This strange lava-rich alien planet is making itself a new atmosphere

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Scientists think they've spied an alien world that lost its atmosphere — then conjured itself a new one.

This strange lava-rich alien planet is making itself a new atmosphere : Read more

 

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Some interesting exoplanet reports out today. GJ 1132 b is very interesting and very different than our Earth

Detection of an Atmosphere on a Rocky Exoplanet, https://arxiv.org/abs/2103.05657, 9-Mar-2021 has some details. My observation. From the arXiv paper attached, "GJ 1132 b has a mass of 1.66 ± 0.23 M⊕ and a radius of 1.16 ± 0.11 R⊕, resulting in a mean density of 6.3 ± 1.3 g cm^−3, establishing it as a terrestrial planet (Berta-Thompson et al. 2015; Bonfils et al. 2018). It orbits a cool M4.5 dwarf star with a period of 1.6 days. GJ 1132 b has an estimated equilibrium temperature (Bonfils et al. 2018) of 529 ± 9 K and receives an insolation of 19 times that of Earth, placing it in a population of high-insolation terrestrial planets that, as a group, have been identified as likely having lost the primordial H/He envelope (Owen & Wu 2017; Swain et al. 2019). Data from 5 visits of Hubble WFC3-G141 infrared grism transit observations of GJ 1132 b (PI Berta-Thompson, PID 14758) were downloaded from the MAST archive and, using the EXCALIBUR (EXoplanet CALIbration and Bayesian Unified Retrieval) science data pipeline, analyzed these data to produce a near-infrared transmission spectrum of the planet’s atmosphere.", ref - https://arxiv.org/pdf/2103.05657.pdf

I am glad the Earth is not like this hot exoplanet (529 K, water boils at 373 K) orbiting so close to its host star. The PDF paper shows the semi-major axis is 0.0153 au. A quick view of the exoplanet metrics and host star can be read here http://exoplanet.eu/catalog/gj_1132_b/