Discovery of a nova super-remnant surrounding the recurrent nova LMCN 1971-08a in the Large Magellanic Cloud

Healy-Kalesh, MW ORCID: 0000-0001-6337-6871, Sasaki, M ORCID: 0000-0001-5302-1866, Points, SD ORCID: 0000-0002-4596-1337, Filipović, MD ORCID: 0000-0002-4990-9288, Smeaton, ZJ ORCID: 0009-0009-7061-0553, Darnley, MJ ORCID: 0000-0003-0156-3377, Long, KS ORCID: 0000-0002-4134-864X, Saeedi, S ORCID: 0000-0003-3777-0853 and Zangrandi, F ORCID: 0009-0003-6572-6937 (2025) Discovery of a nova super-remnant surrounding the recurrent nova LMCN 1971-08a in the Large Magellanic Cloud. Astronomy & Astrophysics, 702. L9-L9. ISSN 0004-6361

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Abstract

A nova super-remnant (NSR) is a greatly-extended structure grown by repeated nova eruptions sweeping the surrounding material away from a nova into a dense outer shell and are predicted to form around all novae. To date, four NSRs are known, with three located in the Galaxy and one residing in M31. Here we present the discovery of the first NSR in the Large Magellanic Cloud and only the second extragalactic nova shell identified, hosted by the recurrent nova LMCN 1971-08a. The structure is coincident with the nova, has a circular morphology, and is visible in narrowband Hα and [S II] filters but is very faint in [O III] , as expected. H I data also potentially reveal the existence of a coincident structure. Further, with a diameter of ∼200 pc, this NSR is the largest example yet found, with models indicating an ∼4130 M⊙ shell expanding at ∼20 km s−1 into the surrounding medium and an age of ∼2.4 Myr. The existence of the NSR also suggests that LMCN 1971-08a may have a much shorter recurrence period than currently presumed.

Item Type:	Article
Uncontrolled Keywords:	5109 Space Sciences; 5107 Particle and High Energy Physics; 5101 Astronomical Sciences; 51 Physical Sciences; Generic health relevance; 0201 Astronomical and Space Sciences; Astronomy & Astrophysics; 5101 Astronomical sciences; 5107 Particle and high energy physics; 5109 Space sciences
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Astrophysics Research Institute
Publisher:	EDP Sciences
Date of acceptance:	16 September 2025
Date of first compliant Open Access:	29 October 2025
Date Deposited:	29 Oct 2025 14:25
Last Modified:	29 Oct 2025 14:45
DOI or ID number:	10.1051/0004-6361/202556670
URI:	https://researchonline.ljmu.ac.uk/id/eprint/27441

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