Patrick Hartigan
A5018953434- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
- Laser-Plasma Interactions and Diagnostics
- Ionosphere and magnetosphere dynamics
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Molecular Spectroscopy and Structure
- Atomic and Molecular Physics
- Space Exploration and Technology
- Laser-induced spectroscopy and plasma
- Atmospheric Ozone and Climate
- Computational Fluid Dynamics and Aerodynamics
- Fluid Dynamics and Turbulent Flows
- Magnetic confinement fusion research
- Adaptive optics and wavefront sensing
- High-pressure geophysics and materials
- Spectroscopy and Laser Applications
- Historical Astronomy and Related Studies
- Gas Dynamics and Kinetic Theory
- Geophysics and Gravity Measurements
Rice University
2015-2024
RIKEN
2024
Pioneer (Japan)
2024
University of Wollongong
2012
University of Tsukuba
2009
University of Rochester
2009
Energetics (United States)
2009
California Institute of Technology
2009
Space Telescope Science Institute
2009
Dublin Institute For Advanced Studies
2009
view Abstract Citations (846) References (87) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Disk Accretion and Mass Loss from Young Stars Hartigan, Patrick ; Edwards, Suzan Ghandour, Louma In this paper we investigate how mass outflows young stars relate to circumstellar disks by analyzing spectroscopic data of 42 T Tauri that span a broad range infrared excesses. We measure the optical excess continuum (veiling) in each star high-resolution 4 m spectra...
view Abstract Citations (674) References (60) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Radiative Bow Shock Models of Herbig-Haro Objects Hartigan, Patrick ; Raymond, John Hartmann, Lee The authors have constructed bow shock models HH objects from a collection 43 radiative planar models. are used to predict the line ratios and profiles expected objects, comparison model with four different regions containing indicates that single unifying - radiating...
Context . JWST has taken the sharpest and most sensitive infrared (IR) spectral imaging observations ever of Orion Bar photodis-sociation region (PDR), which is part nearest massive star-forming Nebula, often considered to be ‘prototypical’ strongly illuminated PDR. Aims We investigate impact radiative feedback from stars on their natal cloud focus transition H II atomic PDR – crossing ionisation front (IF) –, subsequent molecular dissociation (DF). Given prevalence PDRs in interstellar...
From study of a sample 34 T Tauri stars with photometrically derived rotation periods and spectral types later than KS, we find that the observed appear to be related presence or absence an accretion disk. Those which infer surrounded by disks have P(rot) over 4 days most probable about 8.5 days, while those lack disk signatures cover wide range from 1.5 16 including significant number objects less days. This suggests possibility 'initial' angular momentum star is not established until it...
We have conducted a high resolution spectroscopic survey of 15 classical T Tauri stars covering broad range inferred disk accretion rates to study mass infall the stellar surface. Spectral diagnostics are line profiles exhibiting either redshifted absorption minima at velocities comparable free fall or asymmetric emission with more blue than red emission. Echelle spectra from Kitt Peak National Observatory (KPNO) 4 m been used both (1) extract residual unparalleled sensitivity, contamination...
view Abstract Citations (249) References (57) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Mass-Loss Rates, Ionization Fractions, Shock Velocities, and Magnetic Fields of Stellar Jets Hartigan, Patrick ; Morse, Jon A. Raymond, John In this paper we calculate emission-line ratios from a series planar radiative shock models that cover wide range velocities, preshock densities, magnetic fields. The the initial conditions relevant to stellar jets, show how...
We present photometric and spectroscopic observations of the H alpha emission stars in Lupus dark cloud complex. estimate effective temperatures from their spectral types calculate reddening towards each object (R-I) colors. From these data, we derive mass age distributions for using a new set pre-main sequence evolutionar tracks. compare results with those similar population young stellar objects Taurus-Auriga Chamaeleon initial function field solar neighborhood. H-R diagrams, appears to...
The Large Synoptic Survey Telescope is designed to provide an unprecedented optical imaging dataset that will support investigations of our Solar System, Galaxy and Universe, across half the sky over ten years repeated observation. However, exactly how LSST observations be taken (the observing strategy or "cadence") not yet finalized. In this dynamically-evolving community white paper, we explore detailed performance anticipated science expected depend on small changes strategy. Using...
Abstract Massive stars disrupt their natal molecular cloud material through radiative and mechanical feedback processes. These processes have profound effects on the evolution of interstellar matter in our Galaxy throughout universe, from era vigorous star formation at redshifts 1–3 to present day. The dominant can be probed by observations Photo-Dissociation Regions (PDRs) where far-ultraviolet photons massive create warm regions gas dust neutral atomic gas. PDR emission provides a unique...
Most low-mass stars form in stellar clusters that also contain massive stars, which are sources of far-ultraviolet (FUV) radiation. Theoretical models predict this FUV radiation produces photodissociation regions (PDRs) on the surfaces protoplanetary disks around affects planet formation within disks. We report James Webb Space Telescope and Atacama Large Millimeter Array observations a FUV-irradiated disk Orion Nebula. Emission lines detected from PDR; modeling their kinematics excitation...
view Abstract Citations (204) References (44) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Are Wide Pre--Main-Sequence Binaries Coeval? Hartigan, Patrick ; Strom, Karen M. Stephen E. We have observed a sample of 39 wide (projected separations 400-6000 AU) pre-main-sequence binary pairs spectroscopically and with optical near-infrared images. The observations enable us to place 26 the in an H-R diagram determine masses ages primary secondary according three...
view Abstract Citations (213) References (37) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Optical Excess Emission in T Tauri Stars Hartigan, Patrick ; Kenyon, Scott J. Hartmann, Lee Strom, Stephen E. Edwards, Suzan Welty, Alan D. Stauffer, John This paper presents simultaneous high-resolution spectra and spectrophotometric observations of a sample 22 weak-lined classical stars the Taurus-Auriga dark cloud. The reddening, stellar luminosities, variability,...
We present an observational and theoretical study of the optical emission from nonradiative shocks in three supernova remnants: Cygnus Loop, RCW 86, Tycho. The spectra these are dominated by collisionally excited hydrogen Balmer lines, which have both a broad component caused proton-neutral charge exchange narrow excitation cold neutrals entering shock. In each remnant, we obtained broad-to-narrow flux ratios Hα Hβ lines measured width.
We report the results of a spectroscopic survey 20 close T Tauri binaries in Taurus-Auriga dark cloud where separations between primaries and their secondaries are less than typical size circumstellar disk around young star. Analysis low-resolution medium-resolution STIS spectra yields stellar luminosities, reddenings, ages, masses, mass accretion rates, IR excesses, emission line luminosities for each star pair. examine ability color H-alpha equivalent widths, [O I] emission, veiling to...
We present new, deep Hα and [S II] images of the HH 34 jet bow shock obtained with Wide Field Planetary Camera 2 on board Hubble Space Telescope (HST), which reveal structure this fine flow unprecedented detail. Many knots in appear to form small working surfaces bright cores thin filaments where mini–bow shocks extend into surrounding medium. In combination earlier, short-exposure HST we have determined very precise proper-motion vectors for various structures outflow. The becomes visible...
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We present results from an ongoing multiwavelength radial velocity (RV) survey of the Taurus-Auriga star forming region as part our effort to identify pre--main sequence giant planet hosts. These 1-3 Myr old T Tauri stars significant challenges traditional RV surveys. The presence strong magnetic fields gives rise large, cool spots. spots introduce jitter which can mimic modulation a planet-mass companion. To distinguish between spot-induced and planet-induced modulation, we conduct...
We present new, third-epoch Hubble Space Telescope Hα and [S ii] images of three Herbig–Haro (HH) jets (HH 1&2, HH 34, 47) compare the new with those from previous epochs. The high spatial resolution, coupled a time series whose cadence is order both hydrodynamic radiative cooling timescales flow, allows us to follow hydrodynamic/magnetohydrodynamic evolution an astrophysical plasma system in which ionization play significant roles. Cooling zones behind shocks are resolved, so it possible...
ABSTRACT The ∼2 Myr old classical T Tauri star CI Tau shows periodic variability in its radial velocity (RV) variations measured at infrared (IR) and optical wavelengths. We find that these observations are consistent with a massive planet ∼9 day period orbit. These results based on 71 IR RV measurements of this system obtained over five years, 26 nine years. was also observed photometrically the 34 nights ∼one month 2012. data alone inadequate to identify an orbital period, likely result...
(Abridged) Mid-infrared observations of photodissociation regions (PDRs) are dominated by strong emission features called aromatic infrared bands (AIBs). The most prominent AIBs found at 3.3, 6.2, 7.7, 8.6, and 11.2 $\mu$m. sensitive, highest-resolution spectral imaging data ever taken the prototypical PDR, Orion Bar, have been captured JWST. We provide an inventory in along with mid-IR template spectra from five distinct Bar: molecular atomic HII region. use JWST NIRSpec IFU MIRI MRS Bar...
Context . Mid-infrared observations of photodissociation regions (PDRs) are dominated by strong emission features called aromatic infrared bands (AIBs). The most prominent AIBs found at 3.3, 6.2, 7.7, 8.6, and 11.2 µm. sensitive, highest-resolution spectral imaging data ever taken the prototypical PDR, Orion Bar, have been captured JWST. These high-quality allow for an unprecedentedly detailed view AIBs. Aims We provide inventory in along with mid-IR template spectra from five distinct Bar:...
Abstract The Vera C. Rubin Legacy Survey of Space and Time (LSST) holds the potential to revolutionize time domain astrophysics, reaching completely unexplored areas Universe mapping variability scales from minutes a decade. To prepare maximize LSST data for exploration transient variable Universe, one four pillars science, Transient Variable Stars Science Collaboration, eight Collaborations, has identified research interest requirements, paths enable them. While our roadmap is...
view Abstract Citations (137) References (34) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS How to Unveil a T Tauri Star Hartigan, Patrick ; Hartmann, Lee Kenyon, Scott Hewett, Robert Stauffer, John A method for separating the 'veiling' continuum often present in stars from underlying photospheric spectrum is described. Echelle observations 5100 6800 of partially veiled star BP Tau were analyzed determine shape veiling spectrum. The residuals fit indicate...
We have observed five classical T Tauri stars known to strong forbidden-line emission with STIS in slitless mode on the Hubble Space Telescope. This technique makes it possible image jets within a few tens of AU their exciting sources, region great interest for models accretion disks and jets. Slitless images generate emission-line at all wavelengths, including those where no narrowband filters exist. Images regions around each object, constructed by subtracting stellar continuum combining...
We present STIS spectral images of the HH 30 stellar jet taken through a wide slit over two epochs. The is unresolved spectrally, so observations produce emission-line for each line in spectrum. This rich data set shows how physical conditions vary with distance and time, produces precise proper motions knots within jet, resolves width close to star, gives spectrum reflected light from disk large wavelength range at several positions. introduce new method analyzing ratios based on minimizing...