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Volatile Species in Comet 67P/Churyumov-Gerasimenko: Investigating the Link from the ISM to the Terrestrial Planets
Drozdovskaya, Maria N.; Rubin, Martin; Wampfler, Susanne F. +2 more
Comets contain abundant amounts of organic and inorganic species. Many of the volatile molecules in comets have also been observed in the interstellar medium and some of them even with similar relative abundances, indicating formation under similar conditions or even sharing a common chemical pathway. There is a growing amount of evidence that sug…
Near-resonance in a System of Sub-Neptunes from TESS
Kristiansen, Martti H.; Vanderburg, Andrew; Latham, David W. +78 more
We report the Transiting Exoplanet Survey Satellite detection of a multi-planet system orbiting the V = 10.9 K0 dwarf TOI-125. We find evidence for up to five planets, with varying confidence. Three transit signals with high signal-to-noise ratio correspond to sub-Neptune-sized planets (2.76, 2.79, and 2.94 R ⊕), and we statistically va…
Understanding WASP-12b
Goodman, Jeremy; Bailey, Avery
The orbital period of the hot Jupiter WASP-12b is apparently changing. We study whether this reflects orbital decay due to tidal dissipation in the star, or apsidal precession of a slightly eccentric orbit. In the latter case, a third body or other perturbation would be needed to sustain the eccentricity against tidal dissipation in the planet its…
A catalogue of stellar diameters and fluxes for mid-infrared interferometry
Meisenheimer, K.; Matter, A.; Jaffe, W. +14 more
We present the Mid-infrared stellar Diameters and Fluxes compilation Catalogue (MDFC) dedicated to long-baseline interferometry at mid-infrared wavelengths (3-13 µm). It gathers data for half a million stars, i.e. nearly all the stars of the Hipparcos-Tycho catalogue whose spectral type is reported in the SIMBAD data base. We cross-match 26 …
Ages and masses of 0.64 million red giant branch stars from the LAMOST Galactic Spectroscopic Survey
Shi, Jianrong; Zhao, Gang; Wu, Yaqian +14 more
We present a catalogue of stellar age and mass estimates for a sample of 640 986 red giant branch (RGB) stars of the Galactic disk from the LAMOST Galactic Spectroscopic Survey (DR4). The RGB stars are distinguished from the red clump (RC) stars utilizing period spacing derived from the spectra with a machine-learning method based on kernel princi…
The Mass Inflow and Outflow Rates of the Milky Way
Richter, Philipp; Heckman, Timothy M.; Fox, Andrew J. +5 more
We present new calculations of the mass inflow and outflow rates around the Milky Way (MW), derived from a catalog of ultraviolet metal-line high-velocity clouds (HVCs). These calculations are conducted by transforming the HVC velocities into the Galactic standard of rest (GSR) reference frame, identifying inflowing (v GSR < 0 km s
HST spectra reveal accretion in MY Lupi
France, K.; Alcalá, J. M.; Manara, C. F. +5 more
The mass accretion rate is a crucial parameter for the study of the evolution of accretion discs around young low-mass stellar and substellar objects (YSOs). We revisit the case of MY Lup, an object where VLT/X-shooter data suggested a negligible mass accretion rate, and show it to be accreting on a level similar to other Class II YSOs in Lupus ba…
Comet 67P/CG Nucleus Composition and Comparison to Other Comets
Mottola, Stefano; Kappel, David; Oklay, Nilda +9 more
We review our current knowledge of comet 67P/Churyumov-Gerasimenko nucleus composition as inferred from measurements made by remote sensing and in-situ instruments aboard Rosetta orbiter and Philae lander. Spectrophotometric properties (albedos, color indexes and Hapke parameters) of 67P/CG derived by Rosetta are discussed in the context of other …
Identifying Exoplanets with Deep Learning. II. Two New Super-Earths Uncovered by a Neural Network in K2 Data
Vanderburg, Andrew; Dattilo, Anne; Bieryla, Allyson +10 more
For years, scientists have used data from NASA’s Kepler Space Telescope to look for and discover thousands of transiting exoplanets. In its extended K2 mission, Kepler observed stars in various regions of the sky all across the ecliptic plane, and therefore in different galactic environments. Astronomers want to learn how the populations of exopla…
Automated crater detection on Mars using deep learning
Lee, Christopher
Impact crater cataloging is an important tool in the study of the geological history of planetary bodies in the Solar System, including dating of surface features and geologic mapping of surface processes. Catalogs of impact craters have been created by a diverse set of methods over many decades, including using visible or near infra-red imagery a…