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Proposal Identification No.:

A2005

Date Received:

2004-Sep-29 18:51:13

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Prop osal Title: ABSTRACT: Regular Astronomy Continuum Galactic 42 Hours

The Origin of Magnetic Activity in Sub-Stellar Ob jects

The pro cesses of magnetic field generation, amplification and dissipation in sub-stellar ob jects are not understo o d, but could provide direct information on the internal convection and the structure of the atmosphere. The detection of radio emission from four late-M and L dwarfs by us and collab orators indicates that contrary to theoretical exp ectations and observations in other bands (H, X-rays), magnetic activity may b e prevalent in sub-stellar ob jects. The enormous disjoint b etween the radio and H/X-ray emission (a factor of 10 4 ) suggests that the magnetic dynamo may differ from that in early-typ e stars and thus require full observational insp ection. Here we prop ose observations in the X-band with the WAPP correlator of 23 nearby L and T dwarfs to characterize the statistics of radio emission, determine a p ossible correlation with other physical prop erties (e.g., rotation) which might shed light on the nature of the magnetic dynamo, and assess the role of coherent emission in addition to the synchrotron radiation observed to date. With these observations we can for the first time investigate rapidly-varying flares with high sp ectral resolution, and at the same time detect faint p ersistent emission.

Name Edo Berger

Institution Carnegie Observatories

E-mail eberger@ociw.edu

Phone 626-304-0251

Student no

Service Observing Request

Remot e Observing Request

X

None All of the observing run. Part of the observing run. Queue Observing

X

No Maybe Yes

Instrument Setup
X-high Atmospheric Observation Instruments:

1


Sp ecial Equipment or setup:

none

RFI Considerations Frequency Ranges Planned

2