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|Title:||Massive stars exploding in a He-rich circumstellar medium - VIII. PSN J07285387+3349106, a highly reddened supernova Ibn||Authors:||PASTORELLO, Andrea
ELIAS DE LA ROSA, NANCY DEL CARMEN
Noebauer, U. M.
Ishida, E. E. O.
|Issue Date:||2015||Journal:||MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY||Number:||454||Issue:||4||First Page:||4293||Abstract:||We present spectroscopic and photometric observations for the Type Ibn supernova (SN) dubbed PSN J07285387+3349106. Using data provided by amateur astronomers, we monitored the photometric rise of the SN to maximum light, occurred on 2015 February 18.8 UT (JD<SUB>max</SUB>(V) = 245 7072.0 ± 0.8). PSN J07285387+3349106 exploded in the inner region of an infrared luminous galaxy, and is the most reddened SN Ibn discovered so far. We apply multiple methods to derive the total reddening to the SN, and determine a total colour excess E(B - V)<SUB>tot</SUB> = 0.99 ± 0.48 mag. Accounting for the reddening correction, which is affected by a large uncertainty, we estimate a peak absolute magnitude of M<SUB>V</SUB> = -20.30 ± 1.50. The spectra are dominated by continuum emission at early phases, and He I lines with narrow P-Cygni profiles are detected. We also identify weak Fe III and N II features. All these lines show an absorption component which is blueshifted by about 900-1000 km s<SUP>-1</SUP>. The spectra also show relatively broad He I line wings with low contrast, which extend to above 3000 km s<SUP>-1</SUP>. From about two weeks past maximum, broad lines of O I, Mg II and the Ca II near-infrared triplet are identified. The composition and the expansion velocity of the circumstellar material, and the presence of He I and α-elements in the SN ejecta indicate that PSN J07285387+3349106 was produced by the core collapse of a stripped-envelope star. We suggest that the precursor was WNE-type Wolf-Rayet star in its dense, He-rich circumstellar cocoon.||Acknowledgments:||We are grateful to Massimo Conti, Giacomo Guerrini, Paolo Rosi and Luz Marina Tinjaca Ramirez for their help with the observations. We are also grateful to Manfred Mrotzek ( http://www.astro-photos.net/index_en.htm ) and Paolo Campaner ( http://paolocampaner.blogspot.it ) for providing their observations of PSN J07285387+3349106. Part of the observations in Asiago were done during the Opticon/Neon school ( http://www.iap.fr/neon/ ), by the PhD students Demetra de Cicco (Napoli), Marco Lam (Edimburgh), Ignacio Ordovas (Santander) and Paulina Sowicka (Warsaw), under the supervision of Nancy Elias-Rosa and Michel Dennefeld. Opticon is funded by the European Commission's FP7 Capacities programme (Grant number 312430). AP, SB, NER, AH, LT, GT and MT are partially supported by the PRIN-INAF 2014 with the project ‘Transient Universe: unveiling new types of stellar explosions with PESSTO’. NER acknowledges the support from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 267251 ‘Astronomy Fellowships in Italy’ (AstroFIt). AMG acknowledges financial support by the Spanish Ministerio de Economía y Competitividad (MINECO) grant ESP2013-41268-R. ST and UMN acknowledge support by TRR33 ‘The Dark Universe’ of the German Research Foundation (DFG). EEOI is partially supported by the Brazilian agency CAPES (grant number 9229-13-2). We gratefully acknowledge the support from the Knut and Alice Wallenberg Foundation. The Oskar Klein Centre is funded by the Swedish Research Council. This paper is based on observations made with the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Fundación Galileo Galilei of the INAF (Istituto Nazionale di Astrofisica) and the Copernico Telescope of INAF-Asiago Observatory and the Rapid Eye Mount (REM) INAF telescope hosted at La-Silla (European Southern Observatory, Chile). This work is also based on observations obtained with the Nordic Optical Telescope, which is operated by the Nordic Optical Telescope Scientific Association at the Observatorio del Roque de los Muchachos, La Palma, Spain, of the Instituto de Astrofisica de Canarias. This paper is also based on observations obtained with the Joan Oró Telescope (TJO) of the Montsec Astronomical Observatory (OAdM) which is owned by the Catalan Government and operated by the Institute for Space Studies of Catalonia (IEEC). This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the NASA. We acknowledge the usage of the HyperLeda data base ( http://leda.univ-lyon1.fr ).||URI:||http://hdl.handle.net/20.500.12386/24148||URL:||https://academic.oup.com/mnras/article/454/4/4293/1000339||ISSN:||0035-8711||DOI:||10.1093/mnras/stv2256||Bibcode ADS:||2015MNRAS.454.4293P||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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