Results 111 to 120 of about 2,941,415 (239)
Searching for Rotational X‐Ray Modulation on TIC 277539431
Astronomische Nachrichten, Volume 347, Issue 3, March 2026.ABSTRACT TIC 277539431, a fast rotating M7 dwarf, was detected to host the highest latitude flare to date at 81°$$ {81}^{{}^{\circ}} $$. Magnetic activity like stellar flares occurring at high latitude indicate occurrence of coronal loops at these latitudes on fully‐convective M dwarfs. In contrast, sunspots usually occur below 30°$$ {30}^{{}^{\circ}} $
Desmond Dsouza +2 more
wiley +1 more source
The Prevalence of Resonance Among Young, Close-in Planets
The Astronomical JournalMultiple planets undergoing disk migration may be captured into a chain of mean-motion resonances with the innermost planet parked near the disk’s inner edge.
Fei Dai +13 more
doaj +1 more source
Toward an initial mass function for giant planets
, 2017 The distribution of exoplanet masses is not primordial. After the initial stage of planet formation is complete, the gravitational interactions between planets can lead to the physical collision of two planets, or the ejection of one or more planets from
Carrera, Daniel +2 more
core +1 more source
The Bochum Survey of the Southern Galactic Disk: III. Complete Data Release
Astronomische Nachrichten, Volume 347, Issue 3, March 2026.ABSTRACT The Southern Galactic Disk Survey (GDS) monitored a mosaic of 268 fields along a 6°$$ {6}^{{}^{\circ}} $$‐wide stripe in the southern Galactic disk with simultaneous observations in r′$$ {r}^{\prime } $$ and i′$$ {i}^{\prime } $$ (7m≲r′,i′≲18m$$ {7}^{\mathrm{m}}\lesssim {r}^{\prime },{i}^{\prime}\lesssim {18}^{\mathrm{m}} $$) from September ...
Julia Blex +8 more
wiley +1 more source
Investigating the Origins of Hot Neptunes from Radial Velocity Data
The Astronomical JournalHot Neptunes are extrasolar planets that are similar in size to Neptune in our solar system but are much closer to their host stars, completing an orbit in 10 days or less. The origin of hot Neptunes is not fully understood.
Sophie Y. Zheng
doaj +1 more source
Effects of Hydrogen on Fe‐S Alloys and Their Implications for the Martian Core
Journal of Geophysical Research: Planets, Volume 131, Issue 3, March 2026.Abstract Meteorites suggest the Martian core comprises iron (Fe) or iron‐nickel (Fe‐Ni) alloy with sulfur (S) identified as the primary light element. The InSight data revealed a larger, less dense Martian core than previously estimated, indicating additional light elements.
Xuehui Wei +4 more
wiley +1 more source
Metal-enriched Atmospheres in Warm (Super- and Sub-) Neptunes Induced by Extreme Atmospheric Escape
The Astrophysical JournalPlanet formation impacts exoplanet atmospheres by accreting metals in solid form, leading to atmospheric carbon-to-oxygen ratios (C/O) and sulfur-to-nitrogen ratios (S/N) that deviate from those of their host stars. Recent observations indicate differing
Amy J. Louca, Yamila Miguel
doaj +1 more source
, 2008 The timescale over which planets may form in the circumstellar disks of young stars is one of the main issues of current planetary formation models. We present here new constraints on planet formation timescales derived from the rotational evolution of ...
Bouvier, Jerome
core +1 more source
CoRoT pictures transiting exoplanets
, 2015 The detection and characterization of exoplanets have made huge progresses since the first discoveries in the late nineties. In particular, the independent measurement of the mass and radius of planets, by combining the transit and radial-velociy ...
Deleuil, Magali, Moutou, Claire
core +3 more sources
, 2017 CONTEXT: High-precision stellar analyses require hydrodynamic modeling to interpret chemical abundances or oscillation modes. Exoplanet atmosphere studies require stellar background spectra to be known along the transit path while detection of Earth ...
Dahlén, Erik +3 more
core +2 more sources