Extrasolar Planets
Life Could Be Evolving Right Now on Nearest Exoplanets 
Rocky, Earth-like planets orbiting our closest stars could host life, according to a new study that raises the excitement about exoplanets.
Exoplanetary Atmospheres: Key Insights, Challenges and Prospects
Exoplanetary science is on the verge of an unprecedented revolution. The thousands of exoplanets discovered over the past decade have most recently been supplemented by discoveries of potentially habitable planets around nearby low-mass stars.
Towards a More Complex Description of Chemical Profiles in Exoplanets Retrievals: A 2-layer Parameterisation
State of the art spectral retrieval models of exoplanet atmospheres assume constant chemical profiles with altitude.
Searching for Exosatellites Orbiting L and T Dwarfs: Connecting Planet Formation to Moon Formation and Finding New Temperate Worlds
L-type and T-type dwarfs span the boundaries between main-sequence stars, brown dwarfs, and planetary-mass objects.
The L 98-59 System: Three Transiting, Terrestrial-Sized Planets Orbiting a Nearby M-dwarf
We report the Transiting Exoplanet Survey Satellite (TESS) discovery of three terrestrial-sized planets transiting L 98-59 (TOI-175, TIC 307210830) -- a bright M dwarf at a distance of 10.6 pc.
Lightning And Charge Processes In Brown Dwarf and Exoplanet Atmospheres
The study of the composition of brown dwarf atmospheres helped to understand their formation and evolution. Similarly, the study of exoplanet atmospheres is expected to constrain their formation and evolutionary states.
Thermo-compositional Diabatic Convection in the Atmospheres of Brown Dwarfs and in Earth's Atmosphere and Oceans
By generalizing the theory of convection to any type of thermal and compositional source terms (diabatic processes), we show that thermohaline convection in Earth oceans, fingering convection in stellar atmospheres, and moist convection in Earth atmosphere are deriving from the same general diabatic convective instability.
Cloud Atlas: High-Contrast Time-Resolved Observations of Planetary-Mass Companions
Directly-imaged planetary-mass companions offer unique opportunities in atmospheric studies of exoplanets. They share characteristics of both brown dwarfs and transiting exoplanets, therefore, are critical for connecting atmospheric characterizations for these objects.
Topography of (exo)planets
Current technology is not able to map the topography of rocky exoplanets, simply because the objects are too faint and far away to resolve them. Nevertheless, indirect effect of topography should be soon observable thanks to photometry techniques, and the possibility of detecting specular reflections.
The CARMENES Search For Exoplanets Around M Dwarfs
We use spectra from CARMENES, the Calar Alto high-Resolution search for M dwarfs with Exo-earths with Near-infrared and optical Echelle Spectrographs, to search for periods in chromospheric indices in 16 M0 to M2 dwarfs.
Stellar Flares from the First Tess Data Release: Exploring a New Sample of M-dwarfs
We perform a study of stellar flares for the 24,809 stars observed with 2 minute cadence during the first two months of the TESS mission.
Breezing Through The Space Environment of Barnard's Star b
A physically realistic stellar wind model based on Alfvén wave dissipation has been used to simulate the wind from Barnard's Star and to calculate the conditions at the location of its recently discovered planetary companion.
Kepler-730: A Hot Jupiter System with a Close-in, Transiting, Earth-sized Planet
Kepler-730 is a planetary system hosting a statistically validated hot Jupiter in a 6.49-day orbit and an additional transiting candidate in a 2.85-day orbit.
Stellar Activity Analysis of Barnard's Star
The search for Earth-like planets around late-type stars using ultra-stable spectrographs requires a very precise characterization of the stellar activity and the magnetic cycle of the star, since these phenomena induce radial velocity (RV) signals that can be misinterpreted as planetary signals.
Observability of Hydrogen-rich Exospheres in Earth-like Exoplanets
Context. The existence of an extended neutral hydrogen exosphere around small planets can be used as an evidence for the presence of water in their lower atmosphere but, to date, such feature has not been securely detected in rocky exoplanets.
What Magnetic Fields Can Tell Us About Life on Other Planets
Every school kid knows that Earth has a magnetic field -- it's what makes compasses align north-south and lets us navigate the oceans. It also protects the atmosphere, and thus life, from the Sun's powerful wind.
Revised Estimates of the Frequency of Earth-like Planets in the Kepler Field
The search for Earth-like planets around Sun-like stars and the evaluation of their occurrence rate is a major topic of research for the exoplanetary community.
Two Terrestrial Planet Families With Different Origins
The important role of stellar irradiation in envelope removal for planets with diameters of <2 R⊕ has been inferred both through theoretical work and the observed bimodal distribution of small planet occurrence as a function of radius.
Prospects For Detecting The Astrometric Signature of Barnard's Star b
A low-amplitude periodic signal in the radial-velocity (RV) time-series of Barnard's Star was recently attributed to a planetary companion with a minimum mass of ∼3.2 M⊕ at an orbital period of ∼233 days.
A Super-Earth Planet Candidate Orbiting at the Snow-line of Barnard's Star
At a distance of 1.8 parsecs, Barnard's star (Gl 699) is a red dwarf with the largest apparent motion of any known stellar object.
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Calendar
- 23 Apr: Outer Planets Assessment Group (OPAG)
- 24 Apr: Global Conference on Space for Emerging Countries – GLEC 2019
- 25 Apr: NASA Aerospace Safety Advisory Panel Meeting
- 26 Apr: Space Transportation Association Briefing With NASA Chief Scientist Jim Green
- 29 Apr: International Planetary Defense Conference
- 29 Apr: 6th IAA Planetary Defense Conference
- 30 Apr: NASA Advisory Council Human Exploration and Operations Committee Meeting
- 30 Apr: NASA Advisory Council Technology, Innovation and Engineering Committee Meeting
- 1 May: NASA Advisory Council; Regulatory and Policy Committee Meeting
- 2 May: NASA Advisory Council STEM Engagement Committee Meeting
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