A dense mini-Neptune orbiting the bright young star HD 18599
Article
Article Title | A dense mini-Neptune orbiting the bright young star HD 18599 |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Vines, Jose I. (Author), Jenkins, James S. (Author), Berdinas, Zaira (Author), Soto, Maritza G. (Author), Diaz, Matias R. (Author), Alves, Douglas R. (Author), Tuomi, Mikko (Author), Wittenmyer, Robert A. (Author), de Leon, Jerome Pitogo (Author), Pena, Pablo (Author), Lissauer, Jack J. (Author), Ballard, Sarah (Author), Bedding, Timothy (Author), Bowler, Brendan P. (Author), Horner, Jonathan (Author), Jones, Hugh R. A. (Author), Kane, Stephen R. (Author), Kielkopf, John (Author), Plavchan, Peter (Author), Shporer, Avi (Author), Tinney, C. G. (Author), Zhang, Hui (Author), Wright, Duncan J. (Author), Addison, Brett (Author), Mengel, Matthew W. (Author), Okumura, Jack (Author) and Samadi-Ghadim, Anya (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 518 (2), p. 2627–2639 |
Number of Pages | 14 |
Year | 2023 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stac2845 |
Web Address (URL) | https://academic.oup.com/mnras/article/518/2/2627/6760009 |
Abstract | Very little is known about the young planet population because the detection of small planets orbiting young stars is obscured by the effects of stellar activity and fast rotation which mask planets within radial velocity and transit data sets. The few planets that have been discovered in young clusters generally orbit stars too faint for any detailed follow-up analysis. Here we present the characterization of a new mini-Neptune planet orbiting the bright (V=9) and nearby K2 dwarf star, HD 18599. The planet candidate was originally detected in TESS light curves from Sectors 2, 3, 29, and 30, with an orbital period of 4.138 days. We then used HARPS and FEROS radial velocities, to find the companion mass to be 25.5±4.6 M⊕. When we combine this with the measured radius from TESS of 2.70±0.05 R⊕, we find a high planetary density of 7.1±1.4 g cm−3. The planet exists on the edge of the Neptune Desert and is the first young planet (300 Myr) of its type to inhabit this region. Structure models argue for a bulk composition to consist of 23 per cent H2O and 77 per cent Rock and Iron. Future follow-up with large ground- and space-based telescopes can enable us to begin to understand in detail the characteristics of young Neptunes in the galaxy. |
Keywords | stars: individual: HD 18599; Planetary Systems; techniques: radial; velocities; techniques: photometric; stars: activity; Astrophysics - Earth and Planetary Astrophysics |
Contains Sensitive Content | Does not contain sensitive content |
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 ©: 2023 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | University of Chile, Chile |
Diego Portales University, Chile | |
Queen Mary University of London, United Kingdom | |
University of Helsinki, Finland | |
Centre for Astrophysics | |
University of Tokyo, Japan | |
NASA Ames Research Center, United States | |
University of Florida, United States | |
University of Sydney | |
University of Texas at Austin, United States | |
University of Hertfordshire, United Kingdom | |
University of California, United States | |
University of Louisville, United States | |
George Mason University, United States | |
Massachusetts Institute of Technology, United States | |
University of New South Wales | |
Nanjing University, China | |
Max Planck Society, Germany | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q7x0z/a-dense-mini-neptune-orbiting-the-bright-young-star-hd-18599
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