Astrochemistry

ALMA Finds Methyl Isocyanate Around Infant Sun-like Stars

ALMA Finds Methyl Isocyanate Around Infant Sun-like Stars

ALMA has observed stars like the Sun at a very early stage in their formation and found traces of methyl isocyanate -- a chemical building block of life.

Astrochemistry

Neutral Buckminsterfullerene in the Diffuse Interstellar Medium

Neutral Buckminsterfullerene in the Diffuse Interstellar Medium

Emission of fullerenes in their infrared vibrational bands has been detected in space near hot stars.

Habitable Zones & Global Climate

A Warm or a Cold Early Earth? New Insights From a 3-D Climate-carbon Model

A Warm or a Cold Early Earth? New Insights From a 3-D Climate-carbon Model

Oxygen isotopes in marine cherts have been used to infer hot oceans during the Archean with temperatures between 60 deg C (333 K) and 80 deg C (353 K). Such climates are challenging for the early Earth warmed by the faint young Sun.

SETI

Radio Emission from the Exoplanetary System ε Eridani

Radio Emission from the Exoplanetary System ε Eridani

As part of a wider search for radio emission from nearby systems known or suspected to contain extrasolar planets ϵ Eridani was observed by the Jansky Very Large Array (VLA) in the 2-4 GHz and 4-8 GHz frequency bands.

Proxima Centauri b

The Detectability of Radio Auroral Emission from Proxima B

The Detectability of Radio Auroral Emission from Proxima B

Magnetically active stars possess stellar winds whose interaction with planetary magnetic fields produces radio auroral emission. We examine the detectability of radio auroral emission from Proxima b, the closest known exosolar planet orbiting our nearest neighboring star, Proxima Centauri.

Planetary Protection

The Goals, Rationales, and Definition of Planetary Protection: Interim Report

The Goals, Rationales, and Definition of Planetary Protection: Interim Report

In this time of rapid transition in exploring solar system bodies, the importance of reexamining planetary protection policies, including the need for clarity in how NASA establishes such policies, has become more urgent.

Extrasolar Planets

New Branch in Family Tree of Exoplanets Discovered

New Branch in Family Tree of Exoplanets Discovered

Since the mid-1990s, when the first planet around another Sun-like star was discovered, astronomers have been amassing what is now a large collection of exoplanets -- nearly 3,500 have been confirmed so far.

Extrasolar Planets

Stable Habitable Zones of Single Jovian Planet Systems

Stable Habitable Zones of Single Jovian Planet Systems

With continued improvement in telescope sensitivity and observational techniques, the search for rocky planets in stellar habitable zones is entering an exciting era. With so many exoplanetary systems available for follow-up observations to find potentially habitable planets, one needs to prioritise the ever-growing list of candidates.

Habitable Zones & Global Climate

Comparative Climates of TRAPPIST-1 Planetary System: Results From a Simple Climate-Vegetation Model

Comparative Climates of TRAPPIST-1 Planetary System: Results From a Simple Climate-Vegetation Model

The recent discovery of the planetary system hosted by the ultracool dwarf star TRAPPIST-1 could open new perspectives into the investigation of planetary climates of Earth-sized exoplanets, their atmospheres and their possible habitability.

Proxima Centauri b

Flare Activity and Photospheric Analysis of Proxima Centauri

Flare Activity and Photospheric Analysis of Proxima Centauri

We present the analysis of emission lines in high-resolution optical spectra of the planet-host star Proxima Centauri (Proxima) classified as a M5.5V. We carry out the detailed analysis of observed spectra to get a better understanding of the physical conditions of the atmosphere of this star.

TRAPPIST-1

The Threatening Environment of the TRAPPIST-1 Planets

The Threatening Environment of the TRAPPIST-1 Planets

Recently, four additional Earth-mass planets were discovered orbiting the nearby ultracool M8 dwarf TRAPPIST-1, making a remarkable total of seven planets with equilibrium temperatures compatible with the presence of liquid water on their surface.

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