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Forbidden hugs in pandemic times III. Observations of the luminous red nova AT 2021biy in the nearby galaxy NGC 4631
Cai, Y.-Z.1; Pastorello, A.2; Fraser, M.3; Wang, X.-F.1,4; Filippenko, A. V.5; Reguitti, A.2,6,7; Patra, K. C.5,8; Goranskij, V. P.9,10; Barsukova, E. A.10; Brink, T. G.5; Elias, N.2,11; Stevance, H. F.12,13; Zheng, W.5; Yang, Y.5; Atapin, K. E.9; Benetti, S.2; Boer, T. J. L. de14; Bose, S.15,16; Burke, J.17,18; Byrne, R.3; Cappellaro, E.2; Chambers, K. C.14; Chen, W.-L.21; Emami, N.21; Gao, H.14; Hiramatsu, D.17,18,19,20; Howell, D. A.17,18; Huber, M. E.14; Kankare, E.22,23; Kelly, P. L.21; Kotak, R.22; Kravtsov, T.22; Lander, V. Yu.9; Li, Z.-T.24,25; Lin, C.-C.14; Lundqvist, P.26; Magnier, E. A.14; Malygin, E. A.10; Maslennikova, N. A.9,27; Matilainen, K.22; Mazzali, P. A.28,29; McCully, C.17; Mo, J.1; Moran, S.22; Newsome, M.17,18; Oparin, D. V.10; Gonzalez, E. Padilla17,18; Reynolds, T. M.22,30; Shatsky, N. I.9; Smartt, S. J.13; Smith, K. W.13; Stritzinger, M. D.31; Tatarnikov, A. M.9,27; Terreran, G.17,18; Uklein, R. I.10; Valerin, G.2,32; Vallely, P. J.15,16; Vozyakova, O. V.9; Wainscoat, R.14; Yan, S.-Y.1; Zhang JJ(张居甲)33,34; Zhang, T.-M.24,25; Zheltoukhov, S. G.9,27; Dastidar, R.6,7; Fulton, M.13; Galbany, L.11,35; Gangopadhyay, A.36; Ge HW(葛宏伟)33,34,37; Gutiérrez, C. P.22,38; Lin, H.1; Misra, K.39; Ou, Z.-W.40; Salmaso, I.2,32; Tartaglia, L.2; Xiao, L.41,42; Zhang, X.-H.1
Contribution Rank第33完成单位
Indexed BySCI ; EI
Keywordbinaries: close stars: winds, outflows stars: individual: AT 2021biy

We present an observational study of the luminous red nova (LRN) AT 2021biy in the nearby galaxy NGC 4631. The field of the object was routinely imaged during the pre-eruptive stage by synoptic surveys, but the transient was detected only at a few epochs from similar to 231 days before maximum brightness. The LRN outburst was monitored with unprecedented cadence both photometrically and spectroscopically. AT 2021biy shows a short-duration blue peak, with a bolometric luminosity of similar to 1.6 x 10(41) erg s(-1), followed by the longest plateau among LRNe to date, with a duration of 210 days. A late-time hump in the light curve was also observed, possibly produced by a shell-shell collision. AT 2021biy exhibits the typical spectral evolution of LRNe. Early-time spectra are characterised by a blue continuum and prominent H emission lines. Then, the continuum becomes redder, resembling that of a K-type star with a forest of metal absorption lines during the plateau phase. Finally, late-time spectra show a very red continuum (T-BB approximate to 2050 K) with molecular features (e.g., TiO) resembling those of M-type stars. Spectropolarimetric analysis indicates that AT 2021biy has local dust properties similar to those of V838 Mon in the Milky Way Galaxy. Inspection of archival Hubble Space Telescope data taken on 2003 August 3 reveals a similar to 20 M-circle dot progenitor candidate with log (L/L-circle dot)= 5.0 dex and T-eff = 5900 K at solar metallicity. The above luminosity and colour match those of a luminous yellow supergiant. Most likely, this source is a close binary, with a 17-24 M(circle dot)( )primary component.

Funding ProjectN/A
Funding OrganizationN/A
Subject Area天文学 ; 恒星与银河系
MOST Discipline Catalogue理学 ; 理学::天文学
WOS IDWOS:000875299200003
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
EI Accession Number20233414616571
EI KeywordsLuminance
EI Classification Number657.2 Extraterrestrial Physics and Stellar Phenomena - 821 Agricultural Equipment and Methods ; Vegetation and Pest Control
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorCai, Y.-Z.
Affiliation1.Physics Department and Tsinghua Center for Astrophysics (THCA), Tsinghua University, Beijing 100084, PR China;
2.INAF – Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, Italy;
3.School of Physics, O’Brien Centre for Science North, University College Dublin, Belfield, Dublin 4, Ireland;
4.Beijing Planetarium, Beijing Academy of Science and Technology, Beijing 100044, PR China;
5.Department of Astronomy, University of California, Berkeley, CA 94720-3411, USA;
6.Departamento de Ciencias Fisicas, Universidad Andres Bello, Fernandez Concha 700, Las Condes, Santiago, Chile;
7.Millennium Institute of Astrophysics (MAS), Nuncio Monsenor Sòtero Sanz 100, Providencia, Santiago 8320000, Chile;
8.Nagaraj-Noll-Otelline Graduate Fellow, University of California, Berkeley, CA 94720, USA;
9.Sternberg Astronomical Institute of the Moscow State University, Moscow 119234, Russia;
10.Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnij Arkhyz 369167, Russia;
11.Institute of Space Sciences (ICE, CSIC), Campus UAB, Carrer de Can Magrans, s/n, 08193 Barcelona, Spain;
12.The Department of Physics, The University of Auckland, Private Bag 92019, Auckland, New Zealand;
13.Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University Belfast, Belfast, BT7 1NN Northern Ireland, UK;
14.Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA;
15.Department of Astronomy, The Ohio State University, 140 W. 18th Avenue, Columbus, OH 43210, USA;
16.Center for Cosmology and AstroParticle Physics (CCAPP), The Ohio State University, 191 W.Woodruff Avenue, Columbus, OH 43210, USA;
17.Las Cumbres Observatory, 6740 Cortona Dr. Suite 102, Goleta, CA 93117, USA;
18.Department of Physics, University of California, Santa Barbara, CA 93106, USA;
19.Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138-1516, USA;
20.The NSF AI Institute for Artificial Intelligence and Fundamental Interactions, Cambridge, USA;
21.School of Physics and Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455, USA;
22.Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland;
23.Turku Collegium for Science, Medicine and Technology, University of Turku, 20014 Turku, Finland;
24.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, PR China;
25.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 101408, PR China;
26.The Oskar Klein Centre, Department of Astronomy, Stockholm University, AlbaNova, 10691 Stockholm, Sweden;
27.Faculty of Physics, Moscow State University, 1 bldg. 2, Leninskie Gory, Moscow 119991, Russia;
28.Astrophysics Research Institute, Liverpool John Moores University, IC2, Liverpool Science Park, 146 Brownlow Hill, Liverpool L3 5RF, UK;
29.Max-Planck-Institut für Astrophysik, Karl-Schwarzschild Str. 1, 85741 Garching, Germany;
30.Niels Bohr Institute, University of Copenhagen, Jagtvej 128, 2200 København N, Denmark;
31.Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000 Aarhus C, Denmark;
32.Università degli Studi di Padova, Dipartimento di Fisica e Astronomia, Vicolo dell’Osservatorio 2, 35122 Padova, Italy;
33.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, PR China;
34.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, PR China;
35.Institut d’Estudis Espacials de Catalunya (IEEC), 08034 Barcelona, Spain;
36.Hiroshima Astrophysical Science Centre, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan;
37.University of Chinese Academy of Sciences, Beijing 100049, PR China;
38.Finnish Centre for Astronomy with ESO (FINCA), 20014 University of Turku, Finland;
39.Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital 263 001, India;
40.School of Physics and Astronomy, Sun Yat-sen University, Zhuhai 519082, PR China;
41.Department of Physics, College of Physical Sciences and Technology, Hebei University, Baoding 071002, PR China;
42.Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province, Hebei University, Baoding 071002, PR China
Recommended Citation
GB/T 7714
Cai, Y.-Z.,Pastorello, A.,Fraser, M.,et al. Forbidden hugs in pandemic times III. Observations of the luminous red nova AT 2021biy in the nearby galaxy NGC 4631[J]. ASTRONOMY & ASTROPHYSICS,2022,667.
APA Cai, Y.-Z..,Pastorello, A..,Fraser, M..,Wang, X.-F..,Filippenko, A. V..,...&Zhang, X.-H..(2022).Forbidden hugs in pandemic times III. Observations of the luminous red nova AT 2021biy in the nearby galaxy NGC 4631.ASTRONOMY & ASTROPHYSICS,667.
MLA Cai, Y.-Z.,et al."Forbidden hugs in pandemic times III. Observations of the luminous red nova AT 2021biy in the nearby galaxy NGC 4631".ASTRONOMY & ASTROPHYSICS 667(2022).
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