Neil Murphy

Dublin constituency sees independents challenge main parties amid anger over Middle East war and migration

Computer modelling suggests ice melt is possible within three to six years, earlier than previously thought

Eradication of cancer-causing bacteria in human gut could lead to 'huge public benefits', scientists say

Downing Street says the UK leader will hold talks in Abu Dhabi on Monday before heading to Saudi Arabia to meet Crown Prince Mohammed bin Salman

Report marking Cop16 summit in Saudi Arabia says more quarter of humans face conditions that 'redefine life on Earth'

Research adds to growing body of evidence that 1.5°C target in 2015 Paris Agreement is now out of reach

Five men appear in Amsterdam court accused of orchestrating violence on Israeli supporters last month

M-type stars are the most common stars in the Universe. They are ideal hosts for the search of exoplanets in the habitable zone (HZ), as their small size and low temperature make the HZ much closer-in than their solar twins. Harboring very deep convective layers, they also usually exhibit very intense magnetic fields. Understanding their environment, in particular their coronal and wind properties, is thus very important, as they might be very different from what is observed in the solar system. The mass-loss rate of M-type stars is poorly known observationally, and recent attempts to estimate it for some of them (e.g., TRAPPIST-1 and Proxima Centauri) can vary by an order of magnitude. In this work, we revisit the stellar wind properties of M dwarfs in the light of the latest estimates of Ṁ through Lyα absorption at the astropause and slingshot prominences. We outline a modeling strategy to estimate the mass-loss rate, radiative loss, and wind speed, with uncertainties, based on an Alfvén-wave-driven stellar wind model. We find that it is very likely that several TRAPPIST-1 planets lie within the Alfvén surface, which implies that these planets experience star–planet magnetic interactions (SPMIs). We also find that SPMIs between Proxima Cen b and its host star could be the reason for recently observed radio emissions.

Leading analyst says the challenge for warring parties in the region has fundamentally changed as a result of reverses for the Iranian camp

Social Democrat has led a minority government since the collapse of his coalition on November 6