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Exoplanet Discoveries, discussion of the latest finds
Mongo
post Feb 28 2017, 08:21 PM
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Towards Detection of Exoplanetary Rings Via Transit Photometry: Methodology and a Possible Candidate

Abstract: Detection of a planetary ring of exoplanets remains as one of the most attractive but challenging goals in the field. We present a methodology of a systematic search for exoplanetary rings via transit photometry of long-period planets. The methodology relies on a precise integration scheme 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 a majority of our samples do not have a sufficiently good signal-to-noise ratio for meaningful constraints on ring parameters, we find that six systems with a higher signal-to-noise ratio 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 other two 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.
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Explorer1
post Mar 1 2017, 12:17 AM
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Very cool; reminds me of J1407 ( https://en.wikipedia.org/wiki/1SWASP_J140747.93-394542.6 ).
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marsbug
post Mar 8 2017, 02:47 AM
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Somehow I'd mised that - a ring system with the mass of Earth, and 0.6 A.U. radius. Incredible!


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TheAnt
post Mar 19 2017, 01:29 PM
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Of minor importance perhaps, yet more observations have revealed that Trappist 1h orbit the central star each 18.764 days, a value near what what predicted.
The radius turned out to be 0.715, while the calculated temperature at 169 K would make it a very cold world, which again is in line with predictions.

A terrestrial-sized exoplanet at the snow line of TRAPPIST-1

Some datasets seen on Astrobiology web

And a Youtube film where 'Universe sandbox' is used, even though it's probably not a fully reliable model.I think he get quite close to the mark there.
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