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Astronomy Tea Talks at Caltech

Mondays, Robinson 106
Tea:  4.00pm
Talk: 4.15pm

Organized by:

2008 - 2009 season:
12 January 2009 Demerese Salter (Leiden)

"Captured at millimeter wavelengths: a flare from the Classical T Tauri Star DQ Tau"

For several hours on 2008 April 19 the T Tauri spectroscopic
binary DQ Tau was observed to brighten, reaching a maximum detected flux
of 468mJy and likely making it (briefly) the brightest object at 3mm in
the Taurus star-forming region. I will present the light curve of a rarely
before observed millimeter flare originating in the region around a
pre-main-sequence star, and the first from a classical T Tauri star. I
will discuss the properties and nature of the flaring behavior in the
context of pulsed accretion flows (the current picture based largely on
studies of this object~Rs optically variable spectrum), as well as
magnetospheric re-connection models (a separate theory that predicts
millimeter flares for close binaries of high orbital eccentricity). We
believe that the flare mechanism is linked to the binary orbit, and
therefore periodic. DQ Tau makes a strong case for multi-wavelength
follow-up studies, performed in parallel, of future flares to help
determine whether magnetospheric and dynamical interactions in a
proto-binary system are independent.

Additional Notes: "Accepted to A&A Letters and listed on astro-ph at
http://arxiv.org/abs/0810.4162"

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Last modified on 20th Jul 2011 by Scott Schnee.  

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