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A close-in puffy Neptune with hidden friends : the enigma of TOI 620
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(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
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Official URL: http://dx.doi.org/10.3847/1538-3881/ac658b
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 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| 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 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| 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 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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