2012ApJ...746...97S

Query : 2012ApJ...746...97S

2012ApJ...746...97S - Astrophys. J., 746, 97 (2012/February-2)

Characterizing CO fourth positive emission in young circumstellar disks.

SCHINDHELM E., FRANCE K., BURGH E.B., HERCZEG G.J., GREEN J.C., BROWN A., BROWN J.M. and VALENTI J.A.

Abstract (from CDS):

Carbon monoxide is a commonly used IR/submillimeter tracer of gas in protoplanetary disks. We present an analysis of ultraviolet CO emission in Hubble Space Telescope Cosmic Origins Spectrograph spectra for 12 Classical T Tauri stars (CTTSs). Several ro-vibrational bands of the CO A 1Π-X 1Σ+ (Fourth Positive) electronic transition system are spectrally resolved from emission of other atoms and H2. The CO A 1Π v' = 14 state is populated by absorption of Lyα photons, created at the accretion column on the stellar surface. For targets with strong CO emission, we model the Lyα radiation field as an input for a simple fluorescence model to estimate CO rotational excitation temperatures and column densities. Typical column densities range from NCO= 1018 to 1019/cm2. Our measured excitation temperatures are mostly below TCO= 600 K, cooler than typical M-band CO emission. These temperatures and the emission line widths imply that the UV emission originates in a different population of CO than that which is IR-emitting. We also find a significant correlation between CO emission and the disk accretion rate {dot}M and age. Our analysis shows that ultraviolet CO emission can be a useful diagnostic of CTTS disk gas.

Abstract Copyright: ∼

Journal keyword(s): protoplanetary disks K stars: individual (RECX 15, DM Tau, DE Tau, HD 135344B, DR Tau, DK Tau, DF Tau, LkCa 15, GM Aur)

Simbad objects: 21

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Number of rows : 21
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 V* DE Tau Or* 04 21 55.6347850824 +27 55 06.184016436 15.18 15.13 13.80     M3Ve 286 0
2 V* DF Tau TT* 04 27 02.7932020080 +25 42 22.453341516 11.97 12.25 11.42 10.31 9.14 M3Ve 528 1
3 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1453 0
4 V* DK Tau A Or* 04 30 44.2408811328 +26 01 24.734232948           K5Ve 271 0
5 V* DK Tau Or* 04 30 44.243376 +26 01 24.65328 13.32 14.59 13.05 12.08   K7e+K7e 350 0
6 V* HN Tau B TT* 04 33 39.2226918336 +17 51 49.874296644     18.1     M4e 36 0
7 V* HN Tau Or* 04 33 39.3629421552 +17 51 52.289234280   14.76 13.40 13.05   K5e 271 0
8 V* DM Tau Or* 04 33 48.7336763736 +18 10 09.973460280 14.30 14.82 14.00     M2Ve 731 0
9 V* AA Tau Or* 04 34 55.4201902392 +24 28 53.033624580 13.14 13.34 12.20 12.03   K5Ve 801 0
10 EM* LkCa 15 Or* 04 39 17.7911622816 +22 21 03.390090984   13.01 12.03 11.61   K5:Ve 792 1
11 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
12 V* DR Tau Or* 04 47 06.2151561264 +16 58 42.813872580 12.03 11.86 10.50 12.19   K5Ve 585 0
13 V* GM Aur Or* 04 55 10.9815576936 +30 21 59.373771876 14.59 13.351 12.242 11.798   K3Ve 797 0
14 V* EG Cha Or* 08 36 56.2143359952 -78 56 45.633633000   11.82 10.457   9.010 K4Ve 110 0
15 * eta Cha Pu* 08 41 19.5125857944 -78 57 48.105898056 5.02 5.351 5.453     B8V 246 0
16 Cl Mamajek 1 OpC 08 42 32.9 -78 57 47           ~ 392 0
17 V* ET Cha Or* 08 43 18.5853516024 -79 05 18.232481832     13.97     M4.0 99 0
18 V* EP Cha Or* 08 47 01.6439909496 -78 59 34.380161016     11.1     K5IVe 109 0
19 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 2144 1
20 HD 135344B Or* 15 15 48.4460065200 -37 09 16.024369824   9.21 8.708     F8V 548 0
21 HD 319139 SB* 18 14 10.4818675368 -32 47 34.516836060   11.47 10.68   9.11 K5+K7 423 0

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