Publications (28)
Double-peaked OI profile: a likely signature of the gaseous ring around KH 15D
Min Fang, Ilaria Pascucci, Jinyoung Serena Kim +1
KH 15D is a well-known spectroscopic binary because of its unique and dramatic photometric variability. The variability is explained by a circumbinary dust ring but the ring itself…
Probing T Tauri Accretion and Outflow with 1 Micron Spectroscopy
Suzan Edwards, William Fischer, Lynne Hillenbrand +1
In a high dispersion 1 micron survey of 39 classical T Tauri stars veiling is detected in 80%, and He I 10830 and Pgamma line emission in 97% of the stars. On average, the 1 micron…
Class I/II Jets with JWST: Mass loss rates, Asymmetries, and Binary induced Wigglings
Naman S. Bajaj, Ilaria Pascucci, Tracy L. Beck +11
We present JWST NIRSpec spectro-imaging observations of jets from four edge-on protoplanetary disks that exhibit clear signatures of MHD disk winds. Bipolar jets are detected and s…
The Role of Disk Winds in the Evolution and Dispersal of Protoplanetary Disks
Ilaria Pascucci, Sylvie Cabrit, Suzan Edwards +3
The assembly and architecture of planetary systems strongly depend on the physical processes governing the evolution and dispersal of protoplanetary disks. Since Protostars and Pla…
Gaps and Rings in an ALMA Survey of Disks in the Taurus Star-forming Region
Feng Long, Paola Pinilla, Gregory J. Herczeg +23
Rings are the most frequently revealed substructure in ALMA dust observations of protoplanetary disks, but their origin is still hotly debated. In this paper, we identify dust subs…
Modeling T Tauri Winds from He I 10830 Profiles
John Kwan, Suzan Edwards, William Fischer
The high opacity of He I 10830 makes it an exceptionally sensitive probe of the inner wind geometry of accreting T Tauri stars. In this line blueshifted absorption below the contin…
Understanding the origin of the [OI] low-velocity component from T Tauri stars
Elisabetta Rigliaco, Ilaria Pascucci, Uma Gorti +2
The formation time, masses, and location of planets are strongly impacted by the physical mechanisms that disperse protoplanetary disks and the timescale over which protoplanetary…
Near-Infrared Classification Spectroscopy: H-band Spectra of Fundamental MK Standards
Michael R. Meyer, Suzan Edwards, Kenneth H. Hinkle +1
We present a catalogue of H-band spectra for 85 stars of approximately solar abundance observed at a resolving power of 3000 with the KPNO Mayall 4m FTS. The atlas covers spectral…
Compact Disks in a High Resolution ALMA Survey of Dust Structures in the Taurus Molecular Cloud
Feng Long, Gregory J. Herczeg, Daniel Harsono +24
We present a high-resolution (, au, mean sensitivity of Jy~beam at 225 GHz) snapshot survey of 32 protoplanetary disks around young stars with sp…
F, G, K, M Spectral Standards in the Y Band (0.95-1.11 um)
Chelsea Sharon, Lynne Hillenbrand, William Fischer +1
We take advantage of good atmospheric transparency and the availability of high quality instrumentation in the 1 um near-infrared atmospheric window to present a grid of F, G, K, a…
Accretion Rates for T Tauri Stars Using Nearly Simultaneous Ultraviolet and Optical Spectra
Laura Ingleby, Nuria Calvet, Gregory Herczeg +9
We analyze the accretion properties of 21 low mass T Tauri stars using a dataset of contemporaneous near ultraviolet (NUV) through optical observations obtained with the Hubble Spa…
JWST/MIRI Reveals the Evolution from Molecular to Atomic Disk Winds
Naman S. Bajaj, Ilaria Pascucci, Sylvie Cabrit +10
The evolution and dispersal of protoplanetary disks--governed by accretion, magnetically launched jets and winds, and photoevaporative winds--fundamentally shape planetary systems.…
Hot Gas Lines in T Tauri Stars
David R. Ardila, Gregory J. Herczeg, Scott G. Gregory +20
For Classical T Tauri Stars (CTTSs), the resonance lines of N V, Si IV, and C IV, as well as the He II 1640 A line, act as diagnostics of the accretion process. Here we assemble a…
Characterizing the IYJ Excess Continuum Emission in T Tauri Stars
William Fischer, Suzan Edwards, Lynne Hillenbrand +1
We present the first characterization of the excess continuum emission of accreting T Tauri stars between optical and near-infrared wavelengths. With nearly simultaneous spectra fr…
JWST/NIRSpec Reveals the Nested Morphology of Disk Winds from Young Stars
Ilaria Pascucci, Tracy L. Beck, Sylvie Cabrit +15
Radially extended disk winds could be the key to unlocking how protoplanetary disks accrete and how planets form and migrate. A distinctive characteristic is their nested morpholog…
Interpreting Near Infrared Hydrogen Line Ratios in T Tauri Stars
Suzan Edwards, John Kwan, William Fischer +4
In accreting young stars one of the prominent spectral features in the near infrared is the Paschen and Brackett series in emission. We examine hydrogen line ratios for 16 classica…
Direct Measurement of Interstellar Extinction Toward Young Stars Using Atomic Hydrogen Lyman- Absorption
Matthew McJunkin, Kevin France, P. C. Schneider +5
Interstellar reddening corrections are necessary to reconstruct the intrinsic spectral energy distributions (SEDs) of accreting protostellar systems. The stellar SED determines the…
NUV Excess in Slowly Accreting T Tauri Stars: Limits Imposed by Chromospheric Emission
Laura Ingleby, Nuria Calvet, Edwin Bergin +20
Young stars surrounded by disks with very low mass accretion rates are likely in the final stages of inner disk evolution and therefore particularly interesting to study. We presen…
A New Look at T Tauri Star Forbidden Lines: MHD Driven Winds from the Inner Disk
Min Fang, Ilaria Pascucci, Suzan Edwards +6
Magnetohydrodynamic (MHD) and photoevaporative winds are thought to play an important role in the evolution and dispersal of planet-forming disks. We report the first high-resoluti…
Redshifted Absorption at He I 10830 as a Probe of the Accretion Geometry of T Tauri Stars
William Fischer, John Kwan, Suzan Edwards +1
We probe the geometry of magnetospheric accretion in classical T Tauri stars by modeling red absorption at He I 10830 via scattering of the stellar and veiling continua. Under the…
MagAO-X and HST high-contrast imaging of the AS209 disk at H
Gabriele Cugno, Yifan Zhou, Thanawuth Thanathibodee +22
The detection of emission lines associated with accretion processes is a direct method for studying how and where gas giant planets form, how young planets interact with their nata…
S and VV Corona Australis: Spectroscopic Variability in Two Young Binary Star Systems
Kendall Sullivan, L. Prato, Suzan Edwards +2
We used high-resolution near-infrared spectroscopy from the NIRSPEC instrument on the Keck II telescope, taken over multiple epochs spanning five years, to examine two young binary…
Kinematic links and the co-evolution of MHD winds, jets, and inner disks from a high-resolution optical [OI] survey
Andrea Banzatti, Ilaria Pascucci, Suzan Edwards +3
We present a survey of optical [OI] emission at 6300 Ã toward 65 TTauri stars at the spectral resolution of km/s. Past work identified a highly blueshifted velocity compone…
Twenty-Five Years of Accretion onto the Classical T Tauri Star TW Hya
Gregory J. Herczeg, Yuguang Chen, Jean-Francois Donati +39
Accretion plays a central role in the physics that governs the evolution and dispersal of protoplanetary disks. The primary goal of this paper is to analyze the stability over time…
A High-resolution Optical Survey of Upper Sco: Evidence for Coevolution of Accretion and Disk Winds
Min Fang, Ilaria Pascucci, Suzan Edwards +3
Magnetohydrodynamic (MHD) and photoevaporative winds are thought to play an important role in the evolution and dispersal of planet-forming disks. Here, we analyze high-resolution…
The ODYSSEUS Survey. Motivation and First Results: Accretion, Ejection, and Disk Irradiation of CVSO 109
C. C. Espaillat, G. J. Herczeg, T. Thanathibodee +59
The Hubble UV Legacy Library of Young Stars as Essential Standards (ULLYSES) Director's Discretionary Program of low-mass pre-main-sequence stars, coupled with forthcoming data fro…
Winds and Accretion in Young Stars
Suzan Edwards
Establishing the origin of accretion powered winds from forming stars is critical for understanding angular momentum evolution in the star-disk interaction region. Here, the high v…
Near-Infrared Classification Spectroscopy: J-Band Spectra of Fundamental MK Standards
Lloyd Wallace, Michael R. Meyer, Kenneth Hinkle +1
We present a catalog of J-band spectra for 88 fundamental MK standard stars observed at a resolving power of R ~ 3000. This contribution serves as a companion atlas to the K-band s…