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A slowly accreting ~10 Myr old transitional disk in Orion OB1a
C. Espaillat, J. Muzerolle, J. Hernandez +7
Here we present the Spitzer IRS spectrum of CVSO 224, the sole transitional disk located within the ~10 Myr old 25 Orionis group in Orion OB1a. A model fit to the spectral energy d…
Clustered and Triggered Star Formation in W5: Observations with Spitzer
Xavier P. Koenig, Lori E. Allen, Robert A. Gutermuth +3
We present images and initial results from our extensive Spitzer Space Telescope imaging survey of the W5 H II region with the Infrared Array Camera (IRAC) and Multiband Imaging Ph…
Photoevaporation of Protoplanetary Disks
Z. Balog, G. H. Rieke, J. Muzerolle +4
We present HST/NICMOS Paschen alpha images and low and high resolution IRS spectra of photoevaporating disk-tail systems originally detected at 24 micron near O stars. We find no P…
Confirmation of a gapped primordial disk around LkCa 15
Catherine Espaillat, Nuria Calvet, Kevin L. Luhman +2
Recently, analysis of near-infrared broad-band photometry and Spitzer IRS spectra has led to the identification of a new "pre-transitional disk" class whose members have an inner o…
A Spitzer view of protoplanetary disks in the gamma Velorum cluster
Jesus Hernandez, Lee Hartmann, Nuria Calvet +4
We present new Spitzer Space Telescope observations of stars in the young ~5 Myr gamma Velorum stellar cluster. Combining optical and 2MASS photometry, we have selected 579 stars a…
CaII Infrared triplet line models in Classical T Tauri stars
R. Azevedo, N. Calvet, L. Hartmann +3
We study the formation of the calcium II infrared triplet lines 8498Å, 8542Åand 8662Å, in the accreting magnetospheric flows of Classical T Tauri stars (CTTS), and present a grid o…
Spitzer Observations of NGC 1333: A Study of Structure and Evolution in a Nearby Embedded Cluster
R. A. Gutermuth, P. C. Myers, S. T. Megeath +6
We present a comprehensive analysis of structure in the young, embedded cluster, NGC 1333 using members identified with Spitzer and 2MASS photometry based on their IR-excess emissi…
Spitzer observations of the Orion OB1 association: disk census in the low mass stars
Jesus Hernandez, Nuria Calvet, C. Briceno +6
We present new Spitzer Space Telescope observations of two fields in the Orion OB1 association. We report here IRAC/MIPS observations for 115 confirmed members and 41 photometric c…
The Hot Inner Disk of FU Ori
Zhaohuan Zhu, Lee Hartmann, Nuria Calvet +3
We have constructed a detailed radiative transfer disk model which reproduces the main features of the spectrum of the outbursting young stellar object FU Orionis from ~ 4000 angst…
Debris Disks in NGC 2547
N. Gorlova, Z. Balog, G. H. Rieke +4
We have surveyed the 30 Myr-old cluster NGC 2547 for planetary debris disks using Spitzer. At 4.5-8 um we are sensitive to the photospheric level down to mid-M stars (0.2 Msol) and…
A Combined Spitzer and Chandra Survey of Young Stellar Objects in the Serpens Cloud Core
E. Winston, S. T. Megeath, S. J. Wolk +7
We present Spitzer and Chandra observations of the nearby (~260 pc) embedded stellar cluster in the Serpens Cloud Core. We observed, using Spitzer's IRAC and MIPS instruments, in s…
Absolute Calibration and Characterization of the Multiband Imaging Photometer for Spitzer. I. The Stellar Calibrator Sample and the 24 micron Calibration
C. W. Engelbracht, M. Blaylock, K. Y. L. Su +23
We present the stellar calibrator sample and the conversion from instrumental to physical units for the 24 micron channel of the Multiband Imaging Photometer for Spitzer (MIPS). Th…
Near and Mid-IR Photometry of the Pleiades, and a New List of Substellar Candidate Members
John R. Stauffer, Lee W. Hartmann, Giovanni G. Fazio +13
We make use of new near and mid-IR photometry of the Pleiades cluster in order to help identify proposed cluster members. We also use the new photometry with previously published p…
Demographics of Transition Objects
Joan R. Najita, Stephen E. Strom, James Muzerolle
The unusual properties of transition objects (young stars with an optically thin inner disc surrounded by an optically thick outer disc) suggest that significant disc evolution has…
A Spitzer census of the IC 348 nebula
August A. Muench, Charles J. Lada, K. L. Luhman +2
We present a Spitzer based census of the IC 348 nebula and embedded star cluster. Our Spitzer census supplemented by ground based spectra has added 42 class II T-Tauri sources to t…
Infrared Extinction Toward Nearby Star-Forming Regions
K. M. Flaherty, J. L. Pipher, S. T. Megeath +4
We present an independent estimate of the interstellar extinction law for the Spitzer IRAC bands as well as a first attempt at extending the law to the 24micron MIPS band. The sour…
Detection of [Ne II] Emission from Young Circumstellar Disks
I. Pascucci, D. Hollenbach, J. Najita +9
We report the detection of [Ne II] emission at 12.81 micron in four out of the six optically thick dust disks observed as part of the FEPS Spitzer Legacy program. In addition, we d…
SPITZER/IRAC-MIPS Survey of NGC2244: Protostellar Disk Survival in the Vicinity of Hot Stars
Zoltan Balog, James Muzerolle, G. H. Rieke +2
We present the results from a survey of NGC 2244 from 3.6 to 24 micron with the Spitzer Space Telescope. The 24micron-8micron-3.6micron color composite image of the region shows th…
Spitzer Space Telescope study of disks in the young Orionis cluster
Jesus Hernandez, L. Hartmann, T. Megeath +9
We report new Spitzer Space Telescope observations from the IRAC and MIPS instruments of the young (~ 3 Myr) sigma Orionis cluster. We identify 336 stars as members of the cluster…
Spitzer/IRAC and JHKs Observations of h & chi Persei: Constraints on Protoplanetary Disk and Massive Cluster Evolution at ~ 10^{7} yr
Thayne Currie, Zoltan Balog, S. J. Kenyon +12
We describe IRAC 3.6-8 mu_m observations and ground-based near-IR JHKs photometry from Mimir and 2MASS of the massive double cluster h & chi Persei complete to J=15.5 (M ~ 1.3 Msun…
Accretion in rho-Ophiuchi brown dwarfs: infrared hydrogen line ratios
T. Gatti, L. Testi, A. Natta +2
Mass accretion rate determinations are fundamental for an understanding of the evolution of pre-main sequence star circumstellar disks. Magnetospheric accretion models are used to…
Spitzer 24 Micron Observations of Open Cluster IC 2391 and Debris Disk Evolution of FGK Stars
Nick Siegler, James Muzerolle, Erick T. Young +5
We present 24 micron Spitzer/MIPS photometric observations of the ~50 Myr open cluster IC 2391. Thirty-four cluster members ranging in spectral type from B3-M5 were observed in the…
Spitzer/MIPS 24 micron Detection of Photoevaporating Protoplanetary Disks
Z. Balog, G. H. Rieke, K. Y. L. Su +2
We present 24 micron images of three protoplanetary disks being photoevaporated around high mass O type stars. These objects have ``cometary'' structure where the dust pulled away…
Debris Disk Evolution Around A Stars
K. Y. L. Su, G. H. Rieke, J. A. Stansberry +8
We report 24 and/or 70 um measurements of ~160 A-type main-sequence stars using the Multiband Imaging Photometer for Spitzer (MIPS). Their ages range from 5 to 850 Myr based on est…