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2012MNRAS.424.1714M - Mon. Not. R. Astron. Soc., 424, 1714-1722 (2012/August-2)
New observations of the PZ Tel system, its substellar companion and debris disc.
MUGRAUER M., ROLL T., GINSKI C., VOGT N., NEUHAUSER R. and SCHMIDT T.O.B.
Abstract (from CDS):
We also present new photometric measurements of PZ Tel just recently obtained by WISE, which clearly confirm that there is no excess emission in the spectral energy distribution (SED) of the star up to 24 µ m, while a prominent excess is detected at 70µm with MIPS/Spitzer.
To quantify the orbit elements of the PZ Tel system, we applied a least-squares Monte Carlo (LSMC) fit on all astrometric measures taken with NACO. The results of the performed LSMC fit are that one cannot yet determine a single `best'-fitting orbital solution, due to the poor astrometric coverage of the orbit. However, the obtained good LSMC solutions (
For e < 0.95, the PZ Tel system is seen nearly edge-on (92° ≲ i ≲ 110°), has a longitude of the ascending node of 50° ≲ Ω ≲ 65°, an argument of periastron 170° ≲ ω ≲ 290° and exhibits a semimajor axis a larger than about 20au, with the highest peak in the a-histogram located at about 25au (or about 110yr of orbital period), up to a few tens of au, as orbital solutions with a significantly larger semimajor axis would not be able to harbour a circumbinary disc which excites the observed excess in the SED of PZ Tel A.
Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society 2012 RAS
Journal keyword(s): binaries: visual - brown dwarfs - stars: individual: PZ Tel 32090027 Chile MU2695/13-1
Simbad objects: 11
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