Intermediate-luminosity red transients: Spectrophotometric properties and connection to electron-capture supernova explosions

doi:10.1051/0004-6361/202141078

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	Intermediate-luminosity red transients: Spectrophotometric properties and connection to electron-capture supernova explosions
	Cai, Y-Z 1,2,3,4; Pastorello, A.3; Fraser, M.5; Botticella, M. T.6; Elias-Rosa, N.3,7; Wang, L-Z 8,9; Kotak, R.10; Benetti, S.3; Cappellaro, E.3; Turatto, M.3
刊名	ASTRONOMY & ASTROPHYSICS
	2021-10-27
卷号	654 页码:30
关键词	supernovae: general stars: AGB and post-AGB stars: mass-loss
ISSN号	0004-6361
DOI	10.1051/0004-6361/202141078
通讯作者	Cai, Y-Z(yzcai@mail.tsinghua.edu.cn)
英文摘要	We present the spectroscopic and photometric study of five intermediate-luminosity red transients (ILRTs), namely AT 2010dn, AT 2012jc, AT 2013la, AT 2013lb, and AT 2018aes. They share common observational properties and belong to a family of objects similar to the prototypical ILRT SN 2008S. These events have a rise time that is less than 15 days and absolute peak magnitudes of between -11.5 and -14.5 mag. Their pseudo-bolometric light curves peak in the range 0.5-9.0 x 10(40) erg s(-1) and their total radiated energies are on the order of (0.3-3) x 10(47) erg. After maximum brightness, the light curves show a monotonic decline or a plateau, resembling those of faint supernovae IIL or IIP, respectively. At late phases, the light curves flatten, roughly following the slope of the Co-56 decay. If the late-time power source is indeed radioactive decay, these transients produce Ni-56 masses on the order of 10(-4) to 10(-3) M-circle dot. The spectral energy distribution of our ILRT sample, extending from the optical to the mid-infrared (MIR) domain, reveals a clear IR excess soon after explosion and non-negligible MIR emission at very late phases. The spectra show prominent H lines in emission with a typical velocity of a few hundred km s(-1), along with Ca II features. In particular, the [Ca II] lambda 7291,7324 doublet is visible at all times, which is a characteristic feature for this family of transients. The identified progenitor of SN 2008S, which is luminous in archival Spitzer MIR images, suggests an intermediate-mass precursor star embedded in a dusty cocoon. We propose the explosion of a super-asymptotic giant branch star forming an electron-capture supernova as a plausible explanation for these events.
资助项目	China Postdoctoral Science Foundation[2021M691821] ; National Natural Science Foundation of China (NSFC)[12033003] ; National Natural Science Foundation of China (NSFC)[11633002] ; National Natural Science Foundation of China (NSFC)[11325313] ; National Natural Science Foundation of China (NSFC)[11761141001] ; National Program on Key Research and Development Project[2016YFA0400803] ; NSF[AST-1911225] ; NSF[AST-1813176] ; NSF[AST-2008108] ; NSF[AST-1238877] ; NSFC[11803021] ; Startup Fund for Youngman Research at SJTU ; H2020 ERC grant[758638] ; Royal Society - Science Foundation Ireland University Research Fellowship ; PRIN-INAF 2017 of Toward ; MIUR, PRIN 2017[20179ZF5KS] ; Italian Space Agency (ASI)[2013-016-R.0] ; Spanish Ministry of Science, Innovation and Universities (MICIU)[RYC2019-027683] ; Spanish MICIU project[PID2020-115253GA-I00] ; Jenny and Antti Wihuri foundation ; Vilho, Yrjo and Kalle Vaisala foundation ; ANID BECAS/DOCTORADO NACIONAL[21202412] ; Polish NCN MAESTRO grant[2014/14/A/ST9/00121] ; Villum FONDEN[13261] ; Villum FONDEN[28021] ; Independent Research Fund Denmark[8021-00170B] ; Chinese Academy of Sciences (CAS) ; 2014-2020 ERDF Operational Programme ; Department of Economy, Knowledge, Business and University of the Regional Government of Andalusia[FEDER-UCA18-107404] ; ANID project Basal[AFB-170002] ; Magnus Ehrnrooth Foundation ; Public ESO Spectroscopic Survey for Transient Objects - PESSTO[184.D-1140] ; Public ESO Spectroscopic Survey for Transient Objects - PESSTO[188.D-3003] ; Instrument Centre for Danish Astrophysics (IDA) ; University of Copenhagen ; NOTSA ; UK Science and Technology Facilities Council ; National Aeronautics and Space Administration ; NASA[NN12AR55G] ; NASA[80NSSC18K0284] ; NASA[80NSSC18K1575] ; Kepler/K2 grant[J1944/80NSSC19K0112] ; HST[GO-15889] ; STFC[ST/T000198/1] ; STFC[ST/S006109/1] ; National Aeronautics and Space Administration[NNX08AR22G] ; Xinjiang Astronomical Observatory of the Chinese Academy of Sciences
WOS关键词	PROJECT II OBSERVATIONS ; CAII INFRARED TRIPLET ; ETA-CARINAE ; LIGHT-CURVE ; SN 2008S ; NGC 300 ; STELLAR MERGERS ; OPTICAL TRANSIENT ; NEARBY GALAXIES ; EVOLUTION
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	EDP SCIENCES S A
WOS记录号	WOS:000711651100008
资助机构	China Postdoctoral Science Foundation ; National Natural Science Foundation of China (NSFC) ; National Program on Key Research and Development Project ; NSF ; NSFC ; Startup Fund for Youngman Research at SJTU ; H2020 ERC grant ; Royal Society - Science Foundation Ireland University Research Fellowship ; PRIN-INAF 2017 of Toward ; MIUR, PRIN 2017 ; Italian Space Agency (ASI) ; Spanish Ministry of Science, Innovation and Universities (MICIU) ; Spanish MICIU project ; Jenny and Antti Wihuri foundation ; Vilho, Yrjo and Kalle Vaisala foundation ; ANID BECAS/DOCTORADO NACIONAL ; Polish NCN MAESTRO grant ; Villum FONDEN ; Independent Research Fund Denmark ; Chinese Academy of Sciences (CAS) ; 2014-2020 ERDF Operational Programme ; Department of Economy, Knowledge, Business and University of the Regional Government of Andalusia ; ANID project Basal ; Magnus Ehrnrooth Foundation ; Public ESO Spectroscopic Survey for Transient Objects - PESSTO ; Instrument Centre for Danish Astrophysics (IDA) ; University of Copenhagen ; NOTSA ; UK Science and Technology Facilities Council ; National Aeronautics and Space Administration ; NASA ; Kepler/K2 grant ; HST ; STFC ; National Aeronautics and Space Administration ; Xinjiang Astronomical Observatory of the Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/4333]
专题	研究单元未命名
通讯作者	Cai, Y-Z
作者单位	1.Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China 2.Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China 3.INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy 4.Univ Padua, Dipartimento Fis & Astron, Vicolo Osservatorio 2, I-35122 Padua, Italy 5.Univ Coll Dublin, OBrien Ctr Sci North, Sch Phys, Dublin 4, Ireland 6.INAF Osservatorio Astron Capodimonte, Salita Moiariello 16, I-80131 Naples, Italy 7.CSIC, Inst Space Sci ICE, Campus UAB,Carrer Can Magrans S-N, Barcelona 08193, Spain 8.Chinese Acad Sci, Natl Astron Observ, Chinese Acad Sci South Amer Ctr Astron, Beijing 100101, Peoples R China 9.Chinese Acad Sci, Natl Astron Observ, CAS Key Lab Opt Astron, Beijing 100101, Peoples R China 10.Univ Turku, Dept Phys & Astron, Turku 20014, Finland
推荐引用方式 GB/T 7714	Cai, Y-Z,Pastorello, A.,Fraser, M.,et al. Intermediate-luminosity red transients: Spectrophotometric properties and connection to electron-capture supernova explosions[J]. ASTRONOMY & ASTROPHYSICS,2021,654:30.
APA	Cai, Y-Z.,Pastorello, A..,Fraser, M..,Botticella, M. T..,Elias-Rosa, N..,...&Young, D. R..(2021).Intermediate-luminosity red transients: Spectrophotometric properties and connection to electron-capture supernova explosions.ASTRONOMY & ASTROPHYSICS,654,30.
MLA	Cai, Y-Z,et al."Intermediate-luminosity red transients: Spectrophotometric properties and connection to electron-capture supernova explosions".ASTRONOMY & ASTROPHYSICS 654(2021):30.