Results 111 to 120 of about 1,575 (209)

Distinguishing Oceans of Water from Magma on Mini-Neptune K2-18b

The Astrophysical Journal Letters
Mildly irradiated mini-Neptunes have densities potentially consistent with them hosting substantial liquid-water oceans (“Hycean” planets). The presence of CO _2 and simultaneous absence of ammonia (NH _3 ) in their atmospheres has been proposed as a ...
Oliver Shorttle, Sean Jordan, Harrison Nicholls, Tim Lichtenberg, Dan J. Bower   +4 more
doaj   +1 more source

The Metallicity and Carbon-to-oxygen Ratio of the Ultrahot Jupiter WASP-76b from Gemini-S/IGRINS

The Astronomical Journal
Measurements of the carbon-to-oxygen (C/O) ratios of exoplanet atmospheres can reveal details about their formation and evolution. Recently, high-resolution cross-correlation analysis has emerged as a method of precisely constraining the C/O ratios of ...
Megan Weiner Mansfield, Michael R. Line, Joost P. Wardenier, Matteo Brogi, Jacob L. Bean, Hayley Beltz, Peter Smith, Joseph A. Zalesky, Natasha Batalha, Eliza M.-R. Kempton, Benjamin T. Montet, James E. Owen, Peter Plavchan, Emily Rauscher   +13 more
doaj   +1 more source

Volatile-bearing mineral atmospheres of hot rocky exoplanets as probes of interior state and composition

The atmospheres of hot rocky exoplanets (HREs), should they persist, are products of interactions with underlying magma oceans. Spectra collected by the James Webb Space Telescope (JWST) hint at a CO/CO$_2$-rich atmosphere on the HRE 55 Cancri e, indicative of such a process.
Seidler, Fabian L., Sossi, Paolo A., Bower, Dan J., Demory, Brice-Olivier   +3 more
openaire   +2 more sources

Global Chemical Transport on Hot Jupiters: Insights from the 2D VULCAN Photochemical Model

The Astrophysical Journal
The atmospheric dynamics of tidally locked hot Jupiters is characterized by strong equatorial winds. Understanding the interaction between global circulation and chemistry is crucial in atmospheric studies and interpreting observations.
Shang-Min Tsai, Vivien Parmentier, João M. Mendonça, Xianyu Tan, Russell Deitrick, Mark Hammond, Arjun B. Savel, Xi Zhang, Raymond T. Pierrehumbert, Edward W. Schwieterman   +9 more
doaj   +1 more source

The effect of a small amount of hydrogen in the atmosphere of ultrahot magma-ocean planets: atmospheric composition and escape

, 2023
Here we investigate how small amounts of hydrogen (much smaller than the mass of the exoplanet) above a magma ocean on a rocky exoplanet may modify the atmospheric chemistry and atmospheric escape.We use a chemical model of a magma ocean coupled to a gas
Charnoz, Sébastien, Sossi, Paolo, Lagage, Pierre-Olivier, Falco, Aurélien, Tremblin, Pascal, Caracas, Razvan   +5 more
core  

A Photochemical Phosphorus-Hydrogen-Oxygen Network for Hydrogen-dominated Exoplanet Atmospheres

The Astrophysical Journal
Due to the detection of phosphine (PH _3 ) in the solar system gas giants Jupiter and Saturn, PH _3 has long been suggested to be detectable in exosolar substellar atmospheres too.
Elspeth K. H. Lee, Shang-Min Tsai, Julianne I. Moses, John M. C. Plane, Channon Visscher, Stephen J. Klippenstein   +5 more
doaj   +1 more source

ARIEL – Atmospheric Remote-Sensing Infrared Exoplanet Large-survey

, 2016
International audienceThe Atmospheric Remote-Sensing Infrared Exoplanet Large-survey (ARIEL) is one of the three candidate missions selected by the European Space Agency (ESA) for its next medium-class science mission due for launch in 2026.
Hartogh, Paul, Wolkenberg, Paulina, Leconte, J., Micela, Giusi, Turrini, Diego, Ollivier, Marc, Pilbratt, Göran, Vandenbussche, Bart, Tinetti, Giovanna, Drossart, Pierre, Eccleston, Paul, Ariel Consortium, Ariel Esa Study Team, Puig, Ludovic   +12 more
core   +2 more sources

NASA’s Pandora SmallSat Mission: Simulated Modeling and Retrieval of Near-infrared Exoplanet Transmission Spectra

The Astronomical Journal
Pandora is a SmallSat mission dedicated to understanding exoplanets and their host stars by disentangling the impact of stellar heterogeneity on exoplanet transmission spectra.
Yoav Rotman, Peter McGill, Luis Welbanks, Benjamin V. Rackham, Aishwarya Iyer, Dániel Apai, Michael R. Line, Elisa V. Quintana, Jessie L. Dotson, Knicole D. Colón, Thomas Barclay, Christina Hedges, Jason F. Rowe, Emily A. Gilbert, Brett M. Morris, Jessie L. Christiansen, Trevor O. Foote, Aylin García Soto, Thomas P. Greene, Kelsey Hoffman, Benjamin J. Hord, Aurora Y. Kesseli, Veselin B. Kostov, Megan Weiner Mansfield, Lindsey S. Wiser   +24 more
doaj   +1 more source

The Solubility of N2 in High-pressure Ice and Its Consequent Outgassing Limitations in Water Worlds

The Astrophysical Journal
Exoplanets with a few percent water mass fraction may host a high-pressure ice layer that separates the atmosphere from the interior. We investigate the role played by this layer in the transport of N _2 between the interior and the atmosphere.
Amit Levi, Ref Bari, Sukrit Ranjan, Dimitar Sasselov   +3 more
doaj   +1 more source

The GAPS programme at TNG. LXI. Atmospheric parameters and elemental abundances of TESS young exoplanet host stars [PDF]

The study of exoplanets at different evolutionary stages can shed light on their formation, migration, and evolution. The determination of exoplanet properties depends on the properties of their host stars.
R. Cosentino, SOZZETTI, Alessandro, V. D'Orazi, A. F. M. Fiorenzano, BONOMO, ALDO STEFANO, DESIDERA, Silvano, Filomeno, S., Harutyunyan, A., Damasso, M., D'ORAZI, VALENTINA, A. Harutyunyan, T. Zingales, BIAZZO, Katia, Mantovan, G., Cosentino, R., ANTONIUCCI, Simone, V. D’Orazi, Zingales, T., S. Antoniucci, Biazzo, K., Mancini, L., M. Baratella, Andreuzzi, G., Bonomo, A. S., SCANDARIATO, GAETANO, BENATTI, Serena, S. Fonte, S. Messina, M. Damasso, D. Nardiello, Baratella, M., Nardiello, D., BIGNAMINI, ANDREA, Messina, S., S. Filomeno, ANDREUZZI, Gloria, Antoniucci, S., Fiorenzano, A. F. M., Benatti, S., D. Turrini, Carleo, I., K. Biazzo, G. Andreuzzi, S. Desidera, L. Cabona, A. Bignamini, FONTE, SERGIO, Fonte, S., Cabona, L., R. Claudi, Turrini, D., L. Mancini, C. Knapic, TURRINI, Diego, CLAUDI, Riccardo, S. Benatti, D. Polychroni, Polychroni, D., Scandariato, G., Knapic, C., D'Orazi, V., Desidera, S., A. Sozzetti, Bignamini, A., DAMASSO, Mario, Claudi, R., KNAPIC, Cristina, MESSINA, Sergio, G. Mantovan, Sozzetti, A., G. Scandariato, Malavolta, L., A. S. Bonomo, L. Malavolta, COSENTINO, Rosario, I. Carleo   +75 more
core   +1 more source