Zobrazeno 1 - 10
of 107
pro vyhledávání: '"Panayotis Lavvas"'
Autor:
A. G. Sreejith, Kevin France, Luca Fossati, Tommi T. Koskinen, Arika Egan, P. Wilson Cauley, Patricio. E. Cubillos, S. Ambily, Chenliang Huang, Panayotis Lavvas, Brian T. Fleming, Jean-Michel Desert, Nicholas Nell, Pascal Petit, Aline Vidotto
Publikováno v:
The Astrophysical Journal Letters, Vol 954, Iss 1, p L23 (2023)
Ultraviolet observations of ultrahot Jupiters, 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 a unique
Externí odkaz:
https://doaj.org/article/d7269a2ca464497ab53813b0f3d3825e
Publikováno v:
The Astrophysical Journal, Vol 951, Iss 2, p 123 (2023)
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 α , extending outside of the planet’s Roche lobe. Studying these atomic signatures can
Externí odkaz:
https://doaj.org/article/33f26e587a0848288b87670cbf326f19
Autor:
Maria E. Steinrueck, Tommi Koskinen, Panayotis Lavvas, Vivien Parmentier, Sebastian Zieba, Xianyu Tan, Xi Zhang, Laura Kreidberg
Publikováno v:
The Astrophysical Journal, Vol 951, Iss 2, p 117 (2023)
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:
https://doaj.org/article/1981e7d8f1894596953acb2460d31f2f
Autor:
Anthony Arfaux, Panayotis Lavvas
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 522:2525-2542
We present a parametrization for the eddy diffusion profile of gas giant exoplanets based on physical phenomena and we explore how the parametrized eddy profile impacts the chemical composition, the thermal structure, the haze microphysics, and the t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dc88617afd7ddf871c56400599fe06cc
https://doi.org/10.1093/mnras/stad1135
https://doi.org/10.1093/mnras/stad1135
Autor:
Panayotis Lavvas, Anthony Arfaux
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 515:4753-4779
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fc60250edda59d9078d633e3079c3f14
https://doi.org/10.1093/mnras/stac1772
https://doi.org/10.1093/mnras/stac1772
Autor:
Ahmad Mortada, Sophie Carles, Sándor Demes, Baptiste Joalland, François Lique, Abdessamad Benidar, Panayotis Lavvas, Ludovic Biennier
Publikováno v:
ACS Earth and Space Chemistry
ACS Earth and Space Chemistry, 2022, 6 (5), pp.1227-1238. ⟨10.1021/acsearthspacechem.1c00347⟩
ACS Earth and Space Chemistry, 2022, 6 (5), pp.1227-1238. ⟨10.1021/acsearthspacechem.1c00347⟩
International audience; The photoionization of N2 plays a key role in initiating the formation of complex organic molecules in the nitrogen-rich atmosphere of Saturn’s largest moon, Titan. To date, only a handful of laboratory studies have explored
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e9a25ac1864b7817d955a9bacd04303c
https://doi.org/10.1021/acsearthspacechem.1c00347
https://doi.org/10.1021/acsearthspacechem.1c00347
Autor:
Lotfi Ben-Jaffel, Gilda E. Ballester, Antonio García Muñoz, Panayotis Lavvas, David K. Sing, Jorge Sanz-Forcada, Ofer Cohen, Tiffany Kataria, Gregory W. Henry, Lars Buchhave, Thomas Mikal-Evans, Hannah R. Wakeford, Mercedes López-Morales
Publikováno v:
Nature Astronomy
Nature Astronomy, 2022, 6, pp.141-153. ⟨10.1038/s41550-021-01505-x⟩
Nature Astronomy, 2022, 6, pp.141-153. ⟨10.1038/s41550-021-01505-x⟩
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7d6f1fec2d4070aa086952450662281b
http://arxiv.org/abs/2211.05155
http://arxiv.org/abs/2211.05155
Autor:
Panayotis Lavvas, Tommi Koskinen
The Cassini/UVIS observations of Titan’s atmosphere extend from 2005 to 2017 providing a broad spatial and temporal view of the upper atmosphere including the seasonal change from Southern summer at the Cassini-Huygens arrival in 2005, to equinox (
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c71e3f1036e7fb982becefa11332ca97
https://doi.org/10.5194/epsc2022-447
https://doi.org/10.5194/epsc2022-447
Autor:
Anthony Arfaux, Panayotis Lavvas
The complexity of the phenomena taking place in exoplanet atmospheres is challenging to simulate and choices have to be done to simplify the problem. The choice of using a one dimensional atmospheric model is potentially the most resource-saving one,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3e53b6d59b95f1022b79574dee15287f
https://doi.org/10.5194/epsc2022-328
https://doi.org/10.5194/epsc2022-328
Publikováno v:
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society: Letters
Monthly Notices of the Royal Astronomical Society: Letters, Oxford Journals, 2021, pp.2783-2799. ⟨10.1093/mnras/stab1053⟩
Monthly Notices of the Royal Astronomical Society: Letters
Monthly Notices of the Royal Astronomical Society: Letters, Oxford Journals, 2021, pp.2783-2799. ⟨10.1093/mnras/stab1053⟩
Photochemical hazes have been suggested as candidate for the high-altitude aerosols observed in the transmission spectra of many hot Jupiters. We present 3D simulations of the hot Jupiter HD 189733b to study how photochemical hazes are transported by
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c831d5fd2ce135f92aaab8188966314b
https://doi.org/10.1093/mnras/stab1053
https://doi.org/10.1093/mnras/stab1053