@article{150e329af4c24fc8a192b5f4c4d2bd36,
title = "Supernova 2013by: A Type IIL supernova with a IIP-like light-curve drop",
abstract = "We present multiband ultraviolet and optical light curves, as well as visual-wavelength and near-infrared spectroscopy of the Type II linear (IIL) supernova (SN) 2013by. We show that SN 2013by and other SNe IIL in the literature, after their linear decline phase that start after maximum, have a sharp light-curve decline similar to that seen in SNe IIP. This light-curve feature has rarely been observed in other SNe IIL due to their relative rarity and the intrinsic faintness of this particular phase of the light curve. We suggest that the presence of this drop could be used as a physical parameter to distinguish between subclasses of SNe II, rather than their light-curve decline rate shortly after peak. Close inspection of the spectra of SN 2013by indicate asymmetric line profiles and signatures of high-velocity hydrogen. Late (~90 d after explosion) near-infrared spectra of SN 2013by exhibit oxygen lines, indicating significant mixing within the ejecta. From the late-time light curve, we estimate that 0.029 M⊙ of 56Ni was synthesized during the explosion. It is also shown that the V-band light-curve slope is responsible for part of the scatter in the luminosity (V magnitude 50 d after explosion) versus 56Ni relation. Our observations of SN 2013by and other SNe IIL through the onset of the nebular phase indicate that their progenitors are similar to those of SNe IIP.",
keywords = "Supernovae: general, Supernovae: individual: SN 2013by",
author = "S. Valenti and D. Sand and M. Stritzinger and Howell, {D. A.} and I. Arcavi and C. McCully and Childress, {M. J.} and Hsiao, {E. Y.} and C. Contreras and N. Morrell and Phillips, {M. M.} and M. Gromadzki and Kirshner, {R. P.} and Marion, {G. H.}",
note = "Funding Information: This material is based upon work supported by NSF under grants AST–0306969, AST–0908886, AST–0607438 and AST–1008343. MDS and the CSP gratefully acknowledge generous support provided by the Danish Agency for Science and Technology and Innovation realized through a Sapere Aude Level 2 grant. MG acknowledges support from Joined Committee ESO and Government of Chile 2014 and the Ministry for the Economy, Development and Tourisms Programa Inicativa Cientifica Milenio through grant IC 12009, awarded to The Millennium Institute of Astrophysics (MAS) and Fondecyt Regular no. 1120601. We are grateful to Rubina Kotak who provided us spectra of SN 2002hh. This paper includes data gathered with the 6.5 meter Magellan Telescopes located at LCO, Chile. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Facilities: This paper is based on observations made with the following facilities: Swift, LCOGT. Funding Information: This material is based upon work supported by NSF under grants AST-0306969, AST-0908886, AST-0607438 and AST-1008343. MDS and the CSP gratefully acknowledge generous support provided by the Danish Agency for Science and Technology and Innovation realized through a Sapere Aude Level 2 grant. MG acknowledges support from Joined Committee ESO and Government of Chile 2014 and the Ministry for the Economy, Development and Tourisms Programa Inicativa Cientifica Milenio through grant IC 12009, awarded to The Millennium Institute of Astrophysics (MAS) and Fondecyt Regular no. 1120601. We are grateful to Rubina Kotak who provided us spectra of SN 2002hh. This paper includes data gathered with the 6.5 meter Magellan Telescopes located at LCO, Chile. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Facilities: This paper is based on observations made with the following facilities: Swift, LCOGT. Publisher Copyright: {\textcopyright} 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.",
year = "2015",
month = apr,
day = "11",
doi = "10.1093/mnras/stv208",
language = "English (US)",
volume = "448",
pages = "2608--2616",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "3",
}