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The GAPS Programme with HARPS-N at TNG. XVIII. Two new giant planets around the metal-poor stars HD 220197 and HD 233832

MPS-Authors

Barbato,  D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sozzetti,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Biazzo,  K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Malavolta,  L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Santos,  N. C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Damasso,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lanza,  A. F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pinamonti,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Affer,  L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Benatti,  S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bignamini,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bonomo,  A. S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Borsa,  F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Carleo,  I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Claudi,  R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cosentino,  R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Covino,  E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Desidera,  S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Esposito,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Giacobbe,  P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

González-Álvarez,  E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gratton,  R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Harutyunyan,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Leto,  G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Maggio,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Maldonado,  J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mancini,  L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Masiero,  S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Micela,  G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Molinari,  E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nascimbeni,  V.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pagano,  I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Piotto,  G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Poretti,  E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rainer,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Scandariato,  G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Smareglia,  R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Colombo,  L. S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Di Fabrizio,  L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Faria,  J. P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Martinez Fiorenzano,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Molinaro,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pedani,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2019A&A...621A.110B
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Citation

Barbato, D., Sozzetti, A., Biazzo, K., Malavolta, L., Santos, N. C., Damasso, M., et al. (2019). The GAPS Programme with HARPS-N at TNG. XVIII. Two new giant planets around the metal-poor stars HD 220197 and HD 233832. Astronomy and Astrophysics, 621.


Cite as: https://hdl.handle.net/21.11116/0000-0005-D42D-A
Abstract
Context. Statistical studies of exoplanets have shown that giant planets are more commonly hosted by metal-rich dwarf stars than low-metallicity stars, while no such correlation is evident for lower mass planets. The search for giant planets around metal-poor stars and the estimate of their occurrence fp is an important element in providing support to models of planet formation.
Aims: We present results from the HARPS-N search for giant planets orbiting metal-poor (- 1.0 ≤[Fe/H] ≤-0.5 dex) stars in the northern hemisphere, complementing a previous HARPS survey on southern stars in order to update the estimate of fp.
Methods: High-precision HARPS-N observations of 42 metal-poor stars were used to search for planetary signals to be fitted using differential evolution Markov chain Monte Carlo single- Keplerian models. We then joined our detections to the results of the previous HARPS survey on 88 metal-poor stars to provide a preliminary estimate of the two-hemisphere fp.
Results: We report the detection of two new giant planets around HD 220197 and HD 233832. The first companion has Msin i = 0.20-0.04+0.07 MJup and an orbital period of 1728-80+162 days, and for the second companion, we find two solutions of equal statistical weight with periods of 2058-40+47 and 4047-117+91 days and minimum masses of 1.78-0.06+0.08 and 2.72-0.23+0.23 MJup, respectively. Joining our two detections with the three from the southern survey, we obtain a preliminary and conservative estimate of the global frequency of fp = 3.84 -1.06+2.45% for giant planets around metal-poor stars.
Conclusions: The two new giant planets orbit dwarf stars at the metal-rich end of the HARPS-N metal- poor sample. This corroborates previous results that suggested that giant planet frequency is still a rising function of the host star [Fe/H]. We also note that all detections in the overall sample are giant long-period planets. Based on observations made with the HARPS-N spectrograph on the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma (Spain) by the INAF - Fundación Galileo Galilei (Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias).RV data (Table 5) are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz- bin/qcat?J/A+A/621/A110">http://cdsarc.u-strasbg.fr/viz- bin/qcat?J/A+A/621/A110</A>