568 citations · 21.9k across the 202 of their papers we have counts for
16 papers · 2 filters
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 IRS Spectra and Envelope Models of Class I Protostars in Taurus
E. Furlan, M. McClure, N. Calvet +8
We present Spitzer Infrared Spectrograph spectra of 28 Class I protostars in the Taurus star-forming region. The 5 to 36 micron spectra reveal excess emission from the inner region…
Kinematics of NGC 2264: signs of cluster formation
Gabor Furesz, Lee W. Hartmann, Andrew H. Szentgyorgyi +7
We present results from 1078 high resolution spectra of 990 stars in the young open cluster NGC 2264, obtained with the Hectochelle multiobject echelle spectrograph on the 6.5m MMT…
Kinematic Structure of the Orion Nebula Cluster and its Surroundings
Gabor Furesz, Lee W. Hartmann, S. Thomas Megeath +2
We present results from 1351 high resolution spectra of 1215 stars in the Orion Nebula Cluster (ONC) and the surrounding Orion 1c association, obtained with the Hectochelle multiob…
The Rapid Outbursting Star GM Cep: An EX-or in Tr 37?
Aurora Sicilia-Aguilar, Bruno Merin, Felix Hormuth +9
We present optical, IR and millimeter observations of the solar-type star 13-277, also known as GM Cep, in the 4 Myr-old cluster Tr 37. GM Cep experiences rapid magnitude variation…
Cooling, Gravity and Geometry: Flow-driven Massive Core Formation
Fabian Heitsch, Lee Hartmann, Adrianne D. Slyz +2
We study numerically the formation of molecular clouds in large-scale colliding flows including self-gravity. The models emphasize the competition between the effects of gravity on…
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…
Probing the Dust and Gas in the Transitional Disk of CS Cha with Spitzer
Catherine Espaillat, Nuria Calvet, Paola D'Alessio +10
Here we present the Spitzer IRS spectrum of CS Cha, a member of the ~2 Myr old Chamaeleon star-forming region, which reveals an optically thick circumstellar disk truncated at ~43…
Hubble and Spitzer Observations of an Edge-on Circumstellar Disk around a Brown Dwarf
K. L. Luhman, Lucia Adame, Paola D'Alessio +7
We present observations of a circumstellar disk that is inclined close to edge-on around a young brown dwarf in the Taurus star-forming region. Using data obtained with SpeX at the…
HD 98800: A 10-Myr-Old Transition Disk
E. Furlan, B. Sargent, N. Calvet +7
We present the mid-infrared spectrum, obtained with the Spitzer Infrared Spectrograph (IRS), of HD 98800, a quadruple star system located in the 10-Myr-old TW Hydrae association. I…
SPITZER: Accretion in Low Mass Stars and Brown Dwarfs in the Lambda Orionis Cluster
D. Barrado y Navascues, J. R. Stauffer, M. Morales-Calderon +6
We present multi-wavelength optical and infrared photometry of 170 previously known low mass stars and brown dwarfs of the 5 Myr Collinder 69 cluster (Lambda Orionis). The new phot…
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…
Crystalline silicates and dust processing in the protoplanetary disks of the Taurus young cluster
Dan M. Watson, Jarron M. Leisenring, Elise Furlan +15
We characterize the crystalline silicate content and spatial distribution of small dust grains in a large sample of protoplanetary disks in the Taurus-Auriga young cluster, using S…
25 Orionis: A Kinematically Distinct 10 Myr Old Group in Orion OB1a
Cesar Briceno, Lee Hartmann, Jesus Hernandez +4
We report here on the photometric and kinematic properties of a well defined group of nearly 200 low-mass pre-main sequence stars, concentrated within ~ 1 deg of the early-B star 2…
Silicate Dust in Evolved Protoplanetary Disks: Growth, Sedimentation, and Accretion
Aurora Sicilia-Aguilar, L. W. Hartmann, Dan Watson +3
We present the Spitzer IRS spectra for 33 young stars in Tr 37 and NGC 7160. The sample includes the high- and intermediate-mass stars with MIPS 24 microns excess, the only known a…