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The evolution of luminous red nova AT 2017jfs in NGC 4470 [Letter to the editor]

Pastorello, A., Chen, T.-W., Cai, Y.-Z., Morales-Garoffolo, A., Cano, Z., Mason, E., Barsukova, E. A., Benetti, S., Berton, M., Bose, S., Bufano, F., Callis, E., Cannizzaro, G., Cartier, R., Chen, Ping, Dong, Subo, Dyrbye, S., Elias-Rosa, N., Flörs, A., Fraser, M., Geier, S., Goranskij, V. P., Kann, D. A., Kuncarayakti, H., Onori, F., Reguitti, A., Reynolds, T., Losada, I. R., Sagués Carracedo, A., Schweyer, T., Smartt, S. J., Tatarnikov, A. M., Valeev, A. F., Vogl, C., Wevers, T., de Ugarte Postigo, A., Izzo, L., Inserra, C., Kankare, E., Maguire, K., Smith, K. W., Stalder, B., Tartaglia, L., Thöne, C. C., Valerin, G. and Young, D. R. 2019. The evolution of luminous red nova AT 2017jfs in NGC 4470 [Letter to the editor]. Astronomy and Astrophysics 625 , L8. 10.1051/0004-6361/201935511

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Abstract

We present the results of our photometric and spectroscopic follow-up of the intermediate-luminosity optical transient AT 2017jfs. At peak, the object reaches an absolute magnitude of Mg = −15.46 ± 0.15 mag and a bolometric luminosity of 5.5 × 1041 erg s−1. Its light curve has the double-peak shape typical of luminous red novae (LRNe), with a narrow first peak bright in the blue bands, while the second peak is longer-lasting and more luminous in the red and near-infrared (NIR) bands. During the first peak, the spectrum shows a blue continuum with narrow emission lines of H and Fe II. During the second peak, the spectrum becomes cooler, resembling that of a K-type star, and the emission lines are replaced by a forest of narrow lines in absorption. About 5 months later, while the optical light curves are characterized by a fast linear decline, the NIR ones show a moderate rebrightening, observed until the transient disappears in solar conjunction. At these late epochs, the spectrum becomes reminiscent of that of M-type stars, with prominent molecular absorption bands. The late-time properties suggest the formation of some dust in the expanding common envelope or an IR echo from foreground pre-existing dust. We propose that the object is a common-envelope transient, possibly the outcome of a merging event in a massive binary, similar to NGC 4490−2011OT1.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: EDP Sciences
ISSN: 0004-6361
Date of First Compliant Deposit: 4 June 2019
Date of Acceptance: 23 April 2019
Last Modified: 05 Jun 2019 10:45
URI: http://orca.cf.ac.uk/id/eprint/123157

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