2012A&A...538A..57A


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.20CET02:11:47

2012A&A...538A..57A - Astronomy and Astrophysics, volume 538A, 57-57 (2012/2-1)

AKARI observations of ice absorption bands towards edge-on young stellar objects.

AIKAWA Y., KAMURO D., SAKON I., ITOH Y., TERADA H., NOBLE J.A., PONTOPPIDAN K.M., FRASER H.J., TAMURA M., KANDORI R., KAWAMURA A. and UENO M.

Abstract (from CDS):

Circumstellar disks and envelopes of low-mass young stellar objects (YSOs) contain significant amounts of ice. Such icy material will evolve to become volatile components of planetary systems, such as comets in our solar system. To investigate the composition and evolution of circumstellar ice around low-mass young stellar objects (YSOs), we observed ice absorption bands in the near infrared (NIR) towards eight YSOs ranging from class 0 to class II, among which seven are associated with edge-on disks. We performed slit-less spectroscopic observations using the grism mode of the InfraRed Camera (IRC) on board AKARI, which enables us to obtain full NIR spectra from 2.5µm to 5µm, including the CO2 band and the blue wing of the H2O band, which are inaccessible from the ground. We developed procedures to carefully process the spectra of targets with nebulosity. The spectra were fitted with polynomial baselines to derive the absorption spectra. The molecular absorption bands were then fitted with the laboratory database of ice absorption bands, considering the instrumental line profile and the spectral resolution of the grism dispersion element. Towards the class 0-I sources (L1527, IRC-L1041-2, and IRAS04302), absorption bands of H2O, CO2, CO, and XCN are clearly detected. Column density ratios of CO2 ice and CO ice relative to H2O ice are 21-28% and 13-46%, respectively. If XCN is OCN, its column density is as high as 2-6% relative to H2O ice. The HDO ice feature at 4.1µm is tentatively detected towards the class 0-I sources and HV Tau. Non-detections of the CH-stretching mode features around 3.5 µm provide upper limits to the CH3OH abundance of 26% (L1527) and 42% (IRAS04302) relative to H2O. We tentatively detect OCS ice absorption towards IRC-L1041-2. Towards class 0-I sources, the detected features should mostly originate in the cold envelope, while CO gas and OCN could originate in the region close to the protostar, where there are warm temperatures and UV radiation. We detect H2O ice band towards ASR41 and 2MASSJ1628137-243139, which are edge-on class II disks. We also detect H2O ice and CO2 ice towards HV Tau, HK Tau, and UY Aur, and tentatively detect CO gas features towards HK Tau and UY Aur.

Abstract Copyright:

Journal keyword(s): circumstellar matter - infrared: ISM - stars: formation - astrochemistry

Simbad objects: 20

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Number of rows : 20

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 2MASS J03285129+3117397 Y*O 03 28 51.291 +31 17 39.79           ~ 22 0
2 LDN 1521D DNe 04 27 46.5 +26 18 52           ~ 214 0
3 V* HK Tau TT* 04 31 50.5722969258 +24 24 17.775488652 16.81   15.10     M0.5 293 1
4 NAME HK Tau B TT* 04 31 50.58 +24 24 16.4           M1 65 0
5 IRAS 04302+2247 Y*O 04 33 16.501 +22 53 20.40           ~ 133 0
6 NAME HV Tau AB Y*O 04 38 35.2903493114 +26 10 38.646251388           M1Ve 96 0
7 V* HV Tau TT* 04 38 35.3 +26 10 39           M4.1 107 0
8 NAME HV Tau C TT* 04 38 35.5121708248 +26 10 41.334466864         14.90 K6 84 0
9 LDN 1527 DNe 04 39 53 +25 45.0           ~ 478 0
10 IRAS 04368+2557 Y*O 04 39 53.86 +26 03 09.7           ~ 229 0
11 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3374 0
12 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1337 0
13 V* UY Aur TT* 04 51 47.3900418279 +30 47 13.552212742 12.82 12.96 11.90 10.59 9.52 M0e+M2.5e 324 0
14 HD 142527 Ae* 15 56 41.8888096574 -42 19 23.245384377   9.04 8.34     F6III 440 1
15 CRBR 2422.8-3423 Y*O 16 27 24.61320 -24 41 03.4080           ~ 79 1
16 BKLT J162813-243139 Y*O 16 28 13.74000 -24 31 39.4608           ~ 42 0
17 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1013 1
18 HBC 650 TT* 16 34 29.32 -15 47 01.4           K3.0 164 2
19 [LM99] L1041-2 cor 20 37 17.7 +57 49 21           ~ 14 0
20 LDN 1041 DNe 20 38.2 +57 31           ~ 8 0

    Equat.    Gal    SGal    Ecl

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2020.02.20-02:11:47

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