Results 11 to 20 of about 252 (123)

Reliable Detections of Atmospheres on Rocky Exoplanets with Photometric JWST Phase Curves

The Astrophysical Journal Letters
The prevalence of atmospheres on rocky planets is one of the major questions in exoplanet astronomy, but there are currently no published unambiguous detections of atmospheres on any rocky exoplanets.
Mark Hammond, Claire Marie Guimond, Tim Lichtenberg, Harrison Nicholls, Chloe Fisher, Rafael Luque, Tobias G. Meier, Jake Taylor, Quentin Changeat, Lisa Dang, Hamish C. F. C. Hay, Oliver Herbort, Johanna Teske   +12 more
doaj   +1 more source

JWST/NIRCam Transmission Spectroscopy of the Nearby Sub-Earth GJ 341b

The Astronomical Journal
We present a JWST/Near Infrared Camera (NIRCam) transmission spectrum from 3.9 to 5.0 μ m of the recently validated sub-Earth GJ 341b ( R _P = 0.92 R _⊕ , T _eq = 540 K) orbiting a nearby bright M1 star ( d = 10.4 pc, K _mag = 5.6).
James Kirk, Kevin B. Stevenson, Guangwei Fu, Jacob Lustig-Yaeger, Sarah E. Moran, Sarah Peacock, Munazza K. Alam, Natasha E. Batalha, Katherine A. Bennett, Junellie Gonzalez-Quiles, Mercedes López-Morales, Joshua D. Lothringer, Ryan J. MacDonald, E. M. May, L. C. Mayorga, Zafar Rustamkulov, David K. Sing, Kristin S. Sotzen, Jeff A. Valenti, Hannah R. Wakeford   +19 more
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Disentangling the Hemispheres of Teegarden’s Star b with LIFE

The Astrophysical Journal Letters
Teegarden’s Star is one of the most promising targets for the first observations of LIFE as a nontransiting rocky planet with similar bulk properties to the Earth and a relatively quiescent M dwarf host star.
Ryan Boukrouche, Markus Janson
doaj   +1 more source

Detecting Biosignatures in Nearby Rocky Exoplanets Using High-contrast Imaging and Medium-resolution Spectroscopy with the Extremely Large Telescope

The Astronomical Journal, 2023
In the upcoming decades, one of the primary objectives in exoplanet science is to search for habitable planets and signs of extraterrestrial life in the Universe.
Huihao Zhang, Ji Wang, Michael K. Plummer   +2 more
doaj   +1 more source

Revisiting the Relationship Between Rocky Exoplanet and Stellar Compositions: Reduced Evidence for a Super-Mercury Population

The Astronomical Journal
Planets and the stars they orbit are born from the same cloud of gas and dust, and the primordial compositions of rocky exoplanets have been assumed to have iron and refractory abundance ratios consistent with their host star. To test this assumption, we
Casey L. Brinkman, Alex S. Polanski, Daniel Huber, Lauren M. Weiss, Diana Valencia, Mykhaylo Plotnykov   +5 more
doaj   +1 more source

A Link between Rocky Planet Density and Host Star Chemistry

The Astronomical Journal
Planets and their host stars form from the same cloud of gas and dust, so we assume that their chemical compositions are linked. However, a clear correlation between rocky planet interior properties and host star chemistry remains elusive for planets ...
Aida Behmard, Casey L. Brinkman, Soichiro Hattori, Ryan A. Rubenzahl, Megan Bedell   +4 more
doaj   +1 more source

Machine-learning Inferences of the Interior Structure of Rocky Exoplanets from Bulk Observational Constraints

The Astrophysical Journal Supplement Series, 2023
Characterizing the interiors of rocky exoplanets is important to understand planetary populations and further investigate planetary habitability. New observable constraints and inference techniques have been explored for this purpose.
Yong Zhao, Dongdong Ni, Zibo Liu
doaj   +1 more source

A Gap in the Densities of Small Planets Orbiting M Dwarfs: Rigorous Statistical Confirmation Using the Open-source Code RhoPop

The Planetary Science Journal
Using mass–radius composition models, small planets ( R ≲ 2 R _⊕ ) are typically classified into three types: iron-rich, nominally Earth-like, and those with solid/liquid water and/or atmosphere.
J. G. Schulze, Ji Wang, J. A. Johnson, B. S. Gaudi, R. Rodriguez Martinez, C. T. Unterborn, W. R. Panero   +6 more
doaj   +1 more source

The Impact of Water Clouds on the Prospective Emission Spectrum of Teegarden’s Star b as Observed by LIFE

The Astrophysical Journal
Nontransiting terrestrial planets will be accessible by upcoming observatories of which LIFE is an example. Planet b orbiting Teegarden’s Star is one of the optimal targets for such missions.
Ryan Boukrouche, Rodrigo Caballero, Markus Janson   +2 more
doaj   +1 more source

Near the Runaway: The Climate and Habitability of Teegarden’s Star b

The Astrophysical Journal Letters
Teegarden’s Star b, a nearby terrestrial world receiving an Earth-like instellation, is a prime candidate for next-generation observatories targeting temperate exoplanets in their habitable zones.
Ryan Boukrouche, Rodrigo Caballero, Neil T. Lewis   +2 more
doaj   +1 more source