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COMMON ENVELOPE EJECTION FOR A LUMINOUS RED NOVA IN M101
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Rekke forfattare: 332017 (engelsk)Inngår i: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 834, nr 2, artikkel-id 107Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We present the results of optical, near-infrared, and mid-infrared observations of M101 OT2015-1 (PSN J14021678+ 5426205), a luminous red transient in the Pinwheel galaxy (M101), spanning a total of 16 years. The light curve showed two distinct peaks with absolute magnitudes M-r <= -12.4 and M-r similar or equal to -12, on 2014 November 11 and 2015 February 17, respectively. The spectral energy distributions during the second maximum show a cool outburst temperature of approximate to 3700 K and low expansion velocities (approximate to -300 km s(-1)) for the H I, Ca II, Ba II, and K I lines. From archival data spanning 15-8 years before the outburst, we find a single source consistent with the optically discovered transient, which we attribute to being the progenitor; it has properties consistent with being an F-type yellow supergiant with L similar to 8.7 x 10(4) L-circle dot, T-eff approximate to 7000. K, and an estimated mass of M1= 18 +/- 1 M-circle dot. This star has likely just finished the H-burning phase in the core, started expanding, and is now crossing the Hertzsprung gap. Based on the combination of observed properties, we argue that the progenitor is a binary system, with the more evolved system overfilling the Roche lobe. Comparison with binary evolution models suggests that the outburst was an extremely rare phenomenon, likely associated with the ejection of the common envelope of a massive star. The initial mass of the primary fills the gap between the merger candidates V838 Mon (5-10 M-circle dot) and NGC. 4490-OT. (30M(circle dot)).

sted, utgiver, år, opplag, sider
2017. Vol. 834, nr 2, artikkel-id 107
Emneord [en]
binaries: close, novae, cataclysmic variables, stars: individual (M101 OT2015-1, PSN J14021678+5426205), stars: massive, stars: winds, outflows
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-141234DOI: 10.3847/1538-4357/834/2/107ISI: 000393677700001OAI: oai:DiVA.org:su-141234DiVA, id: diva2:1089036
Tilgjengelig fra: 2017-04-18 Laget: 2017-04-18 Sist oppdatert: 2022-02-28bibliografisk kontrollert

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Fremling, ChristofferSollerman, JesperTaddia, Francesco

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