Field Reports

Astrobiologist Dale Andersen Antarctic Status Report 23 November 2017: High Winds

Astrobiologist Dale Andersen Antarctic Status Report 23 November 2017: High Winds

Dale Andersen sent this message on 23 November 2017 at 4:08:18 AM EST: "Yesterday started very nicely with sunshine and little or no winds so the morning hours were pretty productive. But by noon, katabatics let loose a barrage of winds and blowing snow that shut us down for most activities in the afternoon."

Analog Studies

Astrobiologist Dale Andersen Antarctic Status Report 22 November 2017: Nice Weather

Astrobiologist Dale Andersen Antarctic Status Report 22 November 2017: Nice Weather

Dale Andersen sent this message on 22 November 2017 3:00:56 AM EST: "We have a second day of nice weather with clear skies and light winds which is quite helpful to us."

TRAPPIST-1

The TRAPPIST-1 System: Orbital Evolution, Tidal Dissipation, Formation and Habitability

The TRAPPIST-1 System: Orbital Evolution, Tidal Dissipation, Formation and Habitability

We study the dynamical evolution of the TRAPPIST-1 system under the influence of orbital circularization through tidal interaction with the central star.

Extrasolar Planets

Influence of XUV Irradiation from Sgr A* on Planetary Habitability and Occurrence of Panspermia near the Galactic Center

Influence of XUV Irradiation from Sgr A* on Planetary Habitability and Occurrence of Panspermia near the Galactic Center

Black holes growing via the accretion of gas emit radiation that can photoevaporate the atmospheres of nearby planets.

Extrasolar Planets

Whole Planet Coupling Between Climate, Mantle, and Core: Implications for Evolution of Rocky Planets

Whole Planet Coupling Between Climate, Mantle, and Core: Implications for Evolution of Rocky Planets

Earth's climate, mantle, and core interact over geologic timescales.

Proxima Centauri b

Searching For Transit of Earth--mass Exoplanet Proxima~Centauri~b in Antarctica: Preliminary Result

Searching For Transit of Earth--mass Exoplanet Proxima~Centauri~b in Antarctica: Preliminary Result

Proxima~Centauri is known as the closest star from the Sun. Recently, radial velocity observations revealed the existence of an Earth--mass planet around it. With an orbital period of ∼11 days, the surface of Proxima Centauri b is temperate and might be habitable.

Mars

Previous Evidence of Water on Mars Now Identified as Grain Flows

Previous Evidence of Water on Mars Now Identified as Grain Flows

Dark features previously proposed as evidence for significant liquid water flowing on Mars have now been identified as granular flows, where sand and dust move rather than liquid water.

Field Reports

Astrobiologist Dale Andersen Antarctic Status Report 20 November 2017: Preparing Diving Gear

Astrobiologist Dale Andersen Antarctic Status Report 20 November 2017: Preparing Diving Gear

Dale Andersen sent this message from: Lat -71.33293 Lon 13.45381 on 20 November 2017 5:22:14 AM EST: "Hi Keith: Looks like our weather is improving, but we still have strong gusting winds (25-30 knots and occasional 40 knot gusts) with blowing snow, but it is much nicer than yesterday so hopefully this afternoon and tomorrow it will settle down and we can get back to our field work.

Mars

Observations Of A New Stabilizing Effect For Polar Water Ice On Mars

Observations Of A New Stabilizing Effect For Polar Water Ice On Mars

Using the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM), we map the temporal variability of water ice absorption bands over the near-polar ice mound in Louth crater, Mars.

Alpha Centauri

Planet Detectability in the Alpha Centauri System

Planet Detectability in the Alpha Centauri System

We use more than a decade of radial velocity measurements for α Cen A, B, and Proxima Centauri from HARPS, CHIRON, and UVES to identify the Msini and orbital periods of planets that could have been detected if they existed.

Field Reports

Astrobiologist Dale Andersen Antarctic Status Report 19 November 2017: Bad Weather

Astrobiologist Dale Andersen Antarctic Status Report 19 November 2017: Bad Weather

Dale Andersen sent this message from: Lat -71.33293 Lon 13.45381 on 19 November 2017 at 1:43:18 AM EST: "The weather here is pretty bad with high winds gusting at 45-50 knots and a lot of blowing snow causing whiteout conditions here at the lake.

More top stories from November.