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arXiv · 1901.07981

The PDS 110 observing campaign - photometric and spectroscopic observations reveal eclipses are aperiodic

Hugh P. Osborn·Matthew Kenworthy·Joseph E. Rodriguez·Ernst J. W. de Mooij·Grant M. Kennedy·Howard Relles·Edward Gomez·Michael Hippke·Massimo Banfi·Lorenzo Barbieri·Igor Becker·Paul Benni·Perry Berlind·Allyson Bieryla·Giacomo Bonnoli·Hubert Boussier·Stephen Brincat·John Briol·Matthew Burleigh·Tim Butterley·Michael L. Calkins·Paul Chote·Simona Ciceri·Marc Deldem·Vik S. Dhillon·Eric Dose·Frank Dubois·Shawn Dvorak·Gilbert A. Esquerdo·Daniel Evans·Stephane Ferratfiat Dagot Berangez·Stephen Fossey·Maximilian N. Güenther·John Hall·Josch Hambsch·Enrique Herrero Casas·Kevin Hills·Robert James·Stella Kafka·Thomas L. Killestein·Clifford Kotnik·David W. Latham·Damien Lemay·Pablo Lewin·Stuart Littlefair·Claudio Lopresti·Matthias Mallonn·Luigi Mancini·Alessandro Marchini·James J. McCormac·Gabriel Murawski·Gordon Myers·Ricardo Papini·Velimir Popov·Ulisse Quadri·Samuel N. Quinn·Liam Raynard·Luca Rizzuti·James Roa·Jeff Robertson·Fabio Salvaggio·Alexander Scholz·Rafael Sfair·Alexis M. S. Smith·John Southworth·TG Tan·Sigfried Vanaverbeke·Elizabeth O. Waagen·Christopher Watson·Richard West·P. J. Wheatley·Richard W. Wilson·Othon C. Winter·George Zhou
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Abstract

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.

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Hugh P. Osborn, Matthew Kenworthy, Joseph E. Rodriguez, Ernst J. W. de Mooij, Grant M. Kennedy, Howard Relles, Edward Gomez, Michael Hippke, Massimo Banfi, Lorenzo Barbieri, Igor Becker, Paul Benni, Perry Berlind, Allyson Bieryla, Giacomo Bonnoli, Hubert Boussier, Stephen Brincat, John Briol, Matthew Burleigh, Tim Butterley, Michael L. Calkins, Paul Chote, Simona Ciceri, Marc Deldem, Vik S. Dhillon, Eric Dose, Frank Dubois, Shawn Dvorak, Gilbert A. Esquerdo, Daniel Evans, Stephane Ferratfiat Dagot Berangez, Stephen Fossey, Maximilian N. Güenther, John Hall, Josch Hambsch, Enrique Herrero Casas, Kevin Hills, Robert James, Stella Kafka, Thomas L. Killestein, Clifford Kotnik, David W. Latham, Damien Lemay, Pablo Lewin, Stuart Littlefair, Claudio Lopresti, Matthias Mallonn, Luigi Mancini, Alessandro Marchini, James J. McCormac, Gabriel Murawski, Gordon Myers, Ricardo Papini, Velimir Popov, Ulisse Quadri, Samuel N. Quinn, Liam Raynard, Luca Rizzuti, James Roa, Jeff Robertson, Fabio Salvaggio, Alexander Scholz, Rafael Sfair, Alexis M. S. Smith, John Southworth, TG Tan, Sigfried Vanaverbeke, Elizabeth O. Waagen, Christopher Watson, Richard West, P. J. Wheatley, Richard W. Wilson, Othon C. Winter, George Zhou. 2019-01-23. The PDS 110 observing campaign - photometric and spectroscopic observations reveal eclipses are aperiodic. https://doi.org/10.1093/mnras/stz283

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