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26 April 2024 |
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DM Ori: A Young Star Occulted by a Disturbance in its Protoplanetary Disk | | Joseph E. Rodriguez
; Keivan G. Stassun
; Phillip Cargile
; Benjamin J. Shappee
; Robert J. Siverd
; Joshua Pepper
; Michael B. Lund
; Christopher S. Kochanek
; David James
; Rudolf B. Kuhn
; Thomas G. Beatty
; B. Scott Gaudi
; David A. Weintraub
; Krzysztof Z. Stanek
; Thomas W. S. Holoien
; Jose L. Prieto
; Daniel M. Feldman
; Catherine C. Espaillat
; | | Date: |
25 Jul 2016 | | Abstract: | In some planet formation theories, protoplanets grow gravitationally within a
young star’s protoplanetary disk, a signature of which may be a localized
disturbance in the disk’s radial and/or vertical structure. Using time-series
photometric observations by the Kilodegree Extremely Little Telescope South
(KELT-South) project and the All-Sky Automated Survey for SuperNovae (ASAS-SN),
combined with archival observations, we present the discovery of two extended
dimming events of the young star, DM Ori. This young system faded by $sim$1.5
mag from 2000 March to 2002 August and then again in 2013 January until 2014
September (depth $sim$1.7 mag). We constrain the duration of the 2000-2002
dimming to be $<$ 860 days, and the event in 2013-2014 to be $<$ 585 days,
separated by $sim$12.5 years. A model of the spectral energy distribution
(SED) indicates a large infrared excess consistent with an extensive
circumstellar disk. Using basic kinematic arguments, we propose that DM Ori is
likely being periodically occulted by a feature (possibly a warp or
perturbation) in its circumstellar disk. In this scenario, the occulting
feature is located $>$6 AU from the host star, moving at $sim$14.6 km/s, and
is $sim$4.9 AU in width. This localized structure may indicate a disturbance
such as may be caused by a protoplanet early in its formation. | | Source: | arXiv, 1607.7455 | | Services: | Forum | Review | PDF | Favorites | |
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