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Title: SPIRITS: Uncovering Unusual Infrared Transients with Spitzer
Authors: Kasliwal, M. M
Bally, J
Masci, F
Cody, Ann Marie
Bond, H. E
Jencson, Jacob E
Tinyanont, S
Cao, Y
Contreras, C
Dykhoff, Devin A
Amodeo, Samuel
Armus, L
Boyer, Martha
Cantiello, Matteo
Carlon, Robert L
Cass, Alexander C
Cook, David
Corgan, David T
Faella, Joseph
Fox, O. D
Green, Wayne
Gehrz, R. D
Helou, G
Hsiao, Eric
Johansson, J
Khan, Rubab M
Lau, Ryan M
Langer, Norbert
Levesque, Emily
Milne, Peter
Mohamed, Shazrene
Morrell, N
Monson, Andy
Moore, Anna
Ofek, E. O
O' Sullivan, Donal
Parthasarathy, M
Perez, Andres
Perley, D. A
Phillips, Mark
Prince, Thomas A
Shenoy, Dinesh
Smith, Nathan
Surace, J
Van Dyk, Schuyler D
Whitelock, P. A
Williams, Robert
Keywords: Infrared: general;Novae, cataclysmic variables;Stars: AGB and post-AGB;Stars: mass-loss;Supernovae: general;Surveys
Issue Date: 20-Apr-2017
Publisher: IOP Publishing
Citation: The Astrophysical Journal, Vol. 839, No. 2, 88
Abstract: We present an ongoing, five-year systematic search for extragalactic infrared transients, dubbed SPIRITS—SPitzer InfraRed Intensive Transients Survey. In the first year, using Spitzer/IRAC, we searched 190 nearby galaxies with cadence baselines of one month and six months. We discovered over 1958 variables and 43 transients. Here, we describe the survey design and highlight 14 unusual infrared transients with no optical counterparts to deep limits, which we refer to as SPRITEs (eSPecially Red Intermediate-luminosity Transient Events). SPRITEs are in the infrared luminosity gap between novae and supernovae, with [4.5] absolute magnitudes between −11 and −14 (Vega-mag) and [3.6]–[4.5] colors between 0.3 mag and 1.6 mag. The photometric evolution of SPRITEs is diverse, ranging from <0.1 mag yr−1 to >7 mag yr−1. SPRITEs occur in star-forming galaxies. We present an in-depth study of one of them, SPIRITS 14ajc in Messier 83, which shows shock-excited molecular hydrogen emission. This shock may have been triggered by the dynamic decay of a non-hierarchical system of massive stars that led to either the formation of a binary or a protostellar merger.
Description: Restricted Access
ISSN: 0004-637X
???metadata.dc.rights???: © The American Astronomical Society
Appears in Collections:IIAP Publications

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