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35 results
Zeng, L., Jacobsen, S. B., Hyung, E., Levi, A., Nava, C., Kirk, J., Piaulet, C., Lacedelli, G., Sasselov, D. D., Petaev, M. I., Stewart, S. T., Alam, M. K., López-Morales, M., Damasso, M., & Latham, D. W. (2021). New Perspectives on the Exoplanet Radius Gap from a Mathematica Tool and Visualized Water Equation of State. \apj, 923(2), 247. https://doi.org/10.3847/1538-4357/ac3137
Zeng, L., Jacobsen, S. B., Hyung, E., Levi, A., Nava, C., Kirk, J., Piaulet, C., Lacedelli, G., Sasselov, D. D., Petaev, M. I., Stewart, S. T., Alam, M. K., López-Morales, M., Damasso, M., & Latham, D. W. (2021). New Perspectives on the Exoplanet Radius Gap from a Mathematica Tool and Visualized Water Equation of State. \apj, 923(2), 247. https://doi.org/10.3847/1538-4357/ac3137
Kufner, D. C. L., Zinth, P. W., & Bucher, D. D. B. (2020). UV‐Induced Charge‐Transfer States in Short Guanosine‐Containing DNA Oligonucleotides. ChemBioChem, 21.
Kufner, D. C. L., Zinth, P. W., & Bucher, D. D. B. (2020). UV‐Induced Charge‐Transfer States in Short Guanosine‐Containing DNA Oligonucleotides. ChemBioChem, 21.
Charge transfer has proven to be an important mechanism in DNA photochemistry. In particular, guanine (dG) plays a major role as an electron donor, but the photophysical dynamics of dG‐containing charge‐transfer states have not been extensively...
Sasselov, D. D., Grotzinger, J. P., & Sutherland, J. D. (2020). The origin of life as a planetary phenomenon . Science Advances, 6(6).
Sasselov, D. D., Grotzinger, J. P., & Sutherland, J. D. (2020). The origin of life as a planetary phenomenon . Science Advances, 6(6).
We advocate an integrative approach between laboratory experiments in prebiotic chemistry and geologic, geochemical, and astrophysical observations to help assemble a robust chemical pathway to life that can be reproduced in the laboratory. The...
Todd, Z. R., Fahrenbach, A. C., Ranjan, S., Magnani, C. J., Szostak, J. W., & Sasselov, D. D. (2020). Ultraviolet-Driven Deamination of Cytidine Ribonucleotides Under Planetary Conditions. Astrobiology, 20(7), 878-888.
Todd, Z. R., Fahrenbach, A. C., Ranjan, S., Magnani, C. J., Szostak, J. W., & Sasselov, D. D. (2020). Ultraviolet-Driven Deamination of Cytidine Ribonucleotides Under Planetary Conditions. Astrobiology, 20(7), 878-888.
A previously proposed synthesis of pyrimidine ribonucleotides makes use of ultraviolet (UV) light to convert β-uc(d)-ribocytidine-2',3'-cyclic phosphate to β-uc(d)-ribouridine-2',3'-cyclic phosphate, while simultaneously selectively degrading synthetic...
Todd, Z. R., & Öberg, K. I. (2020). Cometary Delivery of Hydrogen Cyanide to the Early Earth. Astrobiology.
Todd, Z. R., & Öberg, K. I. (2020). Cometary Delivery of Hydrogen Cyanide to the Early Earth. Astrobiology.
Delivery of water and organics by asteroid and comet impacts may have influenced prebiotic chemistry on the early Earth. Some recent prebiotic chemistry experiments emphasize hydrogen cyanide (HCN) as a feedstock molecule for the formation of sugars...
Collier Cameron, A., Mortier, A., Phillips, D., & al. (2019). Three years of Sun-as-a-star radial-velocity observations on the approach to solar minimum. Monthly Notices of the Royal Astronomical Society, 487(1), 1082-1100. https://doi.org/10.1093/mnras/stz1215 (Original work published 2019)
Collier Cameron, A., Mortier, A., Phillips, D., & al. (2019). Three years of Sun-as-a-star radial-velocity observations on the approach to solar minimum. Monthly Notices of the Royal Astronomical Society, 487(1), 1082-1100. https://doi.org/10.1093/mnras/stz1215 (Original work published 2019)
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...
Maldonado, J., Phillips, D., Dumusque, X., & al. (2019). Temporal evolution and correlations of optical activity indicators measured in Sun-as-a-star observations. Astronomy and Astrophysics, 627, A118. https://doi.org/10.1051/0004-6361/201935233 (Original work published 2019)
Maldonado, J., Phillips, D., Dumusque, X., & al. (2019). Temporal evolution and correlations of optical activity indicators measured in Sun-as-a-star observations. Astronomy and Astrophysics, 627, A118. https://doi.org/10.1051/0004-6361/201935233 (Original work published 2019)
Context. Understanding stellar activity in solar-type stars is crucial for the physics of stellar atmospheres as well as for ongoing exoplanet programmes.
Aims. We aim to test how well we understand stellar activity using our own star, the Sun, as a test...
Zeng, L., Jacobsen, S. B., Sasselov, D. D., Petaev, M. I., Vanderburg, A., Lopez-Morales, M., Perez-Mercader, J., & al. (2019). Growth model interpretation of planet size distribution. Proceedings of the National Academy of Science, 116(20), 9723-9728. https://doi.org/10.1073/pnas.1812905116 (Original work published 2019)
Zeng, L., Jacobsen, S. B., Sasselov, D. D., Petaev, M. I., Vanderburg, A., Lopez-Morales, M., Perez-Mercader, J., & al. (2019). Growth model interpretation of planet size distribution. Proceedings of the National Academy of Science, 116(20), 9723-9728. https://doi.org/10.1073/pnas.1812905116 (Original work published 2019)
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...
Rice, K., Malavolta, L., Mayo, A., & al. (2019). Masses and radii for the three super-Earths orbiting GJ 9827, and implications for the composition of small exoplanets. Monthly Notices of the Royal Astronomical Society, 484(3), 3731-3745. https://doi.org/10.1093/mnras/stz130 (Original work published 2019)
Rice, K., Malavolta, L., Mayo, A., & al. (2019). Masses and radii for the three super-Earths orbiting GJ 9827, and implications for the composition of small exoplanets. Monthly Notices of the Royal Astronomical Society, 484(3), 3731-3745. https://doi.org/10.1093/mnras/stz130 (Original work published 2019)
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...
Ranjan, S., Todd, Z. R., Rimmer, P. B., Sasselov, D. D., & Babbin, A. R. (2019). Nitrogen Oxide Concentrations in Natural Waters on Early Earth. Geochemistry, Geophysics, Geosystems, 20(4), 2021-2039. https://doi.org/10.1029/2018GC008082 (Original work published 2019)
Ranjan, S., Todd, Z. R., Rimmer, P. B., Sasselov, D. D., & Babbin, A. R. (2019). Nitrogen Oxide Concentrations in Natural Waters on Early Earth. Geochemistry, Geophysics, Geosystems, 20(4), 2021-2039. https://doi.org/10.1029/2018GC008082 (Original work published 2019)
A key challenge in origins‐of‐life studies is estimating the abundances of species relevant to the chemical pathways proposed to have contributed to the emergence of life on early Earth. Dissolved nitrogen oxide anions ( ), in particular nitrate ( ) and...
Milbourne, T., Haywood, R., Phillips, D., & al. (2019). HARPS-N Solar RVs Are Dominated by Large, Bright Magnetic Regions. The Astrophysical Journal, 874(1), 107. https://doi.org/10.3847/1538-4357/ab064a (Original work published 2019)
Milbourne, T., Haywood, R., Phillips, D., & al. (2019). HARPS-N Solar RVs Are Dominated by Large, Bright Magnetic Regions. The Astrophysical Journal, 874(1), 107. https://doi.org/10.3847/1538-4357/ab064a (Original work published 2019)
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...
Kosiarek, M. R., Blunt, S., López-Morales, M., & al. (2019). K2-291b: A Rocky Super-Earth in a 2.2 day Orbit. The Astrophysical Journal, 157(3), 116. https://doi.org/10.3847/1538-3881/aafe83 (Original work published 2019)
Kosiarek, M. R., Blunt, S., López-Morales, M., & al. (2019). K2-291b: A Rocky Super-Earth in a 2.2 day Orbit. The Astrophysical Journal, 157(3), 116. https://doi.org/10.3847/1538-3881/aafe83 (Original work published 2019)
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...