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A comparison between SALT/SAAO observations and kilonova models for AT 2017gfo: the first electromagnetic counterpart of a gravitational wave transient-GW170817
Buckley, David A. H.1,2; Andreoni, Igor3,4,5; Barway, Sudhanshu1; Cooke, Jeff3,4,6; Crawford, Steven M.1,2; Gorbovskoy, Evgeny7; Gromadzki, Mariusz8; Lipunov, Vladimir7,9; Mao JR(毛基荣)10,11,12; Potter, Stephen B.1; Pretorius, Magaretha L.1,13; Pritchard, Tyler A.3; Romero-Colmenero, Encarni1,2; Shara, Michael M.14,15; Vaisanen, Petri1,2; Williams, Ted B.1
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2018-02-01
Volume474Issue:1Pages:L71-L75
DOI10.1093/mnrasl/slx196
Contribution Rank第10完成单位
Indexed BySCI
KeywordGravitational Waves Binaries: Close Gamma-ray Burst: Individual: Grb 170817a Stars: Neutron Nuclear Reactions Stars: Winds Nucleosynthesis Outflows Abundances
Abstract

We report on SALT low-resolution optical spectroscopy and optical/IR photometry undertaken with other SAAO telescopes (MASTER-SAAO and IRSF) of the kilonova AT 2017gfo (a.k.a. SSS17a) in the galaxy NGC4993 during the first 10 d of discovery. This event has been identified as the first ever electromagnetic counterpart of a gravitational wave event, namely GW170817, which was detected by the LIGO and Virgo gravitational wave observatories. The event is likely due to a merger of two neutron stars, resulting in a kilonova explosion. SALT was the third observatory to obtain spectroscopy of AT 2017gfo and the first spectrum, 1.2 d after the merger, is quite blue and shows some broad features, but no identifiable spectral lines and becomes redder by the second night. We compare the spectral and photometric evolution with recent kilonova simulations and conclude that they are in qualitative agreement for post-merger wind models with proton: nucleon ratios of Y-e = 0.25-0.30. The blue colour of the first spectrum is consistent with the lower opacity of the lanthanide-free r-process elements in the ejecta. Differences between the models and observations are likely due to the choice of system parameters combined with the absence of atomic data for more elements in the ejecta models.

Funding ProjectSouthern African Large Telescope (SALT) under the Director's Discretionary Time programme[2017-1-DDT-009] ; National Research Foundation (NRF) of South Africa ; PolishNCN grant[OPUS 2015/17/B/ST9/03167] ; Hundred Talent Program ; Chinese Academy of Sciences[KJZD-EW-M06] ; National Natural Science Foundation of China[11673062] ; Overseas Talent Program of Yunnan Province ; Australian Research Council Centre of Excellence for Gravitational Wave Discovery (OzGrav)[CE170100004] ; Australian Research Council Future fellowship[FT130101219] ; MNiSW[DIR/WK/2016/07]
Funding OrganizationSouthern African Large Telescope (SALT) under the Director's Discretionary Time programme[2017-1-DDT-009] ; National Research Foundation (NRF) of South Africa ; PolishNCN grant[OPUS 2015/17/B/ST9/03167] ; Hundred Talent Program ; Chinese Academy of Sciences[KJZD-EW-M06] ; National Natural Science Foundation of China[11673062] ; Overseas Talent Program of Yunnan Province ; Australian Research Council Centre of Excellence for Gravitational Wave Discovery (OzGrav)[CE170100004] ; Australian Research Council Future fellowship[FT130101219] ; MNiSW[DIR/WK/2016/07]
Language英语
Subject Area天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherOXFORD UNIV PRESS
Publication PlaceGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0035-8711
URL查看原文
WOS IDWOS:000425491400015
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordNEUTRON-STAR MERGERS ; R-PROCESS ; NUCLEOSYNTHESIS ; BURSTS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12289
Collection丽江天文观测站(南方基地)
中国科学院天体结构与演化重点实验室
Corresponding AuthorBuckley, David A. H.
Affiliation1.South African Astronomical Observatory, PO Box 9, Observatory 7935, Cape Town, South Africa
2.Southern African Large Telescope Foundation, PO Box 9, Observatory 7935, Cape Town, South Africa
3.Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, H29, Hawthorn, VIC 3122, Australia
4.The Australian Research Council Centre of Excellence for Gravitational Wave Discovery (OzGrav), Australia
5.Australian Astronomical Observatory, 105 Delhi Rd, North Ryde NSW 2113, Australia
6.The Australian Research Council Centre of Excellence for All-Sky Astrophysics (CAASTRO), Australia
7.M.V.Lomonosov Moscow State University, Sternberg Astronomical Institute, Universitetsky pr., 13, Moscow, 119234, Russia
8.Warsaw University Astronomical Observatory, Al. Ujazdowskie 4, PL-00-478, Warszawa, Poland
9.M.V.Lomonosov Moscow State University, Physics Department, Leninskie gory, GSP-1, Moscow, 119991, Russia
10.Yunnan Observatories, Chinese Academy of Sciences, 650011 Kunming, Yunnan Province, China
11.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, 100012 Beijing, China
12.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 650011 Kunming, China
13.Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
14.Department of Astrophysics, American Museum of Natural History, Central Park West and 79th Street, New York, NY 10024, USA
15.Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
Recommended Citation
GB/T 7714
Buckley, David A. H.,Andreoni, Igor,Barway, Sudhanshu,et al. A comparison between SALT/SAAO observations and kilonova models for AT 2017gfo: the first electromagnetic counterpart of a gravitational wave transient-GW170817[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,474(1):L71-L75.
APA Buckley, David A. H..,Andreoni, Igor.,Barway, Sudhanshu.,Cooke, Jeff.,Crawford, Steven M..,...&Williams, Ted B..(2018).A comparison between SALT/SAAO observations and kilonova models for AT 2017gfo: the first electromagnetic counterpart of a gravitational wave transient-GW170817.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,474(1),L71-L75.
MLA Buckley, David A. H.,et al."A comparison between SALT/SAAO observations and kilonova models for AT 2017gfo: the first electromagnetic counterpart of a gravitational wave transient-GW170817".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 474.1(2018):L71-L75.
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