Results 51 to 60 of about 2,563,330 (219)

Exoplanet biosignatures : a review of remotely detectable signs of life [PDF]

, 2017
In the coming years and decades, advanced space- and ground-based observatories will allow an unprecedented opportunity to probe the atmospheres and surfaces of potentially habitable exoplanets for signatures of life.
Grenfell, John Lee, Lyons, Timothy W., Meadows, Victoria S, Nancy Y. Kiang, Siddharth Hegde, Meadows, Victoria S., Chester E. Harman, Edward W. Schwieterman, Timothy W. Lyons, Hu, Renyu, Renyu Hu, Cockell, Charles S, Parenteau, Mary N., DasSarma, Shiladitya, Sarah Rugheimer, Fisher, Theresa M., Christopher T. Reinhard, Shiladitya DasSarma, Hilairy E. Hartnett, Victoria S. Meadows, Walker, Sara L., Kiang, Nancy Y, Sara I. Walker, Parenteau, Mary N, Harman, Chester E, Olson, Stephanie L, Schwieterman, Edward W., Hegde, Siddharth, John Lee Grenfell, Hartnett, Hilairy E., Walker, Sara I., Fisher, Theresa M, Reinhard, Christopher T., Mary N. Parenteau, Giada N. Arney, Rugheimer, Sarah, Reinhard, Christopher T, Schwieterman, Edward W, Arney, Giada N, Hartnett, Hilairy E, Harman, Chester E., Cockell, Charles S., Stephanie L. Olson, Charles S. Cockell, Arney, Giada N., Lyons, Timothy W, Kiang, Nancy Y., Walker, Sara I, Olson, Stephanie L., Theresa M. Fisher   +49 more
core   +1 more source

Strong Fractionation of Deuterium and Helium in Sub-Neptune Atmospheres along the Radius Valley

The Astrophysical Journal
We simulate atmospheric fractionation in escaping planetary atmospheres using IsoFATE , a new open-source numerical model. We expand the parameter space studied previously to planets with tenuous atmospheres that exhibit the greatest helium and deuterium
Collin Cherubim, Robin Wordsworth, Renyu Hu, Evgenya Shkolnik   +3 more
doaj   +1 more source

Exploring Warm Jupiter Migration Pathways with Eccentricities. I. Catalog of Uniform Keplerian Fits to Radial Velocities of 200 Warm Jupiters

The Astrophysical Journal Supplement Series
Giant planets are expected to predominantly form beyond the water-ice line and occasionally undergo inward migration. Unlike hot Jupiters, which can result from high-eccentricity tidal migration, warm Jupiters between 0.1 and 1 au (≈10–365 days) are in ...
Marvin Morgan, Brendan P. Bowler, Quang H. Tran, Robert A. Wittenmyer, Duncan J. Wright, George Zhou, Tyler R. Fairnington   +6 more
doaj   +1 more source

Evidence for Low-level Dynamical Excitation in Near-resonant Exoplanet Systems

The Astronomical Journal, 2023
The geometries of near-resonant planetary systems offer a relatively pristine window into the initial conditions of exoplanet systems. Given that near-resonant systems have likely experienced minimal dynamical disruptions, the spin–orbit orientations of ...
Malena Rice, Xian-Yu Wang, Songhu Wang, Avi Shporer, Khalid Barkaoui, Rafael Brahm, Karen A. Collins, Andrés Jordán, Nataliea Lowson, R. Paul Butler, Jeffrey D. Crane, Stephen Shectman, Johanna K. Teske, David Osip, Kevin I. Collins, Felipe Murgas, Gavin Boyle, Francisco J. Pozuelos, Mathilde Timmermans, Emmanuel Jehin, Michaël Gillon   +20 more
doaj   +1 more source

A Solar Analog Model for Decrease in Far Ultraviolet Irradiance Under a Grand Minimum

Earth and Space Science, Volume 13, Issue 9, September 2026.
Abstract Solar analog field stars having a range of magnetic activity can provide an estimate of solar spectral irradiance (SSI) variability relevant to understanding the Sun's influence on terrestrial climate. This approach is particularly useful for far ultraviolet (FUV) irradiance that cannot be observed from the Earth surface.
D. Lubin, C. Melis, D. Tytler
wiley   +1 more source

Democratizing & Enhancing Exoplanet Research with the Unistellar Citizen Science Network & Astronomy Modeling Instruction [PDF]

This thesis explores the potential in democratizing and augmenting exoplanet research via citizen science by utilizing a global network of portable image-intensified computerized telescopes, and inquiry-based astronomy instruction. A central objective is
Peluso, Daniel O’Conner
core   +1 more source

The Habitable Exoplanet Observatory (HabEx) [PDF]

, 2018
The Habitable-Exoplanet Observatory (HabEx) is a candidate flagship mission being studied by NASA and the astrophysics community in preparation of the 2020 Decadal Survey.
Prusti, Timo, Gaudi, Bernard, Clarke, John, Somerville, Rachel, Kasdin, Jeremy, Marois, Christian, Rogers, Leslie, Kiessling, Alina, Gaudi, B. Scott, Turnbull, Margaret, Tamura, Motohide, Still, Martin, Seager, Sara, Quirrenbach, Andreas, Kuan, Gary, Mennesson, Bertrand, Feinberg, Lee, Warfield, Keith, Stark, Christopher, Stern, Daniel, Scowen, Paul, Cahoy, Kerri, Domagal-Goldman, shawn, Robinson, Tyler, Booth, Jeffrey, Mawet, Dimitri, Mouillet, David, Stapelfeldt, Karl, Guyon, Olivier   +28 more
core   +1 more source

Statistical Scale Analyses of a Diurnal Periodicity in Auroral Kilometric Radiation, Observed by Wind/WAVES

Journal of Geophysical Research: Space Physics, Volume 131, Issue 9, September 2026.
Abstract The Earth's strongest natural radio emission is Auroral Kilometric Radiation (AKR), which is correlated with auroral intensity, and is a barometer for space weather. AKR is generated by the electron cyclotron maser instability, with sources on auroral field lines. Previous work on AKR and radio emissions from other planets (or stars) points to
Alexandra Ruth Fogg, S. Wu, C. M. Jackman, S. J. Walker, M. J. Rutala, C. K. Louis, S. M. Ivanov, L. Lamy, J. E. Waters, D. K. Whiter   +9 more
wiley   +1 more source

Stellar rotation and its connection to the evolution of hydrogen‐dominated atmospheres of exoplanets [PDF]

Astronomische Nachrichten, 2021
AbstractThe population of known low‐ to intermediate‐mass exoplanets shows a large spread in densities, which is believed to be due to the diversity of planetary atmospheres and thus controlled by planetary atmospheric mass loss. One of the main drivers of long‐term atmospheric escape is the absorption of high‐energy X‐ray + extreme ultraviolet (XUV ...
openaire   +2 more sources

Inferring Io's Internal Properties by Combining Gravity Measurements and Volcanic Activity

Journal of Geophysical Research: Planets, Volume 131, Issue 9, September 2026.
Abstract With its extreme geological activity, Io represents an archetype for tidally heated exoplanets/moons and provides insight into early stages of terrestrial planet evolution. Decades of ground‐based observations and multiple space missions have refined our understanding of Io, yet it remains debated where inside Io the tidal heating takes place.
A. Veenstra, M. Rovira‐Navarro, W. van der Wal   +2 more
wiley   +1 more source