Results 11 to 20 of about 464 (180)

Early Results from the HUMDRUM Survey: A Small, Earth-mass Planet Orbits TOI-1450A [PDF]

The Astronomical Journal
M-dwarf stars provide us with an ideal opportunity to study nearby small planets. The HUnting for M Dwarf Rocky planets Using MAROON-X (HUMDRUM) survey uses the MAROON-X spectrograph, which is ideally suited to studying these stars, to measure precise ...
Madison Brady, Jacob L. Bean, Andreas Seifahrt, David Kasper, Rafael Luque, Guđmundur Stefánsson, Julian Stürmer, David Charbonneau, Karen A. Collins, John P. Doty, Zahra Essack, Akihiko Fukui, Ferran Grau Horta, Christina Hedges, Coel Hellier, Jon M. Jenkins, Norio Narita, Samuel N. Quinn, Avi Shporer, Richard P. Schwarz, Sara Seager, Keivan G. Stassun, Stephanie Striegel, Cristilyn N. Watkins, Joshua N. Winn, Roberto Zambelli   +25 more
doaj   +2 more sources

Large planets may not form fractionally large moons. [PDF]

Nat Commun, 2022
One of the unique aspects of Earth is that it has a fractionally large Moon, which is thought to have formed from a Moon-forming disk generated by a giant impact.
Nakajima M, Genda H, Asphaug E, Ida S.
europepmc   +2 more sources

Meta-modelling the climate of dry tide locked rocky planets [PDF]

, 2022
Rocky planets hosted by close-in extrasolar systems are likely to be tidally locked in 1:1 spin-orbit resonance, a configuration where they exhibit permanent dayside and nightside.
Auclair-Desrotour, Pierre, Heng, K., Deitrick, R., R. Deitrick, K. Heng, P. Auclair-Desrotour, Auclair-Desrotour, P., Deitrick, Russell, Heng, Kevin   +8 more
core   +1 more source

Vertically Resolved Magma Ocean-Protoatmosphere Evolution: H₂, H₂O, CO₂, CH₄, CO, O₂, and N₂ as Primary Absorbers. [PDF]

J Geophys Res Planets, 2021
The earliest atmospheres of rocky planets originate from extensive volatile release during magma ocean epochs that occur during assembly of the planet.
Lichtenberg T, Bower DJ, Hammond M, Boukrouche R, Sanan P, Tsai SM, Pierrehumbert RT.   +6 more
europepmc   +2 more sources

Superstoichiometric Alloying of H and Close‐Packed Fe‐Ni Metal Under High Pressures: Implications for Hydrogen Storage in Planetary Core

Geophysical Research Letters, Volume 50, Issue 5, 16 March 2023., 2023
Abstract Although high pressure enables alloying between hydrogen and iron, hydrogen‐to‐iron molar ratio (H/Fe) so far found in experiments is mostly limited to 1 in the close‐packed iron metal under high pressure. We report a H/(Fe + Ni) ratio of 1.8 ± 0.1 from (Fe,Ni)Hx (or x ≥ 1.8) quenched from liquid, exceeding the amounts so far reported for ...
Hélène Piet, Andrew Chizmeshya, Bin Chen, Stella Chariton, Eran Greenberg, Vitali Prakapenka, Peter Buseck, Sang‐Heon Shim   +7 more
wiley   +1 more source

Silicate weathering and the habitability of temperate, rocky planets

, 2023
Through the climate-dependence of silicate weathering, the carbonate-silicate cycle is thought to provide a powerful negative feedback on atmospheric CO2 that has maintained clement surface conditions on Earth almost continuously for 4 billion years in ...
Graham, Robert
core   +1 more source

On the application of machine learning in astronomy and astrophysics: A text‐mining‐based scientometric analysis

WIREs Data Mining and Knowledge Discovery, Volume 12, Issue 5, September/October 2022., 2022
This work presents a text‐mining‐based scientometric analysis of the scientific output in the last three decades regarding the use of artificial intelligence and machine learning in the fields of astronomy and astrophysics. Abstract Since the beginning of the 21st century, the fields of astronomy and astrophysics have experienced significant growth at ...
José‐Víctor Rodríguez, Ignacio Rodríguez‐Rodríguez, Wai Lok Woo   +2 more
wiley   +1 more source

INCREASE: An updated model suite to study the INfluence of Cosmic Rays on Exoplanetary AtmoSpherEs

Astronomische Nachrichten, Volume 343, Issue 4, May 2022., 2022
Abstract Exoplanets are as diverse as they are fascinating. They vary from ultrahot Jupiter‐like low‐density planets to presumed gas‐ice‐rock mixture worlds such as GJ 1214b or worlds as LHS 1140b, which features twice the Earth's bulk density. Regarding the great diversity of exoplanetary atmospheres, much remains to be explored.
Konstantin Herbst, John Lee Grenfell, Miriam Sinnhuber, Fabian Wunderlich   +3 more
wiley   +1 more source

Masses for the seven planets in K2-32 and K2-233: Four diverse planets in resonant chain and the first young rocky worlds [PDF]

, 2021
Context. High-precision planetary densities are key pieces of information necessary to derive robust atmospheric properties for extrasolar planets. Measuring precise masses is the most challenging part of this task, especially in multi-planetary systems.
Armstrong, David J., Acuña, L., Brown, David J. A., Dumusque, X., Hojjatpanah, Saeed, Sousa, S. G., Santos, N. C., Nielsen, L. D., Osborn, Hugh, Deleuil, Magali, Mousis, Olivier, Santerne, Alexandre, Barros, Susana C.C., Barrado y Navascués, David, Bayliss, Daniel, Lopez, Théo A, Figueira, P., Udry, Stephane, Adibekyan, V., Lillo-Box, Jorge, Demangeon, O.D.S.   +20 more
core   +1 more source

The harsh environment where exoplanets live

Astronomische Nachrichten, Volume 343, Issue 4, May 2022., 2022
Abstract The X‐ray and Extreme Ultraviolet (XUV) actvity of the Sun has determined important effects on the planets around it. In particular, high doses of X‐rays, flares, and coronal mass ejections (CMEs) combined with masses and sizes of the planets and the shielding action of the planetary magnetic fields have determined the diverse habitability of ...
Ignazio Pillitteri
wiley   +1 more source