Osborn, HP, Rodriguez, JE, Kenworthy, MA, Kennedy, GM, Mamajek, EE, Robinson, CE, Espaillat, CC, Armstrong, DJ, Shappee, BJ, Bieryla, A, Latham, DW, Anderson, DR, Beatty, TG, Berlind, P, Calkins, ML, Esquerdo, GA, Gaudi, BS, Hellier, C, Holoien, TW-S, James, D, Kochanek, CS, Kuhn, RB, Lund, MB, Pepper, J, Pollacco, DL, Prieto, JL, Siverd, RJ, Stassun, KG, Stevens, DJ, Stanek, KZ and West, RG (2017) Periodic eclipses of the young star PDS 110 discovered with WASP and KELT photometry. Monthly Notices of the Royal Astronomical Society, 471 (1). 740 -749. ISSN 0035-8711

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We report the discovery of eclipses by circumstellar disc material associated with the young star PDS 110 in the Ori OB1a association using the SuperWASP and Kilodegree Extremely Little Telescope surveys. PDS 110 (HD 290380, IRAS 05209-0107) is a rare Fe/Ge-type star, an similar to 10 Myr-old accreting intermediate-mass star showing strong infrared excess (L-IR/L-bol similar or equal to 0.25). Two extremely similar eclipses with a depth of 30 per cent and duration similar to 25 d were observed in 2008 November and 2011 January. We interpret the eclipses as caused by the same structure with an orbital period of 808 +/- 2 d. Shearing over a single orbit rules out diffuse dust clumps as the cause, favouring the hypothesis of a companion at similar to 2 au. The characteristics of the eclipses are consistent with transits by an unseen low-mass (1.8-70M(Jup)) planet or brown dwarf with a circumsecondary disc of diameter similar to 0.3 au. The next eclipse event is predicted to take place in 2017 September and could be monitored by amateur and professional observatories across the world.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: protoplanetary discs, circumstellar matter, stars, individual, PDS 110, pre-main-sequence, variables, T Tauri, Herbig Ae/Be
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 07 Sep 2017 08:29
Last Modified: 18 Jun 2018 14:11
URI: https://eprints.keele.ac.uk/id/eprint/3995

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