Search Publications
A rogues gallery of Andromeda's dwarf galaxies - II. Precise distances to 17 faint satellites
Lewis, Geraint F.; Dolphin, Andrew E.; Skillman, Evan D. +8 more
We present new horizontal branch (HB) distance measurements to 17 of the faintest known M31 satellites (-6 ≲ MV ≲ -13) based on deep Hubble Space Telescope (HST) imaging. The colour-magnitude diagrams extend ∼1-2 mag below the HB, which provides for well-defined HBs, even for faint galaxies in which the tip of the red giant branch (TRGB…
HD 99458: First time ever Ap-type star as a δ Scuti pulsator in a short period eclipsing binary?
Sabotta, S.; Paunzen, E.; Skarka, M. +18 more
We present the discovery of a unique object, a chemically peculiar Ap-type star showing δ Scuti pulsations that is bound in an eclipsing binary system with an orbital period shorter than 3 d. HD 99458 is therefore a complex astrophysical laboratory opening doors for studying various, often contradictory, physical phenomena at the same time. It is …
Supergranular turbulence in the quiet Sun: Lagrangian coherent structures
Miranda, Rodrigo A.; Chian, Abraham C. -L.; Kusano, Kanya +6 more
The quiet Sun exhibits a wealth of magnetic activities that are fundamental for our understanding of solar magnetism. The magnetic fields in the quiet Sun are observed to evolve coherently, interacting with each other to form prominent structures as they are advected by photospheric flows. The aim of this paper is to study supergranular turbulence…
GIARPS High-resolution Observations of T Tauri stars (GHOsT). I. Jet line emission
Munari, U.; Bacciotti, F.; Fedele, D. +9 more
Context. The mechanism for jet formation in the disks of T Tauri stars remains poorly understood. Observational benchmarks to launching models can be provided by tracing the physical properties of the kinematic components of the wind and jet in the inner 100 au of the disk surface.
Aims: In the framework of the GIARPS High-resolution Observat…
The Massive Star-forming Regions Omnibus X-ray Catalog, Third Installment
Garmire, Gordon P.; Townsley, Leisa K.; Broos, Patrick S. +1 more
We offer to the star formation community the third installment of the Massive Star-forming Regions (MSFRs) Omnibus X-ray Catalog (MOXC3), a compilation of X-ray point sources detected in 50 archival Chandra Advanced CCD Imaging Spectrometer observations of 14 Galactic MSFRs and surrounding fields. The MOXC3 MSFRs are NGC 2264, NGC 6193, RCW 108-IR…
Testing of the Taylor Frozen-in-flow Hypothesis at Electron Scales in the Solar Wind Turbulence
Sahraoui, F.; Huang, S. Y.
In single-spacecraft observations the Taylor frozen-in-flow hypothesis is usually used to infer wavenumber spectra of turbulence from the frequency ones. While this hypothesis can be valid at MHD scales in the solar wind because of the small phase speeds of the fluctuations in comparison with the solar wind flow speed, its validity at electron sca…
System initial mass function of the 25 Ori group from planetary-mass objects to intermediate/high-mass stars
Petr-Gotzens, Monika G.; Suárez, Genaro; Briceño, César +4 more
The stellar initial mass function (IMF) is an essential input for many astrophysical studies but only in a few cases has it been determined over the whole cluster mass range, limiting the conclusions about its nature. The 25 Orionis group (25 Ori) is an excellent laboratory for investigating the IMF across the entire mass range of the population, …
Identifying Young Stellar Objects in the Outer Galaxy: l = 224° Region in Canis Major
Boyer, Martha L.; Szczerba, Ryszard; Elia, Davide +14 more
We study a very young star-forming region in the outer Galaxy that is the most concentrated source of outflows in the Spitzer Space Telescope GLIMPSE360 survey. This region, dubbed CMa-l224, is located in the Canis Major OB1 association. CMa-l224 is relatively faint in the mid-infrared, but it shines brightly at the far-infrared wavelengths as rev…
Diagnosing 0.1-10 au Scale Morphology of the FU Ori Disk Using ALMA and VLTI/GRAVITY
Henning, Thomas; Mérand, Antoine; Takami, Michihiro +11 more
We report new Atacama Large Millimeter/submillimeter Array Band 3 (86-100 GHz; ∼80 mas angular resolution) and Band 4 (146-160 GHz; ∼50 mas angular resolution) observations of the dust continuum emission toward the archetypal and ongoing accretion burst young stellar object FU Ori, which simultaneously covered its companion, FU Ori S. In addition,…
WASP-South hot Jupiters: WASP-178b, WASP-184b, WASP-185b, and WASP-192b
Bouchy, F.; Queloz, D.; Hellier, Coel +19 more
We report on four new transiting hot Jupiters discovered by the WASP-South survey. WASP-178b transits a V = 9.9, A1V star with Teff = 9350 ± 150 K, the second-hottest transit host known. It has a highly bloated radius of 1.81 ± 0.09 RJup, in line with the known correlation between high irradiation and large size. With an esti…