The PDS 110 observing campaign - photometric and spectroscopic observations reveal eclipses are aperiodic
Creators: name: Osborn, Hugh P.
name: Kenworthy, Matthew
name: Rodriguez, Joseph E.
name: de Mooij, Ernst J. W.
name: Kennedy, Grant M.
name: Relles, Howard
name: Gomez, Edward
name: Hippke, Michael
name: Banfi, Massimo
name: Barbieri, Lorenzo
name: Becker, Igor
name: Benni, Paul
name: Berlind, Perry
name: Bieryla, Allyson
name: Bonnoli, Giacomo
name: Boussier, Hubert
name: Brincat, Stephen
name: Briol, John
name: Burleigh, Matthew
name: Butterley, Tim
name: Calkins, Michael L.
name: Chote, Paul
name: Ciceri, Simona
name: Deldem, Marc
name: Dhillon, Vik S.
name: Dose, Eric
name: Dubois, Frank
name: Dvorak, Shawn
name: Esquerdo, Gilbert A.
name: Evans, Daniel
name: Berangez, Stephane Ferratfiat Dagot
name: Fossey, Stephen
name: Güenther, Maximilian N.
name: Hall, John
name: Hambsch, Josch
name: Casas, Enrique Herrero
name: Hills, Kevin
name: James, Robert
name: Kafka, Stella
name: Killestein, Thomas L.
name: Kotnik, Clifford
name: Latham, David W.
name: Lemay, Damien
name: Lewin, Pablo
name: Littlefair, Stuart
name: Lopresti, Claudio
name: Mallonn, Matthias
name: Mancini, Luigi
name: Marchini, Alessandro
name: McCormac, James J.
name: Murawski, Gabriel
name: Myers, Gordon
name: Papini, Ricardo
name: Popov, Velimir
name: Quadri, Ulisse
name: Quinn, Samuel N.
name: Raynard, Liam
name: Rizzuti, Luca
name: Roa, James
name: Robertson, Jeff
name: Salvaggio, Fabio
name: Scholz, Alexander
name: Sfair, Rafael
name: Smith, Alexis M. S.
name: Southworth, John
name: Tan, TG
name: Vanaverbeke, Sigfried
name: Waagen, Elizabeth O.
name: Watson, Christopher
name: West, Richard
name: Wheatley, P. J.
name: Wilson, Richard W.
name: Winter, Othon C.
name: Zhou, George
Publisher: name: arXiv
Year: 2019
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: PDS 110 is a young disk-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 September 2017. 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 RV oscillations caused by any hypothetical companion and can rule out close binaries to 0.1 $M_\odot$. A search of Sonneberg plate archive data also enabled us to extend the photometric baseline of this star back more than 50 years, 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 shorter-duration than those of UX Ori variables, but may have a similar mechanism.
description: Accepted to MNRAS; 12 pages, 7 figures; Supplementary photometric data in zipped latex source as all_photometry.csv