Search for circum-planetary material and orbital period variations of short-period Kepler exoplanet candidates
Article
Article Title | Search for circum-planetary material and orbital period variations of short-period Kepler exoplanet candidates |
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ERA Journal ID | 1049 |
Article Category | Article |
Authors | Garai, Z. (Author), Zhou, G. (Author), Budaj, J. (Author) and Stellingwerf, R. F. (Author) |
Journal Title | Astronomische Nachrichten |
Journal Citation | 335 (10), pp. 1018-1036 |
Number of Pages | 19 |
Year | 2014 |
Publisher | John Wiley & Sons |
Place of Publication | Germany |
ISSN | 0004-6337 |
1521-3994 | |
Digital Object Identifier (DOI) | https://doi.org/10.1002/asna.201312126 |
Web Address (URL) | https://onlinelibrary.wiley.com/doi/10.1002/asna.201312126 |
Abstract | A unique short-period (P = 0.65356(1) d) Mercury-size Kepler exoplanet candidate KIC012557548b has been discovered recently by Rappaport et al. (2012). This object is a transiting disintegrating exoplanet with a circum-planetary material-comet-like tail. Close-in exoplanets, like KIC012557548b, are subjected to the greatest planet-star interactions. This interaction may have various forms. In certain cases it may cause formation of the comet-like tail. Strong interaction with the host star, and/or presence of an additional planet may lead to variations in the orbital period of the planet. Our main aim is to search for comet-like tails similar to KIC012557548b and for long-term orbital period variations. We are curious about frequency of comet-like tail formation among short-period Kepler exoplanet candidates. We concentrate on a sample of 20 close-in candidates with a period similar to KIC012557548b from the Kepler mission. We first improved the preliminary orbital periods and obtained the transit light curves. Subsequently we searched for the signatures of a circum-planetary material in these light curves. For this purpose the final transit light curve of each planet was fitted with a theoretical light curve, and the residuals were examined for abnormalities. We then searched for possible long-term changes of the orbital periods using the method of phase dispersion minimization. In 8 cases out of 20 we found some interesting peculiarities, but none of the exoplanet candidates showed signs of a comet-like tail. It seems that the frequency of comet-like tail formation among short-period Kepler exoplanet candidates is very low. We searched for comet-like tails based on the period criterion. Based on our results we can conclude that the short-period criterion is not enough to cause comet-like tail formation. This result is in agreement with the theory of the thermal wind and planet evaporation (Perez-Becker & Chiang 2013). We also found 3 cases of candidates which showed some changes of the orbital period. Based on our results we can see that orbital period changes are not caused by comet-like tail disintegration processes, but rather by possible massive outer companions. |
Keywords | Planetary systems; Techniques: photometric; Astrophysics - Earth; Planetary Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Byline Affiliations | Slovak Academy of Sciences, Slovakia |
Australian National University | |
Stellingwerf Consulting, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q6x3v/search-for-circum-planetary-material-and-orbital-period-variations-of-short-period-kepler-exoplanet-candidates
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