We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.

Durham Research Online
You are in:

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 Günther, 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 (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.


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.

Item Type:Article
Full text:(VoR) Version of Record
Download PDF
Publisher Web site:
Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. Published by Oxford University Press on behalf of the Royal Astronomical Society.
Date accepted:No date available
Date deposited:26 June 2019
Date of first online publication:29 January 2019
Date first made open access:26 June 2019

Save or Share this output

Look up in GoogleScholar