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Title: Toward Detection of Exoplanetary Rings via Transit Photometry: Methodology and a Possible Candidate

Abstract

The detection of a planetary ring of exoplanets remains one of the most attractive, but challenging, goals in the field of exoplanetary science. We present a methodology that implements a systematic search for exoplanetary rings via transit photometry of long-period planets. This methodology relies on a precise integration scheme that we develop to compute a transit light curve of a ringed planet. We apply the methodology to 89 long-period planet candidates from the Kepler data so as to estimate, and/or set upper limits on, the parameters of possible rings. While the majority of our samples do not have sufficient signal-to-noise ratios (S/Ns) to place meaningful constraints on ring parameters, we find that six systems with higher S/Ns are inconsistent with the presence of a ring larger than 1.5 times the planetary radius, assuming a grazing orbit and a tilted ring. Furthermore, we identify five preliminary candidate systems whose light curves exhibit ring-like features. After removing four false positives due to the contamination from nearby stars, we identify KIC 10403228 as a reasonable candidate for a ringed planet. A systematic parameter fit of its light curve with a ringed planet model indicates two possible solutions corresponding to a Saturn-like planet with a tilted ring. There alsomore » remain two other possible scenarios accounting for the data; a circumstellar disk and a hierarchical triple. Due to large uncertain factors, we cannot choose one specific model among the three.« less

Authors:
; ;  [1];  [2];  [3]
  1. Department of Physics, The University of Tokyo, Tokyo, 113-0033 (Japan)
  2. Department of Physics, Tokyo Metropolitan University, Tokyo 192-4397 (Japan)
  3. Department of Earth and Planetary Science, The University of Tokyo, Tokyo 113-0033 (Japan)
Publication Date:
OSTI Identifier:
22663718
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (Online); Journal Volume: 153; Journal Issue: 4; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCOUNTING; ASTRONOMY; DATA ANALYSIS; DETECTION; DIAGRAMS; LIMITING VALUES; NOISE; ORBITS; PHOTOMETRY; SATELLITES; SATURN PLANET; SIGNALS; SIGNAL-TO-NOISE RATIO; STARS; VISIBLE RADIATION

Citation Formats

Aizawa, Masataka, Masuda, Kento, Suto, Yasushi, Uehara, Sho, and Kawahara, Hajime, E-mail: aizawa@utap.phys.s.u-tokyo.ac.jp. Toward Detection of Exoplanetary Rings via Transit Photometry: Methodology and a Possible Candidate. United States: N. p., 2017. Web. doi:10.3847/1538-3881/AA6336.
Aizawa, Masataka, Masuda, Kento, Suto, Yasushi, Uehara, Sho, & Kawahara, Hajime, E-mail: aizawa@utap.phys.s.u-tokyo.ac.jp. Toward Detection of Exoplanetary Rings via Transit Photometry: Methodology and a Possible Candidate. United States. doi:10.3847/1538-3881/AA6336.
Aizawa, Masataka, Masuda, Kento, Suto, Yasushi, Uehara, Sho, and Kawahara, Hajime, E-mail: aizawa@utap.phys.s.u-tokyo.ac.jp. Sat . "Toward Detection of Exoplanetary Rings via Transit Photometry: Methodology and a Possible Candidate". United States. doi:10.3847/1538-3881/AA6336.
@article{osti_22663718,
title = {Toward Detection of Exoplanetary Rings via Transit Photometry: Methodology and a Possible Candidate},
author = {Aizawa, Masataka and Masuda, Kento and Suto, Yasushi and Uehara, Sho and Kawahara, Hajime, E-mail: aizawa@utap.phys.s.u-tokyo.ac.jp},
abstractNote = {The detection of a planetary ring of exoplanets remains one of the most attractive, but challenging, goals in the field of exoplanetary science. We present a methodology that implements a systematic search for exoplanetary rings via transit photometry of long-period planets. This methodology relies on a precise integration scheme that we develop to compute a transit light curve of a ringed planet. We apply the methodology to 89 long-period planet candidates from the Kepler data so as to estimate, and/or set upper limits on, the parameters of possible rings. While the majority of our samples do not have sufficient signal-to-noise ratios (S/Ns) to place meaningful constraints on ring parameters, we find that six systems with higher S/Ns are inconsistent with the presence of a ring larger than 1.5 times the planetary radius, assuming a grazing orbit and a tilted ring. Furthermore, we identify five preliminary candidate systems whose light curves exhibit ring-like features. After removing four false positives due to the contamination from nearby stars, we identify KIC 10403228 as a reasonable candidate for a ringed planet. A systematic parameter fit of its light curve with a ringed planet model indicates two possible solutions corresponding to a Saturn-like planet with a tilted ring. There also remain two other possible scenarios accounting for the data; a circumstellar disk and a hierarchical triple. Due to large uncertain factors, we cannot choose one specific model among the three.},
doi = {10.3847/1538-3881/AA6336},
journal = {Astronomical Journal (Online)},
number = 4,
volume = 153,
place = {United States},
year = {Sat Apr 01 00:00:00 EDT 2017},
month = {Sat Apr 01 00:00:00 EDT 2017}
}