Results 51 to 60 of about 464 (180)

LHS 475 b: A Potential Venus Analog Orbiting a Nearby M Dwarf

The Astronomical Journal
Based on photometric observations by TESS, we present the discovery of a potential Venus analog transiting LHS 475, an M3 dwarf located 12.5 pc from the Sun. The mass of the star is 0.274 ± 0.015 M _☉ .
Kristo Ment, David Charbonneau, Jonathan Irwin, Jennifer G. Winters, Emily Pass, Avi Shporer, Karen A. Collins, Kevin I. Collins, Eric L. N. Jensen, Richard P. Schwarz, Keith Horne, Zahra Essack, Veselin B. Kostov, Michelle Kunimoto, Alan Levine, Sara Seager, Roland Vanderspek, Joshua N. Winn   +17 more
doaj   +1 more source

Company for the Ultra-high Density, Ultra-short Period Sub-Earth GJ 367 b: Discovery of Two Additional Low-mass Planets at 11.5 and 34 Days

The Astrophysical Journal Letters, 2023
GJ 367 is a bright ( V ≈ 10.2) M1 V star that has been recently found to host a transiting ultra-short period sub-Earth on a 7.7 hr orbit. With the aim of improving the planetary mass and radius and unveiling the inner architecture of the system, we ...
Elisa Goffo, Davide Gandolfi, Jo Ann Egger, Alexander J. Mustill, Simon H. Albrecht, Teruyuki Hirano, Oleg Kochukhov, Nicola Astudillo-Defru, Oscar Barragan, Luisa M. Serrano, Artie P. Hatzes, Yann Alibert, Eike Guenther, Fei Dai, Kristine W. F. Lam, Szilárd Csizmadia, Alexis M. S. Smith, Luca Fossati, Rafael Luque, Florian Rodler, Mark L. Winther, Jakob L. Rørsted, Javier Alarcon, Xavier Bonfils, William D. Cochran, Hans J. Deeg, Jon M. Jenkins, Judith Korth, John H. Livingston, Annabella Meech, Felipe Murgas, Jaume Orell-Miquel, Hannah L. M. Osborne, Enric Palle, Carina M. Persson, Seth Redfield, George R. Ricker, Sara Seager, Roland Vanderspek, Vincent Van Eylen, Joshua N. Winn   +40 more
doaj   +1 more source

Earth's Alfvén Wings Driven by the April 2023 Coronal Mass Ejection

Geophysical Research Letters, Volume 51, Issue 14, 28 July 2024.
Abstract We report a rare regime of Earth's magnetosphere interaction with sub‐Alfvénic solar wind in which the windsock‐like magnetosphere transforms into one with Alfvén wings. In the magnetic cloud of a Coronal Mass Ejection (CME) on 24 April 2023, NASA's Magnetospheric Multiscale mission distinguishes the following features: (a) unshocked and ...
Li‐Jen Chen, Daniel Gershman, Brandon Burkholder, Yuxi Chen, Menelaos Sarantos, Lan Jian, James Drake, Chuanfei Dong, Harsha Gurram, Jason Shuster, Daniel B. Graham, Olivier Le Contel, Steven J. Schwartz, Stephen Fuselier, Hadi Madanian, Craig Pollock, Haoming Liang, Matthew Argall, Richard E. Denton, Rachel Rice, Jason Beedle, Kevin Genestreti, Akhtar Ardakani, Adam Stanier, Ari Le, Jonathan Ng, Naoki Bessho, Megha Pandya, Victoria Wilder, Christine Gabrielse, Ian Cohen, Hanying Wei, Christopher T. Russell, Robert Ergun, Roy Torbert, James Burch   +35 more
wiley   +1 more source

Direct Imaging and Spectroscopy of Extrasolar Planets

, 2023
Direct imaging and spectroscopy is the likely means by which we will someday identify, confirm, and characterize an Earth-like planet around a nearby Sun-like star.
Lagrange, Anne-Marie, Biller, Beth, De Rosa, Robert, Bonnefoy, Mickael, Currie, Thayne, Guyon, Olivier, Marois, Christian, Nielsen, Eric   +7 more
core  

From Earths to Super-Earths: Five New Small Planets Transiting M Dwarf Stars

The Astronomical Journal
Earth-sized planets transiting M dwarf stars present one of the best opportunities with current facilities for studying the atmospheric and bulk compositions of terrestrial worlds. Here, we statistically validate five new transiting Earth and super-Earth
Jonathan Gomez Barrientos, Heather A. Knutson, Morgan Saidel, Michael Greklek-McKeon, W. Garrett Levine, Nicholas Saunders, Howard Isaacson, Renyu Hu, Karen A. Collins, David R. Ciardi, Polina A. Budnikova, Dmitry V. Cheryasov, Samuel W. Yee, Diogo Souto, Aida Behmard, Akihiko Fukui, Avi Shporer, Akanksha Khandelwal, Bob Massey, Brice-Oliver Demory, Catherine A. Clark, Chris Stockdale, Emily A. Gilbert, Enric Palle, Francis P. Wilkin, Felipe Murgas, Francis Zong Lang, Ilse Plauchu-Frayn, Jessie L. Christiansen, Jon M. Jenkins, Joseph D. Twicken, Keith Horne, Michaël Gillon, Monika Lendl, Michael B. Lund, Norio Narita, Pam Rowden, Ramotholo Sefako, Richard P. Schwarz, Steven Giacalone, Urs Schroffenegger, Yilen Gómez Maqueo Chew   +41 more
doaj   +1 more source

Mitigating Worst-case Exozodiacal Dust Structure in High-contrast Images of Earth-like Exoplanets

The Astronomical Journal, 2023
Detecting Earth-like exoplanets in direct images of nearby Sun-like systems brings a unique set of challenges that must be addressed in the early phases of designing a space-based direct imaging mission.
Miles H. Currie, Christopher C. Stark, Jens Kammerer, Roser Juanola-Parramon, Victoria S. Meadows   +4 more
doaj   +1 more source

Electrical Conductivity of Dense MgSiO3 Melt Under Static Compression

Geophysical Research Letters, Volume 51, Issue 12, 28 June 2024.
Abstract The magnetic fields of terrestrial planets are created by core convection. Molten silicate mantles could also generate magnetic fields through their convective motion, known as a silicate dynamo. Recent computational studies have suggested that silicate melts may exhibit high electrical conductivity (EC) at temperatures above 4000 K due to ...
Yoshiyuki Okuda, Kei Hirose, Kenji Ohta, Saori Kawaguchi‐Imada, Kenta Oka   +4 more
wiley   +1 more source

An Analytical Model of Wavelength-dependent Opposition Surge in Emittance and Reflectance Spectroscopy of Airless Rocky Exoplanets

The Planetary Science Journal
Theoretical frameworks for reflection and emission spectroscopy of exoplanet surfaces are becoming increasingly important for the characterization of rocky exoplanets, especially with the rapid growth of the detected exoplanet population and ...
Leonardos Gkouvelis
doaj   +1 more source

Thermal Equation of State of Cubic Silicon Carbide at High Pressures

ChemPhysChem, Volume 25, Issue 9, May 2, 2024.
The thermoelastic properties of SiC with a zinc‐blende crystal structure are experimentally determined. Previous experimental studies contained errors due to significant uncertainties of measured pressures and temperatures and unreleased residual stresses.
Artem Chanyshev, Naira Martirosyan, Lin Wang, Amrita Chakraborti, Narangoo Purevjav, Fei Wang, Eun Jeong Kim, Hu Tang, Timofey Fedotenko, Shrikant Bhat, Robert Farla, Tomoo Katsura   +11 more
wiley   +1 more source

Analyses of Polluted White Dwarf Stars with Applications to the Geochemistry of Rocky Exoplanets [PDF]

, 2021
In this work, exoplanet-research is combined with the study of the solar system in order to assess differences and similarities between rocky bodies in the Milky Way. To evaluate rocky bodies outside of the solar system, I utilize optical spectroscopy to
Doyle, Alexandra
core