Results 111 to 120 of about 15,445 (215)

Magma Ocean Interactions Can Explain JWST Observations of the Sub-Neptune TOI-270 d

The Astrophysical Journal
Sub-Neptunes with substantial atmospheres may possess magma oceans in contact with the overlying gas, with chemical interactions between the atmosphere and magma playing an important role in shaping atmospheric composition.
Matthew C. Nixon, R. Sander Somers, Arjun B. Savel, Jegug Ih, Eliza M.-R. Kempton, Edward D. Young, Hilke E. Schlichting, Tim Lichtenberg, Luis Welbanks, William Misener, Anjali A. A. Piette, Nicholas F. Wogan   +11 more
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How Internal Structure Shapes the Metallicity of Giant Exoplanets

Submitted to A& ...
Peerani, Lorenzo, Howard, Saburo, Helled, Ravit   +2 more
openaire   +2 more sources

Where Are the Water Worlds? Identifying Exo-water-worlds Using Models of Planet Formation and Atmospheric Evolution

The Astrophysical Journal
Planet formation models suggest that the small exoplanets that migrate from beyond the snowline of the protoplanetary disk likely contain water-ice-rich cores (∼50% by mass), also known as water worlds.
Aritra Chakrabarty, Gijs D. Mulders
doaj   +1 more source

The Importance of Optical Wavelength Data on Atmospheric Retrievals of Exoplanet Transmission Spectra

The Astronomical Journal
Exoplanet transmission spectra provide rich information about the chemical composition, clouds, and temperature structure of exoplanet atmospheres. Most exoplanet transmission spectra only span infrared wavelengths (≳1 μ m), which can preclude crucial ...
Charlotte Fairman, Hannah R. Wakeford, Ryan J. MacDonald   +2 more
doaj   +1 more source

Helium Depletion in Escaping Atmospheres of Sub-Neptunes: A Signature of Primary-to-secondary Transition

The Astrophysical Journal
Short-period sub-Neptunes are common in extrasolar systems. These sub-Neptunes are generally thought to have primary atmospheres of protoplanetary-disk gas origin.
Issei Kobayashi, Hiroyuki Kurokawa, Laura Schaefer, Satoshi Okuzumi   +3 more
doaj   +1 more source

From Underground Oceans to Continents: A Glimpse into the Water Inventory on Rocky Planets Using Host Star Abundances

The Astrophysical Journal
The amount of surface water is thought to be critical for a planet’s climate stability and thus habitability. However, the probability that a rocky planet may exhibit surface water at any point in its evolution is dependent on multiple factors, such as ...
Kiersten M. Boley, Wendy R. Panero, Francesca Miozzi, Ashika Capirala, Johanna K. Teske   +4 more
doaj   +1 more source

Exoplanet Diversity in the Era of Space-based Direct Imaging Missions

, 2018
This whitepaper discusses the diversity of exoplanets that could be detected by future observations, so that comparative exoplanetology can be performed in the upcoming era of large space-based flagship missions.
Adibekyan, Vardan, Airapetian, Vladimir, Anbar, Ariel, Arney, Giada, Batalha, Natalie M., Beckwith, Steven, Belikov, Rus, Charnay, Benjamin, Curry, Shannon, Danchi, William, Del Genio, Anthony D., Desch, Steve, Domagal-Goldman, Shawn, Dong, Chuanfei, Ford, Eric B., Fortney, Jonathan, France, Kevin, Gelino, Dawn, Guzewich, Scott D., Haqq-Misra, Jacob, Harman, Chester E., Hartnett, Hilairy E., Hasegawa, Yasuhiro, Hebrard, Eric, Henning, Wade, Hicks, Brian, Hinkel, Natalie, Izenberg, Noam, Jensen, Adam, Jontof-Hutter, Daniel, Kane, Stephen R., Kohler, Erika, Kopparapu, Ravi, Lisse, Carey M., Lopez, Eric D., Lyra, Wladimir, Mandell, Avi, Mandt, Kathleen E., Marchis, Franck, Minniti, Dante, Moore, Bill, Mulders, Gijs D., Nixon, Conor, Pierrehumbert, Ray, Rau, Gioia, Renaud, Joe, Rinehart, Stephen, Roberge, Aki, Scharf, Caleb, Schwieterman, Edward W., Shock, Everett, Stark, Chris, Teal, Dillon, Teske, Johanna, Trainer, Melissa, Way, Michael, Wolf, Eric T., Young, Patrick   +57 more
core  

Stellar Spectroscopy during Exoplanet Transits: Dissecting fine structure across stellar surfaces

, 2014
Differential spectroscopy during exoplanet transits permits to reconstruct spectra of small stellar surface portions that successively become hidden behind the planet. The center-to-limb behavior of stellar line shapes, asymmetries and wavelength shifts will enable detailed tests of 3-dimensional hydrodynamic models of stellar atmospheres, such that ...
Dravins, Dainis, Ludwig, Hans-Günter, Dahlén, Erik, Pazira, Hiva   +3 more
openaire   +2 more sources

Exoplanet Technosignature Detection of Orbital Terraforming Mirror Structures

The search for technosignatures no longer rests solely on radio signals. Modern wide-field surveys now make it possible to detect engineered structures at interstellar distances. Among the most promising of these are space-based mirrors, as large reflective constructs designed to manipulate planetary climates by increasing or reducing incoming sunlight.
openaire   +1 more source

JWST/NIRISS Reveals the Water-rich “Steam World” Atmosphere of GJ 9827 d

The Astrophysical Journal Letters
With sizable volatile envelopes but smaller radii than the solar system ice giants, sub-Neptunes have been revealed as one of the most common types of planet in the galaxy. While the spectroscopic characterization of larger sub-Neptunes (2.5–4 R _⊕ ) has
Caroline Piaulet-Ghorayeb, Björn Benneke, Michael Radica, Eshan Raul, Louis-Philippe Coulombe, Eva-Maria Ahrer, Daria Kubyshkina, Ward S. Howard, Joshua Krissansen-Totton, Ryan J. MacDonald, Pierre-Alexis Roy, Amy Louca, Duncan Christie, Marylou Fournier-Tondreau, Romain Allart, Yamila Miguel, Hilke E. Schlichting, Luis Welbanks, Charles Cadieux, Caroline Dorn, Thomas M. Evans-Soma, Jonathan J. Fortney, Raymond Pierrehumbert, David Lafrenière, Lorena Acuña, Thaddeus Komacek, Hamish Innes, Thomas G. Beatty, Ryan Cloutier, René Doyon, Anna Gagnebin, Cyril Gapp, Heather A. Knutson   +32 more
doaj   +1 more source