Discovery of SiCSi in IRC+10216: A missing link between gas and dust carriers of Si-C bonds

J. Cernicharo; M. C. McCarthy; C. A. Gottlieb; M. Agúndez; L. Velilla Prieto; J. H. Baraban; P. B. Changala; M. Guélin; C. Kahane; M. A. Martin-Drumel; N. A. Patel; N. J. Reilly; J. F. Stanton; G. Quintana-Lacaci; S. Thorwirth; K. H. Young

doi:https://doi.org/10.1088/2041-8205/806/1/L3

Discovery of SiCSi in IRC+10216: A missing link between gas and dust carriers of Si-C bonds

J. Cernicharo, M. C. McCarthy, C. A. Gottlieb, M. Agúndez, L. Velilla Prieto, J. H. Baraban, P. B. Changala, M. Guélin, C. Kahane, M. A. Martin-Drumel, N. A. Patel, N. J. Reilly, J. F. Stanton, G. Quintana-Lacaci, S. Thorwirth, K. H. Young

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Abstract

We report the discovery in space of a disilicon species, SiCSi, from observations between 80 and 350 GHz with the IRAM 30 m radio telescope. Owing to the close coordination between laboratory experiments and astrophysics, 112 lines have now been detected in the carbon-rich star CW Leo. The derived frequencies yield improved rotational and centrifugal distortion constants up to sixth order. From the line profiles and interferometric maps with the Submillimeter Array, the bulk of the SiCSi emission arises from a region of 6″ in radius. The derived abundance is comparable to that of SiC₂. As expected from chemical equilibrium calculations, SiCSi and SiC₂ are the most abundant species harboring a Si-C bond in the dust formation zone and certainly both play a key role in the formation of SiC dust grains.

Original language	American English
Article number	L3
Journal	Astrophysical Journal Letters
Volume	806
Issue number	1
DOIs	https://doi.org/10.1088/2041-8205/806/1/L3
State	Published - 10 Jun 2015
Externally published	Yes

Keywords

astrochemistry
stars: AGB and post-AGB
stars: carbon
stars: individual (IRC 10216)

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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https://doi.org/10.1088/2041-8205/806/1/L3

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Cernicharo, J., McCarthy, M. C., Gottlieb, C. A., Agúndez, M., Prieto, L. V., Baraban, J. H., Changala, P. B., Guélin, M., Kahane, C., Martin-Drumel, M. A., Patel, N. A., Reilly, N. J., Stanton, J. F., Quintana-Lacaci, G., Thorwirth, S., & Young, K. H. (2015). Discovery of SiCSi in IRC+10216: A missing link between gas and dust carriers of Si-C bonds. Astrophysical Journal Letters, 806(1), Article L3. https://doi.org/10.1088/2041-8205/806/1/L3

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title = "Discovery of SiCSi in IRC+10216: A missing link between gas and dust carriers of Si-C bonds",

abstract = "We report the discovery in space of a disilicon species, SiCSi, from observations between 80 and 350 GHz with the IRAM 30 m radio telescope. Owing to the close coordination between laboratory experiments and astrophysics, 112 lines have now been detected in the carbon-rich star CW Leo. The derived frequencies yield improved rotational and centrifugal distortion constants up to sixth order. From the line profiles and interferometric maps with the Submillimeter Array, the bulk of the SiCSi emission arises from a region of 6″ in radius. The derived abundance is comparable to that of SiC2. As expected from chemical equilibrium calculations, SiCSi and SiC2 are the most abundant species harboring a Si-C bond in the dust formation zone and certainly both play a key role in the formation of SiC dust grains.",

keywords = "astrochemistry, stars: AGB and post-AGB, stars: carbon, stars: individual (IRC 10216)",

author = "J. Cernicharo and McCarthy, {M. C.} and Gottlieb, {C. A.} and M. Ag{\'u}ndez and Prieto, {L. Velilla} and Baraban, {J. H.} and Changala, {P. B.} and M. Gu{\'e}lin and C. Kahane and Martin-Drumel, {M. A.} and Patel, {N. A.} and Reilly, {N. J.} and Stanton, {J. F.} and G. Quintana-Lacaci and S. Thorwirth and Young, {K. H.}",

year = "2015",

month = jun,

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Cernicharo, J, McCarthy, MC, Gottlieb, CA, Agúndez, M, Prieto, LV, Baraban, JH, Changala, PB, Guélin, M, Kahane, C, Martin-Drumel, MA, Patel, NA, Reilly, NJ, Stanton, JF, Quintana-Lacaci, G, Thorwirth, S & Young, KH 2015, 'Discovery of SiCSi in IRC+10216: A missing link between gas and dust carriers of Si-C bonds', Astrophysical Journal Letters, vol. 806, no. 1, L3. https://doi.org/10.1088/2041-8205/806/1/L3

TY - JOUR

T1 - Discovery of SiCSi in IRC+10216

T2 - A missing link between gas and dust carriers of Si-C bonds

AU - Cernicharo, J.

AU - McCarthy, M. C.

AU - Gottlieb, C. A.

AU - Agúndez, M.

AU - Prieto, L. Velilla

AU - Baraban, J. H.

AU - Changala, P. B.

AU - Guélin, M.

AU - Kahane, C.

AU - Martin-Drumel, M. A.

AU - Patel, N. A.

AU - Reilly, N. J.

AU - Stanton, J. F.

AU - Quintana-Lacaci, G.

AU - Thorwirth, S.

AU - Young, K. H.

PY - 2015/6/10

Y1 - 2015/6/10

N2 - We report the discovery in space of a disilicon species, SiCSi, from observations between 80 and 350 GHz with the IRAM 30 m radio telescope. Owing to the close coordination between laboratory experiments and astrophysics, 112 lines have now been detected in the carbon-rich star CW Leo. The derived frequencies yield improved rotational and centrifugal distortion constants up to sixth order. From the line profiles and interferometric maps with the Submillimeter Array, the bulk of the SiCSi emission arises from a region of 6″ in radius. The derived abundance is comparable to that of SiC2. As expected from chemical equilibrium calculations, SiCSi and SiC2 are the most abundant species harboring a Si-C bond in the dust formation zone and certainly both play a key role in the formation of SiC dust grains.

AB - We report the discovery in space of a disilicon species, SiCSi, from observations between 80 and 350 GHz with the IRAM 30 m radio telescope. Owing to the close coordination between laboratory experiments and astrophysics, 112 lines have now been detected in the carbon-rich star CW Leo. The derived frequencies yield improved rotational and centrifugal distortion constants up to sixth order. From the line profiles and interferometric maps with the Submillimeter Array, the bulk of the SiCSi emission arises from a region of 6″ in radius. The derived abundance is comparable to that of SiC2. As expected from chemical equilibrium calculations, SiCSi and SiC2 are the most abundant species harboring a Si-C bond in the dust formation zone and certainly both play a key role in the formation of SiC dust grains.

KW - astrochemistry

KW - stars: AGB and post-AGB

KW - stars: carbon

KW - stars: individual (IRC 10216)

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DO - https://doi.org/10.1088/2041-8205/806/1/L3

M3 - Article

C2 - 26722621

SN - 2041-8205

VL - 806

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 1

M1 - L3

ER -

Discovery of SiCSi in IRC+10216: A missing link between gas and dust carriers of Si-C bonds

Abstract

Keywords

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