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

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.

Abstract

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 system with giant planets, which challenged some models of planet formation.

Citation

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., …Southworth, J. (2013). The GAPS programme with HARPS-N at TNG: II. No giant planets around the metal-poor star HIP 11952⋆⋆⋆. Astronomy & Astrophysics, 554, Article A29. https://doi.org/10.1051/0004-6361/201321155

• Journal Article Type: Article
• Acceptance Date: Feb 6, 2013
• Online Publication Date: May 30, 2013
• Publication Date: 2013-06
• Deposit Date: Jun 16, 2023
• Journal: Astronomy & Astrophysics
• Print ISSN: 0004-6361
• Electronic ISSN: 1432-0746
• Publisher: EDP Sciences
• Peer Reviewed: Peer Reviewed
• Volume: 554
• Article Number: A29
• DOI: https://doi.org/10.1051/0004-6361/201321155
• Keywords: Space and Planetary Science; Astronomy and Astrophysics; stars: individual: HIP 11952; techniques: radial velocities; planetary systems
• Public URL: https://keele-repository.worktribe.com/output/472661