Many types of stars have strong magnetic fields that can dynamically influence the flow of
circumstellar matter. In stars with accretion disks, the stellar magnetic field can truncate the …

Context. Transition disks are protoplanetary disks with dust-depleted cavities, possibly
indicating substantial clearing of their dust content by a massive companion. For several …

ABSTRACT We present the Coordinated Synoptic Investigation of NGC 2264, a continuous
30 day multi-wavelength photometric monitoring campaign on more than 1000 young cluster …

We present mid-infrared spectra of T Tauri stars in the Taurus star-forming region obtained
with the Spitzer Infrared Spectrograph (IRS). For the first time, the 5-36 μm spectra of a large …

The inner 0.1 AU around accreting T Tauri stars hold clues to many physical processes that
characterize the early evolution of solar-type stars. The accretion-ejection connection takes …

Context. Accretion and ejection are complex and related processes that vary on various
timescales in young stars. Aims. We intend to investigate the accretion and outflow dynamics …

The physics of the hot spots on stellar surfaces and the associated variability of accreting
magnetized rotating stars is investigated for the first time using fully three-dimensional …

We present initial results from time-series imaging at infrared wavelengths of 0.9 deg 2 in the
Orion Nebula Cluster (ONC). During Fall 2009 we obtained 81 epochs of Spitzer 3.6 and 4.5 …

We present results of fully three-dimensional MHD simulations of disk accretion to a slowly
rotating magnetized star with its dipole moment inclined at an angle Θ to the rotation axis of …

Context. The young cluster NGC 2264 was observed with the CoRoT satellite for 23 days
uninterruptedly in March 2008 with unprecedented photometric accuracy. We present the …