The Type II supernovae 2006V and 2006au: two SN~1987A-like events

F. Taddia; M. D. Stritzinger; J. Sollerman; M. M. Phillips; J. P. Anderson; M. Ergon; G. Folatelli; C. Fransson; W. Freedman; M. Hamuy; N. Morrell; A. Pastorello; S. E. Persson; Silvia Jimeno Gonzalez

doi:10.1051/0004-6361/201118091

The Type II supernovae 2006V and 2006au: two SN~1987A-like events

F. Taddia, M. D. Stritzinger, J. Sollerman, M. M. Phillips, J. P. Anderson, M. Ergon, G. Folatelli, C. Fransson, W. Freedman, M. Hamuy, N. Morrell, A. Pastorello, S. E. Persson, Silvia Jimeno Gonzalez

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32 Citations (Scopus)

Abstract

Context. Supernova 1987A revealed that a blue supergiant (BSG) star can end its life as a core-collapse supernova (SN). SN 1987A and other similar objects exhibit properties that distinguish them from ordinary Type II Plateau (IIP) SNe, whose progenitors are believed to be red supergiants (RSGs). Similarities among 1987A-like events include a long rise to maximum, early luminosity fainter than that of normal Type IIP SNe, and radioactivity acting as the primary source powering the light curves. Aims. We present and analyze two SNe monitored by the Carnegie Supernova Project that are reminiscent of SN 1987A. Methods. Optical and near-infrared (NIR) light curves, and optical spectroscopy of SNe 2006V and 2006au are presented. These observations are compared to those of SN 1987A, and are used to estimate properties of their progenitors. Results. Both objects exhibit a slow rise to maximum and light curve evolution similar to that of SN 1987A. At the earliest epochs, SN 2006au also displays an initial dip which we interpret as the signature of the adiabatic cooling phase that ensues shock break-out. SNe 2006V and 2006au are both found to be bluer, hotter and brighter than SN 1987A. Spectra of SNe 2006V and 2006au are similar to those of SN 1987A and other normal Type II objects, although both consistently exhibit expansion velocities higher than SN 1987A. Semi-analytic models are fit to the UVOIR light curve of each object from which physical properties of the progenitors are estimated. This yields ejecta mass estimates of M _ej ≈ 20 M _⊙, explosion energies of E ≈ 2-3 × 10 ⁵¹ erg s ^-1, and progenitor radii of R ≈ 75-100 R _⊙ for both SNe. Conclusions. The progenitors of SNe 2006V and 2006au were most likely BSGs with a larger explosion energy as compared to that of SN 1987A.

Original language	English
Article number	A140
Journal	Astronomy & Astrophysics
Volume	537
Pages (from-to)	1-21
Number of pages	1
ISSN	0365-0138
DOIs	https://doi.org/10.1051/0004-6361/201118091
Publication status	Published - 2012

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Taddia, F., Stritzinger, M. D., Sollerman, J., Phillips, M. M., Anderson, J. P., Ergon, M., Folatelli, G., Fransson, C., Freedman, W., Hamuy, M., Morrell, N., Pastorello, A., Persson, S. E., & Gonzalez, S. J. (2012). The Type II supernovae 2006V and 2006au: two SN~1987A-like events. Astronomy & Astrophysics, 537, 1-21. [A140]. https://doi.org/10.1051/0004-6361/201118091

@article{ee400ab2a4da41be82a0165c1e6e33ee,

title = "The Type II supernovae 2006V and 2006au: two SN~1987A-like events",

abstract = "Context. Supernova 1987A revealed that a blue supergiant (BSG) star can end its life as a core-collapse supernova (SN). SN 1987A and other similar objects exhibit properties that distinguish them from ordinary Type II Plateau (IIP) SNe, whose progenitors are believed to be red supergiants (RSGs). Similarities among 1987A-like events include a long rise to maximum, early luminosity fainter than that of normal Type IIP SNe, and radioactivity acting as the primary source powering the light curves. Aims. We present and analyze two SNe monitored by the Carnegie Supernova Project that are reminiscent of SN 1987A. Methods. Optical and near-infrared (NIR) light curves, and optical spectroscopy of SNe 2006V and 2006au are presented. These observations are compared to those of SN 1987A, and are used to estimate properties of their progenitors. Results. Both objects exhibit a slow rise to maximum and light curve evolution similar to that of SN 1987A. At the earliest epochs, SN 2006au also displays an initial dip which we interpret as the signature of the adiabatic cooling phase that ensues shock break-out. SNe 2006V and 2006au are both found to be bluer, hotter and brighter than SN 1987A. Spectra of SNe 2006V and 2006au are similar to those of SN 1987A and other normal Type II objects, although both consistently exhibit expansion velocities higher than SN 1987A. Semi-analytic models are fit to the UVOIR light curve of each object from which physical properties of the progenitors are estimated. This yields ejecta mass estimates of M ej ≈ 20 M ⊙, explosion energies of E ≈ 2-3 × 10 51 erg s -1, and progenitor radii of R ≈ 75-100 R ⊙ for both SNe. Conclusions. The progenitors of SNe 2006V and 2006au were most likely BSGs with a larger explosion energy as compared to that of SN 1987A.",

author = "F. Taddia and Stritzinger, {M. D.} and J. Sollerman and Phillips, {M. M.} and Anderson, {J. P.} and M. Ergon and G. Folatelli and C. Fransson and W. Freedman and M. Hamuy and N. Morrell and A. Pastorello and Persson, {S. E.} and Gonzalez, {Silvia Jimeno}",

year = "2012",

doi = "10.1051/0004-6361/201118091",

language = "English",

volume = "537",

pages = "1--21",

journal = "Astronomy and Astrophysics Supplement Series",

issn = "0004-6361",

publisher = "E D P Sciences",

}

TY - JOUR

T1 - The Type II supernovae 2006V and 2006au

T2 - two SN~1987A-like events

AU - Taddia, F.

AU - Stritzinger, M. D.

AU - Sollerman, J.

AU - Phillips, M. M.

AU - Anderson, J. P.

AU - Ergon, M.

AU - Folatelli, G.

AU - Fransson, C.

AU - Freedman, W.

AU - Hamuy, M.

AU - Morrell, N.

AU - Pastorello, A.

AU - Persson, S. E.

AU - Gonzalez, Silvia Jimeno

PY - 2012

Y1 - 2012

N2 - Context. Supernova 1987A revealed that a blue supergiant (BSG) star can end its life as a core-collapse supernova (SN). SN 1987A and other similar objects exhibit properties that distinguish them from ordinary Type II Plateau (IIP) SNe, whose progenitors are believed to be red supergiants (RSGs). Similarities among 1987A-like events include a long rise to maximum, early luminosity fainter than that of normal Type IIP SNe, and radioactivity acting as the primary source powering the light curves. Aims. We present and analyze two SNe monitored by the Carnegie Supernova Project that are reminiscent of SN 1987A. Methods. Optical and near-infrared (NIR) light curves, and optical spectroscopy of SNe 2006V and 2006au are presented. These observations are compared to those of SN 1987A, and are used to estimate properties of their progenitors. Results. Both objects exhibit a slow rise to maximum and light curve evolution similar to that of SN 1987A. At the earliest epochs, SN 2006au also displays an initial dip which we interpret as the signature of the adiabatic cooling phase that ensues shock break-out. SNe 2006V and 2006au are both found to be bluer, hotter and brighter than SN 1987A. Spectra of SNe 2006V and 2006au are similar to those of SN 1987A and other normal Type II objects, although both consistently exhibit expansion velocities higher than SN 1987A. Semi-analytic models are fit to the UVOIR light curve of each object from which physical properties of the progenitors are estimated. This yields ejecta mass estimates of M ej ≈ 20 M ⊙, explosion energies of E ≈ 2-3 × 10 51 erg s -1, and progenitor radii of R ≈ 75-100 R ⊙ for both SNe. Conclusions. The progenitors of SNe 2006V and 2006au were most likely BSGs with a larger explosion energy as compared to that of SN 1987A.

AB - Context. Supernova 1987A revealed that a blue supergiant (BSG) star can end its life as a core-collapse supernova (SN). SN 1987A and other similar objects exhibit properties that distinguish them from ordinary Type II Plateau (IIP) SNe, whose progenitors are believed to be red supergiants (RSGs). Similarities among 1987A-like events include a long rise to maximum, early luminosity fainter than that of normal Type IIP SNe, and radioactivity acting as the primary source powering the light curves. Aims. We present and analyze two SNe monitored by the Carnegie Supernova Project that are reminiscent of SN 1987A. Methods. Optical and near-infrared (NIR) light curves, and optical spectroscopy of SNe 2006V and 2006au are presented. These observations are compared to those of SN 1987A, and are used to estimate properties of their progenitors. Results. Both objects exhibit a slow rise to maximum and light curve evolution similar to that of SN 1987A. At the earliest epochs, SN 2006au also displays an initial dip which we interpret as the signature of the adiabatic cooling phase that ensues shock break-out. SNe 2006V and 2006au are both found to be bluer, hotter and brighter than SN 1987A. Spectra of SNe 2006V and 2006au are similar to those of SN 1987A and other normal Type II objects, although both consistently exhibit expansion velocities higher than SN 1987A. Semi-analytic models are fit to the UVOIR light curve of each object from which physical properties of the progenitors are estimated. This yields ejecta mass estimates of M ej ≈ 20 M ⊙, explosion energies of E ≈ 2-3 × 10 51 erg s -1, and progenitor radii of R ≈ 75-100 R ⊙ for both SNe. Conclusions. The progenitors of SNe 2006V and 2006au were most likely BSGs with a larger explosion energy as compared to that of SN 1987A.

U2 - 10.1051/0004-6361/201118091

DO - 10.1051/0004-6361/201118091

M3 - Journal article

SN - 0004-6361

VL - 537

SP - 1

EP - 21

JO - Astronomy and Astrophysics Supplement Series

JF - Astronomy and Astrophysics Supplement Series

M1 - A140

ER -

The Type II supernovae 2006V and 2006au: two SN~1987A-like events

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