Results 91 to 100 of about 8,946 (200)

The influence of forward-scattered light in transmission measurements of (exo)planetary atmospheres

, 2012
[Abridged] The transmission of light through a planetary atmosphere can be studied as a function of altitude and wavelength using stellar or solar occultations, giving often unique constraints on the atmospheric composition.
de Kok, R. J., Stam, D. M.
core   +1 more source

A Metal-poor Atmosphere with a Hot Interior for a Young Sub-Neptune Progenitor: JWST/NIRSpec Transmission Spectrum of V1298 Tau b

The Astronomical Journal
We present the JWST/NIRSpec G395H transmission spectrum of the young (10–30 Myr) transiting planet V1298 Tau b (9.85 ± 0.35 R _⊕ , T _eq  = 670 K). Combined Hubble Space Telescope and JWST observations reveal a haze-free, H/He-dominated atmosphere with a
Saugata Barat, Jean-Michel Désert, Sagnick Mukherjee, Jayesh M. Goyal, Qiao Xue, Yui Kawashima, Allona Vazan, William Misener, Hilke E. Schlichting, Jonathan J. Fortney, Jacob L. Bean, Swaroop Avarsekar, Gregory W. Henry, Robin Baeyens, Michael R. Line, John H. Livingston, Trevor David, Erik A. Petigura, James T. Sikora, Hinna Shivkumar, Adina D. Feinstein, Antonija Oklopčić   +21 more
doaj   +1 more source

Bistability, Oscillations, and Multistability on Hycean Planets

The Astrophysical Journal
Hycean planets are hypothetical exoplanets characterized by H _2 O oceans and H _2 -rich atmospheres. These planets are high-priority targets for biosignature searches, as they combine abundant surface liquid water with easy-to-characterize H _2 -rich ...
Yichen Gao, Daniel D. B. Koll, Feng Ding
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  

The mutual influence of disequilibrium composition and temperature in exoplanet atmospheres

Astronomy & Astrophysics
Astronomical observations have provided an extensive body of evidence for the existence of disequilibrium chemistry in many exoplanet atmospheres, and this departure from a chemical equilibrium composition may have an impact on the temperature of the atmosphere itself.
openaire   +3 more sources

The JWST Rocky Worlds DDT Program Reveals GJ 3929b to Likely Be a Bare Rock

The Astrophysical Journal Letters
We report first results from the JWST Rocky Worlds Director’s Discretionary Time program. Two secondary eclipses of the terrestrial exoplanet GJ 3929b were recently observed using MIRI photometric imaging at 15 μ m.
Qiao Xue, Michael Zhang, Brandon Park Coy, Madison Brady, Xuan Ji, Jacob L. Bean, Michael Radica, Andreas Seifahrt, Julian Stürmer, Rafael Luque, Ritvik Basant, Nina Brown, Tanya Das, David Kasper, Caroline Piaulet-Ghorayeb, Eliza M.-R. Kempton, Edwin Kite   +16 more
doaj   +1 more source

Characterizing Exoplanet Habitability

A habitable exoplanet is a world that can maintain stable liquid water on its surface. Techniques and approaches to characterizing such worlds are essential, as performing a census of Earth-like planets that may or may not have life will inform our ...
Robinson, Tyler D.
core   +1 more source

Irradiated Atmospheres. IV. Effect of Mixing Heat Flux on Chemistry

The Astrophysical Journal
Vertical mixing disrupts the thermochemical equilibrium and introduces additional heat flux that alters exoplanetary atmospheric temperatures. We investigate how this mixing-induced heat flux affects atmospheric chemistry.
Zhen-Tai Zhang, Wei Zhong, Wei Wang, Jianheng Guo, Xianyu Tan, Bo Ma, Ruyi Wei, Cong Yu   +7 more
doaj   +1 more source

Sulfur Dioxide and Other Molecular Species in the Atmosphere of the Sub-Neptune GJ 3470 b

The Astrophysical Journal Letters
We report observations of the atmospheric transmission spectrum of the sub-Neptune exoplanet GJ 3470 b taken using the Near-Infrared Camera on JWST.
Thomas G. Beatty, Luis Welbanks, Everett Schlawin, Taylor J. Bell, Michael R. Line, Matthew Murphy, Isaac Edelman, Thomas P. Greene, Jonathan J. Fortney, Gregory W. Henry, Sagnick Mukherjee, Kazumasa Ohno, Vivien Parmentier, Emily Rauscher, Lindsey S. Wiser, Anastasia Triantafillides   +15 more
doaj   +1 more source

Early Accretion of Large Amounts of Solids for Directly Imaged Exoplanets

The Astrophysical Journal
As the number of planetary-mass objects (PMOs; ⪅13 M _Jupiter ) at wider separation (⪆10 au) grows, there is emerging evidence that they form differently from their higher-mass brown dwarf counterparts.
Ji Wang
doaj   +1 more source