Bibcode
Niedzielski, A.; Villaver, E.; Wolszczan, A.; Adamów, M.; Kowalik, K.; Maciejewski, G.; Nowak, G.; García-Hernández, D. A.; Deka, B.; Adamczyk, M.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 573, id.A36, 11 pp.
Fecha de publicación:
1
2015
Revista
Número de citas
34
Número de citas referidas
32
Descripción
Context. Stars that have evolved off the main sequence are crucial for
expanding the frontiers of knowledge on exoplanets toward higher stellar
masses and for constraining star-planet interaction mechanisms. These
stars have an intrinsic activity, however, which complicates the
interpretation of precise radial velocity (RV) measurements, and
therefore they are often avoided in planet searches. Over the past ten
years, we have monitored about 1000 evolved stars for RV variations in
search for low-mass companions under the Penn State - Toruń
Centre for Astronomy Planet Search program with the Hobby-Eberly
Telescope. Selected prospective candidates that required higher RV
precision measurements have been followed with HARPS-N at the 3.6 m
Telescopio Nazionale Galileo. Aims: We aim to detect planetary
systems around evolved stars, to be able to build sound statistics on
the frequency and intrinsic nature of these systems, and to deliver
in-depth studies of selected planetary systems with evidence of
star-planet interaction processes. Methods: We obtained 69 epochs
of precise RV measurements for TYC 1422-614-1 collected over 3651 days
with the Hobby-Eberly Telescope, and 17 epochs of ultra-precise HARPS-N
data collected over 408 days. We complemented these RV data with
photometric time-series from the All Sky Automatic Survey archive. Results: We report the discovery of a multiple planetary system
around the evolved K2 giant star TYC 1422-614-1. The system orbiting the
1.15 M⊙ star is composed of a planet with mass msini =
2.5 MJ in a 0.69 AU orbit, and a planet or brown dwarf with
msini = 10 MJ in an orbit of 1.37 AU. The multiple planetary
system orbiting TYC 1422-614-1 is the first finding of the TAPAS
project, a HARPS-N monitoring of evolved planetary systems identified
with the Hobby-Eberly Telescope.
Based on observations obtained with the Hobby-Eberly Telescope, which is
a joint project of the University of Texas at Austin, the Pennsylvania
State University, Stanford University,
Ludwig-Maximilians-Universität München, and
Georg-August-Universität Göttingen.Based on observations made
with the Italian Telescopio Nazionale Galileo (TNG) operated on the
island of La Palma by the Fundación Galileo Galilei of the INAF
(Istituto Nazionale di Astrofisica) at the Spanish Observatorio del
Roque de los Muchachos of the Instituto de Astrofísica de
Canarias.Tables 2 and 3 are available in electronic form at http://www.aanda.org
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