Search Publications
Occurrence and Architecture of Kepler Planetary Systems as Functions of Stellar Mass and Effective Temperature
Zhou, Ji-Lin; Xie, Ji-Wei; Yang, Jia-Yi
The Kepler mission has discovered thousands of exoplanets around various stars with different spectral types (M, K, G, and F) and thus different masses and effective temperatures. Previous studies have shown that the planet occurrence rate, in terms of the average number of planets per star, drops with increasing stellar effective temperature (T
A Review of Possible Planetary Atmospheres in the TRAPPIST-1 System
Demory, Brice-Olivier; Leconte, Jérémy; Turbet, Martin +4 more
TRAPPIST-1 is a fantastic nearby (∼39.14 light years) planetary system made of at least seven transiting terrestrial-size, terrestrial-mass planets all receiving a moderate amount of irradiation. To date, this is the most observationally favourable system of potentially habitable planets known to exist. Since the announcement of the discovery of t…
Time-delay cosmographic forecasts with strong lensing and JWST stellar kinematics
Suyu, Sherry H.; Yıldırım, Akın; Halkola, Aleksi
We present a joint strong lensing and stellar dynamical framework for future time-delay cosmography purposes. Based on a pixelated source reconstruction and the axisymmetric Jeans equations, we are capable of constraining cosmological distances and hence the current expansion rate of the Universe (H0) to the few per cent level per lens,…
HADES RV programme with HARPS-N at TNG. XII. The abundance signature of M dwarf stars with planets
Baratella, M.; Rebolo, R.; Ribas, I. +27 more
Context. Most of our current knowledge on planet formation is still based on the analysis of main sequence, solar-type stars. Conversely, detailed chemical studies of large samples of M dwarfs hosting planets are still missing.
Aims: Correlations exist between the presence of different types of planets around FGK stars and metallicity, indivi…
Magnetic Reconnection during the Post-impulsive Phase of a Long-duration Solar Flare: Bidirectional Outflows as a Cause of Microwave and X-Ray Bursts
Reeves, Katharine K.; Chen, Bin; Yu, Sijie +5 more
Magnetic reconnection plays a crucial role in powering solar flares, production of energetic particles, and plasma heating. However, where the magnetic reconnections occur, how and where the released magnetic energy is transported, and how it is converted to other forms remain unclear. Here we report recurring bidirectional plasma outflows located…
The gas production of 14 species from comet 67P/Churyumov-Gerasimenko based on DFMS/COPS data from 2014 to 2016
Altwegg, Kathrin; Rubin, Martin; Läuter, Matthias +1 more
The coma of comet 67P/Churyumov-Gerasimenko has been probed by the Rosetta spacecraft and shows a variety of different molecules. The ROSINA COmet Pressure Sensor and the Double Focusing Mass Spectrometer provide in situ densities for many volatile compounds including the 14 gas species H2O, CO2, CO, H2S, O2
Rationale for BepiColombo Studies of Mercury's Surface and Composition
Muinonen, Karri; Wurz, Peter; Massironi, Matteo +63 more
BepiColombo has a larger and in many ways more capable suite of instruments relevant for determination of the topographic, physical, chemical and mineralogical properties of Mercury's surface than the suite carried by NASA's MESSENGER spacecraft. Moreover, BepiColombo's data rate is substantially higher. This equips it to confirm, elaborate upon, …
Systematic Phase Curve Study of Known Transiting Systems from Year One of the TESS Mission
Latham, David W.; Kane, Stephen R.; Fetherolf, Tara +14 more
We present a systematic phase curve analysis of known transiting systems observed by the Transiting Exoplanet Survey Satellite (TESS) during year one of the primary mission. Using theoretical predictions for the amplitude of the planetary longitudinal atmospheric brightness modulation, stellar ellipsoidal distortion and Doppler boosting, as well a…
A Flare-type IV Burst Event from Proxima Centauri and Implications for Space Weather
Kaplan, David L.; Cairns, Iver H.; Lenc, Emil +10 more
Studies of solar radio bursts play an important role in understanding the dynamics and acceleration processes behind solar space weather events, and the influence of solar magnetic activity on solar system planets. Similar low-frequency bursts detected from active M-dwarfs are expected to probe their space weather environments and therefore the ha…
The Next Generation Virgo Cluster Survey (NGVS). XIV. The Discovery of Low-mass Galaxies and a New Galaxy Catalog in the Core of the Virgo Cluster
Jordán, Andrés; Zhang, Hongxin; Emsellem, Eric +28 more
The Next Generation Virgo Cluster Survey (NGVS) was designed to provide a deep census of baryonic structures in the Virgo cluster. The survey covers the 104 deg2 area from the core of Virgo out to one virial radius, in the u*griz bandpasses, to a point-source depth of g ∼ 25.9 mag (10σ) and a single pixel surface brightness limit of &mi…