de Leon, JP;
Livingston, JH;
Jenkins, JS;
Vines, JI;
Wittenmyer, RA;
Clark, JT;
Winn, JIM;
... Zhou, G; + view all
(2023)
A sub-Neptune transiting the young field star HD 18599 at 40 pc.
Monthly Notices of the Royal Astronomical Society
, 522
(1)
pp. 750-766.
10.1093/mnras/stad894.
Preview |
PDF
stad894.pdf - Published Version Download (3MB) | Preview |
Abstract
Transiting exoplanets orbiting young nearby stars are ideal laboratories for testing theories of planet formation and evolution. However, to date only a handful of stars with age <1 Gyr have been found to host transiting exoplanets. Here we present the discovery and validation of a sub-Neptune around HD 18599 , a young (300 Myr), nearby (d = 40 pc) K star. We validate the transiting planet candidate as a bona fide planet using data from the TESS , Spitzer , and Gaia missions, ground-based photometry from IRSF , LCO , PEST , and NGTS , speckle imaging from Gemini, and spectroscopy from CHIRON , NRES , FEROS , and Minerva-Australis . The planet has an orbital period of 4.13 d , and a radius of 2.7 R⊕ . The RV data yields a 3-σ mass upper limit of 30.5 M⊕ which is explained by either a massive companion or the large observed jitter typical for a young star. The brightness of the host star (V∼9 mag) makes it conducive to detailed characterization via Doppler mass measurement which will provide a rare view into the interior structure of young planets.
Type: | Article |
---|---|
Title: | A sub-Neptune transiting the young field star HD 18599 at 40 pc |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1093/mnras/stad894 |
Publisher version: | https://doi.org/10.1093/mnras/stad894 |
Language: | English |
Additional information: | This version is the version of record. For information on re-use, please refer to the publisher's terms and conditions. |
Keywords: | techniques: radial velocities, techniques: spectroscopic, planets and satellites: detection, stars: individual: TOI-179 |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
URI: | https://discovery.ucl.ac.uk/id/eprint/10169645 |



1. | ![]() | 4 |
2. | ![]() | 3 |
3. | ![]() | 2 |
4. | ![]() | 1 |
5. | ![]() | 1 |
6. | ![]() | 1 |
Archive Staff Only
![]() |
View Item |