The Transiting Multi-planet System HD 3167 : A 5.7 M ⊕ Super-Earth and an 8.3 M ⊕ Mini-Neptune
(2017) In Astronomical Journal 154(3).- 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 ⊕, a radius of 1.574 ±0.054 R ⊕, and a mean density of 8.00... (More)
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 ⊕, a radius of 1.574 ±0.054 R ⊕, and a mean density of 8.00 +1.10 -0.98g cm-3, 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 +1.79-1.85M ⊕ and a radius of 2.740 +0.106 -0.100 R ⊕, yielding a mean density of 2.21+0.56 -0.53g cm-3, 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.
(Less)
- author
- publishing date
- 2017-09
- type
- Contribution to journal
- publication status
- published
- keywords
- planets and satellites: detection, planets and satellites: individual (HD 3167b, HD 3167c), stars: fundamental parameters, stars: individual (HD 3167)
- in
- Astronomical Journal
- volume
- 154
- issue
- 3
- article number
- 123
- publisher
- IOP Publishing
- external identifiers
-
- scopus:85029085750
- ISSN
- 0004-6256
- DOI
- 10.3847/1538-3881/aa832a
- language
- English
- LU publication?
- no
- additional info
- Publisher Copyright: © 2017. The American Astronomical Society. All rights reserved.
- id
- 3f05b6eb-2eb1-4e4c-bea2-5a19610fe3bd
- date added to LUP
- 2023-02-02 12:51:53
- date last changed
- 2023-02-20 16:24:10
@article{3f05b6eb-2eb1-4e4c-bea2-5a19610fe3bd,
abstract = {{<p>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 <sup>+1.10</sup> <sub>-0.98</sub>g cm<sub>-3</sub>, 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 <sup>+1.79</sup><sub>-1.85</sub>M <sub>⊕</sub> and a radius of 2.740 <sup>+0.106</sup> <sub>-0.100</sub> R <sub>⊕</sub>, yielding a mean density of 2.21<sup>+0.56</sup> <sub>-0.53</sub>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.</p>}},
author = {{Gandolfi, Davide and Barragán, Oscar and Hatzes, Artie P. and Fridlund, Malcolm and Fossati, Luca and Donati, Paolo and Johnson, Marshall C. and Nowak, Grzegorz and Prieto-Arranz, Jorge and Albrecht, Simon and Dai, Fei and Deeg, Hans and Endl, Michael and Grziwa, Sascha and Hjorth, Maria and Korth, Judith and Nespral, David and Saario, Joonas and Smith, Alexis M.S. and Antoniciello, Giuliano and Alarcon, Javier and Bedell, Megan and Blay, Pere and Brems, Stefan S. and Cabrera, Juan and Csizmadia, Szilard and Cusano, Felice and Cochran, William D. and Eigmüller, Philipp and Erikson, Anders and González Hernández, Jonay I. and Guenther, Eike W. and Hirano, Teruyuki and Suárez Mascareño, Alejandro and Narita, Norio and Palle, Enric and Parviainen, Hannu and Pätzold, Martin and Persson, Carina M. and Rauer, Heike and Saviane, Ivo and Schmidtobreick, Linda and Van Eylen, Vincent and Winn, Joshua N. and Zakhozhay, Olga V.}},
issn = {{0004-6256}},
keywords = {{planets and satellites: detection; planets and satellites: individual (HD 3167b, HD 3167c); stars: fundamental parameters; stars: individual (HD 3167)}},
language = {{eng}},
number = {{3}},
publisher = {{IOP Publishing}},
series = {{Astronomical Journal}},
title = {{The Transiting Multi-planet System HD 3167 : A 5.7 M <sub>⊕</sub> Super-Earth and an 8.3 M <sub>⊕</sub> Mini-Neptune}},
url = {{http://dx.doi.org/10.3847/1538-3881/aa832a}},
doi = {{10.3847/1538-3881/aa832a}},
volume = {{154}},
year = {{2017}},
}