HD 28109 hosts a trio of transiting Neptunian planets including a near-resonant pair, confirmed by ASTEP from Antarctica Get access Arrow
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Article Title | HD 28109 hosts a trio of transiting Neptunian planets including a near-resonant pair, confirmed by ASTEP from Antarctica Get access Arrow |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Dransfield, Georgina, Triaud, Amaury H M J, Guillot, Tristan, Mekarnia, Djamel, Nesvorny, David, Crouzet, Nicolas, Abe, Lyu, Agabi, Karim, Buttu, Marco, Cabrera, Juan, Gandolfi, Davide, Gunther, Maximilian N, Rodler, Florian, Schmider, Francois-Xavier, Stee, Philippe, Suarez, Olga, Collins, Karen A, Dévora-Pajares, Martín, Howell, Steve B, Matthews, Elisabeth C, Standing, Matthew R, Stassun, Keivan G, Stockdale, Chris, Quinn, Samuel N, Ziegler, Carl, Crossfield, Ian J M, Lissauer, Jack J, Mann, Andrew W, Matson, Rachel, Schlieder, Joshua and Zhou, George |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 515 (1), pp. 1328-1345 |
Number of Pages | 18 |
Year | 2022 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stac1383 |
Web Address (URL) | https://academic.oup.com/mnras/article/515/1/1328/6590833 |
Abstract | We report on the discovery and characterization of three planets orbiting the F8 star HD 28109, which sits comfortably in TESS’s continuous viewing zone. The two outer planets have periods of 56.0067 ± 0.0003d and 84.2597-0.0008+0.0010, which implies a period ratio very close to that of the first-order 3:2 mean motion resonance, exciting transit timing variations (TTVs) of up to 60, min. These two planets were first identified by TESS, and we identified a third planet in the TESS photometry with a period of 22.8911 ± 0.0004d. We confirm the planetary nature of all three planetary candidates using ground-based photometry from Hazelwood, ASTEP, and LCO, including a full detection of the ~9h transit of HD 28109 c from Antarctica. The radii of the three planets are it Rb=2.199-0.10+0.098 R⊕, Rc=4.23± 0.11 R⊕, and Rd=3.25± 0.11R⊕ we characterize their masses using TTVs and precise radial velocities from ESPRESSO and HARPS, and find them to be Mb=18.5-7.6+9.1M⊕, Mc=7.9-3.0+4.2 M⊕, and Md=5.7-2.1+2.7M⊕, making planet b a dense, massive planet while c and d are both underdense. We also demonstrate that the two outer planets are ripe for atmospheric characterization using transmission spectroscopy, especially given their position in the CVZ of James Webb Space Telescope. The data obtained to date are consistent with resonant (librating) and non-resonant (circulating) solutions; additional observations will show whether the pair is actually locked in resonance or just near-resonant. |
Keywords | planets and satellites: detection; planets and satellites: dynamical evolution and stability; planets and satellites: fundamental parameters |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2022 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | University of Birmingham, United Kingdom |
Cote d'Azur University, France | |
Southwest Research Institute, United States | |
European Space Agency, France | |
Leiden University, Netherlands | |
INAF Observatory of Astrophysics and Space Science, Italy | |
German Aerospace Centre, Germany | |
University of Turin, Italy | |
European Southern Observatory (ESO), Chile | |
Center for Astrophysics Harvard and Smithsonian, United States | |
University of Granada, Spain | |
NASA Ames Research Center, United States | |
University of Geneva, Switzerland | |
Vanderbilt University, United States | |
Hazelwood Observatory, Australia | |
Stephen F. Austin State University, United States | |
University of Kansas, United States | |
University of North Carolina, United States | |
United States Naval Observatory, United States | |
NASA Goddard Space Flight Center, United States | |
Centre for Astrophysics |
https://research.usq.edu.au/item/x41wx/hd-28109-hosts-a-trio-of-transiting-neptunian-planets-including-a-near-resonant-pair-confirmed-by-astep-from-antarctica-get-access-arrow
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