Near-IR Observations of Vega-like Stars with the VLTI: β Pic α PsA, ɛ Eri, and τ Cet

Details Near-IR Observations of Vega-like Stars with the VLTI: β Pic α PsA, ɛ Eri, and τ Cet Near-IR Observations of Vega-like Stars with the VLTI: β Pic α PsA, ɛ Eri, and τ Cet

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219...75d&link_type=abstract

Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held

Astronomy and Astrophysics

Astronomy

Scientific paper

Debris disks around Vega-like stars have mainly been explored with sub-millimeter interferometers or visible and NIR coronagraphs which revealed the presence of cold dust in extended structures from ~20 AU to hundreds of AU from the stars. These optically thin disks are thought to be permanently replenished by comets or asteroids collisions in such forming planetary systems where exoplanets and disk asymmetries have recently been detected.
For the first time interferometric observations in the near-infrared with the VLTI allow to probe the very inner regions of the disks (up to a few AU) where hot dust is supposed to be found. Four of the nearest stars with debris disks (Beta Pictoris Fomalhaut Epsilon Eridani and Tau Ceti) have been observed with VINCI the VLTI commissioning instrument on various baselines in K and H bands.
Their fundamental parameters are measured and compared to those derived from the evolution models. We show how these observations can constraint the stellar photospheres and the presence of hot dust or faint companions in these planetary systems. Finally we discuss the detectability of disks and faint companions around these nearby stars with the future VLTI instruments

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