Zobrazeno 1 - 10
of 344
pro vyhledávání: '"Lavvas, 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:
Lavvas, P., Koskinen, T.
We use a model of aerosol microphysics to investigate the impact of high-altitude photochemical aerosols on the transmission spectra and atmospheric properties of close-in exoplanets, such as HD 209458 b and HD 189733 b. The results depend strongly o
Externí odkaz:
http://hdl.handle.net/10150/626046
http://arizona.openrepository.com/arizona/handle/10150/626046
http://arizona.openrepository.com/arizona/handle/10150/626046
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
Autor:
Wakeford, H. R., Stevenson, K. B., Lewis, N. K., Sing, D. K., López-Morales, M., Marley, M., Kataria, T., Mandell, A., Ballester, G. E., Barstow, J., Ben-Jaffel, L., Bourrier, V., Buchhave, L. A., Ehrenreich, D., Evans, T., García Muñoz, A., Henry, G., Knutson, H., Lavvas, P., Lecavelier des Etangs, A., Nikolov, N., Sanz-Forcada, J.
We present results from the first observations of the Hubble Space Telescope (HST) Panchromatic Comparative Exoplanet Treasury program for WASP-101b, a highly inflated hot Jupiter and one of the community targets proposed for the James Webb Space Tel
Externí odkaz:
http://hdl.handle.net/10150/623095
http://arizona.openrepository.com/arizona/handle/10150/623095
http://arizona.openrepository.com/arizona/handle/10150/623095
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