Site Map
Follow us on Facebook Follow us on Twitter YouTube channel
Centro de Astrofísica da Universidade do Porto

The GAPS programme with HARPS-N at TNG
II. No giant planets around the metal-poor star HIP 11952

S. Desidera, A. Sozzetti, A. S. Bonomo, R. Gratton, E. Poretti, R. Claudi, D. W. Latham, L. Affer, R. Cosentino, M. Damasso, M. Esposito, P. Giacobbe, L. Malavolta, V. Nascimbeni, G. Piotto, M. Rainer, M. Scardia, V. S. Schmid, A. F. Lanza, G. Micela, I. Pagano, L. Bedin, K. Biazzo, F. Borsa, E. Carolo, E. Covino, F. Faedi, G. Hébrard, C. Lovis, A. Maggio, L. Mancini, F. Marzari, S. Messina, E. Molinari, U. Munari, F. Pepe, N. C. Santos, G. Scandariato, E. Shkolnik, J. Southworth

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.

stars: individual: HIP 11952 – techniques: radial velocities – planetary systems

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

Astronomy and Astrophysics
Volume 554, Page A29_1
June 2013

>> PDF>> ADS>> DOI

Institute of Astrophysics and Space Sciences

Institute of Astrophysics and Space Sciences (IA) is a new but long anticipated research infrastructure with a national dimension. It embodies a bold but feasible vision for the development of Astronomy, Astrophysics and Space Sciences in Portugal, taking full advantage and fully realizing the potential created by the national membership of the European Space Agency (ESA) and the European Southern Observatory (ESO). IA resulted from the merging the two most prominent research units in the field in Portugal: the Centre for Astrophysics of the University of Porto (CAUP) and the Center for Astronomy and Astrophysics of the University of Lisbon (CAAUL). It currently hosts more than two-thirds of all active researchers working in Space Sciences in Portugal, and is responsible for an even greater fraction of the national productivity in international ISI journals in the area of Space Sciences. This is the scientific area with the highest relative impact factor (1.65 times above the international average) and the field with the highest average number of citations per article for Portugal.

Proceed on CAUP's website|Go to IA website