Results 41 to 50 of about 186,798 (170)

Superhabitable Planets Around Mid‐Type K Dwarf Stars Enhance Simulated JWST Observability and Surface Habitability

Astronomische Nachrichten, Volume 346, Issue 2, February 2025.
ABSTRACT In our search for life beyond the Solar System, certain planetary bodies may be more conducive to life than Earth. However, the observability of these “superhabitable” (SH) planets in the habitable zones around K dwarf stars has not been fully modeled. This study addresses this gap by modeling the atmospheres of SH exoplanets.
Iva Vilović, Jayesh Goyal, René Heller, Fanny Marie von Schauenburg   +3 more
wiley   +1 more source

The Radiative Effects of Photochemical Hazes on the Atmospheric Circulation and Phase Curves of Sub-Neptunes

The Astrophysical Journal
Measuring the atmospheric composition of hazy sub-Neptunes like GJ 1214b through transmission spectroscopy is difficult because of the degeneracy between mean molecular weight (MMW) and haziness.
Maria E. Steinrueck, Vivien Parmentier, Laura Kreidberg, Peter Gao, Eliza M.-R. Kempton, Michael Zhang, Kevin B. Stevenson, Isaac Malsky, Michael T. Roman, Emily Rauscher, Matej Malik, Roxana Lupu, Tiffany Kataria, Anjali A. A. Piette, Jacob L. Bean, Matthew C. Nixon   +15 more
doaj   +1 more source

Highly Significant Detection of X‐Ray Polarization in Sco X‐1 and Its Polarization Angle Misaligned With the Direction of the Radio Jet

Astronomische Nachrichten, Volume 346, Issue 1, January 2025.
ABSTRACT The Imaging X‐ray Polarimetry Explorer has successfully measured the X‐ray polarization of Scorpius X‐1, the brightest Z‐source, in the 2–8 keV energy band. The degree of polarization was found to be ∼1.0%$$ \sim 1.0\% $$ with a polarization angle of ∼8$$ \sim 8 $$°. This measurement was conducted simultaneously with NICER, NuSTAR, and Insight‐
Fabio La Monaca, on behalf of IXPE Science Team   +1 more
wiley   +1 more source

Confirming the Warm and Dense Sub-Saturn TIC 139270665 b with the Automated Planet Finder and Unistellar Citizen Science Network

The Astronomical Journal
We report the discovery and confirmation of the Transiting Exoplanet Survey Satellite (TESS) single-transit, warm and dense sub-Saturn, TIC 139270665 b. This planet is unusually dense for its size: with a bulk density of 2.13 g cm ^−3 (0.645 R _J , 0.463
Daniel O’Conner Peluso, Paul A. Dalba, Duncan Wright, Thomas M. Esposito, Lauren A. Sgro, Ian C. Weaver, Franck Marchis, Diana Dragomir, Steven Villanueva Jr., Benjamin Fulton, Howard Isaacson, Arvind F. Gupta, Thomas Lee Jacobs, Daryll M. LaCourse, Robert Gagliano, Martti H. Kristiansen, Mark Omohundro, Hans M. Schwengeler, Ivan A. Terentev, Andrew Vanderburg, Ananya Balakrishnan, Divya Bhamidipati, Marco Hovland, Serina Jain, Nathan Jay, Hanna Johnson, Aditya Kapur, Jonah Morgan, Josephine Oesterer, Richard Purev, Dean Ramos, Christopher Seo, Vibha Sriramkumar, Naina Srivastava, Astha Verma, Olivia Woo, Steven Adkinson, Keiichi Fukui, Patrice Girard, Tateki Goto, Bruno Guillet, Des Janke, Andre Katterfeld, Rachel Knight, David Koster, Ryuichi Kukita, Eric Lawson, Liouba Leroux, Niniane Leroux, Chelsey Logan, Margaret A. Loose, Nicola Meneghelli, Eric Oulevey, Bruce Parker, Stephen Price, Michael Primm, Justus Randolph, Robert Savonnet, Masao Shimizu, Petri Tikkanen, Stefan Will, Neil Yoblonsky, Wai-Chun Yue   +62 more
doaj   +1 more source

The Process We Call Earth: Relationships Between Dynamic Feedbacks and the Search for Gaiasignatures in a New Paradigm of Earthlikeness

Perspectives of Earth and Space Scientists, Volume 5, Issue 1, December 2024.
Abstract Standard notions of an “Earthlike” planet rely solely on physical and material properties, like planetary mass, radius, and surface temperature. Here, we introduce a novel, relational perspective on what defines “Earthlikeness.” In our process‐based framework, rocky planets are local pockets of free energy that have the potential to drive the ...
Michael L. Wong, Marissa Duckett, Emilia S. Hernandez, Vahab Rajaei, Kayla J. Smith   +4 more
wiley   +1 more source

The Narrow Formation Pathway of Hot Saturns: Constraints on Initial Planetary Properties

The Astrophysical Journal
The observed exoplanet population exhibits a scarcity of short-period Saturn-mass planets, a phenomenon referred to as the “hot-Saturn desert.” This observational scarcity can be utilized to validate the theories regarding the formation and evolution of ...
Minghao Xie, Sheng Jin, Dong-Hong Wu
doaj   +1 more source

From Meteorite to Life's Building Blocks: A possible Electrochemical Pathway to Amino Acids and Peptide Bonds

Chemistry – A European Journal, Volume 30, Issue 57, October 11, 2024.
This study investigates the ability of the carbonaceous meteorite CV3 Allende to act as a catalyst in electrochemical interactions, triggering electrocatalytic reactions resulting in nitrogen (N2) fixation and conversion to ammonia. Additionally, the evolution of crucial compounds such as H2, CN− and sulfur/H2S was observed, along with the detection of
Lucas Fernandez, Farzaneh Yari, Günter Hesser, Wolfgang Schöfberger   +3 more
wiley   +1 more source

Microlensing search for extra solar planets [PDF]

, 2015
Gravitational microlensing may be used to probe distant stars for planetary companions. The presence of a planet in the vicinity of a star acting as the lens may cause a short lived anomaly in the observed lightcurve of the lensing event.
Tsapras, Yiannis
core   +2 more sources

Detection and quantification of organosulfur species in the Tagish Lake Meteorite by highly sensitive LC‐MS

Meteoritics &Planetary Science, Volume 59, Issue 9, Page 2241-2259, September 2024.
Abstract We analyzed the methanol extracts of six pristine specimens of the Tagish Lake meteorite (TL1, TL4, TL5A, TL6, TL7, and TL10a) and heated and unheated samples of Allende using high‐performance liquid chromatography coupled with high‐resolution, accurate mass–mass spectrometry (HPLC‐HRAM‐MS).
N. Randazzo, R. W. Hilts, M. C. Holt, C. D. K. Herd, B. Reiz, R. M. Whittal   +5 more
wiley   +1 more source

A JWST Transit of a Jupiter Analog. I. Constraints on the Oblateness of Kepler-167 e

The Astronomical Journal
In 2024 October, JWST observed a transit of Kepler-167 e, a Jupiter-analog planet on a 1000+ day orbit. These observations, recorded over a long baseline of nearly 60 hr, were designed to search for signatures of planetary oblateness and/or exomoons ...
Ben Cassese, David Kipping, Quentin Changeat, Daniel A. Yahalomi, Justin Vega, Yayaati Chachan, Billy Edwards, Alex Teachey   +7 more
doaj   +1 more source