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

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posted on 2019-10-14, 08:30 authored by HP Osborn, M Kenworthy, JE Rodriguez, EJW de Mooij, GM Kennedy, H Relles, E Gomez, M Hippke, M Banfi, L Barbieri, IS Becker, P Benni, P Berlind, A Bieryla, G Bonnoli, H Boussier, SM Brincat, J Briol, MR Burleigh, T Butterley, ML Calkins, P Chote, S Ciceri, M Deldem, VS Dhillon, E Dose, F Dubois, S Dvorak, GA Esquerdo, DF Evans, S Ferratfiat, SJ Fossey, MN Gunther, J Hall, F-J Hambsch, E Herrero, K Hills, R James, R Jayawardhana, S Kafka, TL Killestein, C Kotnik, DW Latham, D Lemay, P Lewin, S Littlefair, C Lopresti, M Mallonn, L Mancini, A Marchini, JJ McCormac, G Murawski, G Myers, R Papini, V Popov, U Quadri, SN Quinn, L Raynard, L Rizzuti, J Robertson, F Salvaggio, A Scholz, R Sfair, AMS Smith, J Southworth, TG Tan, S Vanaverbeke, EO Waagen, CA Watson, RG West, OC Winter, PJ Wheatley, RW Wilson, G Zhou
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. A search 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.

Funding

This work is based on observations collected with LCOGT under program LCO2017AB-003, and the European Southern Observatory, Chile under programme 299.C-5047. This research has used Astropy,10 a community-developed core PYTHON package for Astronomy (Astropy Collaboration 2013; Price-Whelan et al. 2018) and of Matplotlib (Hunter 2007). We thank our anonymous referee for their helpful comments. We acknowledge with thanks the variable star observations from the AAVSO International Data base contributed by observers worldwide and used in this research. HPO acknowledges support from Centre National d’Etudes Spatiales (CNES) grant 131425-PLATO. MH thanks Frank (Theo) Matthai for assistance with finding the relevant Sonneberg plates in the observatory archive. This work has used the VALD data base, operated at Uppsala University, the Institute of Astronomy RAS in Moscow, and the University of Vienna. EH acknowledges support by the Spanish Ministry of Economy and Competitiveness (MINECO) and the Fondo Europeo de Desarrollo Regional (FEDER) through grant ESP2016-80435-C2-1-R, as well as the support of the Generalitat de Catalunya/CERCA programme. The Joan Oró Telescope (TJO) of the Montsec Astronomical Observatory (OAdM) is owned by the Generalitat de Catalunya and operated by the Institute for Space Studies of Catalonia (IEEC). pt5m is a collaborative effort between the Universities of Durham and Sheffield. The telescope is kindly hosted by the Isaac Newton Group of Telescopes, La Palma. GMK is supported by the Royal Society as a Royal Society University Research Fellow. TB and RWW acknowledge support from the UK Science and Technology Facilities Council (STFC; reference ST/P000541/1). PC acknowledges funding from the European Research Council under the European Union’s Seventh Framework Programme (FP/2007-2013) / ERC Grant Agreement n. 320964 (WDTracer). This paper uses observations made at the SAAO. ASAS-SN light curves are primarily funded by Gordon & Betty Moore Fo

History

Citation

Monthly Notices of the Royal Astronomical Society, 2019, 485 (2), pp. 1614-1625 (12)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

  • VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society

Publisher

Oxford University Press (OUP), Royal Astronomical Society

issn

0035-8711

eissn

1365-2966

Acceptance date

2019-01-23

Copyright date

2019

Available date

2019-10-14

Publisher version

https://academic.oup.com/mnras/article/485/2/1614/5304181

Language

en