Fundamental parameters and infrared excesses of Tycho-Gaia stars
  Effective temperatures and luminosities are calculated for 1,475,921 Tycho-2
and 107,145 Hipparcos stars, based on distances from Gaia Data Release 1.
Parameters are derived by comparing multi-wavelength archival photometry to
BT-Settl model atmospheres. The 1-sigma uncertainties for the Tycho-2 and
Hipparcos stars are +/-137 K and +/-125 K in temperature and +/-35 per cent and
+/-19 per cent in luminosity. The luminosity uncertainty is dominated by that
of the Gaia parallax. Evidence for infrared excess between 4.6 and 25 microns
is found for 4256 stars, of which 1883 are strong candidates. These include
asymptotic giant branch (AGB) stars, Cepheids, Herbig Ae/Be stars, young
stellar objects, and other sources. We briefly demonstrate the capabilities of
this dataset by exploring local interstellar extinction, the onset of dust
production in AGB stars, the age and metallicity gradients of the solar
neighbourhood and structure within the Gould Belt. We close by discussing the
potential impact of future Gaia data releases.
