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A dense mini-Neptune orbiting the bright young star HD 18599
Authors
Brett Addison
Douglas R. Alves
+23 more
Sarah Ballard
Timothy Bedding
Zaira Berdiñas
Brendan P. Bowler
Matías R. Díaz
Jonathan Horner
James S. Jenkins
Hugh R. A. Jones
John Kielkopf
Jerome Pitogo de Leon
Jack J. Lissauer
Matthew W. Mengel
Jack Okumura
Pablo Peña
Peter Plavchan
Anya Samadi-Ghadim
Avi Shporer
Maritza G. Soto
C. G. Tinney
Mikko Tuomi
Jose I. Vines
Robert A. Wittenmyer
Hui Zhang Duncan J. Wright
Publication date
13 October 2022
Publisher
'Oxford University Press (OUP)'
Doi
Cite
Abstract
© 2022 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.1093/mnras/stac2845Very 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
±
\pm
±
4.6~M
⊕
_\oplus
⊕
. When we combine this with the measured radius from TESS, of 2.70
±
\pm
±
0.05~R
⊕
_\oplus
⊕
, we find a high planetary density of 7.1
±
\pm
±
1.4~g cm
−
3
^{-3}
−
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% H
2
_2
2
O and 77% 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.Peer reviewe
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Last time updated on 02/12/2022