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Annular substructures in the transition disks around LkCa 15 and J1610
Ansdell, M.; Facchini, S.; Pinilla, P. +8 more
We present high-resolution millimeter continuum ALMA observations of the disks around the T Tauri stars LkCa 15 and 2MASS J16100501-2132318 (hereafter, J1610). These transition disks host dust-depleted inner regions, which have possibly been carved by massive planets, and they are of prime interest to the study of the imprints of planet-disk inter…
The Hi-GAL catalogue of dusty filamentary structures in the Galactic plane
Umana, G.; Moore, T. J. T.; Palmeirim, P. +27 more
The recent data collected by Herschel have confirmed that interstellar structures with a filamentary shape are ubiquitously present in the Milky Way. Filaments are thought to be formed by several physical mechanisms acting from large Galactic scales down to subparsec fractions of molecular clouds, and they might represent a possible link between s…
SN2019dge: A Helium-rich Ultra-stripped Envelope Supernova
Kulkarni, S. R.; Duev, Dmitry A.; Rusholme, Ben +28 more
We present observations of ZTF18abfcmjw (SN2019dge), a helium-rich supernova with a fast-evolving light curve indicating an extremely low ejecta mass (≈0.33 M⊙) and low kinetic energy (≈1.3 × 1050 erg). Early-time (<4 days after explosion) photometry reveals evidence of shock cooling from an extended helium-rich envelope o…
Caltech-NRAO Stripe 82 Survey (CNSS). III. The First Radio-discovered Tidal Disruption Event, CNSS J0019+00
Cenko, S. B.; Kulkarni, S. R.; Hallinan, G. +8 more
We present the discovery of a nuclear transient with the Caltech-NRAO Stripe 82 Survey (CNSS), a dedicated radio transient survey carried out with the Karl G. Jansky Very Large Array (VLA). This transient, CNSS J001947.3+003527, exhibited a turn-on over a timescale of ≲1 yr, increasing in flux density at 3 GHz from <0.14 mJy in 2014 February to…
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