1. Periodic eclipses of the young star PDS 110 discovered with WASP and KELT photometry
- Author
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David J. James, Keivan G. Stassun, Richard G. West, Connor Robinson, B. S. Gaudi, Hugh P. Osborn, K. Z. Stanek, Gil Esquerdo, Matthew A. Kenworthy, Allyson Bieryla, David J. Armstrong, Catherine Espaillat, Daniel J. Stevens, Joseph E. Rodriguez, Michael B. Lund, Coel Hellier, Eric E. Mamajek, J. L. Prieto, Joshua Pepper, Christopher S. Kochanek, Robert J. Siverd, Thomas G. Beatty, Rudolf B. Kuhn, Perry Berlind, B. J. Shappee, D. W. Latham, David R. Anderson, Mike Calkins, Grant M. Kennedy, Don Pollacco, and Thomas W.-S. Holoien
- Subjects
Physics ,Earth and Planetary Astrophysics (astro-ph.EP) ,Infrared excess ,010308 nuclear & particles physics ,Star (game theory) ,Brown dwarf ,Astronomy ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,Orbital period ,01 natural sciences ,Orbit ,Photometry (astronomy) ,Space and Planetary Science ,Planet ,0103 physical sciences ,QB460 ,010303 astronomy & astrophysics ,Eclipse ,Astrophysics - Earth and Planetary Astrophysics - 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 KELT surveys. PDS 110 (HD 290380, IRAS 05209-0107) is a rare Fe/Ge-type star, a ~10 Myr-old accreting intermediate-mass star showing strong infrared excess (L$_{\rm IR}$/L$_{\rm bol}$ ~ 0.25). Two extremely similar eclipses with a depth of ~30\% and duration ~25 days were observed in November 2008 and January 2011. We interpret the eclipses as caused by the same structure with an orbital period of $808\pm2$ days. Shearing over a single orbit rules out diffuse dust clumps as the cause, favouring the hypothesis of a companion at ~2AU. The characteristics of the eclipses are consistent with transits by an unseen low-mass (1.8-70M$_{Jup}$) planet or brown dwarf with a circum-secondary disc of diameter ~0.3 AU. The next eclipse event is predicted to take place in September 2017 and could be monitored by amateur and professional observatories across the world., Comment: 10 pages, 6 figures, submitted to MNRAS 9th Feb 2017. Accepted 18th May 2017
- Published
- 2017