Title | The evolution of luminous red nova AT 2017jfs in NGC 4470 |
Authors | Pastorello, A. Chen, T. -W. Cai, Y. -Z. Morales-Garoffolo, A. Cano, Z. Mason, E. Barsukova, E. A. Benetti, S. Berton, M. Bose, S. Bufano, F. Callis, E. Cannizzaro, G. Cartier, R. Chen, Ping Dong, Subo Dyrbye, S. Elias-Rosa, N. Floers, A. Fraser, M. Geier, S. Goranskij, V. P. Kann, D. A. Kuncarayakti, H. Onori, F. Reguitti, A. Reynolds, T. Losada, I. R. Carracedo, A. Sagues Schweyer, T. Smartt, S. J. Tatarnikov, A. M. Valeev, A. F. Vogl, C. Wevers, T. de Ugarte Postigo, A. Izzo, L. Inserra, C. Kankare, E. Maguire, K. Smith, K. W. Stalder, B. Tartaglia, L. Thone, C. C. Valerin, G. Young, D. R. |
Affiliation | Osserv Astron Padova, INAF, Vicolo Osservatorio 5, I-35122 Padua, Italy Max Planck Inst Extraterr Phys, Giessenbach Str 1, D-85748 Garching, Germany Univ Padua, Dipartimento Fis & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy Univ Cadiz, Dept Appl Phys, Campus Puerto Real, Cadiz 11510, Spain CSIC, IAA, Glorieta Astron S-N, E-18008 Granada, Spain Osserv Astron Trieste, INAF, Via GB Tiepolo 11, I-34143 Trieste, Italy Russian Acad Sci, Special Astrophys Observ, Nizhnii Arkhyz 369167, Karachai Cherke, Russia Univ Turku, Finnish Ctr Astron ESO FINCA, Vesilinnantie 5, Turku 20014, Finland Aalto Univ, Metsahovi Radio Observ, Metsahovintie 114, Kylmala 02540, Finland Peking Univ, Kavli Inst Astron & Astrophys, Yi He Yuan Rd 5, Beijing 100871, Peoples R China Osserv Astrofis Catania, INAF, Via Santa Sofia 78, I-95123 Catania, Italy Univ Coll Dublin, OBrien Ctr Sci North, Sch Phys, Dublin 4, Ireland SRON Netherlands Inst Space Res, SRON, Sorbonnelaan 2, NL-3584 CA Utrecht, Netherlands Radboud Univ Nijmegen, IMAPP, Dept Astrophys, POB 9010, NL-6500 GL Nijmegen, Netherlands Natl Opt Astron Observ, Cerro Tololo Interamer Observ, Casilla 603, La Serena, Chile Nord Opt Telescope, Apartado 474, Santa Cruz De Tenerife 38700, Spain CSIC, Inst Space Sci, ICE, Campus UAB,Cami Can Magrans S-N, Cerdanyola Del Valles 08193, Barcelona, Spain IEEC, C Gran Capita 2-4,Edif Nexus 201, Barcelona 08034, Spain European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85748 Garching, Germany Tech Univ Munich, Phys Dept, James Franck Str 1, D-85748 Garching, Germany Gran Telescopio Canarias GRANTECAN, Cuesta San Jose S-N, Brena Baja 38712, La Palma, Spain Inst Astrofis Canarias, Via Lactea S-N, Tenerife 38200, Spain Lomonosov Moscow Univ, Sternberg Astron Inst, Univ Sky Ave 13, Moscow 119992, Russia Univ Turku, Dept Phys & Astron, Tuorla Observ, Turku 20014, Finland Ist Astrofis Planetol Spaziali INAF, Via Fosso Cavaliere 100, I-00133 Rome, Italy Univ Andres Bello, Dept Ciencias Fis, Santiago, Chile KTH Royal Inst Technol, NORDITA, S-10691 Stockholm, Sweden Stockholm Univ, S-10691 Stockholm, Sweden Stockholm Univ, AlbaNova Univ Ctr, Dept Astron, S-10691 Stockholm, Sweden Stockholm Univ, AlbaNova, Dept Phys, Oskar Klein Ctr, S-10691 Stockholm, Sweden Queens Univ Belfast, Sch Math & Phys, Astrophys Res Ctr, Belfast BT7 1NN, Antrim, North Ireland Kazan Fed Univ, Kremlevskaya 18, Kazan 420008, Russia Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark Cardiff Univ, Sch Phys & Astron, Queens Bldg, Cardiff CF24 3AA, S Glam, Wales Trinity Coll Dublin, Sch Phys, Dublin 2, Ireland LSST, 950 North Cherry Ave, Tucson, AZ 85719 USA Stockholm Univ, Dept Astron, Oskar Klein Ctr, AlbaNova, S-10691 Stockholm, Sweden |
Keywords | binaries: close stars: massive supernovae: individual: AT 2017jfs supernovae: individual: NGC440-2011OT1 stars: winds, outflows |
Issue Date | 2019 |
Publisher | ASTRONOMY & ASTROPHYSICS |
Abstract | We present the results of our photometric and spectroscopic follow-up of the intermediate-luminosity optical transient AT 2017jfs. At peak, the object reaches an absolute magnitude of M-g = 15.46 +/- 0.15 mag and a bolometric luminosity of 5.5 x 10(41) erg s(-1). Its light curve has the double-peak shape typical of luminous red novae (LRNe), with a narrow first peak bright in the blue bands, while the second peak is longer-lasting and more luminous in the red and near-infrared (NIR) bands. During the first peak, the spectrum shows a blue continuum with narrow emission lines of H and Fe II. During the second peak, the spectrum becomes cooler, resembling that of a K-type star, and the emission lines are replaced by a forest of narrow lines in absorption. About 5 months later, while the optical light curves are characterized by a fast linear decline, the NIR ones show a moderate rebrightening, observed until the transient disappears in solar conjunction. At these late epochs, the spectrum becomes reminiscent of that of M-type stars, with prominent molecular absorption bands. The late-time properties suggest the formation of some dust in the expanding common envelope or an IR echo from foreground pre-existing dust. We propose that the object is a common-envelope transient, possibly the outcome of a merging event in a massive binary, similar to NGC4490-2011OT1. |
URI | http://hdl.handle.net/20.500.11897/548231 |
ISSN | 1432-0746 |
DOI | 10.1051/0004-6361/201935511 |
Indexed | SCI(E) EI |
Appears in Collections: | 科维理天文与天体物理研究所 |