We report Atacama Large Millimeter/submillimeter Array (ALMA) observations of polarized dust emission from the protostellar source Ser-emb 8 at a linear resolution of 140AU. Assuming models of dust-grain alignment hold, the observed polarization pattern gives a projected view of the magnetic field structure in this source. Contrary to expectations based on models of strongly magnetized star for...

Exoplanets display incredible diversity, from planetary system architectures around Sun-like stars that are very different to our Solar System, planets orbiting post-main sequence or stellar remnants. Recently the B-star Exoplanet Abundance STudy (BEAST) reported discovery of at least two super-Jovian massive in Sco Cen OB association. Whilst such do have Keplerian discs, it is hard envisage ga...

Protoplanetary discs are crucial to understanding how planets form and evolve, but these objects subject the vagaries of birth environments their host stars. In particular, photoionising radiation from massive stars has been shown be an effective agent in disrupting protoplanetary discs. External photoevaporation leads inward evolution radii discs, whereas internal viscous disc causes evolve ou...

We investigate in this paper the effect of gas drag on the dynamics of the dust particles in the edge-on β Pictoris disc in order to derive an upper limit on the mass of gas in this system. Our study is motivated by the large uncertainties on the amount of gas in the β Pictoris disc currently found in the literature. The dust particles are assumed to originate from a colliding annulus of planet...

Many recent observational studies have concluded that planetary systems commonly exist in multiple-star systems. At least ∼ 20% of the known extrasolar planetary systems are associated with one or more stellar companions. The orbits of stellar binaries hosting planetary systems are typically wider than 100AU and often highly inclined with respect to the planetary orbits. The effect of secular p...

Evidence for a transitional stage in the formation of a low-mass star is reported, intermediate between the fully embedded and the T Tauri phases. Millimeter aperture synthesis observations in the HCO J=1–0 and 3–2, HCN 1–0, CO 1–0, and CO 1– 0 transitions reveal distinctly different velocity fields around two embedded, low-mass young stellar objects. The 0.6 M⊙ of material around TMC 1 (IRAS 0...

ABSTRACT The question of what determines the width Kuiper belt analogues (exoKuiper belts) is an open one. If solved, this understanding would provide valuable insights into architecture, dynamics, and formation exoplanetary systems. Recent observations by ALMA have revealed apparent paradox in field, presence radially narrow belts protoplanetary discs that are likely birthplaces planetesimals,...

M-stars are the most common hosts of planetary systems in Galaxy. Protoplanetary disks around thus offer a prime opportunity to study chemistry planet-forming environments. We present an ALMA survey molecular line emission toward sample five protoplanetary M4-M5 stars (FP Tau, J0432+1827, J1100-7619, J1545-3417, and Sz 69). These observations can resolve chemical structures down tens AU. Molecu...

It is now clear that there is a substantial population of primordial binaries in galactic globular clusters and that binary interactions are a major influence on globular cluster evolution. Collisional interactions involving stars in binaries may provide a significant channel for the formation of various stellar exotica, such as blue stragglers, X–ray binaries and millisecond pulsars. We report...

The circumstellar dust disk of the Herbig Ae star AB Aur has been found to exhibit complex spiral-like structures in the near-IR image obtained with the Subaru Telescope. We present maps of the disk in both CO (3-2) and dust continuum at 345 GHz with the SMA at an angular resolution of 1 .0 × 0.7(144AU × 100AU). The continuum emission traces a dust disk with a central depression and a maximum o...