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Author Jencson, Jacob E. ♦ Kasliwal, Mansi M. ♦ Cao, Yi ♦ Johansson, Joel ♦ Contreras, Carlos ♦ Castellón, Sergio ♦ Morrell, Nidia ♦ Phillips, Mark ♦ Bond, Howard E. ♦ Monson, Andrew J. ♦ Masci, Frank J. ♦ Helou, George ♦ Cody, Ann Marie ♦ Andrews, Jennifer E. ♦ Bally, John ♦ Green, Wayne ♦ Fox, Ori D. ♦ Gburek, Timothy ♦ Gehrz, Robert D. ♦ Hsiao, Eric
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ♦ COLOR ♦ COMPARATIVE EVALUATIONS ♦ EMISSION ♦ EXPLOSIVES ♦ GALAXIES ♦ LUMINOSITY ♦ SPECTRA ♦ SPECTROSCOPY ♦ SUPERNOVAE ♦ VISIBLE RADIATION
Abstract SPitzer InfraRed Intensive Transients Survey—SPIRITS—is an ongoing survey of nearby galaxies searching for infrared (IR) transients with Spitzer /IRAC. We present the discovery and follow-up observations of one of our most luminous ( M {sub [4.5]} = −17.1 ± 0.4 mag, Vega) and reddest ([3.6] − [4.5] = 3.0 ± 0.2 mag) transients, SPIRITS 15c. The transient was detected in a dusty spiral arm of IC 2163 ( D ≈ 35.5 Mpc). Pre-discovery ground-based imaging revealed an associated, shorter-duration transient in the optical and near-IR (NIR). NIR spectroscopy showed a broad (≈8400 km s{sup −1}), double-peaked emission line of He i at 1.083 μ m, indicating an explosive origin. The NIR spectrum of SPIRITS 15c is similar to that of the Type IIb SN 2011dh at a phase of ≈200 days. Assuming an A {sub V} = 2.2 mag of extinction in SPIRITS 15c provides a good match between their optical light curves. The NIR light curves, however, show some minor discrepancies when compared with SN 2011dh, and the extreme [3.6]–[4.5] color has not been previously observed for any SN IIb. Another luminous ( M {sub 4.5} = −16.1 ± 0.4 mag) event, SPIRITS 14buu, was serendipitously discovered in the same galaxy. The source displays an optical plateau lasting ≳80 days, and we suggest a scenario similar to the low-luminosity Type IIP SN 2005cs obscured by A{sub V} ≈ 1.5 mag. Other classes of IR-luminous transients can likely be ruled out in both cases. If both events are indeed SNe, this may suggest that ≳18% of nearby core-collapse SNe are missed by currently operating optical surveys.
ISSN 0004637X
Educational Use Research
Learning Resource Type Article
Publisher Date 2017-03-10
Publisher Place United States
Journal Astrophysical Journal
Volume Number 837
Issue Number 2


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