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Anomalous lightcurves of young tilted exorings | | Mario Sucerquia
; J.A. Alvarado-Montes
; Vanesa Ramírez
; Jorge I. Zuluaga
; | | Date: |
15 Aug 2017 | | Abstract: | Despite the success of discovering transiting exoplanets, several recently
observed objects (e.g. KIC-8462852, J1407b) exhibit irregular and variable
transit signals, whose appropriate interpretation in terms of a spherical
single object has been challenging, if not impossible. In the aforementioned
examples the presence of a ring-like structure has been proposed for explaining
the unconventional data. Thus, in this paper we study the dynamics of a tilted
exoring, and the role that the Lidov-Kozai mechanism may have to explain
irregular and anomalous transit signals of close-in ringed planets, as well as
the rings’ early evolutionary stages. To that end, we performed numerical
simulations and semi-analytical calculations of the evolving ring’s properties
and their related transit observables. We found that tilted ringed structures
undergo short-term changes in shape and orientation that are manifested as
strong variations of transit depth and contact times, even between consecutive
eclipses. Any detected anomaly in transit characteristics may lead to a
miscalculation of the system’s properties (planetary radius, semi-major axis,
stellar density and others). Moreover, oscillating ring-like structures may
account for the strangeness of some light-curve features in already known and
future discovered exoplanets. | | Source: | arXiv, 1708.4600 | | Services: | Forum | Review | PDF | Favorites | |
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