Cumulene carbenes in TMC-1: Astronomical discovery of -HC .

We report the first detection in space of the cumulene carbon chain -HC. A total of eleven rotational transitions, with = 7-10 and = 0 and 1, were detected in TMC-1 in the 31.0-50.

The sulphur saga in TMC-1: Discovery of HCSCN and HCSCCH.

We report the detection, for the first time in space, of cyano thioformaldehyde (HCSCN) and propynethial (HCSCCH) towards the starless core TMC-1. Cyano thioformaldehyde presents a series of prominent - and -type lines, which are the strongest previously unassigned features in our Q-band line survey of TMC-1. Remarkably, HCSCN is four times more abundant than cyano formaldehyde (HCOCN).

O-bearing complex organic molecules at the cyanopolyyne peak of TMC-1: detection of CHCHO, CHOH, HCOOCH, and CHOCH.

We report the detection of the oxygen-bearing complex organic molecules propenal (CHCHO), vinyl alcohol (CHOH), methyl formate (HCOOCH), and dimethyl ether (CHOCH) toward the cyanopolyyne peak of the starless core TMC-1. These molecules are detected through several emission lines in a deep Q-band line survey of TMC-1 carried out with the Yebes 40m telescope. These observations reveal that the cyanopolyyne peak of TMC-1, which is the prototype of cold dark cloud rich in carbon chains, contains also O-bearing complex organic molecules like HCOOCH and CHOCH, which have been previously seen in a handful of cold interstellar clouds.

First detection of doubly deuterated methyl acetylene (CHDCCH and CHDCCD).

We report the first detection in space of the two doubly deuterated isotopologues of methyl acetylene. The species CHDCCH and CHDCCD were identified in the dense core L483 through nine and eight, respectively, rotational lines in the 72-116 GHz range using the IRAM 30m telescope. The astronomical frequencies observed here were combined with laboratory frequencies from the literature measured in the 29-47 GHz range to derive more accurate spectroscopic parameters for the two isotopologues.

Detection of deuterated methylcyanoacetylene, CHDCN, in TMC-1.

We report the first detection in space of the single deuterated isotopologue of methylcyanoacetylene, CHDCN. A total of fifteen rotational transitions, with = 8-12 and = 0 and 1, were identified for this species in TMC-1 in the 31.0-50.