cc055070_obc_publicity.pdf
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17 results for "2019"
17 results for "2019"
Earliest life may have arisen in ponds, not oceans
News
Study finds shallow bodies of water were probably more suitable for Earth’s first life forms.
UV photostability of three 2-aminoazoles with key roles in prebiotic chemistry on the early earth
News
Three molecules (2-aminoimidazole, 2-aminothiazole, and 2-aminooxazole) that could play important roles in prebiotic chemistry have varying lifetimes under UV radiation likely present on the early Earth. These UV lifetimes can help constrain potential...
TESS Discovery of an Ultra-short-period Planet around the Nearby M Dwarf LHS 3844
Journal Article
Data from the newly commissioned Transiting Exoplanet Survey Satellite has revealed a "hot Earth" around LHS 3844, an M dwarf located 15 pc away. The planet has a radius of R ⊕ and orbits the star every 11 hr. Although the existence of an atmosphere...
UV photostability of three 2-aminoazoles with key roles in prebiotic chemistry on the early earth†
Journal Article
Three related molecules in the 2-aminoazole family are potentially important for prebiotic chemistry: 2-aminooxazole, 2-aminoimidazole, and 2-aminothiazole, which can provide critical functions as an intermediate in nucleotide synthesis, a nucleotide...
Growth model interpretation of planet size distribution
Journal Article
The radii and orbital periods of 4,000+ confirmed/candidate exoplanets have been precisely measured by the Kepler mission. The radii show a bimodal distribution, with two peaks corresponding to smaller planets (likely rocky) and larger intermediate-size...
Masses and radii for the three super-Earths orbiting GJ 9827, and implications for the composition of small exoplanets
Journal Article
Super-Earths belong to a class of planet not found in the Solar system, but which appear common in the Galaxy. Given that some super-Earths are rocky, while others retain substantial atmospheres, their study can provide clues as to the formation of both...
K2-291b: A Rocky Super-Earth in a 2.2 day Orbit
Journal Article
K2-291 is a solar-type star with a radius of R * = 0.899 ± 0.034 R ⊙ and mass of M* = 0.934 ± 0.038 M ⊙. From the K2 C13 data, we found one super-Earth planet (R p = R ⊕) transiting this star on a short period orbit (P = days). We followed this system...
Three years of Sun-as-a-star radial-velocity observations on the approach to solar minimum
Journal Article
The time-variable velocity fields of solar-type stars limit the precision of radial-velocity determinations of their planets’ masses, obstructing detection of Earth twins. Since 2015 July, we have been monitoring disc-integrated sunlight in daytime using...
HARPS-N Solar RVs Are Dominated by Large, Bright Magnetic Regions
Journal Article
State-of-the-art radial-velocity (RV) exoplanet searches are currently limited by RV signals arising from stellar magnetic activity. We analyze solar observations acquired over a 3 yr period during the decline of Carrington Cycle 24 to test models of RV...