Simultaneous X-ray, radio, near-infrared, and optical monitoring of Young Stellar Objects in the Coronet cluster

Abstract

Multi-wavelength (X-ray to radio) monitoring of Young Stellar Objects (YSOs) can provide important information about physical processes at the stellar surface, in the stellar corona, and/or in the inner circumstellar disk regions. While coronal processes should mainly cause variations in the X-ray and radio bands, accretion processes may be traced by time-correlated variability in the X-ray and optical/infrared bands. Several multi-wavelength studies have been successfully performed for field stars and approx. 1-10 Myr old T Tauri stars, but so far no such study succeeded in detecting simultaneous X-ray to radio variability in extremely young objects like class I and class 0 protostars. Here we present the first simultaneous X-ray, radio, near-infrared, and optical monitoring of YSOs, targeting the Coronet cluster in the Corona Australis star-forming region, which harbors at least one class 0 protostar, several class I objects, numerous T Tauri stars, and a few Herbig AeBe stars. [...] Seven objects are detected simultaneously in the X-ray, radio, and optical/infrared bands; they constitute our core sample. While most of these sources exhibit clear variability in the X-ray regime and several also display optical/infrared variability, none of them shows significant radio variability on the timescales probed. We also do not find any case of clearly time-correlated optical/infrared and X-ray variability. [...] The absence of time-correlated multi-wavelength variability suggests that there is no direct link between the X-ray and optical/infrared emission and supports the notion that accretion is not an important source for the X-ray emission of these YSOs. No significant radio variability was found on timescales of days.

arXiv comment11 pages, 11 figures, accepted for publication in A&A (06 Dec 2006)

References in corpus (17)

• The Origin of T Tauri X-ray Emission: New Insights from the Chandra Orion Ultradeep Project
• X-ray astronomy of stellar coronae (Review)
• Evidence for Accretion: High-Resolution X-ray Spectroscopy of the Classical T Tauri Star TW Hydrae
• Chandra Orion Ultradeep Project: Observations and Source Lists
• Stellar Radio Astronomy. Probing Stellar Atmospheres from Protostars to Giants
• X-rays from accretion shocks in T Tauri stars: The case of BP Tau
• The Magnetic Properties of an L Dwarf Derived from Simultaneous Radio, X-ray, and H-alpha Observations
• A Giant Outburst at Millimeter Wavelengths in the Orion Nebula
• X-ray emission from T Tauri stars
• Search for young stars among ROSAT All-Sky Survey X-ray sources in and around the R CrA dark cloud
• Simultaneous Chandra and VLA Observations of Young Stars and Protostars in rho Ophiuchus Cloud Core A
• A Simultaneous Optical and X-ray Variability Study of the Orion Nebula Cluster. I. Incidence of Time-Correlated X-ray/Optical Variations
• Radio and X-ray variability of Young Stellar Objects in the Coronet Cluster
• Discovery of Extremely Embedded X-ray Sources in the R Coronae Australis Star Forming Core
• New Perspectives on the X-ray Emission of HD 104237 and Other Nearby Herbig Ae/Be Stars from XMM-Newton and Chandra
• V1647 Ori (IRAS 05436-0007) in Outburst: the First Three Months
• The weak-line T Tauri star V410Tau I. A multi-wavelength study of variability

Cited by in corpus (32)

• Protoplanetary Disk Properties in the Orion Nebula Cluster: Initial Results from Deep, High-Resolution ALMA Observations
• The Spitzer Survey of Interstellar Clouds in the Gould Belt. III. A Multi-Wavelength View of Corona Australis
• Corona-Australis DANCe. I. Revisiting the census of stars with Gaia-DR2 data
• Coronae in the Coronet: A very deep X-ray look into a stellar nursery
• Mid-Infrared Spectral Variability Atlas of Young Stellar Objects
• Time Monitoring of Radio Jets and Magnetospheres in the Nearby Young Stellar Cluster R Coronae Australis
• The Young Binary DQ Tau: A Hunt For X-ray Emission From Colliding Magnetospheres
• High Spatial Resolution Observations of Two Young Protostars in the R Corona Australis Region
• Protoplanetary Disks in the Orion OMC1 Region Imaged with ALMA
• Microwave Observations of Edge-on Protoplanetary Disks: Program Overview and First Results
• VLTI/MIDI atlas of disks around low- and intermediate-mass young stellar objects
• Multiwavelength Signatures of Magnetic Activity from Young Stellar Objects in the LkH\alpha101 Cluster
• The role of low-mass star clusters in massive star formation. The Orion Case
• Centimeter Imaging of the R Coronae Australis Region
• Short- and long-term variability of young stars in the Orion Nebula Cluster and Molecular Cloud
• Extreme radio flares and associated X-ray variability from young stellar objects in the Orion Nebula Cluster
• Connecting X-ray and Infrared Variability among Young Stellar Objects: Ruling out potential sources of disk fluctuations
• Simultaneous X-ray and radio observations of Young Stellar Objects in NGC 1333 and IC 348
• Testing protoplanetary disc dispersal with radio emission
• Radio continuum imaging of the R CrA star-forming region with the ATCA
• Constraints on photoevaporation models from (lack of) radio emission in the Corona Australis protoplanetary disks
• Hunting for millimeter flares from magnetic reconnection in pre-main sequence spectroscopic binaries
• A Very Long Baseline Interferometry Detection of the Class I Protostar IRS 5 in Corona Australis
• Centimeter Polarimetry of the R Coronae Australis Region
• Time-monitoring Observations of Br$\gamma$ Emission from Young Stars
• The Radio-X-ray Connection in Young Stellar Objects in the Orion Nebula Cluster
• Variability of the SiO thermal line emission toward the young L1448-mm outflow
• Resolving a Class I Protostar Binary System with Chandra
• Linking ice and gas in the Coronet cluster in Corona Australis
• Time-monitoring Observations of the Ro-Vibrational Overtone CO bands in Young Stars
• A Dual-Band Centimetre Continuum Monitoring Survey of Young Stellar Objects in the Coronet Cluster
• FORCAST imaging of two small nearby Clusters: The Coronet and B59