8/18/2023 0 Comments Stephen collins neptunes cove![]() Cell proliferation at 122 ☌ and isotopically heavy CH 4 production by a hyperthermophilic methanogen under high-pressure cultivation. Identifying planetary biosignature impostors: spectral features of CO and O 4 resulting from abiotic O 2/O 3 production. Testing the detectability of extraterrestrial O 2 with the extremely large telescopes using real data with real noise. Extreme water loss and abiotic O 2 buildup on planets throughout the habitable zones of M dwarfs. ![]() Kepler multi-planet systems exhibit unexpected intra-system uniformity in mass and radius. Testing in situ assembly with the Kepler planet candidate sample. A framework for prioritizing the TESS planetary candidates most amenable to atmospheric characterization. PandExo: a community tool for transiting exoplanet science with JWST HST. Architecture and dynamics of Kepler’s candidate multiple transiting planet systems. A temperate rocky super-Earth transiting a nearby cool star. Stellar and planetary properties of K2 campaign 1 candidates and validation of 17 planets, including a planet receiving Earth-like insolation. A nearby M star with three transiting super-Earths discovered by K2. ESPRESSO: the Echelle spectrograph for rocky exoplanets and stable spectroscopic observations. TTVFast: an efficient and accurate code for transit timing inversion problems. Probabilistic forecasting of the masses and radii of other worlds. Planetary radii across five orders of magnitude in mass and stellar insolation: application to transits. An asteroseismic view of the radius valley: stripped cores, not born rocky. Precise planet radii leveraging Gaia DR2 reveal the stellar mass dependence of the planet radius gap. Transiting Exoplanet Survey Satellite (TESS). Altogether, very few systems with small, temperate exoplanets are as suitable for such complementary and detailed characterization as TOI-270. ![]() TOI-270 is a prime target for future studies because (1) its near-resonance allows the detection of transit timing variations, enabling precise mass measurements and dynamical studies (2) its brightness enables independent radial-velocity mass measurements (3) the outer planets are ideal for atmospheric characterization via transmission spectroscopy and (4) the quietness of the star enables future searches for habitable zone planets. The planets orbit close to a mean-motion resonant chain, with periods (3.36 days, 5.66 days and 11.38 days, respectively) near ratios of small integers (5:3 and 2:1). The M3V-type star is transited by the super-Earth-sized planet TOI-270 b ( \(\) R ⊕) and the sub-Neptune-sized planets TOI-270 c (2.42 ± 0.13 R ⊕) and TOI-270 d (2.13 ± 0.12 R ⊕). Here we report the Transiting Exoplanet Survey Satellite (TESS) 1 discovery of three small planets transiting one of the nearest and brightest M dwarf hosts observed to date, TOI-270 (TIC 259377017, with K-magnitude 8.3, and 22.5 parsecs away from Earth). These studies are facilitated by small and cool M dwarf host stars. This enables the characterization of planetary sizes, orbits, bulk compositions, atmospheres and formation histories. One of the primary goals of exoplanetary science is to detect small, temperate planets passing (transiting) in front of bright and quiet host stars. Nature Astronomy volume 3, pages 1099–1108 ( 2019) Cite this article A super-Earth and two sub-Neptunes transiting the nearby and quiet M dwarf TOI-270
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