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The evolution of luminous red nova AT 2017jfs in NGC 4470

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Chen,  T.-W.
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

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Schweyer,  T.
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

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Citation

Pastorello, A., Chen, T.-W., Cai, Y.-Z., olo, A.-M.-G., Cano, Z., Mason, E., et al. (2019). The evolution of luminous red nova AT 2017jfs in NGC 4470. Astronomy and Astrophysics, 625: L8, pp. 1-7. doi:10.1051/0004-6361/201935511.


Cite as: http://hdl.handle.net/21.11116/0000-0003-B4F9-9
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.