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Full-Text Articles in Physical Sciences and Mathematics
Infrared Eclipses Of The Strongly Irradiated Planet Wasp-33b, And Oscillations Of Its Host Star, Drake Deming, Jonathan D. Fraine, Pedro V. Sada, Nikku Madhusudhan, Heather A. Knutson, Joseph Harrington, Jasmina Blecic, Sarah Nymeyer, Alexis M.S. Smith, Brian Jackson
Infrared Eclipses Of The Strongly Irradiated Planet Wasp-33b, And Oscillations Of Its Host Star, Drake Deming, Jonathan D. Fraine, Pedro V. Sada, Nikku Madhusudhan, Heather A. Knutson, Joseph Harrington, Jasmina Blecic, Sarah Nymeyer, Alexis M.S. Smith, Brian Jackson
Brian Jackson
We observe two secondary eclipses of the strongly irradiated transiting planet WASP-33b, in the Ks band at 2.15 μm, and one secondary eclipse each at 3.6 μm and 4.5 μm using Warm Spitzer. This planet orbits an A5V δ-Scuti star that is known to exhibit low-amplitude non-radial p-mode oscillations at about 0.1% semi-amplitude. We detect stellar oscillations in all of our infrared eclipse data, and also in one night of observations at J band (1.25 μm) out of eclipse. The oscillation amplitude, in all infrared bands except Ks, is about the same as in the optical. However, the stellar oscillations …
The Evil-Mc Model For Ellipsoidal Variations Of Planet-Hosting Stars And Applications To The Hat-P-7 System, Brian K. Jackson, Nikole K. Lewis, Jason W. Barnes, L. Drake Deming, Adam P. Showman, Jonathan J. Fortney
The Evil-Mc Model For Ellipsoidal Variations Of Planet-Hosting Stars And Applications To The Hat-P-7 System, Brian K. Jackson, Nikole K. Lewis, Jason W. Barnes, L. Drake Deming, Adam P. Showman, Jonathan J. Fortney
Brian Jackson
We present a new model for Ellipsoidal Variations Induced by a Low-Mass Companion, the EVIL-MC model. We employ several approximations appropriate for planetary systems to substantially increase the computational efficiency of our model relative to more general ellipsoidal variation models and improve upon the accuracy of simpler models. This new approach gives us a unique ability to rapidly and accurately determine planetary system parameters. We use the EVIL-MC model to analyze Kepler Quarter 0-2 (Q0-2) observations of the HAT-P-7 system, an F-type star orbited by a ~ Jupiter-mass companion. Our analysis corroborates previous estimates of the planet-star mass ratio q …
Constraining Tidal Dissipation In Stars From The Destruction Rates Of Exoplanets, Kaloyan Penev, Brian Jackson, Federico Spada, Nicole Thom
Constraining Tidal Dissipation In Stars From The Destruction Rates Of Exoplanets, Kaloyan Penev, Brian Jackson, Federico Spada, Nicole Thom
Brian Jackson
We use the distribution of extrasolar planets in circular orbits around stars with surface convective zones detected by ground-based transit searches to constrain how efficiently tides raised by the planet are dissipated on the parent star. We parameterize this efficiency as a tidal quality factor (Q*). We conclude that the population of currently known planets is inconsistent with Q* < 107 at the 99% level. Previous studies show that values of Q* between 105 and 107 are required in order to explain the orbital circularization of main-sequence low-mass binary stars in clusters, suggesting that different dissipation mechanisms might be acting in the two cases, most likely due to the very different tidal forcing frequencies relative to the stellar rotation frequency occurring for star-star versus planet-star systems.