PS1-12sk is a Peculiar Supernova From a He-rich Progenitor System in a Brightest Cluster Galaxy Environment

N. E. Sanders; A. M. Soderberg; R. J. Foley; R. Chornock; D. Milisavljevic; R. Margutti; M. R. Drout; M. Moe; E. Berger; W. R. Brown; R. Lunnan; S. J. Smartt; M. Fraser; R. Kotak; L. Magill; K. W. Smith; D. Wright; K. Huang; Y. Urata; J.S.  Mulchaey; A. Rest; D. J  Sand; L. Chomiuk; A.S. Friedman; R..P.  Kirshner; G.H.  Marion; J.L. Tonry; W. S.  Burgett; K. C. Chambers; K.W.  Hodapp; R. P.   Kudritzki; P.A.  Price

doi:10.1088/0004-637X/769/1/39

PS1-12sk is a Peculiar Supernova From a He-rich Progenitor System in a Brightest Cluster Galaxy Environment

N. E. Sanders, A. M. Soderberg, R. J. Foley, R. Chornock, D. Milisavljevic, R. Margutti, M. R. Drout, M. Moe, E. Berger, W. R. Brown, R. Lunnan, S. J. Smartt, M. Fraser, R. Kotak, L. Magill, K. W. Smith, D. Wright, K. Huang, Y. Urata, J.S. MulchaeyA. Rest, D. J Sand, L. Chomiuk, A.S. Friedman, R..P. Kirshner, G.H. Marion, J.L. Tonry, W. S. Burgett, K. C. Chambers, K.W. Hodapp, R. P. Kudritzki, P.A. Price

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Abstract

We report on our discovery and observations of the Pan-STARRS1 supernova (SN) PS1-12sk, a transient with properties that indicate atypical star formation in its host galaxy cluster or pose a challenge to popular progenitor system models for this class of explosion. The optical spectra of PS1-12sk classify it as a Type Ibn SN (c.f. SN 2006jc), dominated by intermediate-width (3x10^3 km/s) and time variable He I emission. Our multi-wavelength monitoring establishes the rise time dt = 9-23 days and shows an NUV-NIR SED with temperature > 17x10^3 K and a peak rise magnitude of Mz = -18.9 mag. SN Ibn spectroscopic properties are commonly interpreted as the signature of a massive star (17 - 100 M_sun) explosion within a He-enriched circumstellar medium. However, unlike previous Type Ibn supernovae, PS1-12sk is associated with an elliptical brightest cluster galaxy, CGCG 208-042 (z = 0.054) in cluster RXC J0844.9+4258. The expected probability of an event like PS1-12sk in such environments is low given the measured infrequency of core-collapse SNe in red sequence galaxies compounded by the low volumetric rate of SN Ibn. Furthermore, we find no evidence of star formation at the explosion site to sensitive limits (Sigma Halpha

Original language	Undefined/Unknown
Journal	Astrophysical Journal
Volume	769
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/769/1/39
Publication status	Published - 02 May 2013

Bibliographical note

16 pages, 9 figures, v2 as accepted by ApJ, more information at http://www.cfa.harvard.edu/~nsanders/papers/12sk/summary.htm

Keywords

astro-ph.CO

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10.1088/0004-637X/769/1/39Licence: Unspecified

PS1-12sk IS A PECULIAR SUPERNOVA FROM A He-RICH PROGENITOR SYSTEM IN A BRIGHTEST CLUSTER GALAXY ENVIRONMENT
Copyright 2013. The American Astronomical Society. All rights reserved. This work is made available online in accordance with the publisher’s policies. Please refer to any applicable terms of use of the publisher.
Final published version, 1.35 MBLicence: Unspecified

Cite this

E. Sanders, N., M. Soderberg, A., J. Foley, R., Chornock, R., Milisavljevic, D., Margutti, R., R. Drout, M., Moe, M., Berger, E., R. Brown, W., Lunnan, R., J. Smartt, S., Fraser, M., Kotak, R., Magill, L., W. Smith, K., Wright, D., Huang, K., Urata, Y., ... Price, P. A. (2013). PS1-12sk is a Peculiar Supernova From a He-rich Progenitor System in a Brightest Cluster Galaxy Environment. Astrophysical Journal, 769(1). https://doi.org/10.1088/0004-637X/769/1/39

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abstract = "We report on our discovery and observations of the Pan-STARRS1 supernova (SN) PS1-12sk, a transient with properties that indicate atypical star formation in its host galaxy cluster or pose a challenge to popular progenitor system models for this class of explosion. The optical spectra of PS1-12sk classify it as a Type Ibn SN (c.f. SN 2006jc), dominated by intermediate-width (3x10^3 km/s) and time variable He I emission. Our multi-wavelength monitoring establishes the rise time dt = 9-23 days and shows an NUV-NIR SED with temperature > 17x10^3 K and a peak rise magnitude of Mz = -18.9 mag. SN Ibn spectroscopic properties are commonly interpreted as the signature of a massive star (17 - 100 M_sun) explosion within a He-enriched circumstellar medium. However, unlike previous Type Ibn supernovae, PS1-12sk is associated with an elliptical brightest cluster galaxy, CGCG 208-042 (z = 0.054) in cluster RXC J0844.9+4258. The expected probability of an event like PS1-12sk in such environments is low given the measured infrequency of core-collapse SNe in red sequence galaxies compounded by the low volumetric rate of SN Ibn. Furthermore, we find no evidence of star formation at the explosion site to sensitive limits (Sigma Halpha",

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author = "{E. Sanders}, N. and {M. Soderberg}, A. and {J. Foley}, R. and R. Chornock and D. Milisavljevic and R. Margutti and {R. Drout}, M. and M. Moe and E. Berger and {R. Brown}, W. and R. Lunnan and {J. Smartt}, S. and M. Fraser and R. Kotak and L. Magill and {W. Smith}, K. and D. Wright and K. Huang and Y. Urata and J.S. Mulchaey and A. Rest and Sand, {D. J} and L. Chomiuk and A.S. Friedman and R..P. Kirshner and G.H. Marion and J.L. Tonry and Burgett, {W. S.} and {C. Chambers}, K. and K.W. Hodapp and Kudritzki, {R. P.} and P.A. Price",

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E. Sanders, N, M. Soderberg, A, J. Foley, R, Chornock, R, Milisavljevic, D, Margutti, R, R. Drout, M, Moe, M, Berger, E, R. Brown, W, Lunnan, R, J. Smartt, S, Fraser, M, Kotak, R, Magill, L, W. Smith, K, Wright, D, Huang, K, Urata, Y, Mulchaey, JS, Rest, A, Sand, DJ, Chomiuk, L, Friedman, AS, Kirshner, RP, Marion, GH, Tonry, JL, Burgett, WS, C. Chambers, K, Hodapp, KW, Kudritzki, RP & Price, PA 2013, 'PS1-12sk is a Peculiar Supernova From a He-rich Progenitor System in a Brightest Cluster Galaxy Environment', Astrophysical Journal, vol. 769, no. 1. https://doi.org/10.1088/0004-637X/769/1/39

TY - JOUR

T1 - PS1-12sk is a Peculiar Supernova From a He-rich Progenitor System in a Brightest Cluster Galaxy Environment

AU - E. Sanders, N.

AU - M. Soderberg, A.

AU - J. Foley, R.

AU - Chornock, R.

AU - Milisavljevic, D.

AU - Margutti, R.

AU - R. Drout, M.

AU - Moe, M.

AU - Berger, E.

AU - R. Brown, W.

AU - Lunnan, R.

AU - J. Smartt, S.

AU - Fraser, M.

AU - Kotak, R.

AU - Magill, L.

AU - W. Smith, K.

AU - Wright, D.

AU - Huang, K.

AU - Urata, Y.

AU - Mulchaey, J.S.

AU - Rest, A.

AU - Sand, D. J

AU - Chomiuk, L.

AU - Friedman, A.S.

AU - Kirshner, R..P.

AU - Marion, G.H.

AU - Tonry, J.L.

AU - Burgett, W. S.

AU - C. Chambers, K.

AU - Hodapp, K.W.

AU - Kudritzki, R. P.

AU - Price, P.A.

N1 - 16 pages, 9 figures, v2 as accepted by ApJ, more information at http://www.cfa.harvard.edu/~nsanders/papers/12sk/summary.htm

PY - 2013/5/2

Y1 - 2013/5/2

N2 - We report on our discovery and observations of the Pan-STARRS1 supernova (SN) PS1-12sk, a transient with properties that indicate atypical star formation in its host galaxy cluster or pose a challenge to popular progenitor system models for this class of explosion. The optical spectra of PS1-12sk classify it as a Type Ibn SN (c.f. SN 2006jc), dominated by intermediate-width (3x10^3 km/s) and time variable He I emission. Our multi-wavelength monitoring establishes the rise time dt = 9-23 days and shows an NUV-NIR SED with temperature > 17x10^3 K and a peak rise magnitude of Mz = -18.9 mag. SN Ibn spectroscopic properties are commonly interpreted as the signature of a massive star (17 - 100 M_sun) explosion within a He-enriched circumstellar medium. However, unlike previous Type Ibn supernovae, PS1-12sk is associated with an elliptical brightest cluster galaxy, CGCG 208-042 (z = 0.054) in cluster RXC J0844.9+4258. The expected probability of an event like PS1-12sk in such environments is low given the measured infrequency of core-collapse SNe in red sequence galaxies compounded by the low volumetric rate of SN Ibn. Furthermore, we find no evidence of star formation at the explosion site to sensitive limits (Sigma Halpha

AB - We report on our discovery and observations of the Pan-STARRS1 supernova (SN) PS1-12sk, a transient with properties that indicate atypical star formation in its host galaxy cluster or pose a challenge to popular progenitor system models for this class of explosion. The optical spectra of PS1-12sk classify it as a Type Ibn SN (c.f. SN 2006jc), dominated by intermediate-width (3x10^3 km/s) and time variable He I emission. Our multi-wavelength monitoring establishes the rise time dt = 9-23 days and shows an NUV-NIR SED with temperature > 17x10^3 K and a peak rise magnitude of Mz = -18.9 mag. SN Ibn spectroscopic properties are commonly interpreted as the signature of a massive star (17 - 100 M_sun) explosion within a He-enriched circumstellar medium. However, unlike previous Type Ibn supernovae, PS1-12sk is associated with an elliptical brightest cluster galaxy, CGCG 208-042 (z = 0.054) in cluster RXC J0844.9+4258. The expected probability of an event like PS1-12sk in such environments is low given the measured infrequency of core-collapse SNe in red sequence galaxies compounded by the low volumetric rate of SN Ibn. Furthermore, we find no evidence of star formation at the explosion site to sensitive limits (Sigma Halpha

KW - astro-ph.CO

U2 - 10.1088/0004-637X/769/1/39

DO - 10.1088/0004-637X/769/1/39

M3 - Article

SN - 0004-637X

VL - 769

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

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