Volume 523, November-December 2010
|Number of page(s)||4|
|Published online||10 November 2010|
Letter to the Editor
Direct detection of a substellar companion to the young nearby star PZ Telescopii⋆
Astrophysikalisches Institut und Universitäts-Sternwarte Jena,
2 Departamento de Física y Astronomía, Universidad de Valparaíso, Avenida Gran Bretaña 1111, Valparaíso, Chile
3 Instituto de Astronomía, Universidad Catolica del Norte, Avda. Angamos 0610, Antofagasta, Chile
Accepted: 25 August 2010
Aims. We study the formation of substellar objects (exoplanets and brown dwarfs) that are companions to young nearby stars.
Methods. With high-contrast AO imaging obtained with NACO at ESO VLT, we search for faint companion candidates around our targets, whose companionship can be confirmed with astrometry.
Results. We identified a faint substellar companion to the nearby pre-main sequence star PZ Tel, a member of the β Pic moving group. The companion is 5–6 mag fainter than its host star in JHK and is located at a separation of only 0.3 arcsec (or 15 AU of projected separation) northeast of PZ Tel. Within three NACO observing epochs, we can confirm the common proper motion (>39σ) and detected orbital motion of PZ Tel B around its primary (>37σ). The photometry of the newly found companion is consistent with a brown dwarf with a mass between 24 and 40MJup, at the distance (50 pc) and age (8−20 Myr) of PZ Tel. The effective temperature of the companion, derived from its photometry, ranges between 2500 and 2700 K, which corresponds to a spectral type between M6 and M8. After β Pic b, PZ Tel B is the second closest substellar companion imaged directly around a young star.
Key words: stars: individual: PZ telescopii / brown dwarfs
© ESO, 2010
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.