Search Publications
Measuring the ratio of the gas and dust emission radii of protoplanetary disks in the Lupus star-forming region
de Gregorio-Monsalvo, I.; Pascucci, I.; Testi, L. +15 more
We performed a comprehensive demographic study of the CO extent relative to dust of the disk population in the Lupus clouds in order to find indications of dust evolution and possible correlations with other disk properties. We increased the number of disks of the region with measured RCO and Rdust from observations with the …
The ASKAP Variables and Slow Transients (VAST) Pilot Survey
Ramsay, Gavin; Kaplan, David L.; Gaensler, B. M. +52 more
The Variables and Slow Transients Survey (VAST) on the Australian Square Kilometre Array Pathfinder (ASKAP) is designed to detect highly variable and transient radio sources on timescales from 5 s to $∼ 5$ yr. In this paper, we present the survey description, observation strategy and initial results from the VAST Phase I Pilot Survey. This pilot s…
Perturbers: SPHERE detection limits to planetary-mass companions in protoplanetary disks
Ménard, F.; Garufi, A.; Henning, Th. +25 more
The detection of a wide range of substructures such as rings, cavities, and spirals has become a common outcome of high spatial resolution imaging of protoplanetary disks, both in the near-infrared scattered light and in the thermal millimetre continuum emission. The most frequent interpretation of their origin is the presence of planetary-mass co…
Solar Orbiter: Mission and spacecraft design
Müller, D.; Zouganelis, I.; Cipriani, F. +37 more
The main scientific goal of Solar Orbiter is to address the central question of heliophysics: `how does the Sun create and control the heliosphere?' To achieve this goal, the spacecraft carries a unique combination of ten scientific instruments (six remote-sensing instruments and four in-situ instruments) towards the innermost regions of the Solar…
On the Compatibility of Ground-based and Space-based Data: WASP-96 b, an Example
Changeat, Quentin; Chubb, Katy L.; Edwards, Billy +5 more
The study of exoplanetary atmospheres relies on detecting minute changes in the transit depth at different wavelengths. To date, a number of ground- and space-based instruments have been used to obtain transmission spectra of exoplanets in different spectral bands. One common practice is to combine observations from different instruments in order …
A new, Gaia-based, catalogue of blue straggler stars in open clusters
Carraro, G.; Ahumada, J. A.; Rain, M. J.
Context. Blue straggler stars are exotic objects present in all stellar environments whose nature and formation channels are still partially unclear. They seem to be particularly abundant in open clusters (OCs), thus offering a unique chance to tackle these problems statistically.
Aims: We aim to build up a new and homogeneous catalogue of bl…
Mapping luminous hot stars in the Galaxy
Rix, H. -W.; Drimmel, R.; Poggio, E. +4 more
Luminous hot stars (MKs ≲ 0 mag and Teff ≳ 8000 K) dominate the stellar energy input to the interstellar medium throughout cosmological time, are used as laboratories to test theories of stellar evolution and multiplicity, and serve as luminous tracers of star formation in the Milky Way and other galaxies. Massive …
Visible-light Phase Curves from the Second Year of the TESS Primary Mission
Kane, Stephen R.; Fetherolf, Tara; Vanderspek, Roland +10 more
We carried out a systematic study of full-orbit phase curves for known transiting systems in the northern ecliptic sky that were observed during Year 2 of the TESS primary mission. We applied the same methodology for target selection, data processing, and light-curve fitting as we did in our Year 1 study. Out of the 15 transiting systems selected …
The first widespread solar energetic particle event observed by Solar Orbiter on 2020 November 29
Kulkarni, S. R.; Lario, D.; Laitinen, T. +66 more
Context. On 2020 November 29, the first widespread solar energetic particle (SEP) event of solar cycle 25 was observed at four widely separated locations in the inner (≲1 AU) heliosphere. Relativistic electrons as well as protons with energies > 50 MeV were observed by Solar Orbiter (SolO), Parker Solar Probe, the Solar Terrestrial Relations Ob…
Precise Dynamical Masses and Orbital Fits for β Pic b and β Pic c
Dupuy, Trent J.; Brandt, Timothy D.; Li, Yiting +2 more
We present a comprehensive orbital analysis to the exoplanets β Pictoris b and c that resolves previously reported tensions between the dynamical and evolutionary mass constraints on β Pic b. We use the Markov Chain Monte Carlo orbit code orvara to fit 15 years of radial velocities and relative astrometry (including recent GRAVITY measurements), a…