J/ApJ/762/128 Spitzer/IRS disk parameters in Serpens (Oliveira+, 2013)
The physical structure of protoplanetary disks: the Serpens cluster compared
with other regions.
Oliveira I., Merin B., Pontoppidan K.M., van Dishoeck E.F.
<Astrophys. J., 762, 128 (2013)>
=2013ApJ...762..128O 2013ApJ...762..128O (SIMBAD/NED BibCode)
ADC_Keywords: Molecular clouds ; Spectra, infrared ; YSOs ; Spectral types ;
Stars, masses ; Stars, ages ; Effective temperatures
Keywords: circumstellar matter; methods: statistical; planetary systems;
protoplanetary disks; stars: pre-main sequence
Abstract:
Spectral energy distributions are presented for 94 young stars
surrounded by disks in the Serpens Molecular Cloud, based on
photometry and Spitzer/IRS spectra. Most of the stars have
spectroscopically determined spectral types. Taking a distance to the
cloud of 415pc rather than 259pc, the distribution of ages is shifted
to lower values, in the 1-3Myr range, with a tail up to 10Myr. The
mass distribution spans 0.2-1.2M☉, with median mass of
0.7M☉. The distribution of fractional disk luminosities in
Serpens resembles that of the young Taurus Molecular Cloud, with most
disks consistent with optically thick, passively irradiated disks in a
variety of disk geometries (Ldisk/Lstar∼0.1). In contrast, the
distributions for the older Upper Scorpius and η Chamaeleontis
clusters are dominated by optically thin lower luminosity disks
(Ldisk/Lstar∼0.02). This evolution in fractional disk luminosities
is concurrent with that of disk fractions: with time disks become
fainter and the disk fractions decrease. The actively accreting and
non-accreting stars (based on Hα data) in Serpens show very
similar distributions in fractional disk luminosities, differing only
in the brighter tail dominated by strongly accreting stars. In
contrast with a sample of Herbig Ae/Be stars, the T Tauri stars in
Serpens do not have a clear separation in fractional disk luminosities
for different disk geometries: both flared and flat disks present
wider, overlapping distributions. This result is consistent with
previous suggestions of a faster evolution for disks around Herbig
Ae/Be stars. Furthermore, the results for the mineralogy of the dust
in the disk surface (grain sizes, temperatures and crystallinity
fractions, as derived from Spitzer/IRS spectra) do not show any
correlation to either stellar and disk characteristics or mean cluster
age in the 1-10Myr range probed here. A possible explanation for the
lack of correlation is that the processes affecting the dust within
disks have short timescales, happening repeatedly, making it difficult
to distinguish long-lasting evolutionary effects.
Description:
Oliveira et al. (2010, Cat. J/ApJ/714/778) describe the complete,
flux-limited sample of YSOs in Serpens that is used in this work, for
which Spitzer/IRS spectra (5-35um) have been taken.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 124 92 Stellar and disk parameters in Serpens
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See also:
J/MNRAS/421/3257 : MHO catalogue for Serpens and Aquila (Ioannidis+, 2012)
J/ApJ/734/51 : Mineralogical compositions of dust grains (Oliveira+, 2011)
J/ApJ/724/835 : The Spitzer c2d survey of WTTSs. III. (Wahhaj+, 2010)
J/ApJ/714/778 : YSOs in the Serpens Molecular Cloud (Oliveira+, 2010)
J/A+A/513/A38 : RZJHK phot. for stellar sources in Serpens (Spezzi+, 2010)
J/AJ/140/266 : NGC 1333 X-ray luminous YSOs properties (Winston+, 2010)
J/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)
J/ApJS/181/321 : Properties of Spitzer c2d dark clouds (Evans+, 2009)
J/ApJ/692/973 : Protostars in Perseus, Serpens and Ophiuchus (Enoch+, 2009)
J/ApJ/691/672 : YSOs spectroscopy in Serpens molecular cloud (Oliveira+ 2009)
J/ApJ/669/493 : Spitzer/Chandra YSOs in Serpens cloud core (Winston+, 2007)
J/ApJ/667/308 : Weak-line T Tauri in Spitzer c2d Survey. II. (Cieza+, 2007)
J/ApJ/663/1149 : Spitzer survey of Serpens YSO population (Harvey+, 2007)
J/A+A/421/623 : ISOCAM survey of YSOs in Serpens Cloud Core (Kaas+, 2004)
J/A+A/337/403 : Low-mass stars evolutionary models (Baraffe+ 1998)
J/A+A/330/990 : VRIJHK phot. of the Serpens cloud core (Giovannetti+ 1998)
http://irsa.ipac.caltech.edu/data/SPITZER/docs/spitzermission/
observingprograms/legacy/c2d/ : Spitzer c2d data deliveries page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [OMP2009] [1/149] Identification number as in Oliveira
et al. (2010, Cat. J/ApJ/714/778)
5 A1 --- f_SpT [b] b: spectral types from photometry
7- 22 A16 --- SSTc2d SSTc2d identifier (HHMMSSss+DDMMSSs; J2000)
24- 27 A4 --- SpT MK spectral type
29- 32 I4 K Teff [2510/8970] Effective temperature
34- 37 I4 K E_Teff [50/3100] Positive error on Teff
39- 42 I4 K e_Teff [30/1220] Negative error on Teff
44- 49 F6.2 Lsun Lstar [0.02/371] Stellar luminosity
51- 56 F6.2 Lsun E_Lstar [0.02/289] Positive error on Lstar
58- 62 F5.2 Lsun e_Lstar [0.01/87] Negative error on Lstar
64- 68 F5.2 Lsun Ldisk [0/90] Disk luminosity
70- 74 F5.2 Lsun E_Ldisk [0/63] Positive error on Ldisk
76- 80 F5.2 Lsun e_Ldisk [0/63] Negative error on Ldisk
82- 85 F4.1 mag Av [0/25] Visual extinction
87- 91 F5.2 Myr Age [0.3/22]? Age
93- 97 F5.2 Myr E_Age [0.06/71]? Positive error on Age
99-103 F5.2 Myr e_Age [0.06/16]? Negative error on Age
105-110 F6.2 Msun Mass [0.06/117]? Mass
112-115 F4.2 Msun E_Mass [0.02/2]? Positive error on Mass
117-120 F4.2 Msun e_Mass [0/1.1]? Negative error on Mass
122-124 A3 --- Accr [yes/no /-] Accreting?
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 16-Sep-2014