341 citations · 3.7k across the 91 of their papers we have counts for
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JWST/MIRI Detection of Molecular H Winds from an Edge-on Class II Source HV Tau C
Vinod Chandra Pathak, P. Manoj, Himanshu Tyagi +14
The evolution of protoplanetary disks is regulated by accretion onto the central star and mass loss through jets and winds. While atomic and ionized outflows are commonly observed,…
MINDS survey of silicates in T Tauri disks: Correlation between dust and gas
J. Varga, Th. Henning, L. B. F. M. Waters +20
Context. Silicates are key constituents of planet-forming disks and major building blocks of rocky planets. Mid-infrared spectral features of micron-sized silicate grains trace gra…
JOYS: Disentangling the warm and cold material in the high-mass IRAS 23385+6053 cluster
C. Gieser, H. Beuther, E. F. van Dishoeck +20
(abridged) We study and compare the warm (>100 K) and cold (<100 K) material toward the high-mass star-forming region IRAS 23385+6053 (IRAS 23385 hereafter) combining high angular…
The post-disk (or primordial) spin distribution of M dwarf stars
L. Gehrig, E. Gaidos, M. Güdel
We investigate the influence of an accretion disk on the angular momentum (AM) evolution of young M dwarfs, which parameters govern the AM distribution after the disk phase, and wh…
Complete X-ray census of Mdwarfs in the solar Neighborhood I. GJ 745 AB: Coronal-hole Stars in the 10 pc Sample
M. Caramazza, B. Stelzer, E. Magaudda +4
We have embarked in a systematic study of the X-ray emission in a volume-limited sample of M dwarf stars, in order to explore the full range of activity levels present in their cor…
A systematic survey of millimetre-wavelength flaring variability of Young Stellar Objects in the Orion Nebula Cluster
J. Vargas-González, J. Forbrich, V. M. Rivilla +3
High-energy processes are ubiquitous even in the earliest stages of protostellar evolution. Motivated by the results of our systematic search for intense centimeter radio flares in…
A search for thermal gyro-synchrotron emission from hot stellar coronae
Walter W. Golay, Robert L. Mutel, Dani Lipman +1
We searched for thermal gyro-synchrotron radio emission from a sample of five radio-loud stars whose X-ray coronae contain a hot ( K) thermal component. We used the JVLA…
The effect of metallicity on the abundances of molecules in protoplanetary disks
R. Guadarrama, Eduard I. Vorobyov, Christian Rab +1
We study the influence of different metallicities on the physical, thermal, and chemical properties of protoplanetary disks, and in particular on the formation and destruction of c…
Time-dependent, long-term hydrodynamic simulations of the inner protoplanetary disk II: The importance of stellar rotation
Lukas Gehrig, Daniel Steiner, Eduard Vorobyov +1
The spin evolution of young protostars, surrounded by an accretion disk, still poses problems for observations and theoretical models. In recent studies, the importance of the magn…
Time-dependent, long-term hydrodynamic simulations of the inner protoplanetary disk I: The importance of stellar magnetic torques
D. Steiner, L. Gehrig, B. W. Ratschiner +4
We conduct simulations of the inner regions of protoplanetary disks (PPDs) to investigate the effects of protostellar magnetic fields on their long-term evolution. We use an inner…
The active lives of stars: a complete description of rotation and XUV evolution of F, G, K, and M dwarfs
Colin P. Johnstone, Michael Bartel, Manuel Güdel
Aims. We study the evolution of rotation and high energy X-ray, extreme ultraviolet (EUV), and Ly-alpha emission for F, G, K, and M dwarfs, with masses between 0.1 and 1.2 Msun, an…
XMM-Newton X-ray Observations of LkCa 15: A T Tauri Star With a Formative Planetary System
Stephen L. Skinner, Manuel Guedel
High-resolution ground-based images of the T Tauri star LkCa 15 have revealed multiple companions that are thought to comprise a formative planetary system. The candidate protoplan…
Stellar energetic particle ionization in protoplanetary disks around T Tauri stars
Ch. Rab, M. Güdel, M. Padovani +4
Anomalies in the abundance measurements of short lived radionuclides in meteorites indicate that the protosolar nebulae was irradiated by a high amount of energetic particles (E$\g…
A gas density drop in the inner 6 AU of the transition disk around the Herbig Ae star HD 139614: Further evidence for a giant planet inside the disk?
A. Carmona, W. F. Thi, I. Kamp +16
Context: Quantifying the gas content inside the dust gaps of transition disks is important to establish their origin. Aims: We seek to constrain the surface density of warm gas in…
The feedback of atomic jets from embedded protostars in NGC 1333
Odysseas Dionatos, Manuel Güdel
Star-formation feedback onto the parent cloud is conventionally examined through the study of molecular outflows. Little is however known on the effect that atomic ejecta, tracing…
Chandra and XMM-Newton X-ray Observations of the Hyperactive T Tauri Star RY Tau
Stephen L. Skinner, Marc Audard, Manuel Guedel
We present results of pointed X-ray observations of the accreting jet-driving T Tauri star RY Tau using Chandra and XMM-Newton. We obtained high-resolution grating spectra and exce…
A Chandra Observation of the Eclipsing Wolf-Rayet Binary CQ Cep
S. L. Skinner, S. A. Zhekov, M. Guedel +1
The short-period (1.64 d) near-contact eclipsing WN6+O9 binary system CQ Cep provides an ideal laboratory for testing the predictions of X-ray colliding wind shock theory at close…
X-ray emission from an FU Ori star in early outburst: HBC 722
Armin Liebhart, Manuel Guedel, Stephen Skinner +1
Aims: We conducted the first X-ray observations of the newly erupting FU Ori-type outburst in HBC 722 (V2493 Cyg) with the aim to characterize its X-ray behavior and near-stellar e…
First Detection of Thermal Radio Emission from Solar-Type Stars with the Karl G. Jansky Very Large Array
Jackie Villadsen, Gregg Hallinan, Stephen Bourke +2
We present the first detections of thermal radio emission from the atmospheres of solar-type stars τ Cet, η Cas A, and 40 Eri A. These stars all resemble the Sun in age and level o…
Wideband Dynamic Radio Spectra of Two Ultra-cool dwarfs
C. Lynch, R. L. Mutel, M. Gudel
A number of radio-loud ultra cool dwarf stars (UCD) exhibit both continuous broadband and highly polarized pulsed radio emission. In order to determine the nature of the emission a…
Chandra Resolves the T Tauri Binary System RW Aur
Stephen L. Skinner, Manuel Guedel
RW Aur is a multiple T Tauri system consisting of an early-K type primary (A) and a K5 companion (B) at a separation of 1.4 arcsec. RW Aur A drives a bipolar optical jet that is we…
Jets and Outflows From Star to Cloud: Observations Confront Theory
A. Frank, T. P. Ray, S. Cabrit +10
In this review we focus on the role jets and outflows play in the star and planet formation process. Our essential question can be posed as follows: are jets/outflows merely an epi…
An X-ray and Infrared Survey of the Lynds 1228 Cloud Core
Stephen Skinner, Luisa Rebull, Manuel Guedel
The nearby Lynds 1228 (L1228) dark cloud at a distance of ~200 pc is known to harbor several young stars including the driving sources of the giant HH 199 and HH 200 Herbig-Haro ou…
DN Tauri - coronal activity and accretion in a young low-mass CTTS
J. Robrade, M. Guedel, H. M. Guenther +1
We present a deep XMM-Newton observation of DN Tau, a young M0-type accreting CTTS and investigate its X-ray properties and X-ray generating mechanisms. Specifically we examine the…