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Photometry of WD 1145+017 in Early 2017

  • Diana P. Kjurkchieva (a1), Dinko P. Dimitrov (a1) (a2) and Nikola I. Petrov (a2)

We present photometric observations of WD 1145+017 during six nights in early 2017. They exhibited asymmetric transits with durations of 10–50 mins and depths up to 50% in flux. We managed to track two deep features that drift in phase during 2.5-month season. This effect may be explained by period decreasing of the transiting formations due to their slow spiralling to the white dwarf. One of them seems to fragment in several smaller parts within a month. The structures causing the two deep transits have elongated shape whose sizes perpendicular and along the orbit are of the order of 1 R⊕ and 100 R⊕. They are parts of geometrically thin inhomogeneous disk (ring) around the white dwarf that is well within its Roche radius. This explains the observed dip activity of WD 1145+017 during the year 2017.

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Based on observations at NAO Rozhen.

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Publications of the Astronomical Society of Australia
  • ISSN: 1323-3580
  • EISSN: 1448-6083
  • URL: /core/journals/publications-of-the-astronomical-society-of-australia
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