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A mini-Neptune from TESS and CHEOPS around the 120 Myr Old AB Dor Member HIP 94235

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Zhou, George, Wirth, Christopher P., Huang, Chelsea X., Venner, Alexander, Franson, Kyle, Quinn, Samuel N., Bouma, L. G., Kraus, Adam L., Mann, Andrew W., Newton, Elisabeth. R. et al.
(2022) A mini-Neptune from TESS and CHEOPS around the 120 Myr Old AB Dor Member HIP 94235. The Astronomical Journal, 163 (6). 289. doi:10.3847/1538-3881/ac69e3 ISSN 0004-6256.

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Official URL: http://dx.doi.org/10.3847/1538-3881/ac69e3

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Abstract

The Transiting Exoplanet Survey Satellite (TESS) mission has enabled discoveries of the brightest transiting planet systems around young stars. These systems are the benchmarks for testing theories of planetary evolution. We report the discovery of a mini-Neptune transiting a bright star in the AB Doradus moving group. HIP 94235 (TOI-4399, TIC 464646604) is a Vmag = 8.31 G-dwarf hosting a ${3.00}_{-0.28}^{+0.32}\,{R}_{\oplus }$ mini-Neptune in a 7.7 day period orbit. HIP 94235 is part of the AB Doradus moving group, one of the youngest and closest associations. Due to its youth, the host star exhibits significant photometric spot modulation, lithium absorption, and X-ray emission. Three 0.06% transits were observed during Sector 27 of the TESS Extended Mission, though these transit signals are dwarfed by the 2% peak-to-peak photometric variability exhibited by the host star. Follow-up observations with the Characterising Exoplanet Satellite confirmed the transit signal and prevented the erosion of the transit ephemeris. HIP 94235 is part of a 50 au G-M binary system. We make use of diffraction limited observations spanning 11 yr, and astrometric accelerations from Hipparcos and Gaia, to constrain the orbit of HIP 94235 B. HIP 94235 is one of the tightest stellar binaries to host an inner planet. As part of a growing sample of bright, young planet systems, HIP 94235 b is ideal for follow-up transit observations, such as those that investigate the evaporative processes driven by high-energy radiation that may sculpt the valleys and deserts in the Neptune population.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Extrasolar planets , Extrasolar planets -- Detection , Astronomical photometry
Journal or Publication Title: The Astronomical Journal
Publisher: Institute of Physics Publishing, Inc.
ISSN: 0004-6256
Official Date: 24 May 2022
Dates:
DateEvent
24 May 2022Published
22 April 2022Accepted
Volume: 163
Number: 6
Article Number: 289
DOI: 10.3847/1538-3881/ac69e3
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Copyright Holders: © 2022. The Author(s). Published by the American Astronomical Society
Date of first compliant deposit: 15 June 2022
Date of first compliant Open Access: 15 June 2022
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
DE210101893Australian Research Councilhttp://dx.doi.org/10.13039/501100000923
G03007 (TESS)[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
DE200101840Australian Research Councilhttp://dx.doi.org/10.13039/501100000923
Winton Exoplanet FellowshipDavid and Claudia Harding Foundationhttps://www.dchfoundation.net/
GN/S-2021A-LP-105[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
LIEF Grant LE160100001[ARC] Australian Research Councilhttp://dx.doi.org/10.13039/501100000923
Discovery Grants DP180100972 a[ARC] Australian Research Councilhttp://dx.doi.org/10.13039/501100000923
DP220100365[ARC] Australian Research Councilhttp://dx.doi.org/10.13039/501100000923
80NSSC21K0108 (TESS)[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
80NSSC22K0185 (TESS)[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104

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