中国科学院机构知识库网格系统: AT 2025abao: The fourth luminous red nova in M 31

AT 2025abao: The fourth luminous red nova in M 31

文献类型：期刊论文


作者	Reguitti, A.1,2; Pastorello, A.1; Valerin, G.1; Romanov, F. D.3; Siviero, A.1,4; Cai YZ(蔡永志)1,5,6; Ciroi, S.4; Elias, N.1,7; Iijima, T.1; Kankare, E.8
刊名	ASTRONOMY & ASTROPHYSICS
出版日期	2026-04-30
卷号	709
关键词	techniques: photometric techniques: spectroscopic stars: AGB and post-AGB binaries: general supernovae: individual: AT 2025abao galaxies: individual: M 31
ISSN号	0004-6361
DOI	10.1051/0004-6361/202659456
产权排序	第5完成单位
文献子类	Article
英文摘要	We present photometric and spectroscopic observations of the luminous red nova (LRN) AT 2025abao, the fourth discovered in M 31. The LRN, associated with the asymptotic giant branch (AGB) star WNTR23bzdiq, was discovered during the fast rise following the minimum phase. It reached its peak at g = 15.1 mag (M-g = -9.5 +/- 0.1 mag), and then it settled onto a long-duration plateau in the red bands, lasting 70 days, while it was slowly linearly declining in the blue bands. At the peak the object showed similarities with the canonical LRNe V838 Monocerotis, V1309 Scorpii, and the faint and fast-evolving AT 2019zhd, which is the third LRN in M31, though the later evolution is different. Spectroscopically, AT 2025abao evolved as a canonical LRN: the early spectra present a blue continuum with narrow Balmer lines in emission; at the peak, the spectral continuum had cooled to a yellow colour, with a photospheric temperature of 6000 K. Balmer lines had weakened, while absorption lines from metals (Fe I, Fe II, Sc II, Ba II, Ti II) had developed, and they were particularly broad from the UV Ca II H&K lines. Medium- and high-resolution spectra reveal narrow (similar to 50 km s(-1)) absorption and broad (similar to 450 km s(-1)) emission profiles in the Balmer lines, from a slower wind and a faster outflow, respectively. Finally, late-time spectra show an orange continuum (T similar to 4000 - 5000 K), a return in strength of the Balmer lines and the formation of molecular absorption bands. AT 2025abao is the rare case of an LRN with detailed archival information regarding the progenitor system. For the first time, we obtained the spectral energy distribution in the infrared of the precursor of an LRN, which is consistent with that of an M giant/AGB. We propose that the dichotomy of light-curve behaviour in LRNe (two peaks vs. plateau) can be explained by the extent and H-richness of the common envelope.
学科主题	天文学 ; 恒星与银河系
URL标识	查看原文
出版地	17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
WOS关键词	COMMON ENVELOPE EVOLUTION ; DYNAMICAL MASS-LOSS ; STELLAR MERGERS ; V838 MONOCEROTIS ; V4332 SAGITTARII ; FORBIDDEN HUGS ; LIGHT-CURVE ; OUTBURST ; TRANSIENTS ; GALAXY
资助项目	PRIN-INAF[2022]; Spanish Ministerio de Ciencia e Innovacin; Program Unidad de Excelencia Maria de Maeztu[CEX2020-001058-M]; Research Council of Finland[350458]; Danish National Research Foundation[DNRF140]; Independent Research Fund Denmark[10.46540/2032-00022B]; National Natural Science Foundation of China[12303054]; National Key Research and Development Program of China[2024YFA1611603]; Yunnan Fundamental Research Projects[202501AS070078]; International Centre of Supernovae, Yunnan Key Laboratory[202302AN360001]; Schmidt telescopes (Asiago Ekar, Italy) of the INAF-Osservatorio Astronomico di Padova; NASA[NN12AR55G]; University of Iceland[72-305]; Instrument Centre for Danish Astrophysics[306531]; INAF[A50TAC_41]; Jet Propulsion Laboratory - National Aeronautics and Space Administration
WOS研究方向	Astronomy & Astrophysics
语种	英语
WOS记录号	WOS:001754581500001
出版者	EDP SCIENCES S A
资助机构	PRIN-INAF[2022] ; Spanish Ministerio de Ciencia e Innovacin ; Program Unidad de Excelencia Maria de Maeztu[CEX2020-001058-M] ; Research Council of Finland[350458] ; Danish National Research Foundation[DNRF140] ; Independent Research Fund Denmark[10.46540/2032-00022B] ; National Natural Science Foundation of China[12303054] ; National Key Research and Development Program of China[2024YFA1611603] ; Yunnan Fundamental Research Projects[202501AS070078] ; International Centre of Supernovae, Yunnan Key Laboratory[202302AN360001] ; Schmidt telescopes (Asiago Ekar, Italy) of the INAF-Osservatorio Astronomico di Padova ; NASA[NN12AR55G] ; University of Iceland[72-305] ; Instrument Centre for Danish Astrophysics[306531] ; INAF[A50TAC_41] ; Jet Propulsion Laboratory - National Aeronautics and Space Administration
版本	出版稿
源URL	[http://ir.ynao.ac.cn/handle/114a53/29172]
专题	云南天文台_丽江天文观测站（南方基地）
通讯作者	Reguitti, A.
作者单位	1.INAF – Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, I-35122 Padova, Italy; 2.INAF – Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate (LC), Italy; 3.American Association of Variable Star Observers (AAVSO), 185 Alewife Brook Parkway, Suite 410 Cambridge, MA 02138, USA; 4.Università degli Studi di Padova, Dipartimento di Fisica e Astronomia, Vicolo dell’Osservatorio 3, 35122 Padova, Italy; 5.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, P.R. China; 6.International Centre of Supernovae, Yunnan Key Laboratory, Kunming 650216, P.R. China; 7.Institute of Space Sciences (ICE, CSIC), Campus UAB, Carrer de Can Magrans s/n, 08193 Barcelona, Spain; 8.Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland; 9.INAF – Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, 34143 Trieste, Italy; 10.Cosmic Dawn Center (DAWN), Niels Bohr Institute, University of Copenhagen, Jagtvej 128, 2200 København N, Denmark;
推荐引用方式 GB/T 7714	Reguitti, A.,Pastorello, A.,Valerin, G.,et al. AT 2025abao: The fourth luminous red nova in M 31[J]. ASTRONOMY & ASTROPHYSICS,2026,709.
APA	Reguitti, A..,Pastorello, A..,Valerin, G..,Romanov, F. D..,Siviero, A..,...&Stritzinger, M. D..(2026).AT 2025abao: The fourth luminous red nova in M 31.ASTRONOMY & ASTROPHYSICS,709.
MLA	Reguitti, A.,et al."AT 2025abao: The fourth luminous red nova in M 31".ASTRONOMY & ASTROPHYSICS 709(2026).

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来源：云南天文台

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AT 2025abao: The fourth luminous red nova in M 31

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