Publications (26)
Herschel/HIFI discovery of interstellar chloronium (HCl)
D. C. Lis, J. C. Pearson, D. A. Neufeld +102
We report the first detection of chloronium, HCl, in the interstellar medium, using the HIFI instrument aboard the \emph{Herschel} Space Observatory. The li…
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…
The Photoevaporative Wind from the Disk of TW Hya
I. Pascucci, M. Sterzik, R. D. Alexander +6
Photoevaporation driven by the central star is expected to be a ubiquitous and important mechanism to disperse the circumstellar dust and gas from which planets form. Here, we pres…
The formation and evolution of planetary systems: Grain growth and chemical processing of dust in T Tauri systems
J. Bouwman, Th. Henning, L. A. Hillenbrand +8
This paper is one in a series presenting results obtained within the Formation and Evolution of Planetary Systems (FEPS) Legacy Science Program on the Spitzer Space Telescope. Here…
Models of the Structure and Evolution of Protoplanetary Disks
C. P. Dullemond, D. Hollenbach, I. Kamp +1
We review advances in the modeling of protoplanetary disks. This review will focus on the regions of the disk beyond the dust sublimation radius, i.e. beyond 0.1 - 1 AU, depending…
Gas phase water in the surface layer of protoplanetary disks
C. Dominik, C. Ceccarelli, D. Hollenbach +1
Recent observations of the ground state transition of HDO at 464 GHz towards the protoplanetary disk of DM Tau have detected the presence of water vapor in the regions just above t…
Far Infrared Spectroscopy of Normal Galaxies: Physical Conditions in the Interstellar Medium
S. Malhotra, M. J. Kaufman, D. Hollenbach +8
The most important cooling lines of the neutral interstellar medium (ISM) lie in the far-infrared (FIR). We present measurements by the Infrared Space Observatory Long Wavelength S…
The Interstellar Medium of Star-forming Irregular Galaxies: The View with ISO
D. Hunter, M. Kaufman, D. Hollenbach +8
We present mid-infrared imaging and far-infrared (FIR) spectroscopy of 5 IBm galaxies observed by ISO as part of our larger study of the inter- stellar medium of galaxies. Most of…
Formation and Evolution of Planetary Systems: Upper Limits to the Gas Mass in Disks Around Sun-like Stars
I. Pascucci, U. Gorti, D. Hollenbach +17
We have carried out a sensitive search for gas emission lines at infrared and millimeter wavelengths for a sample of 15 young sun-like stars selected from our dust disk survey with…
Dust and Atomic Gas in Dwarf Irregular Galaxies of the M81 Group: The SINGS and THINGS view
F. Walter, J. Cannon, H. Roussel +22
[abridged] We present observations of the dust and atomic gas phase in seven dwarf irregular galaxies of the M81 group from the SINGS and THINGS surveys. The Spitzer observations p…
Formation and Evolution of Planetary Systems: Upper Limits the Gas Mass in HD105
D. Hollenbach, U. Gorti, M. Meyer +13
We report infrared spectroscopic observations of HD 105, a nearby ( pc) and relatively young ( Myr) G0 star with excess infrared continuum emission, which has bee…
Free-free Emission and Radio Recombination Lines from Photoevaporating Disks
I. Pascucci, U. Gorti, D. Hollenbach
Recent infrared observations have demonstrated that photoevaporation driven by high-energy photons from the central star contributes to the dispersal of protoplanetary disks. Here,…
Dispersal of protoplanetary disks by central wind stripping
I. Matsuyama, D. Johnstone, D. Hollenbach
We present a model for the dispersal of protoplanetary disks by winds from either the central star or the inner disk. These winds obliquely strike the flaring disk surface and stri…
The Neutral Atomic Phases of the ISM in the Galaxy
M. G. Wolfire, C. F. McKee, D. Hollenbach +1
Much of the interstellar medium in disk galaxies is in the form of neutral atomic hydrogen, H I. This gas can be in thermal equilibrium at relatively low temperatures, T < 300 K (t…
Low EUV Luminosities Impinging on Protoplanetary Disks
I. Pascucci, L. Ricci, U. Gorti +4
The amount of high-energy stellar radiation reaching the surface of protoplanetary disks is essential to determine their chemistry and physical evolution. Here, we use millimetric…
Evolution of Mid-IR Excess Around Sun-like Stars: Constraints on Models of Terrestrial Planet Formation
M. R. Meyer, J. M. Carpenter, E. E. Mamajek +11
We report observations from the Spitzer Space Telescope (SST) regarding the frequency of 24 micron excess emission toward sun-like stars. Our unbiased sample is comprised of 309 st…
Probing the Interstellar Medium in Early type galaxies with ISO observations
S. Malhotra, D. Hollenbach, G. Helou +9
Four IRAS-detected early type galaxies were observed with ISO. With the exception of the 15 micron image of NGC1052, the mid-IR emission from NGC1052, NGC1155, NGC5866 and NGC6958…
Spatially Resolved Spitzer-IRS Spectral Maps of the Superwind in M82
P. Beirão, L. Armus, M. D. Lehnert +12
We have mapped the superwind/halo region of the nearby starburst galaxy M82 in the mid-infrared with . The spectral regions covered include the H, [NeII]…
The Formation and Evolution of Planetary Systems: First Results from a Spitzer Legacy Science Program
M. R. Meyer, L. A. Hillenbrand, D. E. Backman +34
We present 3-160 micron photometry obtained with the IRAC and MIPS instruments for the first five targets from the Spitzer Legacy Science Program "Formation and Evolution of Planet…
The Formation and Evolution of Planetary Systems: SIRTF Legacy Science in the VLT Era
M. R. Meyer, D. Backman, S. V. W. Beckwith +20
We will utilize the sensitivity of SIRTF through the Legacy Science Program to carry out spectrophotometric observations of solar-type stars aimed at (1) defining the timescales ov…
Narrow Na and K Absorption Lines Toward T Tauri Stars - Tracing the Atomic Envelope of Molecular Clouds
I. Pascucci, S. Edwards, M. Heyer +5
We present a detailed analysis of narrow of NaI and KI absorption resonance lines toward nearly 40 T Tauri stars in Taurus with the goal of clarifying their origin. The NaI 5889.95…
Spitzer and JCMT Observations of the Active Galactic Nucleus in the Sombrero Galaxy (NGC 4594)
G. J. Bendo, B. A. Buckalew, D. A. Dale +14
We present Spitzer 3.6-160 micron images, Spitzer mid-infrared spectra, and JCMT SCUBA 850 micron images of the Sombrero Galaxy (NGC 4594), an Sa galaxy with a 10^9 M_solar low lum…
Extended Mid-Infrared Aromatic Feature Emission in M 82
C. W. Engelbracht, P. Kundurthy, K. D. Gordon +19
We present new images (groundbased optical and mid-infrared (MIR) from the Spitzer Space Telescope) and spectra (from Spitzer) of the archetypal starburst galaxy M 82. The Spitzer…
A near-infrared study of the planetary nebula NGC 2346
B. Vicini, A. Natta, A. Marconi +3
This paper presents new near-infrared observations of the planetary nebula NGC 2346. The data include a broad K-band image, an image in the H2 vibrationally excited 1-0S(1) line an…
Tracing Slow Winds from T Tauri Stars via Low Velocity Forbidden Line Emission
M. N. Simon, I. Pascucci, S. Edwards +5
Using Keck/HIRES spectra Îv ~ 7 km/s, we analyze forbidden lines of [O I] 6300 Ã , [O I] 5577 Ã and [S II] 6731 Ã from 33 T Tauri stars covering a range of disk evolutionary stage…
ISO measurements of [CII] line variations in galaxies
S. Malhotra, G. Helou, G. Stacey +11
We report measurements of the [CII] fine structure line at 157.714 micron in 30 normal star-forming galaxies with the Long Wavelength Spectrometer (LWS) on the Infrared Space Obser…