Light curves of the latest FUor: Indication of a close binary

M. Hackstein, M. Haas, Kóspál, F. J. Hambsch, R. Chini, P. Ábrahám, A. Moór, F. Pozo Nuñez, M. Ramolla, Ch Westhues, L. Kaderhandt, Ch Fein, A. Barr Domínguez, K. W. Hodapp

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7 Citations (Scopus)

Abstract

We monitored the recent FUor 2MASS J06593158-0405277 (V960 Mon) since November 2009 at various observatories and multiple wavelengths. After the outburst by nearly 2.9 mag in r around September 2014 the brightness gently fades until April 2015 by nearly 1 mag in U and 0.5 mag in z. Thereafter the brightness at λ> 5000 Å was constant until June 2015 while the shortest wavelengths (U,B) indicate a new rise, similar to that seen for the FUor V2493 Cyg (HBC722). Our near-infrared (NIR) monitoring between December 2014 and April 2015 shows a smaller outburst amplitude (∼2 mag) and a smaller (0.2-0.3 mag) post-outburst brightness decline. Optical and NIR color-magnitude diagrams indicate that the brightness decline is caused by growing extinction. The post-outburst light curves are modulated by an oscillating color-neutral pattern with a period of about 17 days and an amplitude declining from ∼0.08 mag in October 2014 to ~0.04 mag in May 2015. The properties of the oscillating pattern lead us to suggest the presence of a close binary with eccentric orbit.

Original languageEnglish
Article numberL12
JournalAstronomy and Astrophysics
Volume582
DOIs
Publication statusPublished - Oct 1 2015

Keywords

  • Binaries: close
  • Stars: individual: 2MASS J06593158-0405277
  • Stars: variables: T Tauri, Herbig Ae/Be

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Hackstein, M., Haas, M., Kóspál, Hambsch, F. J., Chini, R., Ábrahám, P., Moór, A., Pozo Nuñez, F., Ramolla, M., Westhues, C., Kaderhandt, L., Fein, C., Barr Domínguez, A., & Hodapp, K. W. (2015). Light curves of the latest FUor: Indication of a close binary. Astronomy and Astrophysics, 582, [L12]. https://doi.org/10.1051/0004-6361/201527127