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**New 1st Author Paper***
"Decaying Orbit of the Hot Jupiter WASP-12b: Confirmation with TESS Observations"
Paper can be found here: https://arxiv.org/abs/2012.02211
Co-authors: @AstroAndrew123 @DrRayJay
THREAD/
@CSInst @CornellAstro @Cornell @NASA_TESS
#Exoplanets #Astronomy @NASApic.twitter.com/OEyf0GvdrM
WASP-12b is an ultra-hot Jupiter (~2600 K) that has been studied extensively since 2009. It is thought to have clouds made of corundum. Also, the atmosphere of the planet is escaping & will completely evaporate in 300 Myr. But what about its orbit? 1/pic.twitter.com/QNqnh6d2Lq
Maciejewski et al. 2016 (https://arxiv.org/abs/1602.09055 ) were the first to report evidence of a decreasing orbital period for WASP-12b. Follow-up observations by Yee et al. 2020 (https://arxiv.org/abs/1911.09131 ) determined conclusively that the orbit of WASP-12b was decaying. 2/pic.twitter.com/PZyBYC8BYj
Observations of orbital decay on close-in planets enhances our understanding of the hot Jupiter population and their evolution 3/pic.twitter.com/ZqgJSEvJA5
Motivated by these indications of WASP-12b’s changing period, my team (@AstroAndrew123, @DrRayJay) decided to use observations from @NASA’s @NASA_TESS to verify its orbital decay, and derive updated orbital parameters and planetary properties.
4/pic.twitter.com/QxLoEKm93c
We modeled each individual transit (the phase folded light curve is below). We also detected the occultation of the planet but only after binning the entire @NASA_TESS data
These data were modeled with the EXOplanet Modeling Package (EXOMOP) developed in my PhD
5/pic.twitter.com/TKKGKPx2UO
We found that the timing data from the transits & occultation from @NASA_TESS confirmed the decaying orbit of WASP-12b!
We compared the decaying orbit model with an apsidal precession model and the decaying orbit model fit the data much better.
6/pic.twitter.com/NRbp7Nbamx
Our finding indicates an orbital decay lifetime of 2.9 Myr, shorter than the estimated mass-loss timescale of 300 Myr. We also find a modified tidal quality factor of Q’⋆ = 1.39×10^5. The cause of such a low tidal quality factor requires additional theoretical work 7/pic.twitter.com/DkGOqDdtoD
Our study highlights the power of long-term high-precision ground & space-based transit & occultation observations for understanding the orbital evolution of close-in giant planets.
It will be interesting to see what other discoveries @NASA_TESS will make in the future
8/8
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