@article{bcd178d644d64d578154f33cfc219179,
title = "Periodic eclipses of the young star PDS 110 discovered withWASP and KELT photometry",
abstract = "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 ~10 Myr-old accreting intermediate-mass star showing strong infrared excess (LIR/Lbol ≃ 0.25). Two extremely similar eclipses with a depth of 30 per cent and duration ~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 ~2 au. The characteristics of the eclipses are consistent with transits by an unseen low-mass (1.8-70MJup) planet or brown dwarf with a circumsecondary disc of diameter ~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.",
keywords = "Circumstellar matter, Herbig Ae/Be, Protoplanetary discs, Stars: individual: PDS 110, Stars: pre-main-sequence, Stars: variables: T Tauri",
author = "Osborn, {H. P.} and Rodriguez, {J. E.} and Kenworthy, {M. A.} and Kennedy, {G. M.} and Mamajek, {E. E.} and Robinson, {C. E.} and Espaillat, {C. C.} and Armstrong, {D. J.} and Shappee, {B. J.} and A. Bieryla and Latham, {D. W.} and Anderson, {D. R.} and Beatty, {T. G.} and P. Berlind and Calkins, {M. L.} and Esquerdo, {G. A.} and Gaudi, {B. S.} and C. Hellier and Holoien, {T. W.S.} and D. James and Kochanek, {C. S.} and Kuhn, {R. B.} and Lund, {M. B.} and J. Pepper and Pollacco, {D. L.} and Prieto, {J. L.} and Siverd, {R. J.} and Stassun, {K. G.} and Stevens, {D. J.} and Stanek, {K. Z.} and West, {R. G.}",
note = "Funding Information: The authors thank the Lorentz Center at Universiteit Leiden for supporting the 'Rocks, Rubble and Rings: Understanding Deep and Irregular Transits' workshop in 2016. HPO was funded by a University of Warwick Chancellor's Scholarship. Work performed by JER was supported by the Harvard Future Faculty Leaders Postdoctoral fellowship. GMK is supported by the Royal Society as a Royal Society University Research Fellow. Early work on KELTNorth was supported by NASA Grant NNG04GO70G. JAP and KGS acknowledge support from theVanderbilt Office of the Provost through the Vanderbilt Initiative in Data-intensive Astrophysics. This work has made use of NASA's Astrophysics Data System and the SIMBAD data base operated at CDS, Strasbourg, France. This paper is under review for unlimited release (URS265682). DJA acknowledges funding from the European Union Seventh Framework programme (FP7/2007-2013) under grant agreement No. 313014 (ETAEARTH).Work by BSG was partially supported by NSF CAREER Grant AST-1056524. Work by KGS was supported by NSF PAARE grant AST-1358862. EEM acknowledges support from the NASA NExSS program. Part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. TW-SH is supported by the DOE Computational Science Graduate Fellowship, grant numberDE-FG02-97ER25308. CSK and KZS are supported by NSF grants AST-1515876 and AST-1515927. This research made use of Astropy, a community-developed core Python package for Astronomy (Astropy Collaboration et al. 2013). Publisher Copyright: {\textcopyright} 2018 The Author(s).",
year = "2017",
doi = "10.1093/MNRAS/STX1249",
language = "English (US)",
volume = "471",
pages = "740--749",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "1",
}