The interstellar medium is characterized by a rich and diverse chemistry. Many of its
complex organic molecules are proposed to form through radical chemistry in icy grain …

Our Sun and planetary system were born about 4.5 billion years ago. How did this happen,
and what is the nature of our heritage from these early times? This review tries to address …

Planets form and obtain their compositions in dust-and gas-rich disks around young stars,
and the outcome of this process is intimately linked to the disk chemical properties. The …

A new collection of photodissociation and photoionisation cross sections for 102 atoms and
molecules of astrochemical interest has been assembled, along with a brief review of the …

Observations of comets and asteroids show that the solar nebula that spawned our
planetary system was rich in water and organic molecules. Bombardment brought these …

Aims. Photodissociation by UV light is an important destruction mechanism for carbon
monoxide (CO) in many astrophysical environments, ranging from interstellar clouds to …

▪ Abstract Until the late 1990s the rich Hyades and the sparse UMa clusters were the only
coeval, comoving concentrations of stars known within 60 pc of Earth. Both are hundreds of …

We report observations of resolved C 2 H emission rings within the gas-rich protoplanetary
disks of TW Hya and DM Tau using the Atacama Large Millimeter Array. In each case the …

Abstract We present Hubble Space Telescope ultraviolet spectra and supporting ground-
based data for a sample of nine intermediate-mass T Tauri stars (IMTTSs; 1.5–4 M⊙). The …

We calculate the rate of photoevaporation of a circumstellar disk by energetic radiation (far-
UV (FUV), 6 eV< hν< 13.6 eV; extreme-UV (EUV), 13.6 eV< hν< 0.1 keV; and X-rays, hν> 0.1 …