author={Attila Juh{\'a}sz and Cornelis Petrus Dullemond and Roy Van Boekel and Jeroen Bouwman and P{\'e}ter {\'A}brah{\'a}m and J. A. Acosta-Pulido and T Henning and {\'A}. K{\'o}sp{\'a}l and A. Sicilia-Aguilar and A Jones and Attila Mo{\'o}r and L{\'a}szl{\'o} Mosoni and Zs. Reg{\'a}ly and Gyula Pal Szokoly and Nikoletta Sipos},
  journal={The Astrophysical Journal},
EX Lup is the prototype of the EXor class of eruptive young stars. These objects show optical outbursts which are thought to be related to runaway accretion onto the star. In a previous study we observed in situ crystal formation in the disk of EX Lup during its latest outburst in 2008, making the object an ideal laboratory to investigate circumstellar crystal formation and transport. This outburst was monitored by a campaign of ground-based and Spitzer Space Telescope observations. Here we… 
Spectral Evolution and Radial Dust Transport in the Prototype Young Eruptive System EX Lup
EX Lup is the prototype of a class of pre-main-sequence eruptive stars defined by their repetitive outbursts lasting several months. In 2008 January–September EX Lup underwent its historically
Depletion of molecular gas by an accretion outburst in a protoplanetary disk
We investigate new and archival 3–5 μm high-resolution (∼3 km s−1) spectroscopy of molecular gas in the inner disk of the young solar-mass star EX Lupi, taken during and after the strong accretion
Outbursts of young Sun-like stars may change how terrestrial planets form
Abstract While the Sun is nowadays a quiet and well-balanced star, in its first few million years it might have been often out of temper, like those young low-mass stars which episodically undergo
Chemical Signatures of the FU Ori Outbursts
The FU Ori–type young stellar objects are characterized by a sudden increase in luminosity by 1–2 orders of magnitude followed by a slow return to the pre-outburst state on timescales of ∼10–100 yr.
The Circumstellar Disk and Asymmetric Outflow of the EX Lup Outburst System
We present Atacama Large Millimeter/submillimeter Array (ALMA) observations at 0.″3 resolution of EX Lup, the prototype of the EXor class of outbursting pre-main-sequence stars. The circumstellar
Radial velocity variations in the young eruptive star EX Lupi
Context. EX Lup-type objects (EXors) are low-mass pre-main sequence objects characterized by optical and near-infrared outbursts attributed to highly enhanced accretion from the circumstellar disk
The circumstellar environment of EX Lupi: SPHERE and SINFONI views
Context. EX Lup is a well-studied T Tauri star that represents the prototype of young eruptive stars known as EXors. They are characterized by repetitive outbursts that are due to enhanced accretion
Dynamics during outburst: VLTI observations of the young eruptive star V1647 Orionis during its 2003-2006 outburst
Context. It is hypothesized that low-mass young stellar objects undergo eruptive phases during their early evolution. These eruptions are thought to be caused by highly increased mass accretion from
The Outburst of the Young Star Gaia19bey
We report photometry and spectroscopy of the outburst of the young stellar object Gaia19bey. We have established the outburst light curve with archival Gaia “G,” ATLAS “Orange,” Zwicky Transient
We present a comparison of archival Spitzer spectra of the strongly variable T Tauri EX Lupi, observed before and during its 2008 outburst. We analyze the mid-infrared emission from gas-phase


The 2008 Extreme Outburst of the Young Eruptive Variable Star EX Lupi
In early 2008, the young low-mass star EX Lupi, the prototype of the EXor class of eruptive variables, optically brightened by over 5 mag for a period of seven months. The previous time a change of
Near-infrared spectroscopy of EX Lupi in outburst
EX Lup is the prototype of the EXor class of young eruptive stars: objects showing repetitive brightenings due to increased accretion from the circumstellar disk to the star. In this paper, we report
EX Lupi in quiescence
Aims. EX Lupi is the prototype of EXors, a subclass of low-mass pre-main sequence stars whose episodic eruptions are attributed to temporarily increased accretion. In quiescence the optical and
Episodic formation of cometary material in the outburst of a young Sun-like star
Mid-infrared features in the outburst spectrum of the young Sun-like star EX Lupi that were not present in quiescence are reported and it is concluded that the crystals were produced through thermal annealing in the surface layer of the inner disk by heat from the outburst, a process that has hitherto not been considered.
Fundamental vibrational transition of CO during the outburst of EX Lupi in 2008
We report monitoring observations of the T Tauri star EX Lupi during its outburst in 2008 in the CO fundamental band at 4.6–5.0 μm. The observations were carried out at the Very Large Telescope and
Evolution of Dust and Ice Features around FU Orionis Objects
We present spectra for a sample of 14 FUors and two T Tauri stars observed with Spitzer or ISO. Based on the appearance of the 10 μm silicate feature, we define two categories of FUors. Objects
Probing Protoplanetary Disks with Silicate Emission: Where Is the Silicate Emission Zone?
Recent results indicate that the grain size and crystallinity inferred from observations of silicate features may be correlated with the spectral type of the central star and/or disk geometry. In
Crystalline Silicates and Dust Processing in the Protoplanetary Disks of the Taurus Young Cluster
We characterize the crystalline-silicate content and spatial distribution of small dust grains in a large sample of protoplanetary disks in the Taurus-Auriga young cluster, using the Spitzer Space
The Formation and Evolution of Planetary Systems: Grain Growth and Chemical Processing of Dust in T Tauri Systems
This paper is one in a series presenting results obtained within the Formation and Evolution of Planetary Systems (FEPS) Legacy Science Program on the Spitzer Space Telescope. Here we present a study
Dust Evolution in Protoplanetary Disks Around Herbig Ae/Be Stars—the Spitzer View
In this paper, we present mid-infrared spectra of a comprehensive set of Herbig Ae/Be stars observed with the Spitzer Space Telescope. The signal-to-noise ratio of these spectra is very high, ranging