Skip to content Skip to navigation
University of Warwick
  • Study
  • |
  • Research
  • |
  • Business
  • |
  • Alumni
  • |
  • News
  • |
  • About

University of Warwick
Publications service & WRAP

Highlight your research

  • WRAP
    • Home
    • Search WRAP
    • Browse by Warwick Author
    • Browse WRAP by Year
    • Browse WRAP by Subject
    • Browse WRAP by Department
    • Browse WRAP by Funder
    • Browse Theses by Department
  • Publications Service
    • Home
    • Search Publications Service
    • Browse by Warwick Author
    • Browse Publications service by Year
    • Browse Publications service by Subject
    • Browse Publications service by Department
    • Browse Publications service by Funder
  • Help & Advice
University of Warwick

The Library

  • Login
  • Admin

A close-in puffy Neptune with hidden friends : the enigma of TOI 620

Tools
- Tools
+ Tools

Reefe, Michael A., Luque, Rafael, Gaidos, Eric, Beard, Corey, Plavchan, Peter P., Cointepas, Marion, Cale, Bryson L., Palle, Enric, Parviainen, Hannu, Feliz, Dax L. et al.
(2022) A close-in puffy Neptune with hidden friends : the enigma of TOI 620. The Astronomical Journal, 163 (6). 269. doi:10.3847/1538-3881/ac658b ISSN 0004-6256.

[img]
Preview
PDF
WRAP-A-close-in-puffy-Neptune-with-hidden-friends-the-enigma-of-TOI-620-Bryant-22.pdf - Published Version - Requires a PDF viewer.
Available under License Creative Commons Attribution 4.0.

Download (8Mb) | Preview
Official URL: http://dx.doi.org/10.3847/1538-3881/ac658b

Request Changes to record.

Abstract

We present the validation of a transiting low-density exoplanet orbiting the M2.5 dwarf TOI 620 discovered by the NASA Transiting Exoplanet Survey Satellite (TESS) mission. We utilize photometric data from both TESS and ground-based follow-up observations to validate the ephemerides of the 5.09 day transiting signal and vet false-positive scenarios. High-contrast imaging data are used to resolve the stellar host and exclude stellar companions at separations ≳0farcs2. We obtain follow-up spectroscopy and corresponding precise radial velocities (RVs) with multiple precision radial velocity (PRV) spectrographs to confirm the planetary nature of the transiting exoplanet. We calculate a 5σ upper limit of MP < 7.1 M⊕ and ρP < 0.74 g cm−3, and we identify a nontransiting 17.7 day candidate. We also find evidence for a substellar (1–20 MJ) companion with a projected separation ≲20 au from a combined analysis of Gaia, adaptive optics imaging, and RVs. With the discovery of this outer companion, we carry out a detailed exploration of the possibilities that TOI 620 b might instead be a circum-secondary planet or a pair of eclipsing binary stars orbiting the host in a hierarchical triple system. We find, under scrutiny, that we can exclude both of these scenarios from the multiwavelength transit photometry, thus validating TOI 620 b as a low-density exoplanet transiting the central star in this system. The low density of TOI 620 b makes it one of the most amenable exoplanets for atmospheric characterization, such as with the James Webb Space Telescope and Ariel, validated or confirmed by the TESS mission to date.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Infrared astronomy , Space interferometry, 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: 16 April 2022
Dates:
DateEvent
16 April 2022Published
6 April 2022Accepted
16 May 2022Submitted
Volume: 163
Number: 6
Number of Pages: 52
Article Number: 269
DOI: 10.3847/1538-3881/ac658b
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 11 July 2022
Date of first compliant Open Access: 12 July 2022
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
80NSSC20K0251[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
80NSSC21K0349[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
1716202[NSF] National Science Foundation (US)http://dx.doi.org/10.13039/100000001
2006517[NSF] National Science Foundation (US)http://dx.doi.org/10.13039/100000001
UNSPECIFIEDMt. Cuba Astronomical Foundationhttp://dx.doi.org/10.13039/100014125
PID2019-109522GB-C52Ministerio de Ciencia e Innovaciónhttp://dx.doi.org/10.13039/501100004837
SEV-2017-0709Instituto de Astrofísica de Andalucíahttp://viaf.org/viaf/132190334
P17H04574[JSPS] Japan Society for the Promotion of Sciencehttp://dx.doi.org/10.13039/501100001691
JP18H05439[JSPS] Japan Society for the Promotion of Sciencehttp://dx.doi.org/10.13039/501100001691
JP20K14518[JSPS] Japan Society for the Promotion of Sciencehttp://dx.doi.org/10.13039/501100001691
JP21K13975[JSPS] Japan Society for the Promotion of Sciencehttp://dx.doi.org/10.13039/501100001691
JPMJCR1761 (CREST)Japan Science and Technology Agencyhttp://dx.doi.org/10.13039/501100002241
AB022006National Institutes of Natural Scienceshttp://dx.doi.org/10.13039/501100006321
AB031010National Institutes of Natural Scienceshttp://dx.doi.org/10.13039/501100006321
AB031014National Institutes of Natural Scienceshttp://dx.doi.org/10.13039/501100006321
PGC2018-098153-B-C31[MINECO] Ministerio de Economía y Competitividadhttp://dx.doi.org/10.13039/501100003329
NNX17AF81G[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
PCEFP2_194576[SNSF] Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschunghttp://dx.doi.org/10.13039/501100001711
80NSSC18K1114[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
1547612[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
AST-190950[NSF] National Science Foundation (US)http://dx.doi.org/10.13039/100000001
1910954[NSF] National Science Foundation (US)http://dx.doi.org/10.13039/100000001

Request changes or add full text files to a record

Repository staff actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics

twitter

Email us: wrap@warwick.ac.uk
Contact Details
About Us