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  • 1. Osborn, H. P.
    et al.
    Kenworthy, M.
    Rodriguez, J. E.
    de Mooij, E. J. W.
    Kennedy, G. M.
    Relles, H.
    Gomez, E.
    Hippke, M.
    Banfi, M.
    Barbieri, L.
    Becker, I. S.
    Benni, P.
    Berlind, P.
    Bieryla, A.
    Bonnoli, G.
    Boussier, H.
    Brincat, S. M.
    Briol, J.
    Burleigh, M. R.
    Butterley, T.
    Calkins, M. L.
    Chote, P.
    Ciceri, Simona
    Stockholm University, Faculty of Science, Department of Astronomy.
    Deldem, M.
    Dhillon, V. S.
    Dose, E.
    Dubois, F.
    Dvorak, S.
    Esquerdo, G. A.
    Evans, D. F.
    Ferratfiat, S.
    Fossey, S. J.
    Günther, M. N.
    Hall, J.
    Hambsch, F.-J.
    Herrero, E.
    Hills, K.
    James, R.
    Jayawardhana, R.
    Kafka, S.
    Killestein, T. L.
    Kotnik, C.
    Latham, D. W.
    Lemay, D.
    Lewin, P.
    Littlefair, S.
    Lopresti, C.
    Mallonn, M.
    Mancini, L.
    Marchini, A.
    McCormac, J. J.
    Murawski, G.
    Myers, G.
    Papini, R.
    Popov, V.
    Quadri, U.
    Quinn, S. N.
    Raynard, L.
    Rizzuti, L.
    Robertson, J.
    Salvaggio, F.
    Scholz, A.
    Sfair, R.
    Smith, A. M. S.
    Southworth, J.
    Tan, T. G.
    Vanaverbeke, S.
    Waagen, E. O.
    Watson, C. A.
    West, R. G.
    Winter, O. C.
    Wheatley, P. J.
    Wilson, R. W.
    Zhou, G.
    The PDS 110 observing campaign - photometric and spectroscopic observations reveal eclipses are aperiodic2019In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 485, no 2, p. 1614-1625Article in journal (Refereed)
    Abstract [en]

    PDS 110 is a young disc-hosting star in the Orion OB1A association. Two dimming events of similar depth and duration were seen in 2008 (WASP) and 2011 (KELT), consistent with an object in a closed periodic orbit. In this paper, we present data from a ground-based observing campaign designed to measure the star both photometrically and spectroscopically during the time of predicted eclipse in 2017 September. Despite high-quality photometry, the predicted eclipse did not occur, although coherent structure is present suggesting variable amounts of stellar flux or dust obscuration. We also searched for radial velocity (RV) oscillations caused by any hypothetical companion and can rule out close binaries to 0.1Ms. Asearch of Sonneberg plate archive data also enabled us to extend the photometric baseline of this star back more than 50 yr, and similarly does not re-detect any deep eclipses. Taken together, they suggest that the eclipses seen in WASP and KELT photometry were due to aperiodic events. It would seem that PDS 110 undergoes stochastic dimmings that are shallower and of shorter duration than those of UX Ori variables, but may have a similar mechanism.

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