In:
Proceedings of the International Astronomical Union, Cambridge University Press (CUP), Vol. 4, No. S251 ( 2008-02), p. 127-128
Abstract:
We use Spitzer IRS spectra to determine the solid CH 4 abundance toward a large sample (52 sources) of low mass protostars. 50% of the sources have an absorption feature at 7.7 μm, attributed to solid CH 4 . The solid CH 4 /H 2 O abundances are 2–13%, but toward sources with H 2 O column densities above 2 × 10 18 cm −2 , the CH 4 abundances (20 out of 25) are nearly constant at 4.7 ± 1.6%. Correlations with CO 2 and H 2 O together with the inferred abundances are consistent with CH 4 formation through sequential hydrogenation of C on grain surfaces, but not with formation from CH 3 OH and formation in gas phase with subsequent freeze-out.
Type of Medium:
Online Resource
ISSN:
1743-9213
,
1743-9221
DOI:
10.1017/S1743921308021352
Language:
English
Publisher:
Cambridge University Press (CUP)
Publication Date:
2008
detail.hit.zdb_id:
2170724-8
SSG:
16,12
Permalink