2024A&A...688L..15F

Query : 2024A&A...688L..15F

2024A&A...688L..15F - Astronomy and Astrophysics, volume 688L15 (2024/8-1)

Discovery of HCCCH₂CCH in TMC-1 with the QUIJOTE line survey.

FUENTETAJA R., AGUNDEZ M., CABEZAS C., TERCERO B., MARCELINO N., PARDO J.R., DE VICENTE P. and CERNICHARO J.

Abstract (from CDS):

We present the first detection in space of 1,4-pentadiyne. It has been found towards TMC-1 with the QUIJOTE line survey in the 31-50 GHz range. We observed a total of 17 transitions with J = 2 up to 13 and K_a = 0, 1 and 2. The observed transitions allowed us to derive a rotational temperature of 9.5 ± 0.5 K and a column density of (5.0 ± 0.5) × 10¹² cm^–2. This molecule was the last non-cyclic isomer of the C₅H₄ family that could be detected via radio astronomy. A computational chemistry study was performed to determine the energies of the five most stable isomers. The isomer (c-C₃H₃CCH) has a considerably higher energy than the others, and it has not yet been detected. To better understand the chemical reactions involving these species, we compared the ethynyl and cyano derivatives. The observed abundances of these species are in good agreement with the branching ratios of the formation reactions studied with our chemical model of TMC-1.

Abstract Copyright: © The Authors 2024

Journal keyword(s): astrochemistry - line: identification - molecular data - ISM: molecules - ISM: individual objects: TMC-1

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	TMC-1	MoC	04 41 45.9	+25 41 27						~	1872	0

Query : 2024A&A...688L..15F

Basic data :

TMC-1 -- Molecular Cloud
Other object types:	`PoC (MLB,[MOH94])`, `MoC (TMC)`, `Cld (HCL)`
ICRS coord. (ep=J2000) :	`04 41 45.9 +25 41 27 [ ] D 1983ApJ...264..517M`
FK4 coord. (ep=B1950 eq=1950) :	`04 38 42.0 +25 35 45 [ ]`
Gal coord. (ep=J2000) :	`174.3852 -13.4312 [ ]`

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HCL 2 MLB 3-28 TMC-1 [MOH94] 6

References (1872 between 1850 and 2026) (Total 1872)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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