Abstract
We present photometry, spectroscopy, and host-galaxy integral-field spectroscopy of the Type II supernova (SN II) 2016esw in CGCG 229-009 from the first day after the explosion up to 120 d. Its light-curve shape is similar to that of a typical SN II; however, SN 2016esw is near the high-luminosity end of the SN II distribution, with a peak of MV max = -18.36 mag. The V-band light curve exhibits a long recombination phase for a SN II (similar to the longlived plateau of SN 2004et). Considering the well-known relation between the luminosity and the plateau decline rate, SN 2016esw should have a V-band slope of ~2.10 mag (100 d)-1; however, SN 2016esw has a substantially flatter plateau with a slope of 1.01 ± 0.26 mag (100 d)-1, perhaps indicating that interacting Type II supernovae are not useful for cosmology. At 19.5 d post-explosion, the spectrum presents a boxy H α emission line with flat absorption profiles, suggesting interaction between the ejecta and circumstellar matter. Finally, based on the spectral properties, SN 2016esw shows similarities with the luminous and interacting SN 2007pk at early epochs, particularly in terms of observable line features and their evolution.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 3776-3792 |
| Number of pages | 17 |
| Journal | Monthly Notices of the Royal Astronomical Society |
| Volume | 478 |
| Issue number | 3 |
| DOIs | |
| State | Published - Aug 1 2018 |
Funding
We thank the anonymous referee for useful suggestions that helped improve the quality of this paper. Support for AVF's supernova research group at U.C. Berkeley has been provided by U.S. NSF grant AST-1211916, the TABASGO Foundation, Gary and Cynthia Bengier (TdJ is a Bengier Postdoctoral Fellow), the Christopher R. Redlich Fund, and the Miller Institute for Basic Research in Science (U.C. Berkeley).LGwas supported in part by theNSFunder grant AST-1311862. CPG acknowledges support from EU/FP7-ERC grant no. 615929. The UCSC team is supported in part by NSF grant AST-1518052, the Gordon & Betty Moore Foundation, and from fellowships from the Alfred P. Sloan Foundation and the David and Lucile Packard Foundation to RJF. We are grateful to the following U.C. Berkeley undergraduate Nickel 1-m observers for their valuable help with this work: Nick Chocksi, Andrew Halle, Kevin Hayakawa, Andrew Rikhter, and Heechan Yuk. We thank the Lick Observatory stafffor their expert assistance. KAIT and its ongoing operation were made possible by donations from Sun Microsystems, Inc., the Hewlett-Packard Company, AutoScope Corporation, Lick Observatory, the NSF, the University of California, the Sylvia & Jim Katzman Foundation, and the TABASGO Foundation. A major upgrade of the Kast spectrograph on the Shane 3 m telescope at Lick Observatory was made possible through generous gifts from the Heising-Simons Foundation as well asWilliam and Marina Kast. Research at Lick Observatory is partially supported by a generous gift from Google. We also greatly appreciate contributions from numerous individuals, including Charles Baxter and Jinee Tao, Firmin Berta, Marc and Cristina Bensadoun, Frank and Roberta Bliss, Eliza Brown and Hal Candee, Kathy Burck and Gilbert Montoya, Alan and Jane Chew, David and Linda Cornfield, Michael Danylchuk, Jim and Hildy DeFrisco, William and Phyllis Draper, Luke Ellis and Laura Sawczuk, Jim Erbs and Shan Atkins, Alan Eustace and Kathy Kwan, David Friedberg, Harvey Glasser, Charles and Gretchen Gooding, Alan Gould and Diane Tokugawa, Thomas and Dana Grogan, Alan and Gladys Hoefer, Charles and PatriciaHunt, Adam and Rita Kablanian, Roger and Jody Lawler, Kenneth and Gloria Levy, DuBose and Nancy Montgomery, Rand Morimoto and Ana Henderson, Sunil Nagaraj and Mary Katherine Stimmler, Peter and Kristan Norvig, James and Marie O'Brient, Emilie and Doug Ogden, Paul and Sandra Otellini, Jeanne and Sanford Robertson, Stanley and Miriam Schiffman, Thomas and Alison Schneider, Ajay Shah and Lata Krishnan, Alex and Irina Shubat, the Silicon Valley Community Foundation, Mary-Lou Smulders and Nicholas Hodson, Hans Spiller, Alan and Janet Stanford, the Hugh Stuart Center Charitable Trust, Clark and Sharon Winslow, Weldon and Ruth Wood, and many others. This research was made possible in part through the use of the AAVSO Photometric All-Sky Survey (APASS), funded by the Robert Martin Ayers Sciences Fund. We thank the anonymous referee for useful suggestions that helped improve the quality of this paper. Support for AVF’s supernova research group at U.C. Berkeley has been provided by U.S. NSF grant AST-1211916, the TABASGO Foundation, Gary and Cynthia Bengier (TdJ is a Bengier Postdoctoral Fellow), the Christopher R. Redlich Fund, and the Miller Institute for Basic Research in Science (U.C. Berkeley). LG was supported in part by the NSF under grant AST-1311862. CPG acknowledges support from EU/FP7-ERC grant no. 615929. The UCSC team is supported in part by NSF grant AST–1518052, the Gordon & Betty Moore Foundation, and from fellowships from the Alfred P. Sloan Foundation and the David and Lucile Packard Foundation to RJF. We are grateful to the following U.C. Berkeley undergraduate Nickel 1-m observers for their valuable help with this work: Nick Chocksi, Andrew Halle, Kevin Hayakawa, Andrew Rikhter, and Heechan Yuk. We thank the Lick Observatory staff for their expert assistance. KAIT and its ongoing operation were made possible by donations from Sun Microsystems, Inc., the Hewlett-Packard Company, AutoScope Corporation, Lick Observatory, the NSF, the University of California, the Sylvia & Jim Katzman Foundation, and the TABASGO Foundation. A major upgrade of the Kast spectrograph on the Shane 3 m telescope at Lick Observatory was made possible through generous gifts from the Heising-Simons Foundation as well as William and Marina Kast. Research at Lick Observatory is partially supported by a generous gift from Google. We also greatly appreciate contributions from numerous individuals, including Charles Baxter and Jinee Tao, Firmin Berta, Marc and Cristina Bensadoun, Frank and Roberta Bliss, Eliza Brown and Hal Candee, Kathy Burck and Gilbert Montoya, Alan and Jane Chew, David and Linda Cornfield, Michael Danylchuk, Jim and Hildy DeFrisco, William and Phyllis Draper, Luke Ellis and Laura Sawczuk, Jim Erbs and Shan Atkins, Alan Eustace and Kathy Kwan, David Fried-berg, Harvey Glasser, Charles and Gretchen Gooding, Alan Gould and Diane Tokugawa, Thomas and Dana Grogan, Alan and Gladys Hoefer, Charles and Patricia Hunt, Adam and Rita Kablanian, Roger and Jody Lawler, Kenneth and Gloria Levy, DuBose and Nancy Montgomery, Rand Morimoto and Ana Henderson, Sunil Nagaraj and Mary Katherine Stimmler, Peter and Kristan Norvig, James and Marie O’Brient, Emilie and Doug Ogden, Paul and Sandra Otellini, Jeanne and Sanford Robertson, Stanley and Miriam Schiff-man, Thomas and Alison Schneider, Ajay Shah and Lata Krishnan, Alex and Irina Shubat, the Silicon Valley Community Foundation, Mary-Lou Smulders and Nicholas Hodson, Hans Spiller, Alan and Janet Stanford, the Hugh Stuart Center Charitable Trust, Clark and Sharon Winslow, Weldon and Ruth Wood, and many others. This research was made possible in part through the use of the AAVSO Photometric All-Sky Survey (APASS), funded by the Robert Martin Ayers Sciences Fund.
Keywords
- Supernovae: general
- Supernovae: individual: 2016esw
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science