Search Publications
The Architecture of the V892 Tau System: The Binary and Its Circumbinary Disk
Henning, Thomas; Wilner, David J.; Kwon, Woojin +11 more
We present high-resolution millimeter continuum and CO line observations for the circumbinary disk around V892 Tau to constrain the stellar and disk properties. The total mass of the two near-equal-mass A stars is estimated to be 6.0 ± 0.2 M⊙ based on our models of the Keplerian-dominated gas disk rotation. The detection of strong ioniz…
A homogeneous spectroscopic analysis of a Kepler legacy sample of dwarfs for gravity-mode asteroseismology
Li, Gang; Rix, Hans-Walter; Bowman, Dominic M. +12 more
Context. Asteroseismic modelling of the internal structure of main-sequence stars born with a convective core has so far been based on homogeneous analyses of space photometric Kepler light curves of four years in duration, to which most often incomplete inhomogeneously-deduced spectroscopic information was added to break degeneracies.
Aims: …
Whistler waves observed by Solar Orbiter/RPW between 0.5 AU and 1 AU
Maksimovic, M.; Bale, S. D.; Chust, T. +29 more
Context. Solar wind evolution differs from a simple radial expansion, while wave-particle interactions are assumed to be the major cause for the observed dynamics of the electron distribution function. In particular, whistler waves are thought to inhibit the electron heat flux and ensure the diffusion of the field-aligned energetic electrons (Stra…
The velocity dispersion function of early-type galaxies and its redshift evolution: the newest results from lens redshift test
Liu, Yuting; Cao, Shuo; Biesiada, Marek +3 more
The redshift distribution of galactic-scale lensing systems provides a laboratory to probe the velocity dispersion function (VDF) of early-type galaxies (ETGs) and measure the evolution of ETGs at redshift z ~ 1. Through the statistical analysis of the currently largest sample of ETG gravitational lenses, we conclude that the VDF inferred solely f…
Validation of coronal mass ejection arrival-time forecasts by magnetohydrodynamic simulations based on interplanetary scintillation observations
Tokumaru, Munetoshi; Fujiki, Ken'ichi; Shiota, Daikou +3 more
Coronal mass ejections (CMEs) cause various disturbances of the space environment; therefore, forecasting their arrival time is very important. However, forecasting accuracy is hindered by limited CME observations in interplanetary space. This study investigates the accuracy of CME arrival times at the Earth forecasted by three-dimensional (3D) ma…
PSP/IS⊙IS observations of the 29 November 2020 solar energetic particle event
Mitchell, D. G.; McComas, D. J.; Bale, S. D. +24 more
Aims: On 29 November 2020, at 12:34 UT, active region 12790 erupted with an M4.4 class flare and a 1700 km s−1 coronal mass ejection. Parker Solar Probe (PSP) was completing its seventh orbit around the Sun and was located at 0.8 au when the Integrated Science Investigation of the Sun (IS⊙IS) measured the ensuing mid-sized solar en…
Modeling the mixed-morphology supernova remnant IC 443. Origins of its complex morphology and X-ray emission
Miceli, M.; Bocchino, F.; Orlando, S. +4 more
Context. The morphology and the distribution of material observed in supernova remnants (SNRs) reflect the interaction of the supernova (SN) blast wave with the ambient environment, the physical processes associated with the SN explosion, and the internal structure of the progenitor star. IC 443 is a mixed-morphology (MM) SNR located in a quite co…
STIX X-ray microflare observations during the Solar Orbiter commissioning phase
Massa, Paolo; Krucker, Säm; Piana, Michele +34 more
Context. The Spectrometer/Telescope for Imaging X-rays (STIX) is the hard X-ray instrument onboard Solar Orbiter designed to observe solar flares over a broad range of flare sizes.
Aims: We report the first STIX observations of solar microflares recorded during the instrument commissioning phase in order to investigate the STIX performance at…
Phase-curve Pollution of Exoplanet Transmission Spectra
Lagage, Pierre-Olivier; Morello, Giuseppe; Zingales, Tiziano +2 more
The occurrence of a planet transiting in front of its host star offers the opportunity to observe the planet's atmosphere filtering starlight. The fraction of occulted stellar flux is roughly proportional to the optically thick area of the planet, the extent of which depends on the opacity of the planet's gaseous envelope at the observed wavelengt…
Machine learning initialization to accelerate Stokes profile inversions
Ruiz Cobo, B.; Quintero Noda, C.; Orozco Suárez, D. +3 more
Context. At present, an exponential growth in scientific data from current and upcoming solar observatories is expected. Most of the data consist of high spatial and temporal resolution cubes of Stokes profiles taken in both local thermodynamic equilibrium (LTE) and non-LTE spectral lines. The analysis of such solar observations requires complex i…