2018MNRAS.476.1497B -
Mon. Not. R. Astron. Soc., 476, 1497-1518 (2018/May-2)
SN 2013fs and SN 2013fr: exploring the circumstellar-material diversity in Type II supernovae.
BULLIVANT C., SMITH N., WILLIAMS G.G., MAUERHAN J.C., ANDREWS J.E., FONG W.-F., BILINSKI C., KILPATRICK C.D., MILNE P.A., FOX O.D., CENKO S.B., FILIPPENKO A.V., ZHENG W., KELLY P.L. and CLUBB K.I.
Abstract (from CDS):
We present photometry and spectroscopy of SN 2013fs and SN 2013fr in the first ∼100 d post-explosion. Both objects showed transient, relatively narrow H α emission lines characteristic of SNe IIn, but later resembled normal SNe II-P or SNe II-L, indicative of fleeting interaction with circumstellar material (CSM). SN 2013fs was discovered within 8 h of explosion; one of the earliest SNe discovered thus far. Its light curve exhibits a plateau, with spectra revealing strong CSM interaction at early times. It is a less luminous version of the transitional SN IIn PTF11iqb, further demonstrating a continuum of CSM interaction intensity between SNe II-P and SNe IIn. It requires dense CSM within 6.5 x 1014 cm of the progenitor, from a phase of advanced pre-SN mass loss beginning shortly before explosion. Spectropolarimetry of SN 2013fs shows little continuum polarization (∼0.5 per cent, consistent with zero), but noticeable line polarization during the plateau phase. SN 2013fr morphed from an SN IIn at early times to an SN II-L. After the first epoch, its narrow lines probably arose from host-galaxy emission, but the bright, narrow H α emission at early times may be intrinsic to the SN. As for SN 2013fs, this would point to a short-lived phase of strong CSM interaction if proven to be intrinsic, suggesting a continuum between SNe IIn and SNe II-L. It is a low-velocity SN II-L like SN 2009kr, but more luminous. SN 2013fr also developed an infrared excess at later times, due to warm CSM dust that requires a more sustained phase of strong pre-SN mass loss.
Abstract Copyright:
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
Journal keyword(s):
circumstellar matter - stars: mass-loss - supernovae: general - supernovae: individual: ((SN 2013fs, SN 2013fr))
Simbad objects:
31
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