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Title: | The Transiting Multi-planet System HD 3167: A 5.7 M ⊕ Super-Earth and an 8.3 M ⊕ Mini-Neptune | Authors: | Gandolfi, Davide Barragán, Oscar Hatzes, Artie P. Fridlund, Malcolm Fossati, Luca Donati, Paolo Johnson, Marshall C. Nowak, Grzegorz Prieto-Arranz, Jorge Albrecht, Simon Dai, Fei Deeg, Hans Endl, Michael Grziwa, Sascha Hjorth, Maria Korth, Judith Nespral, David Saario, Joonas Smith, Alexis M. S. Antoniciello, Giuliano Alarcon, Javier Bedell, Megan Blay, Pere Brems, Stefan S. Cabrera, Juan Csizmadia, Szilard CUSANO, FELICE Cochran, William D. Eigmüller, Philipp Erikson, Anders González Hernández, Jonay I. Guenther, Eike W. Hirano, Teruyuki Suárez Mascareño, Alejandro Narita, Norio Palle, Enric Parviainen, Hannu Pätzold, Martin Persson, Carina M. Rauer, Heike Saviane, Ivo Schmidtobreick, Linda Van Eylen, Vincent Winn, Joshua N. Zakhozhay, Olga V. |
Issue Date: | 2017 | Journal: | THE ASTRONOMICAL JOURNAL | Number: | 154 | Issue: | 3 | First Page: | 123 | Abstract: | HD 3167 is a bright (V = 8.9 mag) K0 V star observed by NASA’s K2 space mission during its Campaign 8. It has recently been found to host two small transiting planets, namely, HD 3167b, an ultra-short-period (0.96 days) super-Earth, and HD 3167c, a mini-Neptune on a relatively long-period orbit (29.85 days). Here we present an intensive radial velocity (RV) follow-up of HD 3167 performed with the FIES@NOT, HARPS@ESO-3.6 m, and HARPS-N@TNG spectrographs. We revise the system parameters and determine radii, masses, and densities of the two transiting planets by combining the K2 photometry with our spectroscopic data. With a mass of 5.69 ± 0.44 M <SUB>⊕</SUB>, a radius of 1.574 ± 0.054 R <SUB>⊕</SUB>, and a mean density of {8.00}<SUB>-0.98</SUB><SUP>+1.10</SUP> {{g}} {{cm}}<SUP>-3</SUP>, HD 3167b joins the small group of ultra-short-period planets known to have rocky terrestrial compositions. HD 3167c has a mass of {8.33}<SUB>-1.85</SUB><SUP>+1.79</SUP> M <SUB>⊕</SUB> and a radius of {2.740}<SUB>-0.100</SUB><SUP>+0.106</SUP> R <SUB>⊕</SUB>, yielding a mean density of {2.21}<SUB>-0.53</SUB><SUP>+0.56</SUP> {{g}} {{cm}}<SUP>-3</SUP>, indicative of a planet with a composition comprising a solid core surrounded by a thick atmospheric envelope. The rather large pressure scale height (∼350 km) and the brightness of the host star make HD 3167c an ideal target for atmospheric characterization via transmission spectroscopy across a broad range of wavelengths. We found evidence of additional signals in the RV measurements but the currently available data set does not allow us to draw any firm conclusions on the origin of the observed variation. | URI: | http://hdl.handle.net/20.500.12386/27894 | URL: | https://iopscience.iop.org/article/10.3847/1538-3881/aa832a | ISSN: | 0004-6256 | DOI: | 10.3847/1538-3881/aa832a | Bibcode ADS: | 2017AJ....154..123G | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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Gandolfi_2017_AJ_154_123.pdf | Pdf editoriale | 2.34 MB | Adobe PDF | View/Open |
1706.02532.pdf | 5.27 MB | Adobe PDF | View/Open |
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