SN 2020acat: an energetic fast rising Type IIb supernova

K. Medler; P. A. Mazzali; J. Teffs; C. Ashall; J. P. Anderson; I. Arcavi; S. Benetti; K. A. Bostroem; J. Burke; Y. Z. Cai; P. Charalampopoulos; N. Elias-Rosa; M. Ergon; L. Galbany; M. Gromadzki; D. Hiramatsu; D. A. Howell; C. Inserra; P. Lundqvist; C. McCully; T. Müller -Bravo; M. Newsome; M. Nicholl; E. Padilla Gonzalez; E. Paraskeva; A. Pastorello; C. Pellegrino; P. J. Pessi; A. Reguitti; T. M. Reynolds; R. Roy; G. Terreran; L. Tomasella; D. R. Young

doi:10.1093/mnras/stac1192

SN 2020acat: an energetic fast rising Type IIb supernova

K. Medler^*, P. A. Mazzali, J. Teffs, C. Ashall, J. P. Anderson, I. Arcavi, S. Benetti, K. A. Bostroem, J. Burke, Y. Z. Cai, P. Charalampopoulos, N. Elias-Rosa, M. Ergon, L. Galbany, M. Gromadzki, D. Hiramatsu, D. A. Howell, C. Inserra, P. Lundqvist, C. McCullyT. Müller -Bravo, M. Newsome, M. Nicholl, E. Padilla Gonzalez, E. Paraskeva, A. Pastorello, C. Pellegrino, P. J. Pessi, A. Reguitti, T. M. Reynolds, R. Roy, G. Terreran, L. Tomasella, D. R. Young

^*Corresponding author for this work

Physics and Astronomy

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Abstract

The ultraviolet (UV) and near-infrared (NIR) photometric and optical spectroscopic observations of SN 2020acat covering ∼250 d after explosion are presented here. Using the fast rising photometric observations, spanning from the UV to NIR wavelengths, a pseudo-bolometric light curve was constructed and compared to several other well-observed Type IIb supernovae (SNe IIb). SN 2020acat displayed a very short rise time reaching a peak luminosity of Log10(L) = 42.49 ± 0.17 erg s-1 in only ∼14.6 ± 0.3 d. From modelling of the pseudo-bolometric light curve, we estimated a total mass of 56Ni synthesized by SN 2020acat of MNi = 0.13 ± 0.03 M⊙, with an ejecta mass of Mej = 2.3 ± 0.4 M⊙ and a kinetic energy of Ek = 1.2 ± 0.3 × 1051 erg. The optical spectra of SN 2020acat display hydrogen signatures well into the transitional period (≳ 100 d), between the photospheric and the nebular phases. The spectra also display a strong feature around 4900 Å that cannot be solely accounted for by the presence of the Fe ii 5018 line. We suggest that the Fe ii feature was augmented by He i 5016 and possibly by the presence of N ii 5005. From both photometric and spectroscopic analysis, we inferred that the progenitor of SN 2020acat was an intermediate-mass compact star with an MZAMS of 15-20 M⊙.

Original language	English
Pages (from-to)	5540-5558
Number of pages	19
Journal	Monthly Notices of the Royal Astronomical Society
Volume	513
Issue number	4
DOIs	https://doi.org/10.1093/mnras/stac1192
Publication status	Published - 5 May 2022

Bibliographical note

Publisher Copyright:
© 2022 The Author(s).

Keywords

supernovae: general
supernovae: individual: SN 2020acat

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/mnras/stac1192Licence: Creative Commons: Attribution (CC BY)

MedlerK2022energeticFinal published version, 3.36 MBLicence: Creative Commons: Attribution (CC BY)

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Medler, K., Mazzali, P. A., Teffs, J., Ashall, C., Anderson, J. P., Arcavi, I., Benetti, S., Bostroem, K. A., Burke, J., Cai, Y. Z., Charalampopoulos, P., Elias-Rosa, N., Ergon, M., Galbany, L., Gromadzki, M., Hiramatsu, D., Howell, D. A., Inserra, C., Lundqvist, P., ... Young, D. R. (2022). SN 2020acat: an energetic fast rising Type IIb supernova. Monthly Notices of the Royal Astronomical Society, 513(4), 5540-5558. https://doi.org/10.1093/mnras/stac1192

@article{122ac0b3275448729c7dc7b41c36dcaa,

title = "SN 2020acat: an energetic fast rising Type IIb supernova",

abstract = "The ultraviolet (UV) and near-infrared (NIR) photometric and optical spectroscopic observations of SN 2020acat covering ∼250 d after explosion are presented here. Using the fast rising photometric observations, spanning from the UV to NIR wavelengths, a pseudo-bolometric light curve was constructed and compared to several other well-observed Type IIb supernovae (SNe IIb). SN 2020acat displayed a very short rise time reaching a peak luminosity of Log10(L) = 42.49 ± 0.17 erg s-1 in only ∼14.6 ± 0.3 d. From modelling of the pseudo-bolometric light curve, we estimated a total mass of 56Ni synthesized by SN 2020acat of MNi = 0.13 ± 0.03 M⊙, with an ejecta mass of Mej = 2.3 ± 0.4 M⊙ and a kinetic energy of Ek = 1.2 ± 0.3 × 1051 erg. The optical spectra of SN 2020acat display hydrogen signatures well into the transitional period (≳ 100 d), between the photospheric and the nebular phases. The spectra also display a strong feature around 4900 {\AA} that cannot be solely accounted for by the presence of the Fe ii 5018 line. We suggest that the Fe ii feature was augmented by He i 5016 and possibly by the presence of N ii 5005. From both photometric and spectroscopic analysis, we inferred that the progenitor of SN 2020acat was an intermediate-mass compact star with an MZAMS of 15-20 M⊙.",

keywords = "supernovae: general, supernovae: individual: SN 2020acat",

author = "K. Medler and Mazzali, {P. A.} and J. Teffs and C. Ashall and Anderson, {J. P.} and I. Arcavi and S. Benetti and Bostroem, {K. A.} and J. Burke and Cai, {Y. Z.} and P. Charalampopoulos and N. Elias-Rosa and M. Ergon and L. Galbany and M. Gromadzki and D. Hiramatsu and Howell, {D. A.} and C. Inserra and P. Lundqvist and C. McCully and {M{\"u}ller -Bravo}, T. and M. Newsome and M. Nicholl and Gonzalez, {E. Padilla} and E. Paraskeva and A. Pastorello and C. Pellegrino and Pessi, {P. J.} and A. Reguitti and Reynolds, {T. M.} and R. Roy and G. Terreran and L. Tomasella and Young, {D. R.}",

note = "Publisher Copyright: {\textcopyright} 2022 The Author(s).",

year = "2022",

month = may,

day = "5",

doi = "10.1093/mnras/stac1192",

language = "English",

volume = "513",

pages = "5540--5558",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "SIPRI/Oxford University Press",

number = "4",

}

Medler, K, Mazzali, PA, Teffs, J, Ashall, C, Anderson, JP, Arcavi, I, Benetti, S, Bostroem, KA, Burke, J, Cai, YZ, Charalampopoulos, P, Elias-Rosa, N, Ergon, M, Galbany, L, Gromadzki, M, Hiramatsu, D, Howell, DA, Inserra, C, Lundqvist, P, McCully, C, Müller -Bravo, T, Newsome, M, Nicholl, M, Gonzalez, EP, Paraskeva, E, Pastorello, A, Pellegrino, C, Pessi, PJ, Reguitti, A, Reynolds, TM, Roy, R, Terreran, G, Tomasella, L & Young, DR 2022, 'SN 2020acat: an energetic fast rising Type IIb supernova', Monthly Notices of the Royal Astronomical Society, vol. 513, no. 4, pp. 5540-5558. https://doi.org/10.1093/mnras/stac1192

TY - JOUR

T1 - SN 2020acat

T2 - an energetic fast rising Type IIb supernova

AU - Medler, K.

AU - Mazzali, P. A.

AU - Teffs, J.

AU - Ashall, C.

AU - Anderson, J. P.

AU - Arcavi, I.

AU - Benetti, S.

AU - Bostroem, K. A.

AU - Burke, J.

AU - Cai, Y. Z.

AU - Charalampopoulos, P.

AU - Elias-Rosa, N.

AU - Ergon, M.

AU - Galbany, L.

AU - Gromadzki, M.

AU - Hiramatsu, D.

AU - Howell, D. A.

AU - Inserra, C.

AU - Lundqvist, P.

AU - McCully, C.

AU - Müller -Bravo, T.

AU - Newsome, M.

AU - Nicholl, M.

AU - Gonzalez, E. Padilla

AU - Paraskeva, E.

AU - Pastorello, A.

AU - Pellegrino, C.

AU - Pessi, P. J.

AU - Reguitti, A.

AU - Reynolds, T. M.

AU - Roy, R.

AU - Terreran, G.

AU - Tomasella, L.

AU - Young, D. R.

PY - 2022/5/5

Y1 - 2022/5/5

N2 - The ultraviolet (UV) and near-infrared (NIR) photometric and optical spectroscopic observations of SN 2020acat covering ∼250 d after explosion are presented here. Using the fast rising photometric observations, spanning from the UV to NIR wavelengths, a pseudo-bolometric light curve was constructed and compared to several other well-observed Type IIb supernovae (SNe IIb). SN 2020acat displayed a very short rise time reaching a peak luminosity of Log10(L) = 42.49 ± 0.17 erg s-1 in only ∼14.6 ± 0.3 d. From modelling of the pseudo-bolometric light curve, we estimated a total mass of 56Ni synthesized by SN 2020acat of MNi = 0.13 ± 0.03 M⊙, with an ejecta mass of Mej = 2.3 ± 0.4 M⊙ and a kinetic energy of Ek = 1.2 ± 0.3 × 1051 erg. The optical spectra of SN 2020acat display hydrogen signatures well into the transitional period (≳ 100 d), between the photospheric and the nebular phases. The spectra also display a strong feature around 4900 Å that cannot be solely accounted for by the presence of the Fe ii 5018 line. We suggest that the Fe ii feature was augmented by He i 5016 and possibly by the presence of N ii 5005. From both photometric and spectroscopic analysis, we inferred that the progenitor of SN 2020acat was an intermediate-mass compact star with an MZAMS of 15-20 M⊙.

AB - The ultraviolet (UV) and near-infrared (NIR) photometric and optical spectroscopic observations of SN 2020acat covering ∼250 d after explosion are presented here. Using the fast rising photometric observations, spanning from the UV to NIR wavelengths, a pseudo-bolometric light curve was constructed and compared to several other well-observed Type IIb supernovae (SNe IIb). SN 2020acat displayed a very short rise time reaching a peak luminosity of Log10(L) = 42.49 ± 0.17 erg s-1 in only ∼14.6 ± 0.3 d. From modelling of the pseudo-bolometric light curve, we estimated a total mass of 56Ni synthesized by SN 2020acat of MNi = 0.13 ± 0.03 M⊙, with an ejecta mass of Mej = 2.3 ± 0.4 M⊙ and a kinetic energy of Ek = 1.2 ± 0.3 × 1051 erg. The optical spectra of SN 2020acat display hydrogen signatures well into the transitional period (≳ 100 d), between the photospheric and the nebular phases. The spectra also display a strong feature around 4900 Å that cannot be solely accounted for by the presence of the Fe ii 5018 line. We suggest that the Fe ii feature was augmented by He i 5016 and possibly by the presence of N ii 5005. From both photometric and spectroscopic analysis, we inferred that the progenitor of SN 2020acat was an intermediate-mass compact star with an MZAMS of 15-20 M⊙.

KW - supernovae: general

KW - supernovae: individual: SN 2020acat

UR - http://www.scopus.com/inward/record.url?scp=85133594034&partnerID=8YFLogxK

U2 - 10.1093/mnras/stac1192

DO - 10.1093/mnras/stac1192

M3 - Article

AN - SCOPUS:85133594034

SN - 0035-8711

VL - 513

SP - 5540

EP - 5558

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

SN 2020acat: an energetic fast rising Type IIb supernova

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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