S. Thomas Megeath

A Spitzer Census of Transitional Protoplanetary Disks with AU-Scale Inner Holes (2009)

Muzerolle, James, Allen, Lori E., Megeath, S. Thomas, Hernandez, Jesus, Gutermuth, Robert A.

[abridged] Protoplanetary disks with AU-scale inner clearings, often referred to as transitional disks, provide a unique sample for understanding disk dissipation mechanisms and possible connections...

Evidence for Dynamical Changes in a Transitional Protoplanetary Disk with Mid-infrared Variability (2009)

Muzerolle, James, Flaherty, Kevin, Balog, Zoltan, Furlan, Elise, Smith, Paul S., Allen, Lori, ...

We present multi-epoch Spitzer Space Telescope observations of the transitional disk LRLL 31 in the 2-3 Myr-old star forming region IC 348. Our measurements show remarkable mid-infrared variability...

Young stellar clusters and star formation throughout the Galaxy (2009)

Feigelson, Eric, Adams, Fred, Allen, Lori, Bergin, Edwin, Bally, John, Balog, Zoltan, ...

Most stars are born in rich young stellar clusters (YSCs) embedded in giant molecular clouds. The most massive stars live out their short lives there, profoundly influencing their natal environments...

An Infrared Census of Star Formation in the Horsehead Nebula (2009)

Bowler, Brendan P., Waller, William H., Megeath, S. Thomas, Patten, Brian M., Tamura, Motohide

At ~ 400 pc, the Horsehead Nebula (B33) is the closest radiatively-sculpted pillar to the Sun, but the state and extent of star formation in this structure is not well understood. We present deep...

Photometry using the Infrared Array Camera on the Spitzer Space Telescope (2008)

Hora, Joseph L., Carey, Sean, Surace, Jason, Marengo, Massimo, Lowrance, Patrick, Glaccum, William J., ...

We present several corrections for point-source photometry to be applied to data from the Infrared Array Camera (IRAC) on the Spitzer Space Telescope. These corrections are necessary because of...

Photometry using the Infrared Array Camera on the Spitzer Space Telescope (2008)

Hora, Joseph L., Carey, Sean, Surace, Jason, Marengo, Massimo, Lowrance, Patrick, Glaccum, William J., ...

We present several corrections for point source photometry to be applied to data from the Infrared Array Camera (IRAC) on the Spitzer Space Telescope. These corrections are necessary because of...

Spitzer IRAC and MIPS Imaging of Clusters and Outflows in 9 High-mass Star Forming Regions (2008)

Qiu, Keping, Zhang, Qizhou, Megeath, S. Thomas, Gutermuth, Robert A., Beuther, Henrik, Shepherd, Debra S., ...

We present Spitzer Space Telescope IRAC and MIPS observations toward a sample of nine high-mass star forming regions at a distance of around 2 kpc. Based on IRAC and MIPS 24 $\mu$m photometric...

The Broadband Infrared Emission Spectrum of the Exoplanet HD 189733b (2008)

Charbonneau, David, Knutson, Heather A., Barman, Travis, Allen, Lori E., Mayor, Michel, Megeath, S. Thomas, ...

We present Spitzer Space Telescope time series photometry of the exoplanet system HD 189733 spanning two times of secondary eclipse, when the planet passes out of view behind the parent star. We...

Spitzer IRAC and MIPS imaging of clusters and outflows in nine high-mass star forming regions (2008)

Qiu, Keping, Zhang, Qizhou, Megeath, S. Thomas, Gutermuth, Robert A., Beuther, Henrik, Shepherd, Debra S., ...

We present Spitzer Space Telescope IRAC and MIPS observations toward a sample of nine high-mass star forming regions at a distance of around 2 kpc. Based on IRAC and MIPS 24 mum photometric results...

Kinematic Structure of the Orion Nebula Cluster and its Surroundings (2007)

Furesz, Gabor, Hartmann, Lee W., Megeath, S. Thomas, Szentgyorgyi, Andrew H., Hamden, Erika T.

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 multiobject echelle...

Spitzer, Near-Infrared, and Submillimeter Imaging of the Relatively Sparse Young Cluster, Lynds 988e (2007)

Allen, Thomas S., Pipher, Judith L., Gutermuth, Robert A., Megeath, S. Thomas, Adams, Joseph D., Herter, Terry L., ...

We present {\it Spitzer} images of the relatively sparse, low luminosity young cluster L988e, as well as complementary near-infrared (NIR) and submillimeter images of the region. The cluster is...

The 3.6-8.0 Micron Broadband Emission Spectrum of HD 209458b: Evidence for an Atmospheric Temperature Inversion (2007)

Knutson, Heather A., Charbonneau, David, Allen, Lori E., Burrows, Adam, Megeath, S. Thomas

We estimate the strength of the bandpass-integrated thermal emission from the extrasolar planet HD 209458b at 3.6, 4.5, 5.8, and 8.0 microns using the Infrared Array Camera (IRAC) on the Spitzer...

A map of the day-night contrast of the extrasolar planet HD 189733b (2007)

Knutson, Heather A., Charbonneau, David, Allen, Lori E., Fortney, Jonathan J., Agol, Eric, Cowan, Nicolas B., ...

"Hot Jupiter" extrasolar planets are expected to be tidally locked because they are close (

Spitzer/IRAC Photometry of M, L, and T Dwarfs (2006)

Patten, Brian M., Stauffer, John R., Burrows, Adam, Marengo, Massimo, Hora, Joseph L., Luhman, Kevin L., ...

We present the results of a program to acquire photometry for eighty-six late-M, L, and T dwarfs using the Infrared Array Camera (IRAC) on the Spitzer Space Telescope. We examine the behavior of...

24-micron Detections of Disks around Very Low-mass Stars and Brown Dwarfs in IC 348: Grain Growth/Settling and Inner Holes? (2006)

Muzerolle, James, Adame, Lucia, D'Alessio, Paola, Calvet, Nuria, Luhman, Kevin, Muench, August, ...

We present observations of six late-type members of the young cluster IC 348 detected at 24 microns with the Multiband Imaging Photometer for Spitzer(MIPS). At least four of the objects are probably...

Identifying Primordial Substructure in NGC 2264 (2005)

Teixeira, Paula S., Lada, Charles J., Young, Erick T., Marengo, Massimo, Muench, August, Muzerolle, James, ...

We present new Spitzer Space Telescope observations of the young cluster NGC2264. Observations at 24 micron with the Multiband Imaging Photometer has enabled us to identify the most highly embedded...

Detection of Thermal Emission from an Extrasolar Planet (2005)

Charbonneau, David, Allen, Lori E., Megeath, S. Thomas, Torres, Guillermo, Alonso, Roi, Brown, Timothy M., ...

We present Spitzer Space Telescope infrared photometric time series of the transiting extrasolar planet system TrES-1. The data span a predicted time of secondary eclipse, corresponding to the...

Detection of Thermal Emission from an Extrasolar Planet (2005)

David Charbonneau, Lori E. Allen, S. Thomas Megeath, Guillermo Torres, Roi Alonso, Timothy M. Brown, ...

We present Spitzer Space Telescope infrared photometric time series of the transiting extrasolar planet system TrES-1. The data span a predicted time of secondary eclipse, corresponding to the...

IRAC Colors of Young Stellar Objects (2004)

Allen, Lori E., Calvet, Nuria, D'Alessio, Paola, Merin, Bruno, Hartmann, Lee, Megeath, S. Thomas, ...

We compare the infrared colors predicted by theoretical models of protostellar envelopes and protoplanetary disks with initial observations of young stellar objects made with the Infrared Array...

A Catalog of Young Stellar Groups and Clusters Within 1kpc of the Sun (2003)

Porras, Alicia, Christopher, Micol, Allen, Lori, Di Francesco, James, Megeath, S. Thomas, Myers, Philip C.

We present a catalog of near-infrared surveys of young (