann Institute Of Science Israel; Israel
Fil: Angus, C.R.. University of Southampton; Reino Unido
Fil: Arcavi, I.. University of California; Estados Unidos
Fil: Ashall, C.. Florida State University; Estados Unidos
Fil: Bulla, M.. Stockholms Universitet; Suecia
Fil: Bray, C.. Australian National University; Australia
Fil: Burke, J.. University of California; Estados Unidos
Fil: Callis, E.. University College Dublin;
Fil: Cartier, R.. Cerro Tololo Inter American Observatory; Chile
Fil: Chang, S.-W.. Arc Centre Of Excellence For All-sky Astrophysics (caastro); Australia. Australian National University; Australia
Fil: Chambers, K.. University of Hawaii at Manoa; Estados Unidos
Fil: Clark, P.. The Queens University of Belfast; Irlanda
Fil: Denneau, L.. University of Hawaii at Manoa; Estados Unidos
Fil: Dennefeld, M.. Institut D 'astrophysique de Paris; Francia
Fil: Flewelling, H.. University of Hawaii at Manoa; Estados Unidos
Fil: Fraser, M.. University College Dublin; Irlanda
Fil: Galbany, L.. University of Pittsburgh; Estados Unidos. University of Pittsburgh at Johnstown; Estados Unidos
Fil: Gromadzki, M.. Warsaw University Astronomical Observatory; Polonia
Fil: Gutiérrez, C. P.. University of Southampton; Reino Unido
Fil: Heinze, A.. University of Hawaii at Manoa; Estados Unidos
Fil: Hosseinzadeh, G.. University Of California, Santa Barbara; . Las Cumbres Observatory Global Telescope Network, Inc;
Fil: Howell, D.A.. Las Cumbres Observatory Global Telescope Network, Inc; . University Of California, Santa Barbara;
Fil: Hsiao, E.Y.. Florida State University; Estados Unidos
Fil: Kankare, E.. The Queens University of Belfast; Irlanda
Fil: Kostrzewa-Rutkowska, Z.. Radboud Universiteit Nijmegen; Países Bajos
Fil: Magnier, E.. University of Hawaii at Manoa; Estados Unidos
Fil: Maguire, K.. The Queens University of Belfast; Irlanda
Fil: Mazzali, P.. Las Campanas Observatory; Chile
Fil: McBrien, O.. The Queens University of Belfast; Irlanda
Fil: McCully, C.. University of California; Estados Unidos
Fil: Morrell, Nidia Irene. Gobierno de la República Federal de Alemania. Max Planck Institut für Astrophysik; Alemania
Fil: Lowe, T.B.. University of Hawaii at Manoa; Estados Unidos
Fil: Onken, C.A.. Australian National University; Australia
Fil: Onori, F.. Radboud Universiteit Nijmegen; Países Bajos
Fil: Phillips, M.M.. Gobierno de la República Federal de Alemania. Max Planck Institut für Astrophysik; Alemania
Fil: Rest, A.. University Johns Hopkins; Estados Unidos. Space Telescope Science Institute; Estados Unidos
Fil: Ridden-Harper, R.. Australian National University; Australia
Fil: Ruiter, A. J.. Arc Future Fellow; Australia. Australian National University, Mount Stromlo Observatory; Australia
Fil: Sand, D. J.. University of Arizona; Estados Unidos
Fil: Smith, K.W.. The Queens University of Belfast; Irlanda
Fil: Smith, M.. University of Southampton; Reino Unido
Fil: Stalder, B.. Large Synoptic Survey Telescope; Estados Unidos
Fil: Stritzinger, M.D.. University Aarhus; Dinamarca
Fil: Sullivan, M.. University of Southampton; Reino Unido
Fil: Tonry, J.L.. University of Hawaii at Manoa; Estados Unidos
Fil: Tucker, B.E.. Australian National University, Mount Stromlo Observatory; Australia
Fil: Valenti, S.. University of California; Estados Unidos - Materia
-
SUPERNOVAE: GENERAL
SUPERNOVAE: INDIVIDUAL: ASASSN-18KM
SUPERNOVAE: INDIVIDUAL: SN 2018BSZ - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
.jpg)
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/101464
Ver los metadatos del registro completo
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A nearby super-luminous supernova with a long pre-maximum & "plateau" and strong C II featuresAnderson, J. P.Pessi, Priscila JaelDessart, L.Inserra, C.Hiramatsu, D.Taggart, K.Smartt, S. J.Leloudas, G.Chen, T. W.Möller, A.Roy, R.Schulze, S.Perley, D.Selsing, J.Prentice, S.J.Gal Yam, A.Angus, C.R.Arcavi, I.Ashall, C.Bulla, M.Bray, C.Burke, J.Callis, E.Cartier, R.Chang, S.-W.Chambers, K.Clark, P.Denneau, L.Dennefeld, M.Flewelling, H.Fraser, M.Galbany, L.Gromadzki, M.Gutiérrez, C. P.Heinze, A.Hosseinzadeh, G.Howell, D.A.Hsiao, E.Y.Kankare, E.Kostrzewa-Rutkowska, Z.Magnier, E.Maguire, K.Mazzali, P.McBrien, O.McCully, C.Morrell, Nidia IreneLowe, T.B.Onken, C.A.Onori, F.Phillips, M.M.Rest, A.Ridden-Harper, R.Ruiter, A. J.Sand, D. J.Smith, K.W.Smith, M.Stalder, B.Stritzinger, M.D.Sullivan, M.Tonry, J.L.Tucker, B.E.Valenti, S.SUPERNOVAE: GENERALSUPERNOVAE: INDIVIDUAL: ASASSN-18KMSUPERNOVAE: INDIVIDUAL: SN 2018BSZhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Context. Super-luminous supernovae (SLSNe) are rare events defined as being significantly more luminous than normal terminal stellar explosions. The source of the additional power needed to achieve such luminosities is still unclear. Discoveries in the local Universe (i.e. z < 0.1) are scarce, but afford dense multi-wavelength observations. Additional low-redshift objects are therefore extremely valuable. Aims. We present early-time observations of the type I SLSN ASASSN-18km/SN 2018bsz. These data are used to characterise the event and compare to literature SLSNe and spectral models. Host galaxy properties are also analysed. Methods. Optical and near-IR photometry and spectroscopy were analysed. Early-time ATLAS photometry was used to constrain the rising light curve. We identified a number of spectral features in optical-wavelength spectra and track their time evolution. Finally, we used archival host galaxy photometry together with Hâ? II region spectra to constrain the host environment. Results. ASASSN-18km/SN 2018bsz is found to be a type I SLSN in a galaxy at a redshift of 0.0267 (111 Mpc), making it the lowest-redshift event discovered to date. Strong C II lines are identified in the spectra. Spectral models produced by exploding a Wolf-Rayet progenitor and injecting a magnetar power source are shown to be qualitatively similar to ASASSN-18km/SN 2018bsz, contrary to most SLSNe-I that display weak or non-existent C II lines. ASASSN-18km/SN 2018bsz displays a long, slowly rising, red "plateau" of >26 days, before a steeper, faster rise to maximum. The host has an absolute magnitude of -19.8 mag (r), a mass of M* = 1.5-0.33 +0.08 × 109 Mâ??, and a star formation rate of = 0.50-0.19 +2.22 Mâ?? yr-1. A nearby Hâ? II region has an oxygen abundance (O3N2) of 8.31 ± 0.01 dex.Fil: Anderson, J. P.. European Southern Observatory Santiago; ChileFil: Pessi, Priscila Jael. 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; ArgentinaFil: Dessart, L.. Universidad de Chile; ChileFil: Inserra, C.. University of Southampton; Reino UnidoFil: Hiramatsu, D.. University of California; Estados UnidosFil: Taggart, K.. Liverpool John Moores University; Estados UnidosFil: Smartt, S. J.. The Queens University of Belfast; IrlandaFil: Leloudas, G.. University of Copenhagen; DinamarcaFil: Chen, T. W.. Max-planck-institut Für Extraterrestrische Physik; AlemaniaFil: Möller, A.. Arc Centre Of Excellence For All-sky Astrophysics (caastro); Australia. Australian National University; AustraliaFil: Roy, R.. Inter-university Centre For Astronomy And Astrophysics India; IndiaFil: Schulze, S.. Weizmann Institute Of Science Israel; IsraelFil: Perley, D.. Liverpool John Moores University; Estados UnidosFil: Selsing, J.. Niels Bohr Institute; DinamarcaFil: Prentice, S.J.. The Queens University of Belfast; IrlandaFil: Gal Yam, A.. Weizmann Institute Of Science Israel; IsraelFil: Angus, C.R.. University of Southampton; Reino UnidoFil: Arcavi, I.. University of California; Estados UnidosFil: Ashall, C.. Florida State University; Estados UnidosFil: Bulla, M.. Stockholms Universitet; SueciaFil: Bray, C.. Australian National University; AustraliaFil: Burke, J.. University of California; Estados UnidosFil: Callis, E.. University College Dublin; Fil: Cartier, R.. Cerro Tololo Inter American Observatory; ChileFil: Chang, S.-W.. Arc Centre Of Excellence For All-sky Astrophysics (caastro); Australia. Australian National University; AustraliaFil: Chambers, K.. University of Hawaii at Manoa; Estados UnidosFil: Clark, P.. The Queens University of Belfast; IrlandaFil: Denneau, L.. University of Hawaii at Manoa; Estados UnidosFil: Dennefeld, M.. Institut D 'astrophysique de Paris; FranciaFil: Flewelling, H.. University of Hawaii at Manoa; Estados UnidosFil: Fraser, M.. University College Dublin; IrlandaFil: Galbany, L.. University of Pittsburgh; Estados Unidos. University of Pittsburgh at Johnstown; Estados UnidosFil: Gromadzki, M.. Warsaw University Astronomical Observatory; PoloniaFil: Gutiérrez, C. P.. University of Southampton; Reino UnidoFil: Heinze, A.. University of Hawaii at Manoa; Estados UnidosFil: Hosseinzadeh, G.. University Of California, Santa Barbara; . Las Cumbres Observatory Global Telescope Network, Inc; Fil: Howell, D.A.. Las Cumbres Observatory Global Telescope Network, Inc; . University Of California, Santa Barbara; Fil: Hsiao, E.Y.. Florida State University; Estados UnidosFil: Kankare, E.. The Queens University of Belfast; IrlandaFil: Kostrzewa-Rutkowska, Z.. Radboud Universiteit Nijmegen; Países BajosFil: Magnier, E.. University of Hawaii at Manoa; Estados UnidosFil: Maguire, K.. The Queens University of Belfast; IrlandaFil: Mazzali, P.. Las Campanas Observatory; ChileFil: McBrien, O.. The Queens University of Belfast; IrlandaFil: McCully, C.. University of California; Estados UnidosFil: Morrell, Nidia Irene. Gobierno de la República Federal de Alemania. Max Planck Institut für Astrophysik; AlemaniaFil: Lowe, T.B.. University of Hawaii at Manoa; Estados UnidosFil: Onken, C.A.. Australian National University; AustraliaFil: Onori, F.. Radboud Universiteit Nijmegen; Países BajosFil: Phillips, M.M.. Gobierno de la República Federal de Alemania. Max Planck Institut für Astrophysik; AlemaniaFil: Rest, A.. University Johns Hopkins; Estados Unidos. Space Telescope Science Institute; Estados UnidosFil: Ridden-Harper, R.. Australian National University; AustraliaFil: Ruiter, A. J.. Arc Future Fellow; Australia. Australian National University, Mount Stromlo Observatory; AustraliaFil: Sand, D. J.. University of Arizona; Estados UnidosFil: Smith, K.W.. The Queens University of Belfast; IrlandaFil: Smith, M.. University of Southampton; Reino UnidoFil: Stalder, B.. Large Synoptic Survey Telescope; Estados UnidosFil: Stritzinger, M.D.. University Aarhus; DinamarcaFil: Sullivan, M.. University of Southampton; Reino UnidoFil: Tonry, J.L.. University of Hawaii at Manoa; Estados UnidosFil: Tucker, B.E.. Australian National University, Mount Stromlo Observatory; AustraliaFil: Valenti, S.. University of California; Estados UnidosEDP Sciences2018-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/101464Anderson, J. P.; Pessi, Priscila Jael; Dessart, L.; Inserra, C.; Hiramatsu, D.; et al.; A nearby super-luminous supernova with a long pre-maximum & "plateau" and strong C II features; EDP Sciences; Astronomy and Astrophysics; 620; 12-20180004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/pdf/2018/12/aa33725-18.pdfinfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201833725info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:42:57Zoai:ri.conicet.gov.ar:11336/101464instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-22 11:42:57.458CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
| dc.title.none.fl_str_mv |
A nearby super-luminous supernova with a long pre-maximum & "plateau" and strong C II features |
| title |
A nearby super-luminous supernova with a long pre-maximum & "plateau" and strong C II features |
| spellingShingle |
A nearby super-luminous supernova with a long pre-maximum & "plateau" and strong C II features Anderson, J. P. SUPERNOVAE: GENERAL SUPERNOVAE: INDIVIDUAL: ASASSN-18KM SUPERNOVAE: INDIVIDUAL: SN 2018BSZ |
| title_short |
A nearby super-luminous supernova with a long pre-maximum & "plateau" and strong C II features |
| title_full |
A nearby super-luminous supernova with a long pre-maximum & "plateau" and strong C II features |
| title_fullStr |
A nearby super-luminous supernova with a long pre-maximum & "plateau" and strong C II features |
| title_full_unstemmed |
A nearby super-luminous supernova with a long pre-maximum & "plateau" and strong C II features |
| title_sort |
A nearby super-luminous supernova with a long pre-maximum & "plateau" and strong C II features |
| dc.creator.none.fl_str_mv |
Anderson, J. P. Pessi, Priscila Jael Dessart, L. Inserra, C. Hiramatsu, D. Taggart, K. Smartt, S. J. Leloudas, G. Chen, T. W. Möller, A. Roy, R. Schulze, S. Perley, D. Selsing, J. Prentice, S.J. Gal Yam, A. Angus, C.R. Arcavi, I. Ashall, C. Bulla, M. Bray, C. Burke, J. Callis, E. Cartier, R. Chang, S.-W. Chambers, K. Clark, P. Denneau, L. Dennefeld, M. Flewelling, H. Fraser, M. Galbany, L. Gromadzki, M. Gutiérrez, C. P. Heinze, A. Hosseinzadeh, G. Howell, D.A. Hsiao, E.Y. Kankare, E. Kostrzewa-Rutkowska, Z. Magnier, E. Maguire, K. Mazzali, P. McBrien, O. McCully, C. Morrell, Nidia Irene Lowe, T.B. Onken, C.A. Onori, F. Phillips, M.M. Rest, A. Ridden-Harper, R. Ruiter, A. J. Sand, D. J. Smith, K.W. Smith, M. Stalder, B. Stritzinger, M.D. Sullivan, M. Tonry, J.L. Tucker, B.E. Valenti, S. |
| author |
Anderson, J. P. |
| author_facet |
Anderson, J. P. Pessi, Priscila Jael Dessart, L. Inserra, C. Hiramatsu, D. Taggart, K. Smartt, S. J. Leloudas, G. Chen, T. W. Möller, A. Roy, R. Schulze, S. Perley, D. Selsing, J. Prentice, S.J. Gal Yam, A. Angus, C.R. Arcavi, I. Ashall, C. Bulla, M. Bray, C. Burke, J. Callis, E. Cartier, R. Chang, S.-W. Chambers, K. Clark, P. Denneau, L. Dennefeld, M. Flewelling, H. Fraser, M. Galbany, L. Gromadzki, M. Gutiérrez, C. P. Heinze, A. Hosseinzadeh, G. Howell, D.A. Hsiao, E.Y. Kankare, E. Kostrzewa-Rutkowska, Z. Magnier, E. Maguire, K. Mazzali, P. McBrien, O. McCully, C. Morrell, Nidia Irene Lowe, T.B. Onken, C.A. Onori, F. Phillips, M.M. Rest, A. Ridden-Harper, R. Ruiter, A. J. Sand, D. J. Smith, K.W. Smith, M. Stalder, B. Stritzinger, M.D. Sullivan, M. Tonry, J.L. Tucker, B.E. Valenti, S. |
| author_role |
author |
| author2 |
Pessi, Priscila Jael Dessart, L. Inserra, C. Hiramatsu, D. Taggart, K. Smartt, S. J. Leloudas, G. Chen, T. W. Möller, A. Roy, R. Schulze, S. Perley, D. Selsing, J. Prentice, S.J. Gal Yam, A. Angus, C.R. Arcavi, I. Ashall, C. Bulla, M. Bray, C. Burke, J. Callis, E. Cartier, R. Chang, S.-W. Chambers, K. Clark, P. Denneau, L. Dennefeld, M. Flewelling, H. Fraser, M. Galbany, L. Gromadzki, M. Gutiérrez, C. P. Heinze, A. Hosseinzadeh, G. Howell, D.A. Hsiao, E.Y. Kankare, E. Kostrzewa-Rutkowska, Z. Magnier, E. Maguire, K. Mazzali, P. McBrien, O. McCully, C. Morrell, Nidia Irene Lowe, T.B. Onken, C.A. Onori, F. Phillips, M.M. Rest, A. Ridden-Harper, R. Ruiter, A. J. Sand, D. J. Smith, K.W. Smith, M. Stalder, B. Stritzinger, M.D. Sullivan, M. Tonry, J.L. Tucker, B.E. Valenti, S. |
| author2_role |
author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author |
| dc.subject.none.fl_str_mv |
SUPERNOVAE: GENERAL SUPERNOVAE: INDIVIDUAL: ASASSN-18KM SUPERNOVAE: INDIVIDUAL: SN 2018BSZ |
| topic |
SUPERNOVAE: GENERAL SUPERNOVAE: INDIVIDUAL: ASASSN-18KM SUPERNOVAE: INDIVIDUAL: SN 2018BSZ |
| purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| dc.description.none.fl_txt_mv |
Context. Super-luminous supernovae (SLSNe) are rare events defined as being significantly more luminous than normal terminal stellar explosions. The source of the additional power needed to achieve such luminosities is still unclear. Discoveries in the local Universe (i.e. z < 0.1) are scarce, but afford dense multi-wavelength observations. Additional low-redshift objects are therefore extremely valuable. Aims. We present early-time observations of the type I SLSN ASASSN-18km/SN 2018bsz. These data are used to characterise the event and compare to literature SLSNe and spectral models. Host galaxy properties are also analysed. Methods. Optical and near-IR photometry and spectroscopy were analysed. Early-time ATLAS photometry was used to constrain the rising light curve. We identified a number of spectral features in optical-wavelength spectra and track their time evolution. Finally, we used archival host galaxy photometry together with Hâ? II region spectra to constrain the host environment. Results. ASASSN-18km/SN 2018bsz is found to be a type I SLSN in a galaxy at a redshift of 0.0267 (111 Mpc), making it the lowest-redshift event discovered to date. Strong C II lines are identified in the spectra. Spectral models produced by exploding a Wolf-Rayet progenitor and injecting a magnetar power source are shown to be qualitatively similar to ASASSN-18km/SN 2018bsz, contrary to most SLSNe-I that display weak or non-existent C II lines. ASASSN-18km/SN 2018bsz displays a long, slowly rising, red "plateau" of >26 days, before a steeper, faster rise to maximum. The host has an absolute magnitude of -19.8 mag (r), a mass of M* = 1.5-0.33 +0.08 × 109 Mâ??, and a star formation rate of = 0.50-0.19 +2.22 Mâ?? yr-1. A nearby Hâ? II region has an oxygen abundance (O3N2) of 8.31 ± 0.01 dex. Fil: Anderson, J. P.. European Southern Observatory Santiago; Chile Fil: Pessi, Priscila Jael. 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: Dessart, L.. Universidad de Chile; Chile Fil: Inserra, C.. University of Southampton; Reino Unido Fil: Hiramatsu, D.. University of California; Estados Unidos Fil: Taggart, K.. Liverpool John Moores University; Estados Unidos Fil: Smartt, S. J.. The Queens University of Belfast; Irlanda Fil: Leloudas, G.. University of Copenhagen; Dinamarca Fil: Chen, T. W.. Max-planck-institut Für Extraterrestrische Physik; Alemania Fil: Möller, A.. Arc Centre Of Excellence For All-sky Astrophysics (caastro); Australia. Australian National University; Australia Fil: Roy, R.. Inter-university Centre For Astronomy And Astrophysics India; India Fil: Schulze, S.. Weizmann Institute Of Science Israel; Israel Fil: Perley, D.. Liverpool John Moores University; Estados Unidos Fil: Selsing, J.. Niels Bohr Institute; Dinamarca Fil: Prentice, S.J.. The Queens University of Belfast; Irlanda Fil: Gal Yam, A.. Weizmann Institute Of Science Israel; Israel Fil: Angus, C.R.. University of Southampton; Reino Unido Fil: Arcavi, I.. University of California; Estados Unidos Fil: Ashall, C.. Florida State University; Estados Unidos Fil: Bulla, M.. Stockholms Universitet; Suecia Fil: Bray, C.. Australian National University; Australia Fil: Burke, J.. University of California; Estados Unidos Fil: Callis, E.. University College Dublin; Fil: Cartier, R.. Cerro Tololo Inter American Observatory; Chile Fil: Chang, S.-W.. Arc Centre Of Excellence For All-sky Astrophysics (caastro); Australia. Australian National University; Australia Fil: Chambers, K.. University of Hawaii at Manoa; Estados Unidos Fil: Clark, P.. The Queens University of Belfast; Irlanda Fil: Denneau, L.. University of Hawaii at Manoa; Estados Unidos Fil: Dennefeld, M.. Institut D 'astrophysique de Paris; Francia Fil: Flewelling, H.. University of Hawaii at Manoa; Estados Unidos Fil: Fraser, M.. University College Dublin; Irlanda Fil: Galbany, L.. University of Pittsburgh; Estados Unidos. University of Pittsburgh at Johnstown; Estados Unidos Fil: Gromadzki, M.. Warsaw University Astronomical Observatory; Polonia Fil: Gutiérrez, C. P.. University of Southampton; Reino Unido Fil: Heinze, A.. University of Hawaii at Manoa; Estados Unidos Fil: Hosseinzadeh, G.. University Of California, Santa Barbara; . Las Cumbres Observatory Global Telescope Network, Inc; Fil: Howell, D.A.. Las Cumbres Observatory Global Telescope Network, Inc; . University Of California, Santa Barbara; Fil: Hsiao, E.Y.. Florida State University; Estados Unidos Fil: Kankare, E.. The Queens University of Belfast; Irlanda Fil: Kostrzewa-Rutkowska, Z.. Radboud Universiteit Nijmegen; Países Bajos Fil: Magnier, E.. University of Hawaii at Manoa; Estados Unidos Fil: Maguire, K.. The Queens University of Belfast; Irlanda Fil: Mazzali, P.. Las Campanas Observatory; Chile Fil: McBrien, O.. The Queens University of Belfast; Irlanda Fil: McCully, C.. University of California; Estados Unidos Fil: Morrell, Nidia Irene. Gobierno de la República Federal de Alemania. Max Planck Institut für Astrophysik; Alemania Fil: Lowe, T.B.. University of Hawaii at Manoa; Estados Unidos Fil: Onken, C.A.. Australian National University; Australia Fil: Onori, F.. Radboud Universiteit Nijmegen; Países Bajos Fil: Phillips, M.M.. Gobierno de la República Federal de Alemania. Max Planck Institut für Astrophysik; Alemania Fil: Rest, A.. University Johns Hopkins; Estados Unidos. Space Telescope Science Institute; Estados Unidos Fil: Ridden-Harper, R.. Australian National University; Australia Fil: Ruiter, A. J.. Arc Future Fellow; Australia. Australian National University, Mount Stromlo Observatory; Australia Fil: Sand, D. J.. University of Arizona; Estados Unidos Fil: Smith, K.W.. The Queens University of Belfast; Irlanda Fil: Smith, M.. University of Southampton; Reino Unido Fil: Stalder, B.. Large Synoptic Survey Telescope; Estados Unidos Fil: Stritzinger, M.D.. University Aarhus; Dinamarca Fil: Sullivan, M.. University of Southampton; Reino Unido Fil: Tonry, J.L.. University of Hawaii at Manoa; Estados Unidos Fil: Tucker, B.E.. Australian National University, Mount Stromlo Observatory; Australia Fil: Valenti, S.. University of California; Estados Unidos |
| description |
Context. Super-luminous supernovae (SLSNe) are rare events defined as being significantly more luminous than normal terminal stellar explosions. The source of the additional power needed to achieve such luminosities is still unclear. Discoveries in the local Universe (i.e. z < 0.1) are scarce, but afford dense multi-wavelength observations. Additional low-redshift objects are therefore extremely valuable. Aims. We present early-time observations of the type I SLSN ASASSN-18km/SN 2018bsz. These data are used to characterise the event and compare to literature SLSNe and spectral models. Host galaxy properties are also analysed. Methods. Optical and near-IR photometry and spectroscopy were analysed. Early-time ATLAS photometry was used to constrain the rising light curve. We identified a number of spectral features in optical-wavelength spectra and track their time evolution. Finally, we used archival host galaxy photometry together with Hâ? II region spectra to constrain the host environment. Results. ASASSN-18km/SN 2018bsz is found to be a type I SLSN in a galaxy at a redshift of 0.0267 (111 Mpc), making it the lowest-redshift event discovered to date. Strong C II lines are identified in the spectra. Spectral models produced by exploding a Wolf-Rayet progenitor and injecting a magnetar power source are shown to be qualitatively similar to ASASSN-18km/SN 2018bsz, contrary to most SLSNe-I that display weak or non-existent C II lines. ASASSN-18km/SN 2018bsz displays a long, slowly rising, red "plateau" of >26 days, before a steeper, faster rise to maximum. The host has an absolute magnitude of -19.8 mag (r), a mass of M* = 1.5-0.33 +0.08 × 109 Mâ??, and a star formation rate of = 0.50-0.19 +2.22 Mâ?? yr-1. A nearby Hâ? II region has an oxygen abundance (O3N2) of 8.31 ± 0.01 dex. |
| publishDate |
2018 |
| dc.date.none.fl_str_mv |
2018-12 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
| format |
article |
| status_str |
publishedVersion |
| dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/101464 Anderson, J. P.; Pessi, Priscila Jael; Dessart, L.; Inserra, C.; Hiramatsu, D.; et al.; A nearby super-luminous supernova with a long pre-maximum & "plateau" and strong C II features; EDP Sciences; Astronomy and Astrophysics; 620; 12-2018 0004-6361 CONICET Digital CONICET |
| url |
http://hdl.handle.net/11336/101464 |
| identifier_str_mv |
Anderson, J. P.; Pessi, Priscila Jael; Dessart, L.; Inserra, C.; Hiramatsu, D.; et al.; A nearby super-luminous supernova with a long pre-maximum & "plateau" and strong C II features; EDP Sciences; Astronomy and Astrophysics; 620; 12-2018 0004-6361 CONICET Digital CONICET |
| dc.language.none.fl_str_mv |
eng |
| language |
eng |
| dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/pdf/2018/12/aa33725-18.pdf info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201833725 |
| dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
| eu_rights_str_mv |
openAccess |
| rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
| dc.format.none.fl_str_mv |
application/pdf application/pdf |
| dc.publisher.none.fl_str_mv |
EDP Sciences |
| publisher.none.fl_str_mv |
EDP Sciences |
| dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
| reponame_str |
CONICET Digital (CONICET) |
| collection |
CONICET Digital (CONICET) |
| instname_str |
Consejo Nacional de Investigaciones Científicas y Técnicas |
| repository.name.fl_str_mv |
CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
| repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
| _version_ |
1846782118582026240 |
| score |
12.982451 |