Date:
Tue, 15/03/201612:30-13:30
Location:
Kaplun building, Room No. 200
Lecturer: Dr. Flavian Kiefer
Affiliation: Tel-Aviv University
Abstract:
The young planetary system surrounding
Beta Pictoris harbors active minor bodies.
Spectroscopic observations of Beta Pictoris
reveal a high rate of transits of small
evaporating bodies, i.e. exo-comets (Kiefer
et al. 2014). I will report the analysis of
more than thousand spectra collected with
HARPS between 2003 and 2011, providing
a sample of about 6000 variable absorption
signatures due to transiting exocomets.
Statistical analysis of the observed
properties of these exocomets reveals that
they belong to two distinct populations with
highly different physical properties. A first
family, producing shallow absorption lines,
can be attributed to old exhausted comets,
possibly trapped in a mean motion
resonance with a massive planet; while a
second family, producing deep absorption
lines, is possibly related to the recent
fragmentation of a few parent bodies.
Additional details of the upcoming Astrophysics'
seminars can be found on the following link.
האירוע הזה כולל שיחת וידאו ב-Google Hangouts.
הצטרף: https://hangouts.google.com/hangouts/_/mail.huji.ac.il/astrophysics?hceid=bWFpbC5odWppLmFjLmlsX2c0czhydDlpcmhwZzRvdGNybWIzZGFqcjdvQGdyb3VwLmNhbGVuZGFyLmdvb2dsZS5jb20.7887en066ajhi8g240s6ja87sk&hs=121