Forbidden hugs in pandemic times: I. Luminous red nova at 2019zhd, a new merger in M 31

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dc.contributor.authorPastorello, A.
dc.contributor.authorFraser, M.
dc.contributor.authorValerin, G.
dc.contributor.authorReguitti, A.
dc.contributor.authorItagaki, K.
dc.contributor.authorOchner, P.
dc.contributor.authorWilliams, S.C.
dc.contributor.authorJones, D.
dc.contributor.authorMunday, J.
dc.contributor.authorSmartt, S.J.
dc.contributor.authorSmith, K.W.
dc.contributor.authorSrivastav S., S.
dc.contributor.authorElias-Rosa, N.
dc.contributor.authorKankare, E.
dc.contributor.authorKaramehmetoglu, E.
dc.contributor.authorLundqvist, P.
dc.contributor.authorMazzali, P. A.
dc.contributor.authorMunari, U.
dc.contributor.authorStritzinger, M. D.
dc.contributor.authorTomasella, L.
dc.contributor.authorAnderson, J. P.
dc.contributor.authorChambers, K. C.
dc.contributor.authorRest, A.
dc.date.accessioned2022-06-02T16:10:34Z
dc.date.available2022-06-02T16:10:34Z
dc.date.issued2021-02-01
dc.descriptionIndexación Scopuses
dc.description.abstractWe present the follow-up campaign of the luminous red nova (LRN) AT 2019zhd, the third event of this class observed in M 31. The object was followed by several sky surveys for about five months before the outburst, during which it showed a slow luminosity rise. In this phase, the absolute magnitude ranged from Mr =-2.8 ± 0.2 mag to Mr =-5.6 ± 0.1 mag. Then, over a four to five day period, AT 2019zhd experienced a major brightening, reaching a peak of Mr =-9.61 ± 0.08 mag and an optical luminosity of 1.4 × 1039 erg s-1. After a fast decline, the light curve settled onto a short-duration plateau in the red bands. Although less pronounced, this feature is reminiscent of the second red maximum observed in other LRNe. This phase was followed by a rapid linear decline in all bands. At maximum, the spectra show a blue continuum with prominent Balmer emission lines. The post-maximum spectra show a much redder continuum, resembling that of an intermediate-type star. In this phase, Hα becomes very weak, Hβ is no longer detectable, and a forest of narrow absorption metal lines now dominate the spectrum. The latest spectra, obtained during the post-plateau decline, show a very red continuum (Teff ≈ 3000 K) with broad molecular bands of TiO, similar to those of M-type stars. The long-lasting, slow photometric rise observed before the peak resembles that of LRN V1309 Sco, which was interpreted as the signature of the common-envelope ejection. The subsequent outburst is likely due to the gas outflow following a stellar merging event. The inspection of archival HST images taken 22 years before the LRN discovery reveals a faint red source (MF555W = 0.21 ± 0.14 mag, with F555W-F814W = 2.96 ± 0.12 mag) at the position of AT 2019zhd, which is the most likely quiescent precursor. The source is consistent with expectations for a binary system including a predominant M5-type star.en
dc.identifier.citationAstronomy and Astrophysics Volume 6461 February 2021 Article number A119es
dc.identifier.doi10.1051/0004-6361/202039952
dc.identifier.issn0004-6361
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/22699
dc.language.isoenen
dc.publisherEDP Sciencesen
dc.subjectBinaries: closeen
dc.subjectOutflowsen
dc.subjectStars: individual: AT 2019zhden
dc.subjectStars: individual: M31-LRN2015en
dc.subjectStars: individual: M31-RVen
dc.subjectStars: individual: V838 Monen
dc.subjectStars: windsen
dc.titleForbidden hugs in pandemic times: I. Luminous red nova at 2019zhd, a new merger in M 31en
dc.typeArtículoen
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