2010A&A...521L..31V

Query : 2010A&A...521L..31V

2010A&A...521L..31V - Astronomy and Astrophysics, volume 521L31-31 (2010/10-1)

Ortho-to-para ratio of interstellar heavy water.

VASTEL C., CECCARELLI C., CAUX E., COUTENS A., CERNICHARO J., BOTTINELLI S., DEMYK K., FAURE A., WIESENFELD L., SCRIBANO Y., BACMANN A., HILY-BLANT P., MARET S., WALTERS A., BERGIN E.A., BLAKE G.A., CASTETS A., CRIMIER N., DOMINIK C., ENCRENAZ P., GERIN M., HENNEBELLE P., KAHANE C., KLOTZ A., MELNICK G., PAGANI L., PARISE B., SCHILKE P., WAKELAM V., BAUDRY A., BELL T., BENEDETTINI M., BOOGERT A., CABRIT S., CASELLI P., CODELLA C., COMITO C., FALGARONE E., FUENTE A., GOLDSMITH P.F., HELMICH F., HENNING T., HERBST E., JACQ T., KAMA M., LANGER W., LEFLOCH B., LIS D., LORD S., LORENZANI A., NEUFELD D., NISINI B., PACHECO S., PEARSON J., PHILLIPS T., SALEZ M., SARACENO P., SCHUSTER K., TIELENS X., VAN DER TAK F., VAN DER WIEL M.H.D., VITI S., WYROWSKI F., YORKE H., CAIS P., KRIEG J.-M., OLBERG M. and RAVERA L.

Abstract (from CDS):

Despite the low elemental deuterium abundance in the Galaxy, enhanced molecular D/H ratios have been found in the environments of low-mass star-forming regions, and in particular the Class 0 protostar IRAS 16293-2422. The CHESS (Chemical HErschel Surveys of Star forming regions) key program aims to study the molecular complexity of the interstellar medium. The high sensitivity and spectral resolution of the Herschel/HIFI instrument provide a unique opportunity to observe the fundamental 1_1,1-0_0,0 transition of the ortho-D₂O molecule, which is inaccessible from the ground, and determine the ortho-to-para D₂O ratio. We detected the fundamental transition of the ortho-D₂O molecule at 607.35GHz towards IRAS 16293-2422. The line is seen in absorption with a line opacity of 0.62±0.11 (1σ). From the previous ground-based observations of the fundamental 1_1,0-1_0,1 transition of para-D₂O seen in absorption at 316.80GHz, we estimate a line opacity of 0.26±0.05 (1σ). We show that the observed absorption is caused by the cold gas in the envelope of the protostar. Using these new observations, we estimate for the first time the ortho-to-para D₂O ratio to be lower than 2.6 at a 3σ level of uncertainty, which should be compared with the thermal equilibrium value of 2:1.

Abstract Copyright: ∼

Journal keyword(s): astrochemistry - ISM: molecules - submillimeter: ISM - ISM: abundances - molecular processes - line: identification

Simbad objects: 1

Full paper

View the references in ADS

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	IRAS 16293-2422	cor	16 32 22.56	-24 28 31.8						~	1357	1

Query : 2010A&A...521L..31V

Basic data :

IRAS 16293-2422 -- Dense Core
Other object types:	`smm (2008ApJ,JCMTLSG,...)`, `IR (2013ApJS,HGBS,...)`, `MIR (SSTc2d,WISEA,...)`, `YO (2015MNRAS,[EES2009])`, `Y? (2015ApJS,[HL2013])`, `mm (2009ApJ,[YEE2006])`, `cor (2020A&A)`, `PoC ([FST86])`
ICRS coord. (ep=J2000) :	`16 32 22.56 -24 28 31.8 (Infrared) [ 300 300 90 ] C 2009ApJ...692..973E`
FK4 coord. (ep=B1950 eq=1950) :	`16 29 20.71 -24 22 11.7 [ 300 300 90 ]`
Gal coord. (ep=J2000) :	`353.93571 +15.84097 [ 300 300 90 ]`
Angular size (arcmin):	`0.35 0.13 136 (FIR) C` `2020A&A...638A..74L`

Overlay

points in this preview

2MASS DSS

All

(CDSPortal)

Send to

Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

An access of full data is available using the icon Vizier near the identifier of the catalogue

`HGBS J163223.1-242836`	`NAME IRAS 16293`	`WISE J163222.62-242833.6`	`[JJK2008] SMM J163223-24284`
`IRAS 16293-2422`	`NAME rho Oph East`	`[EDJ2009] 1008`	`[NWA2006] SMM 20`
`JCMTLSG J163222.6-242833`	`SSTc2d J163222.6-242832`	`[EES2009] Oph-emb 2`	`[YEE2006] 37`
`JCMTSE J163222.8-242837`	`SSTc2d J163222.6-242831`	`[FST86] rho Oph E`
`JCMTSF J163222.8-242837`	`WISEA J163222.60-242833.6`	`[HL2013] 248.09427-24.47550`

References (1357 between 1850 and 2026) (Total 1357)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

Follow new references on this object

Observing logs

External archives :

Data at NED - NASA/IPAC Extragalactic Database : IRAS 16293-2422

Link by name to the catalogue in VizieR :

IRAS 16293-2422 WISEA J163222.60-242833.6 WISE J163222.62-242833.6

Search by coordinates in Vizier (radius: 5 arcsec)

Annotations :
Annotations allow a user to add a note or report an error concerning the astronomical object and its data. It requires registration to post a note. See description .
Please, have a look at Best practices. The list of all annotations to SIMBAD objects can be found here .

The annotation server is currently not available. Sorry for any inconvenience

To bookmark this query, right click on this link: simbad:objects in 2010A&A...521L..31V and select 'bookmark this link' or equivalent in the popup menu