Zobrazeno 1 - 10
of 158
pro vyhledávání: '"Lavvas, P. P."'
The atmospheric characterisation of GJ1214 b has so far remained uncertain due to the observed flatness of the transit spectra of this planet that is typically attributed to the presence of hazes or clouds in its atmosphere. Here we combine for the f
Externí odkaz:
http://arxiv.org/abs/2410.09981
Autor:
Stephenson, P., Koskinen, T. T., Brown, Z., Quémerais, E., Lavvas, P., Moses, J. I., Sandel, B., Yelle, R.
We examine Saturn's non-auroral (dayglow) emissions at Lyman-$\alpha$ observed by the {Cassini/UVIS} instrument from 2004 until 2016, to constrain meridional and seasonal trends in the upper atmosphere. We separate viewing geometry effects from trend
Externí odkaz:
http://arxiv.org/abs/2407.09389
Autor:
Arfaux, Anthony, Lavvas, Panayotis
We present a study on the coupling of haze and clouds in the atmosphere of WASP-39b. We developed a cloud microphysics model simulating the formation of Na2S and MgSiO3 condensates over photochemical hazes in gas giant atmospheres. We apply this mode
Externí odkaz:
http://arxiv.org/abs/2311.07365
Autor:
Sreejith, A. G., France, Kevin, Fossati, Luca, Koskinen, Tommi T., Egan, Arika, Cauley, P. Wilson, Cubillos, Patricio. E., Ambily, S., Huang, Chenliang, Lavvas, 5 Panayotis, Fleming, Brian T., Desert, Jean-Michel, Nell, Nicholas, Petit, Pascal, Vidotto, Aline
Ultraviolet observations of Ultra-hot Jupiters (UHJs), exoplanets with temperatures over 2000\,K, provide us with an opportunity to investigate if and how atmospheric escape shapes their upper atmosphere. Near-ultraviolet transit spectroscopy offers
Externí odkaz:
http://arxiv.org/abs/2308.05726
Autor:
Steinrueck, Maria E., Koskinen, Tommi, Lavvas, Panayotis, Parmentier, Vivien, Zieba, Sebastian, Tan, Xianyu, Zhang, Xi, Kreidberg, Laura
Photochemical hazes are expected to form in hot Jupiter atmospheres and may explain the strong scattering slopes and muted spectral features observed in the transmission spectra of many hot Jupiters. Absorption and scattering by photochemical hazes h
Externí odkaz:
http://arxiv.org/abs/2305.09654
HCN is an important constituent in Titan's upper atmosphere, serving as the main coolant in the local energy budget. In this study, we derive the HCN abundance at the altitude range of 960-1400 km, combining the Ion-Neutral Mass Spectrometer data acq
Externí odkaz:
http://hdl.handle.net/10150/621401
http://arizona.openrepository.com/arizona/handle/10150/621401
http://arizona.openrepository.com/arizona/handle/10150/621401
In the near-UV and optical transmission spectrum of the hot Jupiter WASP-121b, recent observations have detected strong absorption features of Mg, Fe, Ca, and H$\alpha$, extending outside of the planet's Roche lobe. Studying these atomic signatures c
Externí odkaz:
http://arxiv.org/abs/2304.07352
Autor:
Arfaux, Anthony, Lavvas, Panayotis
We present a parameterization for the eddy diffusion profile of gas giant exoplanets based on physical phenomena and we explore how the parameterized eddy profile impacts the chemical composition, the thermal structure, the haze microphysics, and the
Externí odkaz:
http://arxiv.org/abs/2304.06314
Autor:
Ben-Jaffel, Lotfi, Ballester, Gilda E., Muñoz, Antonio García, Lavvas, Panayotis, Sing, David K., Sanz-Forcada, Jorge, Cohen, Ofer, Kataria, Tiffany, Henry, Gregory W., Buchhave, Lars, Mikal-Evans, Thomas, Wakeford, Hannah R., López-Morales, Mercedes
Publikováno v:
Nature Astronomy 6, 2022, 141
The magnetosphere of an exoplanet has yet to be unambiguously detected. Investigations of star-planet interaction and neutral atomic hydrogen absorption during transit to detect magnetic fields in hot Jupiters have been inconclusive, and interpretati
Externí odkaz:
http://arxiv.org/abs/2211.05155
Autor:
Arfaux, Anthony, Lavvas, Panayotis
We present a study of photochemical hazes of exoplanet atmospheres based on a self-consistent model including haze microphysics, disequilibrium chemistry, and radiative feedbacks. We derive the haze properties required to match HST observations of te
Externí odkaz:
http://arxiv.org/abs/2206.13134