Bibcode
Desidera, S.; Sozzetti, A.; Bonomo, A. S.; Gratton, R.; Poretti, E.; Claudi, R.; Latham, D. W.; Affer, L.; Cosentino, R.; Damasso, M.; Esposito, M.; Giacobbe, P.; Malavolta, L.; Nascimbeni, V.; Piotto, G.; Rainer, M.; Scardia, M.; Schmid, V. S.; Lanza, A. F.; Micela, G.; Pagano, I.; Bedin, L. R.; Biazzo, K.; Borsa, F.; Carolo, E.; Covino, E.; Faedi, F.; Hébrard, G.; Lovis, C.; Maggio, A.; Mancini, L.; Marzari, F.; Messina, S.; Molinari, E.; Munari, U.; Pepe, F.; Santos, N.; Scandariato, G.; Shkolnik, E.; Southworth, J.
Bibliographical reference
Astronomy and Astrophysics, Volume 554, id.A29, 5 pp.
Advertised on:
6
2013
Journal
Citations
32
Refereed citations
29
Description
In the context of the programme Global Architecture of Planetary Systems
(GAPS), we have performed radial velocity monitoring of the metal-poor
star HIP 11952 on 35 nights during about 150 days using the newly
installed high-resolution spectrograph HARPS-N at the TNG and HARPS at
the ESO 3.6 m telescope. The radial velocities show a scatter of 7 m
s-1, compatible with the measurement errors for such a
moderately warm metal-poor star (Teff = 6040 ± 120 K;
[Fe/H] = -1.9 ± 0.1). We exclude the presence of the two giant
planets with periods of 6.95 ± 0.01 d and 290.0 ± 16.2 d
and radial velocity semi-amplitudes of 100.3 ± 19.4 m
s-1 and 105.2 ± 14.7 m s-1, respectively,
which have recently been announced. This result is important because HIP
11952 was thought to be the most metal-poor star hosting a planetary
systemwith giant planets, which challenged some models of planet
formation.
Based on observations made with the Italian Telescopio Nazionale Galileo
(TNG) operated on the island of La Palma by the Fundacion Galileo
Galilei of the INAF at the Spanish Observatorio del Roque de los
Muchachos of the IAC in the frame of the programme Global Architecture
of Planetary Systems (GAPS). Based on observations collected at the La
Silla Observatory, ESO (Chile): Program 185.D-0056.Table 1 is available
in electronic form at http://www.aanda.org
Related projects
Very Low Mass Stars, Brown Dwarfs and Planets
Our goal is to study the processes that lead to the formation of low mass stars, brown dwarfs and planets and to characterize the physical properties of these objects in various evolutionary stages. Low mass stars and brown dwarfs are likely the most numerous type of objects in our Galaxy but due to their low intrinsic luminosity they are not so
Rafael
Rebolo López