No transit timing variations for OGLE-TR-111 b

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No transit timing variations for OGLE-TR-111 b

Post by Sirius_Alpha on 2nd March 2010, 9:17 pm

Lack of Transit Timing Variations of OGLE-TR-111b: A re-analysis with six new epochs
http://arxiv.org/abs/1003.0457

Abstract wrote:We present six new transits of the exoplanet OGLE-TR-111b observed with the Magellan Telescopes in Chile between April 2008 and March 2009. We combine these new transits with five previously published transit epochs for this planet between 2005 and 2006 to extend the analysis of transit timing variations reported for this system. We derive a new planetary radius value of 1.019 +/- 0.026 R_J, which is intermediate to the previously reported radii of 1.067 +/- 0.054 R_J (Winn et al. 2007) and 0.922 +/- 0.057 R_J (Diaz et al. 2008). We also examine the transit timing variation and duration change claims of Diaz et al. (2008). Our analysis of all eleven transit epochs does not reveal any points with deviations larger than 2 sigma, and most points are well within 1 sigma. Although the transit duration nominally decreases over the four year span of the data, systematic errors in the photometry can account for this result. Therefore, there is no compelling evidence for either a timing or a duration variation in this system. Numerical integrations place an upper limit of about 1 M_E on the mass of a potential second planet in a 2:1 mean-motion resonance with OGLE-TR-111b.

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Re: No transit timing variations for OGLE-TR-111 b

Post by Edasich on 3rd March 2010, 4:42 am

Cool. More than two months of non discoveries Rolling Eyes

However, strange somebody claims TTV and another affirms the opposite.
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Re: No transit timing variations for OGLE-TR-111 b

Post by Lazarus on 3rd March 2010, 2:45 pm

Well TTV seems to be as jinxed as astrometry... first GJ 436, now OGLE-TR-111. All we need now is for someone to shoot down TrES-2...

As for no discoveries, not entirely fair, there's stuff being done on characterisation (e.g. the recent HD 38529 result).
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Re: No transit timing variations for OGLE-TR-111 b

Post by Sirius_Alpha on 4th March 2010, 4:19 pm

Maybe planets in 2:1 resonances with hot Jupiters are just rare. Is there any reason why they should be super-Earths? If they were common, we perhaps should have found resonant hot Jupiters.

But then again, hot Jupiters don't seem to favor multiple-planet systems as far as we can tell.

Maybe TTV's are rare because the conditions in which they may arise are rare.

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Re: No transit timing variations for OGLE-TR-111 b

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