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Proposal Identification No.: A2005 Date Received: 2004­Sep­29 18:51:13
Technical Page
Proposal Type: Regular
General Category: Astronomy
Sub­Category: Continuum
Observation Category: Galactic
Total Time Requested: 42 Hours
Proposal Title: The Origin of Magnetic Activity in Sub­Stellar Objects
ABSTRACT:
The processes of magnetic field generation, amplification and dissipation in sub­stellar objects are not understood,
but could provide direct information on the internal convection and the structure of the atmosphere. The detection
of radio emission from four late­M and L dwarfs by us and collaborators indicates that contrary to theoretical
expectations and observations in other bands (H#, X­rays), magnetic activity may be prevalent in sub­stellar
objects. The enormous disjoint between the radio and H#/X­ray emission (a factor of 10 4 ) suggests that the
magnetic dynamo may di#er from that in early­type stars and thus require full observational inspection. Here we
propose observations in the X­band with the WAPP correlator of 23 nearby L and T dwarfs to characterize the
statistics of radio emission, determine a possible correlation with other physical properties (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
rapidly­varying flares with high spectral resolution, and at the same time detect faint persistent emission.
Name Institution E­mail Phone Student
Edo Berger Carnegie Observato­
ries
eberger@ociw.edu 626­304­0251 no
Service Observing Request Remot e Observing Request
X None X No
All of the observing run. Maybe
Part of the observing run. Yes
Queue Observing
Instrument Setup
X­high
Atmospheric Observation Instruments:
1

Special Equipment or setup: none
RFI Considerations
Frequency Ranges Planned
2