منابع مشابه
The Unusual X-ray Spectrum of FU Orionis
FU Orionis objects (FUors) have undergone strong optical outbursts and are thought to be young low-mass stars accreting at high rates of up to Ṁacc ∼ 10 −4 M⊙ yr . FUors have been extensively studied at optical and infrared wavelengths, but little is known about their X-ray properties. We have thus initiated a program aimed at searching for and characterizing their X-ray emission. First results...
متن کاملThe spectroscopic signature of hot Jupiters in FU Orionis objects
We show that if FU Orionis objects harbour hot Jupiters embedded in their discs, the resulting non-axisymmetric dissipation profile in the disc would be manifest as time-dependent distortions in the absorption line profiles of these objects. In order to affect the infrared line profiles, planets must lie within ∼ 0.5 au of the central star, whereas only planets within ∼ 0.1 au would influence t...
متن کاملX-ray Emission from the FU Orionis Star V1735 Cygni
The variable star V1735 Cyg (= Elias 1-12) lies in the IC 5146 dark cloud and is a member of the class of FU Orionis objects whose dramatic optical brightenings are thought to be linked to episodic accretion. We report the first X-ray detections of V1735 Cyg and a deeply-embedded class I protostar lying 24 to its northeast. X-ray spectra obtained with EPIC on XMM-Newton reveal very hightemperat...
متن کاملGravitational Instabilities, Chondrule Formation, and the FU Orionis Phenomenon
Using analytic arguments and numerical simulations, we examine whether chondrule formation and the FU Orionis phenomenon can be caused by the burst-like onset of gravitational instabilities (GIs) in dead zones. At least two scenarios for bursting dead zones can work, in principle. If the disk is on the verge of fragmention, GI activation near r ∼ 4 to 5 AU can produce chondruleforming shocks, a...
متن کاملLong-term evolution of FU Orionis objects at infrared wavelengths
We investigate the brightness evolution of 7 FU Orionis systems in the 1−100μm wavelength range using data from the Infrared Space Observatory (ISO). The ISO measurements were supplemented with 2MASS and MSX observations performed in the same years as the ISO mission (1995−98). The spectral energy distributions (SEDs) based on these data points were compared with earlier ones derived from the I...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2006
ISSN: 0004-637X,1538-4357
DOI: 10.1086/502967