The ALMA Lupus protoplanetary disk survey: evidence for compact gas disks and molecular rings from CN

doi:10.1051/0004-6361/201834257

	The ALMA Lupus protoplanetary disk survey: evidence for compact gas disks and molecular rings from CN
	van Terwisga, S. E.1; van Dishoeck, E. F.2; Cazzoletti, P.3; Facchini, S.4; Trapman, L.5; Williams, J. P.6; Manara, C. F.7; Miotello, A.8; van der Marel, N.9; Ansdell, M.10; Hogerheijde, M. R.11; Tazzari, M.12; Testi, L.13
	2019-03-25
发表期刊	ASTRONOMY & ASTROPHYSICS
ISSN	1432-0746
卷号	623
摘要	Context. The cyanide radical CN is abundant in protoplanetary disks, with line fluxes often comparable to those of (CO)-C-13. It is known to be sensitive to UV irradiation of the upper disk atmosphere, with models predicting ring-shaped emission.Aims. We seek to characterize the CN emission from 94 Class-II disks in the Lupus star-forming region, compare it to observations in other regions, and interpret our observations with a grid of models. The CN emission morphology is discussed for two primordial disks, Sz 71 and Sz 98, and is modeled in more detail.Methods. ALMA observed CN N = 3-2 in Lupus disks down to sensitivities better than previous surveys. Models constructed with the physico-chemical code DALI are used to study the integrated fluxes of the disks and resolved emission of CN in disks without (dust) substructures.Results. CN N = 3-2 is bright, and detected in 38% of sources, but its disk-integrated flux is not strongly correlated to either (CO)-C-13 or continuum flux. Compared to pre-ALMA single-dish surveys, no significant difference in the CN flux distributions in Lupus and Taurus-Auriga is found, although rho Ophiuchus disks may be fainter on average. We find ring-shaped CN emission with peak radii of similar to 50 AU in two resolved disks.Conclusions. A large fraction of sources are faint in CN; only exponential gas surface density cutoffs at R-c <= 15 AU can reconcile observations with models. This is the first observational evidence of such a compact gas disk population in Lupus. Absolute intensities and the emission morphology of CN are reproduced by DALI models without the need for any continuum substructure; they are unrelated to the CO snowline location. The observations presented here, together with the modeling of these rings, provide a new probe of the structure and conditions in disks, and particularly their incident UV radiation field, if disk size is determined from the data.
关键词	astrochemistry protoplanetary disks stars: pre-main sequence stars: individual: Sz 98 stars: individual: Sz 71 techniques: interferometric
DOI	10.1051/0004-6361/201834257
收录类别	SCI
语种	英语
WOS关键词	Astronomy & Astrophysics
WOS研究方向	Science & Technology
WOS类目	Astronomy & Astrophysics
WOS记录号	WOS:000462115100001
出版者	EDP SCIENCES S A
引用统计
文献类型	期刊论文
专题	任务一_子任务一循证社会科学证据集成任务一
作者单位	1.Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands 2.Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands 3.Max Planck Inst Extraterr Phys, Giessenbachstr, D-85741 Garching, Germany 4.Max Planck Inst Extraterr Phys, Giessenbachstr, D-85741 Garching, Germany 5.European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany 6.Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands 7.Univ Hawaii Manoa, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA 8.European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany 9.European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany 10.Univ Hawaii Manoa, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA 11.NRC Canada, Herzberg Astron Program, 5017 West Saanich Rd, Victoria, BC V9E 2E7, Canada 12.NRC Canada, Herzberg Astrophys Program, 5017 West Saanich Rd, Victoria, BC V9E 2E7, Canada 13.Univ Hawaii Manoa, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA
推荐引用方式 GB/T 7714	van Terwisga, S. E.,van Dishoeck, E. F.,Cazzoletti, P.,et al. The ALMA Lupus protoplanetary disk survey: evidence for compact gas disks and molecular rings from CN[J]. ASTRONOMY & ASTROPHYSICS,2019,623.
APA	van Terwisga, S. E..,van Dishoeck, E. F..,Cazzoletti, P..,Facchini, S..,Trapman, L..,...&Testi, L..(2019).The ALMA Lupus protoplanetary disk survey: evidence for compact gas disks and molecular rings from CN.ASTRONOMY & ASTROPHYSICS,623.
MLA	van Terwisga, S. E.,et al."The ALMA Lupus protoplanetary disk survey: evidence for compact gas disks and molecular rings from CN".ASTRONOMY & ASTROPHYSICS 623(2019).