Journal Article10.1086/305032
Disk accretion rates for T tauri stars
Erik Gullbring,Lee Hartmann,Cesar Briceno,Cesar Briceno,Cesar Briceno,Nuria Calvet,Nuria Calvet +6 more
TL;DR: In this paper, the authors present new measurements of disk accretion rates for T Tauri stars in the Taurus molecular cloud complex, which are based on intermediate-resolution spectrophotometry from 3200 to 5200 A, and derive the excess hot continuum emission produced by accretion onto the central star.
read more
Abstract: We present new measurements of disk accretion rates for T Tauri stars in the Taurus molecular cloud complex. Our results are based on intermediate-resolution spectrophotometry from 3200 to 5200 A, which is used to derive the excess hot continuum emission produced by accretion onto the central star. Previous estimates of T Tauri accretion rates in the literature differ by as much as 1 order of magnitude; our measurements agree better with the lowest estimates, and we discuss the problems and systematic effects that led to the previous disagreement. In particular, we note that the stellar photospheric emission from nonaccreting T Tauri stars exhibits color anomalies compared to main-sequence stars; these anomalies make the estimated extinction depend upon the color index used. We argue that the V-R index is a reasonable compromise to match with optically derived spectral types, and that V-I and V-J are much more likely to be biased by cooler companion stars and starspots. We develop a calibration with which approximate mass accretion rates can be derived for T Tauri stars based on broadband photometry and spectral types, which should enable accretion rates to be estimated for large samples with greater ease.
read more
Chat with Paper
AI Agents for this Paper
Find similar papers on Google Scholar, PubMed and Arxiv
Write a critical review of this paper
Analyze citations of this paper to find unaddressed research gaps
Citations
The different evolution of gas and dust in disks around sun-like and cool stars
Ilaria Pascucci,Daniel Apai,Kevin Luhman,Th. Henning,Jeroen Bouwman,Michael R. Meyer,Fred Lahuis,Antonella Natta +7 more
TL;DR: In this article, a comparative study of the dust and gas properties of disks around young Sun-like stars (K1-M5) and brown stars/brown dwarfs (M5-M9) is presented.
Multicolor Variability of Young Stars in the Lagoon Nebula: Driving Causes and Intrinsic Timescales
Laura Venuti,Ann Marie Cody,Luisa Rebull,Giacomo Beccari,Mike Irwin,Sowmya Thanvantri,Steve B. Howell,Geert Barentsen +7 more
TL;DR: In this paper, the authors present a new study of young star variability in the Lagoon Nebula region, which consists of 278 young, late-B to K-type stars, monitored with Kepler/K2.
A long-lasting quiescence phase of the eruptive variable V1118 Ori
D. Lorenzetti,Simone Antoniucci,T. Giannini,Avet Harutyunyan,Arkady A. Arkharov,Valeri M. Larionov,Valeri M. Larionov,Felice Cusano,A. Di Paola,G. Li Causi,Brunella Nisini,Roberto Speziali,Fabrizio Vitali +12 more
TL;DR: In this paper, the authors present near-infrared photometry of V1118 Ori carried out over the last eight years, along with complete spectroscopic coverage from 0.35 to 2.5?m.
Passive irradiated circumstellar disks with an inner hole
TL;DR: In this article, a model for irradiated dust disks around Herbig Ae stars is proposed, based on the flaring disk model of Chiang & Goldreich (1997), but with the central regions of the disk removed.
The Thermal Regulation of Gravitational Instabilities in Protoplanetary Disks. II. Extended Simulations with Varied Cooling Rates
TL;DR: In this paper, the authors extended their three-dimensional hydrodynamic simulations of protoplanetary disks from a previous paper to determine the asymptotic behavior of GIs and how it is affected by different constant cooling times.
References
Interstellar dust and extinction
TL;DR: The ultraviolet (UV) region of the spectrum has been crucial in providing information on the nature of the material and size distribution of the particles of interstellar dust before there were any measurements of the UV properties of interstellar extinction as mentioned in this paper.
1.5K
Accretion by rotating magnetic neutron stars. III. Accretion torques and period changes in pulsating X-ray sources.
Pranab Ghosh,F. K. Lamb +1 more
TL;DR: In this article, the solutions of the two-dimensional hydromagnetic equations are used to calculate the torque on a magnetic neutron star accreting from a Keplerian disk, revealing that the magnetic coupling between the star and the plasma in the outer transition zone is appreciable; as a result, the spin-up torque on fast rotators is substantially less than that on slow rotators, and that for sufficiently high stellar angular velocities or sufficiently low mass accretion rates, the rotation of the star can be braked while accretion continues.
1.1K
Disk accretion onto magnetic T Tauri stars
TL;DR: In this article, the dynamical and radiative consequences of disk accretion onto magnetic T T Tauri stars (TTS) were examined using the Ghosh and Lamb model, and it was shown that a prolonged disk accuration phase is compatible with the low rotation rates measured in these stars if they possess a kilogauss strength field that disrupts the disk at a distance of a few stellar radii from the center.
1.1K