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

Osborn, H. P. and Kenworthy, M. and Rodriguez, J. E. and de Mooij, E. J. W. and Kennedy, G. M. and Relles, H. and Gomez, E. and Hippke, M. and Banfi, M. and Barbieri, L. and Becker, I. S. and Benni, P. and Berlind, P. and Bieryla, A. and Bonnoli, G. and Boussier, H. and Brincat, S. M. and Briol, J. and Burleigh, M. R. and Butterley, T. and Calkins, M. L. and Chote, P. and Ciceri, S. and Deldem, M. and Dhillon, V. S. and Dose, E. and Dubois, F. and Dvorak, S. and Esquerdo, G. A. and Evans, D. F. and Ferratfiat, S. and Fossey, S. J. and Gunther, M. N. and Hall, J. and Hambsch, F. J. and Herrero, E. and Hills, K. and James, R. and Jayawardhana, R. and Kafka, S. and Killestein, T. L. and Kotnik, C. and Latham, D. W. and Lemay, D. and Lewin, P. and Littlefair, S. and Lopresti, C. and Mallonn, M. and Mancini, L. and Marchini, A. and McCormac, J. J. and Murawski, G. and Myers, G. and Papini, R. and Popov, V. and Quadri, U. and Quinn, S. N. and Raynard, L. and Rizzuti, L. and Robertson, J. and Salvaggio, F. and Scholz, A. and Sfair, R. and Smith, A. M. S. and Southworth, J. and Tan, T. G. and Vanaverbeke, S. and Waagen, E. O. and Watson, C. A. and West, R. G. and Winter, O. C. and Wheatley, P. J. and Wilson, R. W. and Zhou, G. ORCID: (2019) The PDS 110 observing campaign – photometric and spectroscopic observations reveal eclipses are aperiodic. Monthly Notices of the Royal Astronomical Society, 485 (2). pp. 1614-1625. ISSN 0035-8711

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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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 04 Mar 2022 01:17
Last Modified: 16 Mar 2022 23:02
Uncontrolled Keywords: Her-big Ae/Be; Protoplanetary discs; Stars: individual:PDS 110; Stars: variables: T Tauri; Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Earth and Planetary Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
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